Journal articles: 'Asphalt cement'

1

Al-Jumaili, Mohammed Abbas, and Hamid Athab Al-Jameel. "Predicting a Model for Modified Asphalt Cement Rutting Parameters." Key Engineering Materials 895 (August 3, 2021): 1–11. http://dx.doi.org/10.4028/www.scientific.net/kem.895.1.

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This paper aims to investigate the relationship between the Superpave rutting parameter of asphalt (G﹡/sin δ) by conducting Dynamic Shear Rheometer (DSR) tests with the rut depth values obtained by the wheel track device. The twenty asphalt mixtures have been prepared with twenty types of unmodified asphalts and Polymer-Modified Binders (PMBs). SBS was used to produce PMBs. The twenty base and modified asphalts have been used to prepare asphalt paving mixtures required to conduct wheel track tests. The predicted model of asphalt mixtures rut depth related to asphalt rutting parameter (G﹡/sin δ) values has been founded. Besides, the minimum limits of (G﹡/sin δ) of aged asphalt have been gotten as 3.25 kPa for Iraqi asphalt cement.

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Zhang, Yun Hua, and Fa Zhou Wang. "Effect of Emulsified Asphalt on Temperature Susceptibility of Cement Asphalt Mortar." Advanced Materials Research 335-336 (September 2011): 124–27. http://dx.doi.org/10.4028/www.scientific.net/amr.335-336.124.

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Cement asphalt mortar (CA mortar, or CAM) is a composite material with equal presence of cement and asphalt emulsion and acts as a cushion layer in the structure of slab track. In the hardened matrix, asphalt accounts for about 30 vol. %, rendering the properties of CA mortar susceptible to temperature variation. In the paper, different kinds of emulsified asphalts (A70 emulsified asphalt, A90 emulsified asphalt, SBS modified emulsified asphalt and SBR modified emulsified asphalt) for CA mortar and the compressive strengths of CA mortar under different temperatures (-18°C, 10°C, 25°C, 40°C and 60°C) were studied to reflect its thermal dependence. Results indicate that temperature susceptibility of CA mortar prepared with modified emulsified asphalt is better than which prepared with unmodified emulsified asphalt. SBS modified emulsified asphalt -CAM (viz. CA mortar prepared by SBS modified emulsified asphalt) is alleviated at the whole temperature range, while that of SBR modified emulsified asphalt -CAM is improved primarily at the lower temperature region. As for types of unmodified asphalts, A90 emulsified asphalt -CAM outperforms A70 emulsified asphalt -CAM at lower temperature range.

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Delgado Jojoa, Miguel Gerardo, Hugo Alexander Rondón Quintana, Jessica Alexandra Sánchez Gilede, Wilmar Darío Fernández Gómez, and Fredy Alberto Reyes Lizcano. "Influence of four non-conventional additives on the physical, rheological and thermal properties of an asphalt." Ingeniería e Investigación 38, no. 2 (May 1, 2018): 18–26. http://dx.doi.org/10.15446/ing.investig.v38n2.68638.

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This article shows the evaluation of the influence of two polymer wastes (crumb rubber – GCR and low density polyethylene – LDPE), a natural bitumen (Gilsonite - G) and a chemical component (Husil) about the physical, rheological and thermal properties of an asphalt cement (AC 60/70 penetration grade). Over a control asphalt and the modified asphalts were performed: penetration, softening point, ductility, ignition point, rheology (using a dynamic cut rheometer – DSR), Multi Stress Creep and Recovery (MSCR), linear amplitude sweep (LAS), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) tests. The results show that fourth additives increase the stiffness and rutting resistance of the asphalts. Additionally, it reports an increase in fatigue cracking resistance when asphalt cement is modified with GCR, G and Husil. The additives give thermal stability to the asphalt cement, providing less mass loss (linked mostly to a less oxidation).

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Chen, Jian Hua, Gui Lian Zou, Xiao Ning Zhang, Shun Xian Zhang, Wen Nie, and Tao Tao Wan. "Study on the Thixotropic Properties of Mastic Asphalt." Advanced Materials Research 779-780 (September 2013): 356–62. http://dx.doi.org/10.4028/www.scientific.net/amr.779-780.356.

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The asphaltic cement and mastic asphalt are respectively carried on Brookfield rotary viscometer and Lueer tester. The results show that: the thixotropic properties of mastic asphalt lags behind the asphaltic cement; as the stirring temperature is high, the thixotropic effect of mastic asphalt is not obvious, but the construction time range is large. With high stirring speed, the thixotropic effect of mastic asphalt is obvious, but the construction time range is small. The thixotropic effects of mastic asphalt are also analyzed to provide reference for the improvement of the construction process and quality of the construction.

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5

Li, Jun Xiao, Xiao Bo Yin, Jian Yuan, He Chao Zang, and Zong Rui Hao. "Performance of Emulsified Asphalt Full Thickness Cold Recycling Subgrade Materials." Advanced Materials Research 915-916 (April 2014): 704–8. http://dx.doi.org/10.4028/www.scientific.net/amr.915-916.704.

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Full thickness cold recycling subgrade materials were prepared by cement-emulsified asphalt solidified RAP and stabilized soil.The effect of adding amount of emulsified asphalts change on unconfined compressive strength, indirect tensile strength and water stability of cold recycled mixtures with different ratios was studied,and the mechanism of action of cement and emulsified asphalt in the mixtures was analysised via microscopic test. The results show that a proper addition of emulsified asphalt can improve the performance of cold recycled mixtures and the best emulsified asphalt mixing content is 3%. Microscopic test indicate that the cement hydration products space network structure interfinger with the emulsified asphalt network structure, so the cold recycled mixture tightly coupled to a semi-rigid whole, and the mixtures strength can form and develop.

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6

Li, Junxiao, Wei Fu, and Hechao Zang. "Design Method for Proportion of Cement-Foamed Asphalt Cold Recycled Mixture." MATEC Web of Conferences 142 (2018): 02002. http://dx.doi.org/10.1051/matecconf/201814202002.

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Through foaming experiment of Zhongtai AH-70 asphalt, the best foaming temperature water consumption and influence factors of foamed asphalt’s foaming features are determined; By designing the proportion of foamed asphalt cold in-place recycled mixture combined with the water stability experiment, for this mixture the best foamed asphalt addition is 3%, and proportion of the mixture is RAP: fine aggregate: cement=75:23:2. Using SEM technology, the mechanism of increasing on the intensity of foamed asphalt mixture resulted by the addition of cement was analysed. This research provides reference for cement admixture’s formulation in the designing of foamed asphalt cold in-place recycled mixture.

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7

Kuemmel, David A., John R. Jaeckel, Alexander Satanovsky, Stephen F. Shober, and Mitzi M. Dobersek. "Noise Characteristics of Pavement Surface Texture in Wisconsin." Transportation Research Record: Journal of the Transportation Research Board 1544, no. 1 (January 1996): 24–35. http://dx.doi.org/10.1177/0361198196154400104.

