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Journal articles on the topic 'Micro-admixture'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Yu, Tao. "Study on the Influence of Recycled Composite Micro Powder on the Performance of Mortar." International Journal of Materials Science and Technology Studies 3, no. 2 (2025): 1–8. https://doi.org/10.62051/ijmsts.v3n2.01.

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In the rapid urbanization process, the extensive development model of China's construction industry has led to excessive consumption of natural resources and intensified environmental. Its resource utilization has become an important topic for the sustainable development of the industry. This study proposes a composite admixture technology path to address the technical bottlene in the application of recycled micro-powder. By constructing a binary composite system of recycled concrete powder (RCP) and recycled brick powder (RBP), the characteristics and multi-age mechanical properties were syst

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2

Lopes, R. C., G. W. Bacarji, E. Bacarji, and A. M. Oliveira. "Influence of crystallizing type chemical admixture on precast micro concretes: a statistical analysis and holistic engineering overview." Materiales de Construcción 74, no. 353 (2024): e336. http://dx.doi.org/10.3989/mc.2024.352323.

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The aim of this paper is to evaluate the influence of a crystallizing chemical admixture on precast micro concretes with two water contents (7% and 11%, by dried mass) and two different conditions of exposure. Thus, precast micro concretes with a composition of 1:3 (cement: fines) with and without crystalline chemical admixture were evaluated on compressive strength (at the age of 28 and 154 days) and water absorption by immersion (at the age of 154 days). Statistical analysis showed that the only significant factor was the effect of the water content on the compressive strength. Besides that,

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3

Li, Wen Hua, Shi Sheng Zhou, and Xu Dong Chen. "Mix Design and Performance Test of High-Strength Fluid and Micro-Expansion Concrete with the Additive of CAN." Applied Mechanics and Materials 71-78 (July 2011): 1277–81. http://dx.doi.org/10.4028/www.scientific.net/amm.71-78.1277.

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High-strength flowing concrete is made of large volume of gelled materials and high rate of sand, but low content of coarse aggregate and small grain diameter, which makes it easy to have a greater contraction, resulting in reduced strength and durability of concrete[4] .So the right amount of expansion admixture is needed to ensure that there is no shrinkage or micro-expansion of the concrete. In this paper, the right mixing ratio of the concrete will be achieved, which is consistent with needs of project, by designing tests of mixing ratio of different gelled materials (cement, fly ash, sili

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4

Zhang, Ming, Feng Xing, De Cheng Zhang, and Yun Fei Zhang. "Effect of Admixture on Mechanical Behavior and Micro-Structure of Sulphoaluminate Composite Material." Advanced Materials Research 113-116 (June 2010): 2193–96. http://dx.doi.org/10.4028/www.scientific.net/amr.113-116.2193.

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Mechanical behavior of sulphoaluminate cement (SAC) mortar mixed slag (SL), fly ash (FA) and combined admixture were studied in the study, at the same time, hydration products and micro-structure were analyzed with XRD and SEM for making clear hydration mechanism. Test results show that early period strength of SAC mortar decreased, and strength contribution rate of admixture is combined admixture (slag + fly ash) ＞ slag ＞ fly ash on the same content due to the combined admixture is more beneficial to accelerate hydration. Yet strength increase of SAC mortar mixed admixture after cured 60d is

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5

Hrbek, Vladimír, Zdeněk Prošek, Roman Chylík, and Lukáš Vráblík. "MICROSCOPICAL AND MICROMECHANICAL FEATURES OF HIGH PERFORMANCE CONCRETE CONTAINING LOW LEVELS OF FLY ASH." Acta Polytechnica CTU Proceedings 21 (March 21, 2019): 10–15. http://dx.doi.org/10.14311/app.2019.21.0010.