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Twelve portland cement concrete pavement (PCCP) test sections were constructed to compare with standard PCCP and asphaltic concrete pavement (ACP) to quantify the effects of the pavement surface texture on noise, safety, and winter maintenance. Asphalt pavements studied included a Strategic Highway Research Program asphalt, stone matrix asphalt (SMA), and Wisconsin standard asphalt. A dependency between the pavement textures and their noise characteristics was observed. Noise measurements indicated that uniformly transverse tined PCCP created dominant noise frequencies that were audible adjacent to the road and inside the test vehicles. Careful design and construction of transversely tined PCCP can reduce tire-road noise. No significant acoustical advantages of open-graded asphalts over the standard dense asphalt were found. The results of this research are preliminary and have not yet been approved by the Wisconsin Department of Transportation Council on Research.

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8

Berthelot, Curtis, Diana Podborochynski, Colin Wandzura, Colin Prang, and Brent Marjerison. "Triaxial frequency sweep characterization of Saskatchewan hot mix asphaltic concrete across asphalt cement binder type." Canadian Journal of Civil Engineering 36, no. 9 (September 2009): 1403–10. http://dx.doi.org/10.1139/l09-066.

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The purpose of this research was to determine how asphalt cement binder types influence the mechanical behaviour of hot mix asphalt concrete mixes. This research employed triaxial frequency sweep characterization of a typical City of Saskatoon Hot Mix Type A2 and a typical Saskatchewan Ministry of Highways and Infrastructure Hot Mix Type 70 across a range of triaxial load frequencies and stress states representative of Saskatchewan field state conditions. The asphaltic mixes were evaluated across four asphalt cement binder types typically employed by Saskatchewan road agencies. Based on the findings of this study, the mechanical behaviour of both asphalt mixes evaluated were found to be highly sensitive to load rate, stress state, as well as asphaltic binder type. It was concluded that load rate, field stress state, and asphalt binder type should be incorporated into the structural design of hot mix asphalt concrete pavements to ensure adequate mix performance, particularly when placed in severe field conditions.

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9

Hu, Ganghua, Qing Yang, Xin Qiu, Huiqiong Liu, Yanfeng Qian, and Shanglin Xiao. "Assessment of Interaction Behaviors of Cement-Emulsified Asphalt Based on Micro-Morphological and Macro-Rheological Approaches." Materials 15, no. 3 (January 29, 2022): 1070. http://dx.doi.org/10.3390/ma15031070.

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Cement emulsified asphalt composite binder (CEACB) plays a determining role in the construction of cold recycled asphalt pavements. Understanding the interaction behaviors of cement-emulsified asphalt is very essential to promote the serviceability of CEACB. The objective of this study was to explore the interaction behaviors and mechanism of cement-emulsified asphalt associated with microstructural characteristics and to assess the interaction ability of cement-emulsified asphalt by performing macro-rheological measurements. Firstly, the physico-chemical interaction of cement-emulsified asphalt was qualitatively discussed by analyzing the difference of characteristic peaks based on Fourier transform infrared (FTIR) spectrometer. Secondly, the micro-morphological evolution behaviors of CEACB attributing to the cement-emulsified asphalt interaction were investigated by using a fluorescence microscope (FM) and laser particle size analyzer (LPSA). Thirdly, the microstructural characteristics of CEACB were studied by observing the spatial network structure through the scanning electron microscopy (SEM). Finally, the macro-rheological index based on dynamic rheological shear (DSR) test was proposed to evaluate the interaction ability of cement-emulsified asphalt. The results show that the cement-emulsified asphalt interaction is merely a physical blending process due to the occurrence of no new characteristic peaks in the FTIR spectrum except for cement hydration products. The cement-emulsified asphalt interaction in early-age CEACB could be reflected by the aggregation process among asphalt droplets and the adsorption action of cement particles to asphalt droplets. A reasonable ratio of cement to emulsified asphalt could promote the formation of the denser spatial network structure of CEACB along with cement hydration products growing and interweaving with asphalt films. The K-B-G* index based on macro-rheological properties of CEACB with full consideration of cement hydration process is very suitable for evaluating the interaction ability of cement-emulsified asphalt under the condition of different cement proportions and curing time. The research would provide the support for understanding the natural properties of CEACB and promote the improvement of the mechanical performance of cold recycled asphalt pavements.

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10

Ma, Tao, Hao Wang, Yongli Zhao, Xiaoming Huang, and Yuhui Pi. "Strength Mechanism and Influence Factors for Cold Recycled Asphalt Mixture." Advances in Materials Science and Engineering 2015 (2015): 1–10. http://dx.doi.org/10.1155/2015/181853.

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This study focused on the key factors affecting the tensile strength of cold recycled asphalt mixture with cement and emulsified asphalt. The specific surface areas and strength of RAP were analyzed. The interaction between the emulsified asphalt and cement was observed. Comprehensive laboratory testing was conducted to evaluate the influences of RAP, emulsified asphalt, and cement on the tensile strength of cold recycled asphalt mixture. It is found that although RAP is used as aggregates, its inner structure and strength are much different from real aggregates. The strength of RAP has decisive effect on the strength of cold recycled asphalt mixture. New aggregates and fine gradation design can help improve the bonding between RAP and binder. For emulsified asphalt, slow setting of asphalt can give sufficient time for cement to hydrate which is helpful for strength formation in the cold recycled asphalt mixture. The high viscosity of asphalt can improve the early strength of cold recycled asphalt mixture that is important for traffic opening in the field. Cement is an efficient additive to improve the strength of cold recycled asphalt mixtures by promoting demulsification of emulsified asphalt and producing cement hydrates. However, the cement content is limited by RAP.

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11

Hu, S. G., T. Wang, F. Z. Wang, and Z. C. Liu. "Adsorption behaviour between cement and asphalt emulsion in cement–asphalt mortar." Advances in Cement Research 21, no. 1 (January 2009): 11–14. http://dx.doi.org/10.1680/adcr.2007.00034.

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12

Fang, Xing Long, Zhi Ming Chen, Zhen Jiao, Gang Hua Pan, Wen Ping Zhou, and Kai Feng. "Prepartion and Atypical Mechianical Performance of Epoxy Asphalt Cement Mortars Composite Material for High Speed Railway." Applied Mechanics and Materials 90-93 (September 2011): 547–53. http://dx.doi.org/10.4028/www.scientific.net/amm.90-93.547.

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Cement asphalt mortar is a key part of flexible adjusting layer in slab ballastless track structure. In this paper, new materials of epoxy asphalt cement mortar (EACM) was prepared with epoxy and chemically modified asphalt emulsionwhich showed excellent in terms of durability and weather resistance. This paper through changing the proportions of the eopxy-asphalt cement ration studies the relationship among fluidity, compressive strength, and elastic modulus of EACM and cement asphalt mortar (CAM) use chemical modification of asphalt emulsion and normal asphalt emulsion. The results showed that chemically modified epoxy asphalt emulsion cement mortar turned out to be relatively better in compressive strength, frost resistance and weather ability compared with CAM. The chemical reaction mechanism of epoxy asphalt emulsion were investigated by the means of environmental scanning electron microscope (ESEM) method.

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13

Wang, Zhen Jun, Qiong Wang, and Guang Ying Yang. "Mechanism Analyses of Structure Formation of Cement Asphalt Emulsion Mixtures." Advanced Materials Research 374-377 (October 2011): 799–802. http://dx.doi.org/10.4028/www.scientific.net/amr.374-377.799.

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Combing with the concept of soft matter and demulsification mechanism of cationic asphalt emulsion, the authors analyzed mechanism of structure formation of cement asphalt emulsion mixtures; thought that minor dosages of cement make properties of asphalt emulsion concrete be changed greatly, and structure of the mixtures mainly results from structure of asphalt emulsion concrete and solid net structure made from asphalt emulsion particles and cement particles; put forward four functions of cement in structure formation of the mixtures, and discussed influence rules of two kinds of binding materials, cement and asphalt emulsion, on structure formation of the mixtures.

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14

Chu, Hao, Jun Zhang, and Yan Hua Lu. "Experimental Study on Pavement Performance of Emulsified Asphalt Cement Concrete." Applied Mechanics and Materials 357-360 (August 2013): 888–92. http://dx.doi.org/10.4028/www.scientific.net/amm.357-360.888.

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Based on the research and indoor experiments, this paper investigates the mixing and curing techniques, pavement performance, and influencing factors of emulsified asphalt cement concrete. The results indicate that mixing sequence of raw material and curing condition have great impact on the strength of the mixture. Adding cement to mixture can improve the pavement performance of mixture greatly. However, increasing the content of emulsified asphalt has opposite effect. Proper content of emulsified asphalt will ensure the bonding strength and waterproof property of the mixture. The critical factors that influence the pavement performance of emulsified asphalt cement concrete are asphalt cement ratio, water cement ratio, content of emulsified asphalt and cement, sand percentage, and aggregate gradation.

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15

Stewart, J. A., and M. Van Aerde. "Material selection and mix design considerations for constructing asphaltic roads and runways in Canada's north." Canadian Journal of Civil Engineering 18, no. 3 (June 1, 1991): 407–15. http://dx.doi.org/10.1139/l91-051.

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The design of practical asphaltic roads and runways in Canada's north is very difficult due to the harsh environmental conditions under which the material needs to be placed in the field, the severe temperature loads to which the pavement is exposed, and the difficulty and (or) cost of obtaining appropriate materials. This paper summarizes the current state-of-the-art in terms of the selection of materials and the design of mixes for the construction of asphaltic pavements in Arctic and sub-Arctic climates. It is shown that the temperature susceptibility of the asphalt cement, the curing rate of cutback liquid asphalts, and the transport of asphalt emulsions at low temperatures are the main problems associated with selecting a binder material. Emulsions appear to be the best suited for use in cold climates, but there is little experience with their use in the far north. In addition, it is indicated neither standard nor the modified Marshall nor the Hveem tests provide ideal tests for selecting the optimum binder content, the degree of curing, the required aerating, or the amount of mixing water for designing asphalt mixes. Key words: asphalt pavements, northern roads, mix design, material selection.

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16

Kandil, K., A. O. Abd El Halim, Y. Hassan, and A. Mostafa. "Investigation of the effects of different polymer-modified asphalt cements on asphalt mixes at low temperature." Canadian Journal of Civil Engineering 34, no. 5 (May 1, 2007): 589–97. http://dx.doi.org/10.1139/l06-152.

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The extreme environmental conditions in Canada require the use of asphalt cement that can provide a high resistance to low-temperature cracking during the winter season and a high resistance to rutting due to the elevated temperatures in the summer. Earlier studies showed that such desired improvements in the quality of asphalt cement could be achieved using polymer-modified asphalt (PMA) cement. This paper presents a three-phase experimental program that was carried out to evaluate the expected performance of asphalt concrete mixtures with PMA compared to asphalt concrete mixtures with conventional and air-oxidized asphalt binders. The results of this study show that PMA in asphalt concrete mixes would significantly improve the resistance to cracking (loading and low-temperature). Key words: asphalt mixtures, polymer-modified asphalt, conventional asphalt cement, air-oxidized asphalt, testing.

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17

Kuo, Ming Feng, Cheng Tsung Lu, Jia Chong Du, and Yu Kai Chen. "Workability of Fresh Cement-Asphalt Mastic." Applied Mechanics and Materials 368-370 (August 2013): 1027–30. http://dx.doi.org/10.4028/www.scientific.net/amm.368-370.1027.

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The Cement-Asphalt Mastic (CAM) is combined with emulsified asphalt and cement. It can mix at room temperature manufacturing and construction without heating. This study investigated viscosity, slump, setting time and segregation of fresh Cement-Asphalt Mastic (CAM). These properties help control the quality of Cement-Asphalt Concrete (CAC). Viscosity and slump are associated with CAC workability and segregation of mastic is related to that quality of fresh CAC. Analytical results of these property tests establish an applicable range for cement and emulsified asphalt (C/A) in CAM at 1-1.2. The applicable range for F-type Superplasticizer (FSP) and emulsified asphalt (FSP/A) is 0.03-0.05.

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18

Ismael, Saif Al-din Majid, and Mohammed Qadir Ismael. "Moisture Susceptibility of Asphalt Concrete Pavement Modified by Nanoclay Additive." Civil Engineering Journal 5, no. 12 (December 3, 2019): 2535–53. http://dx.doi.org/10.28991/cej-2019-03091431.

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Durability of hot mix asphalt (HMA) against moisture damage is mostly related to asphalt-aggregate adhesion. The objective of this work is to find the effect of nanoclay with montmorillonite (MMT) on Marshall properties and moisture susceptibility of asphalt mixture. Two types of asphalt cement, AC(40-50) and AC(60-70) were modified with 2%, 4% and 6% of Iraqi nanoclay with montmorillonite. The Marshall properties, Tensile strength ratio(TSR) and Index of retained strength(ISR) were determined in this work. The total number of specimens was 216 and the optimum asphalt content was 4.91% and 5% for asphalt cement (40-50) and (60-70) respectively. The results showed that the modification of asphalt cement with MMT led to increase Marshall stability and the addition of 6% of MMT recorded the highest increase, where it increased by 26.35% and 22.26% foe asphalt cement(40-5) and(60-70) respectively. Also, the addition of MMT led to increase moisture resistance of asphalt mixture according to the increase in TSR and IRS. The addition of 4% and 6% of MMT recorded the highest increase in TSR and IRS for asphalt cement (40-50) and (60-70) respectively, where they increased by 11.8% and 17.5% respectively for asphalt cement (40-50) and by 10% and 18% respectively for asphalt cement (60-70).

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19

Pi, Yuhui, Yan Li, Yingxing Pi, Zhe Huang, and Zhe Li. "Strength and Micro-Mechanism Analysis of Cement-Emulsified Asphalt Cold Recycled Mixture." Materials 13, no. 1 (December 27, 2019): 128. http://dx.doi.org/10.3390/ma13010128.

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The strength of EACRM (emulsified asphalt cold recycled mixture) is closely related to the properties and proportion of raw materials. In this paper, the strength formation mechanism of EACRM was first studied through microscopic analysis, and the influence regular of aggregate gradation, emulsified asphalt, water consumption, cement consumption, and other factors on its strength was analyzed through a series of laboratory tests. The analysis results show that the asphalt binder plays the role of cementing material in cement emulsified asphalt mortar. The combination of cement and emulsified asphalt is a physical combination. The hydration product not only increases the viscosity of asphalt cement, but also makes the surface of asphalt cement become uneven, which increases the adhesion area with the aggregate. Therefore, the microstructure of the interface between mortar and aggregate is improved. The bonding force of the interface and the mechanical properties of concrete are improved. Due to the influence of recycled asphalt pavement (RAP) materials, the excessive amount of emulsified asphalt and cement are not conducive to improve the strength of cold recycled mixture. Through experiments, the optimal amount of emulsified asphalt and cement is determined as 2.9% and 1.5%, respectively, for the RAP materials. At the same time, improving the performance of emulsified asphalt and adding quicklime and organic activator are also helpful to improve the strength of a cold recycled mixture.