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Alkali activated fly ash is a widely used admixture to the concrete. Due to the pozzolanic activity, the fly ash can replace up to 60 mass percentage. The impact of fly ash on the concrete depend on the level of it content, i.e. in small levels it improves the macro-mechanical properties and durability as well as chemical resistance. On the other side, fly ash admixture negatively influence the set time and cause slow development of strength. Therefore, the effect of small fly ash admixture levels on the micro-structure of high performance concrete (HPC) is discussed in this study.

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6

Bekem Kara, İlknur, and Ömer Furkan Durmuş. "Effect of nano silica on cement mortars containing micro silica." Challenge Journal of Concrete Research Letters 10, no. 2 (2019): 42. http://dx.doi.org/10.20528/cjcrl.2019.02.003.

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The use of cement and concrete is becoming increasingly widespread all over the world. However, the high energy consumption required for the production of clinker and the greenhouse gas emissions generated during production negatively affect both the economy and the environment. In the studies conducted for many years, researchers have found that the substitution of various pozzolans with cement provides both technical advantages and environmental benefits. The use of pozzolans in cementitious composites provides advantages such as the improvement of the physical and mechanical properties of t

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7

Wang, Fu Xing, Guo Zhong Li, and Juan Chen. "Reutilization of RFA of Construction Waste in Cement Mortar." Applied Mechanics and Materials 468 (November 2013): 57–60. http://dx.doi.org/10.4028/www.scientific.net/amm.468.57.

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The effect of some factors(dosage and grain size of recycled fine aggregate of construction waste, content of mineral admixture) on the properties of cement mortar was studied. The results indicated that when recycled fine aggregate particles gradation was areaⅡ, replacement percentage (sand) was 60%,dosage of mineral admixture was 36%, compared with blank sample, the 28d flexural strength and the compressive strength of cement mortar samples were increased by 30.7% and 37.2%, respectively. Micro-morphology of section on cement mortar was observed by SEM. Identifying the hydration products thr

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8

Xiao, Li Guang, Zhuang Zhao, Rui Bo Li, and Jun Jun Hu. "Research on Diatomite High-Performance Concrete Admixtures." Key Engineering Materials 517 (June 2012): 371–75. http://dx.doi.org/10.4028/www.scientific.net/kem.517.371.

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This test is mainly diatomaceous earth mineral admixture to study the content, calcination temperature, calcination time, grinding time on the properties of concrete, and through the use of SEM, XRD and other means of micro-theory analysis. The results showed that, after calcination or ball mill grinding, diatomaceous concrete admixture used to increase strength, improve durability of concrete. When the diatomite calcination temperature to 650 ,content is 2%, the volcanic activity to achieve the best value, the calcination time increased strength increases, strength increases flattened when th

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9

Mircea, Călin G. R., Tudor Panfil Toader, and Andreea Mircea. "Research upon self-sealing of fibre reinforced mortar with integral crystalline waterproofing admixtures." MATEC Web of Conferences 361 (2022): 05011. http://dx.doi.org/10.1051/matecconf/202236105011.

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The paper presents results of an experimental research made upon the self-sealing of a fibre reinforced mortar with an integral crystalline waterproofing admixture in a dosage rate of 1-3 % of the cement mass. Samples were pre-loaded in three point bending up to 90 % of the ultimate capacity and conditioned in wet-dry cycles. Micro-cracks width was measured with a microscope after pre-loading, and up to 20 days. The results show that the 3 % admixture content presents the superior self-sealing performance both in the terms of the self-sealing degree and self-sealing rate. According to the resu

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10

Kolendo, G., D. Bajare, A. Korjakins, and G. Sahnmenko. "Rubber micro granules affect water absorption and compress the strength of concrete composite." Journal of Physics: Conference Series 2423, no. 1 (2023): 012026. http://dx.doi.org/10.1088/1742-6596/2423/1/012026.