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Qin, Yu, Jun Fu, and Xin Pan. "Numerical Analysis of Micro-Mechanics on Emulsified-Asphalt Cement Concrete." Advanced Materials Research 598 (November 2012): 531–34. http://dx.doi.org/10.4028/www.scientific.net/amr.598.531.

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Emulsified asphalt cement concrete (EACC) has good crack resistance and durability. The influence about the cracking strength of the aggregate shape and the material parameters matching of emulsified asphalt cement concrete were analyzed in this paper through a two-dimensional finite element model built by ANSYS. The circular, square and mixed aggregate had been taken into consideration and the elastic modulus and the Poisson's ratio of the emulsified asphalt cement were changed by 80%, 90%, 100%, 110% and 120% for matching. The results show that selecting the square aggregate can effectively increase the safety reserve of tensile strength of emulsified asphalt cement concrete and the most suitable elastic modulus of emulsified asphalt cement is 25.2GPa and the Poisson's ratio is 0.18, which provides theoretical data for systematic research on emulsified asphalt cement concrete.

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21

Khalaf, Duaa A., Zaynab I. Qasim, and Karim H. Al Helo. "Effect of Modified Asphalt Cement of the Performance of Stone Matrix Mixtures." Engineering and Technology Journal 38, no. 5A (May 25, 2020): 789–800. http://dx.doi.org/10.30684/etj.v38i5a.489.

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This research investigates the behavior of Stone Matrix Asphalt mixtures (SMA) modified with styrene-butadiene-styrene (SBS) polymer at four percentages (1, 2, 3 and 4%) by weight of asphalt cement. The moisture susceptibility and rutting were taken into consideration in this study. To achieve the objective of this research the superpave system is conducted to design the asphalt mixtures. The physical properties of aggregate, bitumen and other mix materials were assessed and evaluated with the laboratory tests. The mixtures were prepared using penetration Graded (40-50) bitumen and a chemical named Polypropylene Fibers was used as a stabilizing additive. Fibers have been used in SMA mixtures for two main reasons: To increase the toughness and fracture resistance of hot mix asphalt (HMA) and to act as a stabilizer to prevent drain down of the asphalt binder. The laboratory tests include indirect tensile strength test, Marshall stability and retained Marshall Stability test (RMS). For rutting test the Roller wheel compactor is used for preparing the asphaltic samples and Wheel tracking device is used to evaluate the rutting of asphaltic slabs. The results showed that the SBS polymer asphalt mixture gave better moisture sensitivity and better fracture resistance according to the study.It is noted that indirect tensile strength ratio (TSR) increases by 93.1 % and the rut depth decreases by 32.5 % when adding 3% SBS polymer to SMA.

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Ruge Cárdenas, Juan Carlos, Diego Andres Lozano, Luis Angel Moreno, Fausto Andres Molina Gomez, and Juan Gabriel Bastidas. "Asphalts and modiﬁed dense bituminous mixtures with rubber of military boots." DYNA 87, no. 212 (January 1, 2020): 120–28. http://dx.doi.org/10.15446/dyna.v87n212.78135.

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This article evaluates in the laboratory the physical and rheological properties of the modified asphalt cement (AC) with different contents of rubber (R) from used military boots. For the evaluation of the modified AC, laboratory tests of penetration, softening point, ductility, viscosity, short-term aging and determination of the rheological parameters in the DSR dynamic shearing rheometer were performed. In addition, the mechanical performance of a conventional asphaltic dense mixture (control) and three dense asphalt mixtures with modified asphalt cement with different rubber contents, wet-added, was evaluated by means of monotonic load tests (Marshall Stability) and dynamic (dynamic module). The physical and rheological evaluation of the AC modified with R indicates a significant increase in stiffness as a function of the R content. The asphalt mixtures studied, in reference to the control mixture, presented the same optimum content of asphalt and an increase in the Mar-shall rigidity and dynamic module. Therefore, it was found that the addition of rubber from military boots used in the asphalt cement and later in the mixture, can be considered viable from the technical and environmental point of view, due to the improvement in the mechanical properties of these materials and to allow a form of correct final disposal of the rubber.

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Wang, Zhen Jun, Rui Wang, Qiong Wang, and Guang Ying Yang. "Study of Mastic-Aggregate Interfacial Adhesion in Cement Emulsified Asphalt Mixture Based on the Discrete Element Method (DEM)." Advanced Materials Research 413 (December 2011): 367–70. http://dx.doi.org/10.4028/www.scientific.net/amr.413.367.

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Cement emulsified asphalt mixture is a kind of composite materials, which is comprised of organic and inorganic materials, such as emulsified asphalt and cement, and has both advantages of cement concrete and asphalt concrete. Aiming at the problems of cement emulsified asphalt mixture that adhesion decline and road performance down in the using of process, the Discrete Element Method (DEM) was used to simulate two different kinds of aggregate used in the mixture. Through comparing the splitting strength, stress-strain curve, fracture development situation, and so on, suitable aggregate type, limestone aggregate, was obtained, which had higher adhesion property with cement emulsified asphalt binders.

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Fan, Zhenyang, Xuancang Wang, Zhuo Zhang, and Yi Zhang. "Effects of Cement–Mineral Filler on Asphalt Mixture Performance under Different Aging Procedures." Applied Sciences 9, no. 18 (September 10, 2019): 3785. http://dx.doi.org/10.3390/app9183785.

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Cement-containing mineral powder can effectively improve the moisture stability of an asphalt mixture; therefore, this study systematically summarizes the research status of cement–mineral fillers on the performance of an asphalt mixture and determines the limitations of related studies. In this study, long-term performance tests of styrene-butadiene-styrene- (SBS)-modified asphalt mixtures are designed and evaluated with different blending ratios of the cement–mineral powder under three aging conditions. Moreover, the effect of the cement–mineral composite filler on long-term performance of the asphalt mixture using different blending ratios is determined. Cement improves the high-temperature performance and water stability of asphalt mixtures, but only for certain aging conditions. Considering the regulations for the road performance of asphalt mixtures for three aging conditions, as well as long-term performance considerations, the results indicated that the mass ratio of Portland cement to mineral powder must not exceed 2:2. Low-temperature bending and splitting tensile tests confirmed that an excessive amount of cement filler will embrittle the modified asphalt mixture during long-term aging, thereby deteriorating the tensile properties. The mechanism by which the filler influences the performance of the asphalt mixture should be further studied from the perspective of microscopic and molecular dynamics.

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Li, Junxiao, Wei Fu, and Hechao Zang. "Performance on Water Stability of Cement-Foamed Asphalt Cold Recycled Mixture." MATEC Web of Conferences 142 (2018): 02005. http://dx.doi.org/10.1051/matecconf/201814202005.

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Through designing the mixture proportion of foamed asphalt cold in-place recycled mixture combined with the water stability experiment, it shows that the addition of cement can obviously improve foamed asphalt mixture’s water stability and the best cement admixture is between 1% ~ 2%; Using digital imaging microscope and SEM technology, the mechanism of increasing on the intensity of foamed asphalt mixture resulted by adding cement was analyzed. It revealed that the cement hydration products contained in the foamed asphalt mixture hydrolyzed into space mesh structure and wrapped up the aggregate particle, this is the main reason that the cement can enhance the mixture’s intensity as well as the water stability. This research provides reference for cement admixture’s formulation in the designing of foamed asphalt cold in-place recycled mixture.

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Azarhoosh, Alireza, Mehdi Koohmishi, and Gholam Hossein Hamedi. "Rutting Resistance of Hot Mix Asphalt Containing Coarse Recycled Concrete Aggregates Coated with Waste Plastic Bottles." Advances in Civil Engineering 2021 (June 21, 2021): 1–11. http://dx.doi.org/10.1155/2021/9558241.

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The use of recycled concrete aggregate (RCA) as a part of coarse aggregates in asphalt pavements confers economic and environmental benefits. Coarse RCA (CRCA) has inferior mechanical and physical properties compared to natural aggregates due to very porous and weakly adhered cement mortar. In this study, CRCA surfaces were coated with waste plastic bottles (WPB) and used at 15%, 30%, and 50% in the asphalt concrete. The Marshall, stiffness modulus, and dynamic creep tests were performed to determine the strength of hot mix asphalts against rutting. The results revealed that the use of untreated CRCA reduced the Marshall quotient and the rutting resistance of the asphalt concrete. The results of the stiffness modulus and dynamic creep tests indicated that CRCA incorporation increased permanent deformation in the tested specimens due to the reduction of asphalt concrete stiffness. However, the asphalt concrete containing treated CRCA had lower permanent deformation because WPB promotes CRCA stability by penetrating its void and reinforcing cement mortar. Furthermore, by raising the temperature, the strength of all asphalt concretes decreased against rutting, and the reduction rate was higher in the modified specimens.

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Du, Shao Wen, and Deng Feng Huang. "The Effect of Cement on Performance Properties of Foam Asphalt Cold Recycled Mixture." Applied Mechanics and Materials 178-181 (May 2012): 1379–82. http://dx.doi.org/10.4028/www.scientific.net/amm.178-181.1379.

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Foamed asphalt can be used to stabilize reclaimed asphalt pavement materials at environment temperature. In this paper, the effect of cement on the performance properties of foam asphalt recycled mixture were evaluated by laboratory tests, including indirect tensile strength (ITS) test, moisture resistance test, rutting test and low temperature bending test. The test results find cement can improve the ITS, moisture resistance and rutting resistance of foam asphalt recycled mixture. However, the higher cement content can decrease the low temperature bending failure strain. Therefore, it is recommended the optimal cement content for foam asphalt recycled mixture is between 1.5% and 2.5%.

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Olukanni, E. O., O. J. Oyedepo, and A. M. Ajani. "Performance and Microstructural Evaluation of Asphalt Concrete Produced with Hydrated Lime, Glass Powder and Cement Modifiers." Nigerian Journal of Technological Development 18, no. 4 (February 9, 2022): 296–301. http://dx.doi.org/10.4314/njtd.v18i4.5.

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The increasing axle load arising from the growth in vehicular volume reduces the durability of road pavement, hence the need to further strengthen the road pavement. This research focuses on the determination of the performance of asphalt concrete in relation to the microstructural characteristics of the asphaltic concrete produced with hydrated lime, glass powder and ordinary Portland cement as modifiers. Asphalt Concrete (AC) mixes were prepared with Dangote 3X cement (D3C), Lafarge Superset cement (LSC), hydrated lime (HL) and glass powder (GP) in varying proportions of 20, 40, 60, 80 and 100%. The stability and morphology of the asphalt concrete produced were determined using Marshall stability test and scanning electron microscopy respectively. AC containing GP and HL showed maximum stability of 3.61 kN and 4.01 kN respectively. The maximum stability values obtained for the samples containing D3C and LSC as fillers are 4.21 kN and 5.10 kN respectively; these stability values meet the minimum Marshall Design criteria of the Asphalt Institute. The microstructural analysis of the asphalt concrete samples showed that GP has the lowest maximum pore value of 4.39 µm2 in which the inter-particulate spaces in the AC produced with GP are small and the agglomeration of the particles indicated that they are densely packed and are characterized with good strength.

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Dołżycki, Bohdan, Mariusz Jaczewski, and Cezary Szydłowski. "The Impact of Long-Time Chemical Bonds in Mineral-Cement-Emulsion Mixtures on Stiffness Modulus." Baltic Journal of Road and Bridge Engineering 13, no. 2 (June 25, 2018): 121–26. http://dx.doi.org/10.7250/bjrbe.2018-13.406.

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Deep cold in-place recycling is the most popular method of reuse of existing old and deteriorated asphalt layers of road pavements. In Poland, in most cases, the Mineral-Cement-Emulsion mixture technology is used, but there are also applications combining foamed bitumen and cement. Mineral-Cement-Emulsion mixtures contain two different binding agents – cement as well as asphalt from the asphalt emulsion. Asphalt creates asphalt bonding (responsible for flexible behaviour), whereas cement generates hydraulic bonds (responsible for stiffness of the layer). Final properties of Mineral- Cement-Emulsion mixtures are a result of a combination of both binding agents. While the stiffness of the material is unaffected by asphalt bonding, an increase in stiffness with time is visible for materials treated with hydraulic binders. This publication presents the change in stiffness modulus of Mineral-Cement-Emulsion mixtures by Simple Performance Test. For the analysis, two batches of specimens were used: the first was tested 28 days after compaction (period stated in Polish recommendations) and the second was tested 1.5 years after compaction. Analysis showed that after 1.5 years the stiffness modulus increased by about 10% in comparison to the 28 days after compaction. The change is minor but still significant. Unexpectedly, the level of the increase was unaffected by the combination of the binding agents (asphalt emulsion, cement).

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Wang, Duanyi, Xiayi Liang, Danning Li, Hehao Liang, and Huayang Yu. "Study on Mechanics-Based Cracking Resistance of Semiflexible Pavement Materials." Advances in Materials Science and Engineering 2018 (November 21, 2018): 1–10. http://dx.doi.org/10.1155/2018/8252347.

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Semiflexible mixture is a composite paving material combining the advantages of both asphalt and cement concrete materials. It consists of matrix asphalt skeleton and cement mortar. Due to the different volume characters between asphalt structure and cement mortar, stress concentration always happens in this semiflexible mixture, leading to internal cracking. The objective of this study is to alleviate the internal cracking concern of the semiflexible mixture by adjusting the material components. To this end, optimal material design and numerical simulation have been conducted. Matrix asphalt structures with four different air voids were incorporated with different dosages of cement mortar. The contraction strain and expansion strain of cement mortar as well as the indirect tensile strength of matrix asphalt structure were measured. The results were input into ABAQUS for numerical simulation. The results indicated that (1) the internal stress in this semiflexible mixture is mainly determined by the contraction of cement mortar, rather than expansion; (2) larger air void of matrix asphalt structure and less volumetric variation of cement mortar reduce the internal stress; (3) once the air void of matrix asphalt structure is decided, both maximum contraction and expansion deformations of cement mortar should meet specific requirement to ensure less internal cracking. This is a practical-ready paper that provides reference for the anticracking design of semiflexible pavement.

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Deng, Wei Hua. "Powder-Cement Ratio Affects the Overall Performance of the ATB." Applied Mechanics and Materials 744-746 (March 2015): 1448–51. http://dx.doi.org/10.4028/www.scientific.net/amm.744-746.1448.

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Powder-cement ratio plays a key role in asphalt mixture. Only after asphalt adsorbs the surface of mineral powder to form a thin film, asphalt produces the adsorption on aggregate, so slag asphalt is real asphalt binder. Powder-cement ratio is different, road performance is different too. Through laboratory test, analysis powder-cement ratio reflects on heat, cold, water stability and anti-reflective cracks of ATB, make a range of radio of filler to bitumen, in order to provide a reference for the design of ATB composition.

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Kukiełka, Jerzy. "Mechanical properties of cement and cement-asphalt matrices with rubber powder." Budownictwo i Architektura 16, no. 3 (December 2, 2017): 053–63. http://dx.doi.org/10.24358/bud-arch_17_163_06.

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Cement matrices are known from concrete testing. Cement-asphalt matrices made of cement and asphalt emulsion are used in mineral-cement-emulsion mixes (MCEM). The matric strength in MCEM mixtures has not been studied so far. Cement-asphalt matrices with 0/1 mm rubber powder are proposed by the author for use in the MCEM [3, 26]. In this paper the results of the investigation of the mechanical properties of matrices are presented for comparative purposes and for the preliminary evaluation of their suitability for MCEM. The following tests were made: indirect tensile strength, bending strength, compressive strength and rigidity modules in NAT and 4 PB-PR.

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Cihackova, Pavlina, Petr Hyzl, Dusan Stehlik, Ondrej Dasek, Ovidijus Šernas, and Audrius Vaitkus. "Performance characteristics of the open-graded asphalt concrete filled with a special cement grout." Baltic Journal of Road and Bridge Engineering 10, no. 4 (December 15, 2015): 316–24. http://dx.doi.org/10.3846/bjrbe.2015.40.

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This paper presents a performance of the open-graded asphalt concrete filled with a special cement grout in the road structures, introduces practical examples of the usage of this technology and defines the main properties. In addition, laboratory design of asphalt mixtures filled with special grout is researched. Finally, the results obtained from various laboratory tests are evaluated. The paper contains the open-graded asphalt concrete filled with a special cement grout mix design procedure and results of stiffness measurement, low temperature properties, permanent deformation and skid resistance. Open-graded asphalt concrete filled with a special cement grout mixture is compared to the commonly used asphalt mixes. The open-graded asphalt concrete filled with a special cement grout showed better results than the commonly used asphalt mixes by the stiffness and resistance to the permanent deformation characteristics but behavior at the low temperatures is slightly problematic.

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Bang, Jin Wook, Byung Jae Lee, and Yun Yong Kim. "Development of a Semirigid Pavement Incorporating Ultrarapid Hardening Cement and Chemical Admixtures for Cement Grouts." Advances in Materials Science and Engineering 2017 (2017): 1–9. http://dx.doi.org/10.1155/2017/4628690.

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Mechanical tests were carried out to evaluate the influence and effects of fluidity and compressive strength of cement grout on semirigid asphalt pavement. An open graded asphalt skeleton was designed in order to achieve target porosity in the range of 18~22%. In addition, four types of cement grout mixtures were produced with varying mix proportions with ultrarapid hardening cement and chemical admixtures, that is, accelerating and retarding agents. For the semirigid pavement specimens, mechanical experiments to measure properties such as porosity, flexural strength, Marshall stability, and wheel tracking resistance were carried out. The test results demonstrated that the flow time (fluidity) of cement grout is the most significant factor that determines the mechanical properties of semirigid asphalt specimens under constant condition of the open graded asphalt skeleton. For the semirigid pavement mixing proportion in the current study, it is recommended that the porosity of the open graded asphalt skeleton and flow time of cement grout should be 20% and within 12 seconds, respectively.

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Weng, Xing Zhong, Jian Qiang Jia, Xiang Cheng Yan, and Jian Zhong Jia. "Application of WMA on Thin Overlay on Airport Cement Concrete Pavement." Advanced Materials Research 255-260 (May 2011): 3345–49. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.3345.

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Considering the hot mix asphalt compaction quality is difficult to reach and it can be destroyed easily, the warm mix asphalt is used for thin overlay of airport cement concrete pavement. The mixture proportion of warm mix asphalt was designed, the performance of the base asphalt and the modified emulsify asphalt were measured, and the optimum asphalt quantity was determined, then the performance comparison between warm mix asphalt and hot mix asphalt were analyzed. Results indicate that warm mix asphalt has the same performance with hot mix asphalt, it can also satisfy the requirement of the airport cement concrete pavement thin overlay. Finally, in order to validate the project application effect, the warm mix asphalt was used in a northwest airport cement concrete pavement thin overlay. After four years use, the construction of the pavement is in good condition, and no disease emerging, the performance can meet the using requirements of the airport.

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36

Ullah, Rafi, Imran Hafeez, Syed Bilal Ahmed Zaidi, Jamal Jamal, and Safeer Haider. "Study the Effect of Substitution Filler on performance of Asphalt Mixture." Civil Engineering Journal 6, no. 9 (September 1, 2020): 1704–14. http://dx.doi.org/10.28991/cej-2020-03091576.

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The major distresses in asphalt pavements are rutting, fatigue, and adhesion loss (moisture susceptibility). In this research study, two substitution fillers (Cement and Lime) were used with two different aggregate quarries (based on minerals composition) to evaluate the relatively most beneficial combination of both fillers as well as an aggregate quarry to enhance the performance life of asphalt pavements, especially in under-developed countries. Four basic tests, (Asphalt Pavement Analyzer, Four Points Bending Beam, Dynamic Modulus, and Rolling Bottle Test) that used for the most desired properties of any asphalt pavement, were utilized to access the performance properties of modified asphalt mixture. Based on all laboratory test results this research study concludes that replacement of aggregate filler with hydrated lime and cement has a beneficial effect on asphalt mix performance and to save investment by using raw material. Substitution filler improves the high-temperature rut performance and intermediate temperature fatigue performance of asphaltic concrete mixture up to 25% to that of the conventional mixture. At the same time, substitution filler has more beneficial to improve 70% adhesion properties to that of the conventional mixture.

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37

Nanthavisit, Patcharapan, Peerapong Jitsangiam, and Preda Pichayapan. "Effect of Cement-Asphalt Emulsion Mortar Based on a Laboratory Investigation." Key Engineering Materials 801 (May 2019): 404–9. http://dx.doi.org/10.4028/www.scientific.net/kem.801.404.

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As known, cement has been used as a stabilizing agent for the road pavement stabilization technique. However, it could cause an adverse effect of premature cracking on road, resulting from the inherent brittle manner of cement-stabilized materials. This research aims to investigate on a cement-asphalt emulsion mixture as a new stabilizing agent which would provide more flexibility of the road-stabilized material. Cement-asphalt emulsion mortar (CAE) (the mixture of Portland cement type I, asphalt emulsion type CSS-1, and standard sand) was used as the study material. The compressive strength and flexural strength of CAE mortar with varying cement and asphalt emulsion ratios at 7 days and 28 days testing with controlled relative humidity curing were performed. The test results showed that the flexural strength and the compressive strength decrease with an increase of asphalt emulsion (at fixed ratio CAE mortar). The strength at 7 days of curing is around 70% of that for 28 days of curing. The ratio 4:1 (cement: asphalt emulsion) exhibited the highest compressive strength and the flexural strength at 28 days. This result of this research is likely promising to obtain a new stabilizing agent which can create the flexibility property of a road-stabilized material.

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38

Kuźniewski, J., Ł. Skotnicki, and A. Szydło. "Fatigue durability of asphalt-cement mixtures." Bulletin of the Polish Academy of Sciences Technical Sciences 63, no. 1 (March 1, 2015): 107–11. http://dx.doi.org/10.1515/bpasts-2015-0012.

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Abstract This paper focuses on examinations of asphalt-cement mixtures (ACM). This is a recycled material which can be used in road pavement layers. In the article stiffness modulus tests and fatigue tests of asphalt-cement mixtures were shown. The authors decided to lead research on fatigue durability of asphalt-cement mixtures to set fatigue characteristics of these materials. So far in research or other works any adequate fatigue criterion for ACM mixtures has not been developed. As a result of the examinations a level of fatigue damage was suggested. For new fatigue damage a strain level in one million load cycle was estimated. Based on that a fatigue design criterion for asphalt-cement mixtures was estimated.

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Silva Almeida, Marcilio, Livia Da Silva Oliveira, David Barbosa de Alencar, and Francisco Carlos Tavares Amorim. "Mechanical Analysis of Asphalt Pavements with Alternative Materials in Manaus - Amazonas." International Journal for Innovation Education and Research 7, no. 10 (October 31, 2019): 646–62. http://dx.doi.org/10.31686/ijier.vol7.iss10.1811.

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Pathologies in urban roads are common and recurring problems in the municipality of Manaus - AM, where defects have appeared early and successfully, especially the climatic condition of the differentiated region and the non-participation of the coarse aggregate in the asphaltic coating and sublayers. predominantly made of clay. Nevertheless, the Government often performs simple "hole-covering" operations to recover and restore such a structure, corroborating all the problems that trigger poor paving in the State Capital of Amazonas. Another challenge of the municipal administration is the disposal of construction waste, making it necessary to recycle it, highlighting the serious environmental problem caused by the extraction of the pebble. Aiming to contribute with alternatives the scarcity of stone material and the natural aggregate (pebble), substitute of gravel in the regional civil construction, it is proposed the use of construction and demolition waste (RCD). Asphalt concrete (AS) mixtures were made with recycled material, residual sand, portland cement, petroleum asphalt cement (CAP 50/70) and this binder modified with the addition of SBS (styrene and butadiene copolymer). Characterization tests were performed with aggregates, filler and petroleum asphalt cement (original and polymer), dosed by the Marshall method, and the asphalt mixtures were subjected to the Beam Fatigue Test at three different stress levels. The studies indicated satisfactory results of asphalt mixtures with the participation of RCD and SBS binder, compared to regional composites.

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Pi, Yuhui, Zhe Huang, Yingxing Pi, Guangcan Li, and Yan Li. "Composition Design and Performance Evaluation of Emulsified Asphalt Cold Recycled Mixtures." Materials 12, no. 17 (August 22, 2019): 2682. http://dx.doi.org/10.3390/ma12172682.

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Based on an analysis of the cold regeneration mechanism of emulsified asphalt, the emulsified asphalt binders and cement were applied to prepare the cold recycled mixtures, and the main technical performances of the designed mixtures were evaluated, including high-temperature stability, water stability, and fatigue characteristics. A high content of 65% recycled asphalt pavement (RAP) material was used with some new aggregates and mineral powders, and the optimal emulsified asphalt binder and cement dosages were determined as 2.9% and 1.5% respectively. The technical performance test results show that: (1) The well-designed emulsified asphalt cold recycled mixtures have good high-temperature stability and water stability, and can meet the requirements of the road base layer and the lower layer. (2) When the stress level is lower, the fatigue performance of mixtures with lower emulsified asphalt binder dosage and lower cement content is better, but when the stress level is higher, the high dosage of emulsified asphalt binder is more favorable, while the cement content has little effect on the fatigue property. (3) The emulsified asphalt cold recycled mixtures have relatively poor fatigue resistance, and their fatigue life is significantly lower than that of the hot mixed asphalt mixtures.

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Fang, Xing, Alvaro Garcia-Hernandez, and Pietro Lura. "Overview on cold cement bitumen emulsion asphalt." RILEM Technical Letters 1 (December 29, 2016): 116. http://dx.doi.org/10.21809/rilemtechlett.2016.23.

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Cold mix asphalt, a promising substitute for conventional hot mix asphalt, is manufactured at ambient temperature using bitumen emulsion as binder. To improve its strength and durability, cement is often added to the mixture. This review (1) presents an overview about advances in cold mix asphalt modified with cementitious materials, often called CBEA (cement bitumen emulsion asphalt), (2) illustrates advantages and disadvantages of CBEA and (3) gives recommendations to produce homogenous CBEA mixtures

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42

Yang, Yanhai, Ye Yang, and Baitong Qian. "Performance and Microstructure of Cold Recycled Mixes Using Asphalt Emulsion with Different Contents of Cement." Materials 12, no. 16 (August 10, 2019): 2548. http://dx.doi.org/10.3390/ma12162548.

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Cold recycled mixes using asphalt emulsion (CRME) is an economical and environmentally-friendly technology for asphalt pavement maintenance and rehabilitation. In order to determine the optimum range of cement contents, the complex interaction between cement and asphalt emulsion and the effects of cement on performance of CRME were investigated with different contents of cement. The microstructure and chemical composition of the fracture surface of CRME with different contents of cement were analyzed in this paper as well. Results show that the high-temperature stability and moisture susceptibility of CRME increased with the contents of cement increasing. The low-temperature crack resistance ability gradually increased when the content of cement is increased from 0% to 1.5%. However, it gradually decreased when the content of cement is increased from 1.5% to 4%. Cold recycled mixes had better low-temperature cracking resistance when the contents of cement were in the range from 1% to 2%. The results of microstructure and energy spectrum analysis show that the composite structure is formed by hydration products and asphalt emulsion. The study will be significant to better know the effects of cement and promote the development of CRME.

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43

Du, Shao Wen, Wei Xu, and Shan Shan Li. "The Mechanical Properties of Foam Asphalt Mixture." Applied Mechanics and Materials 71-78 (July 2011): 1150–53. http://dx.doi.org/10.4028/www.scientific.net/amm.71-78.1150.

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The mechanical properties of foam asphalt mixture are investigated, including indirect tensile strength (ITS), moisture resistance, rutting resistance and fatigue resistance. The test results indicate the 40°C3d curing mehod can stimulate the 30d or 60d natural environment temperature (25°C) curing procedures, which can quickly evaluate the long term ITS of foam asphalt mixture with cement or without cement. Cement can obviously improve the ITS, moisture resistance and fatigue test. The paper recommends proper cement content of foam asphalt mixture should be in between 1.5% to 2.5%.

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44

Zhang, Haitao, Liang Meng, and Guangkuo Zhang. "Comparative study on mechanical performance of asphalt–cement mortar and emulsified asphalt–cement mortar." Road Materials and Pavement Design 18, no. 5 (July 2016): 1239–50. http://dx.doi.org/10.1080/14680629.2016.1202857.

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Aryngazin, Kapar, Mariya Zhulasheva, Assem Abisheva, Aygerim Takirova, and Dina Aligozhina. "Features of the production of cement asphalt concrete using fuel ash." Technobius 2, no. 1 (March 17, 2022): 0012. http://dx.doi.org/10.54355/tbus/2.1.2022.0012.

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In this work, the objects of research are cement asphalt concrete obtained on the basis of cement binder and bitumen emulsion, using as mineral additives, waste from thermal power plants, in the form of fuel ash of various types. The analysis of foreign and domestic literature on this topic is carried out. In order to reduce the amount of inorganic binder (cement) consumed, as well as modification of organic binder (bitumen emulsion), fuel ashes of two domestic producers, ashes of CHP-2 and CHP-3 of Pavlodar based on Ekibastuz coals, were studied in the work. The influence of fuel ash on the properties of binders used in the work, as well as the properties of cement asphalt concrete compositions based on binders using fuel ash, has been established. The features of the production of cement asphalt concrete using fuel ash are described. The results of testing cement asphalt concrete without the use and with the use of fuel ash are presented.

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Wiyono, Eko, and Anni Susilowati. "Variasi Kadar Filler Pada Campuran Beton Aspal Menggunakan Bahan Tambah Anti Stripping." Jurnal Ilmiah Rekayasa Sipil 16, no. 2 (November 3, 2019): 76–83. http://dx.doi.org/10.30630/jirs.16.2.226.

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Filler function to fill cavities between aggregate granules which can affect the characteristics of asphalt concrete mixture. The purpose of this study is to obtain the characteristics of AC-WC asphalt concrete mixtures and determine the optimum variation of filler content on AC-WC asphalt concrete mixtures using cement fillers and anti-stripping additives that meet the specifications of Bina Marga 2010. ; 5.5%; 6%; 6.5%; 7%; 7.5%; and 8% each made with a variation of cement filler of 1%; 3%; 5%; 7%; and 9%; the addition of Wetfix Be 0.3% to the asphalt. The method of implementation is by mixing the wetfix Be first with asphalt, then aggregating according to the ideal mix gradation proportions. Dependent variables (research parameters) include density, percent cavity in aggregate (VMA), percent cavity filled with asphalt (VFB), percent cavity against mixture (VIM), stability, melt, and results for Marshall (MQ). Marshall testing method based on SNI 06-2489-1991. The results of the study obtained KAO in 1% cement filler variation; 3%; 5%; 7%; and 9%, each at 6.75%; 6.5%; 6.35%; 6.5% and 7.125%. KAO average of 6.65%. The range of cement filler levels which still meet the Marshall parameters at 2% cement filler up to 9%. The optimum cement filler content for asphalt concrete mixture is 5.5%, with a VMA value of 19.19%; VFB 77.12%; VIM 4.39%; Stability of 1670.48kg; melting 4.80mm, and MQ 349.78 kg / mm, meeting the specifications of Bina Marga 2010.

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47

Jiahong, Wu. "Research on Crack Resistance of Semi-flexible Pavement Materials." E3S Web of Conferences 248 (2021): 01020. http://dx.doi.org/10.1051/e3sconf/202124801020.

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Semi-flexible pavement has been widely used in China's road construction due to its excellent rutting resistance. Due to the large difference in volume stability between the matrix asphalt mixture and the cement mortar, the internal stress of the semi-flexible pavement material is concentrated and cracking is likely to occur. To explore the influence of different Influencing factors on the cracking resistance of semi-flexible pavement materials. This paper used the orthogonal design method to design the mix ratio of ordinary cement mortar. On this basis, admixtures (silica fume, ordinary emulsified asphalt, water-based epoxy resin) were added to prepare special cement mortar. Then, using cement mortar type, matrix porosity, matrix asphalt type, matrix aggregate type as the influencing factors, this article has studied his influence on the crack resistance of semi-flexible pavement materials. Tests show that cement mortar type, matrix porosity, matrix asphalt type, matrix aggregate type have varying degrees of influence on the crack resistance of semi-flexible pavement. The effect of matrix porosity on low temperature crack resistance is the greatest, followed by asphalt and cement mortar types, and the lowest by aggregate type. Enhancing the flexibility of cement mortar and enhancing the elastoplasticity of the matrix are conducive to improving the low-temperature performance of semi-flexible pavements.

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Underwood, B. Shane, and Y. Richard Kim. "Nonlinear viscoelastic analysis of asphalt cement and asphalt mastics." International Journal of Pavement Engineering 16, no. 6 (August 7, 2014): 510–29. http://dx.doi.org/10.1080/10298436.2014.943133.

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Umar, Hussaini, Xiaohui Zeng, Xuli Lan, Huasheng Zhu, Yirui Li, Hong Zhao, and Haichuan Liu. "A Review on Cement Asphalt Emulsion Mortar Composites, Structural Development, and Performance." Materials 14, no. 12 (June 21, 2021): 3422. http://dx.doi.org/10.3390/ma14123422.

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The use of cement emulsified asphalt mortar (CA mortar) in the track structure of high-speed speed railways has been gaining considerations by many researchers due to its coupled merits of the strength of cement as well as the flexibility of asphalt material. The asphalt to cement ratio (A/C) and the compatibility among constituent materials are crucial to the properties of CA mortar. To improve the performance properties and application of CA mortar, it is imperative to have a broad understanding of the composition mechanisms and compatibility between constituent materials. This paper summarizes interesting research outcomes related to the composition and properties of CA mortar. The consumption of water by cement promotes the breakdown of emulsified asphalt, likewise, the adsorption of asphalt droplets on the surface of cement grains retards the hydration process of cement. An appropriate A/C is required for the cement hydration rate to match the speed of demulsification of asphalt emulsion. Depending on the type and properties for which the CA mortar is designed to possess, the A/C ranges from 0.2 to 0.6 for type 1 (CAM I), and 0.6 to 1.2 for type 2 (CAM II). This paper also discusses measures taken to improve performance properties, compatibility, the interaction between constituent materials of CA mortar, and the use of additives as a partial replacement of cement in CA mortar production. The current review also suggests areas of interest for future research studies. This paper is useful to those who aim to understand or study the composition mechanisms and performance properties of CA mortar.

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Yung-Vargas, Y. W., H. A. Rondón-Quintana, and J. E. Córdoba-Maquilón. "Evaluation of recycled asphalt pavement in Colombia." Journal of Physics: Conference Series 2153, no. 1 (January 1, 2022): 012007. http://dx.doi.org/10.1088/1742-6596/2153/1/012007.

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Abstract Reclaimed asphalt pavements are obtained from existing pavements through recovery techniques and are used for new asphalt mixtures production with the inclusion of virgin aggregates and asphalt cement, constituting environmentally friendly mixtures at a lower total cost, by requiring fewer quantities of new materials. This research, unlike the studies found on the subject, focuses on the study of reclaimed asphalt pavement by analyzing its granulometric distribution and asphalt cement content. For this purpose, representative reclaimed asphalt pavement samples were taken from four Colombia cities, to verify their heterogeneity. The obtained reclaimed asphalt pavement was analyzed in the laboratory, to obtain the material granulometric distribution, through extraction and asphalt content tests, following Colombian regulations from the “Instituto Nacional de Vías”. The results show that the granulometry of all cities has a central tendency (average) that moves towards an upper limit in the 2 mm particles. When analyzing the granulometry separately of the four cities, it is observed that they present a different trend in their granulometry, which shows their heterogeneity. The asphalt cement content presented values between 4.0% and 5.0%.

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Journal articles on the topic 'Asphalt cement'

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