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Abstract End-of-Life cars and trucks Tyres (ELT) are still an environmental issue around the world and in Latvia. The addition of rubber additives into concrete is quite well-studied worldwide. It is known that the introduction of rubber crumb in large quantities (> 5 % by volume) reduces the mechanical strength of the material and the modulus of elasticity. The results have shown us differences between rubber crumb practical size, and the amount of admixture in concrete. Achieved results clearly showed us the difference between shredded rubber micro granules and disintegrated-like admixtur

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11

Park, Young Shin, Jung Ho Kim, Hyun Kyu Jeon, and Chee Ho Seo. "Study on the Thermal Characteristics of Concrete Using Micro Form Admixture." Journal of the Korea institute for structural maintenance and inspection 17, no. 2 (2013): 101–9. http://dx.doi.org/10.11112/jksmi.2013.17.2.101.

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12

Kola, Vikas, Venkata Ramana Gondu, and Ramana Murty Varudu. "Mechanical and micro-structural aspects of admixture stabilized rock sludge dust." Construction and Building Materials 420 (March 2024): 135552. http://dx.doi.org/10.1016/j.conbuildmat.2024.135552.

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13

Hrbek, Vladimír, Veronika Petráňová, and Jiří Němeček. "Early Stage Microstructure Development of Cement Paste Modified by Crystalline Admixture." Key Engineering Materials 722 (December 2016): 92–99. http://dx.doi.org/10.4028/www.scientific.net/kem.722.92.

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The hydrophobicity enhancement of structural materials is a contemporary topic of discussion. This paper deals with the effect of crystalline admixture (CA) on the microstructure of the cementitious composite in first four weeks after the production. Previous investigation was performed on the referential specimens consisting only from pure cement. The samples of pure CA and cement modified by 1% of CA with same w/c ratio were examined and compared in this paper. By investigation of these materials on the micro-scale in the time, it is possible to identify the development of the microstructure

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14

Mircea, Calin, Tudor-Panfil Toader, Andreea Hegyi, Brăduț-Alexandru Ionescu, and Andreea Mircea. "Early Age Sealing Capacity of Structural Mortar with Integral Crystalline Waterproofing Admixture." Materials 14, no. 17 (2021): 4951. http://dx.doi.org/10.3390/ma14174951.

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Crystalline admixtures embedded in concrete may react in the presence of water and generate thin crystals able to fill pores, capillaries and micro-cracks. Once the concrete has dried, the crystalline chemicals sit dormant until another dose of water starts the crystallization again. The research aims to analyses the early age self-sealing effect of a crystalline admixture at a dosage rate of 1–3% of the cement mass. Specimens made with two types of gravel were pre-loaded with three-point bending to up to 90% of the ultimate capacity, and conditioned through wet–dry cycles. Micro-crack closure

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15

Samad, Abdul Aziz Abdul, Josef Hadipramana, Ahmad Zaidi Ahmad Mujahid, and Noridah Mohamad. "Investigation on Energy Absorption of Slab Foamed Concrete Reinforced by Polypropylene Fibre Subjected to Impact Loading." Advanced Materials Research 831 (December 2013): 67–72. http://dx.doi.org/10.4028/www.scientific.net/amr.831.67.

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Polypropylene Fibre (PF) as reinforcement has contributed to the intensity of Foamed Concrete (FC) slab when subjected to impact loading. The presence of PF in the admixture reduces the micro-porosity that generates the micro-crack of the slab. However, the fibrillation of PF in the admixture enhances the bonding mechanism system between PF and the FC matrix. The impact test conducted uses an instrumented drop-weight impact tower. Results show that FC without PF produces a distinct radial crack and clear fragments within the crater field unlike FC with PF. However, both slab materials did not

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16

Xupeng, Chen, Sun Zhuowen, and Pang Jianyong. "Effects of active mineral admixture on mechanical properties and durability of concrete." Materials Research Express 8, no. 11 (2021): 115506. http://dx.doi.org/10.1088/2053-1591/ac3b7e.

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Abstract The purpose of this study is to figure out the effects of the active mineral admixture on the mechanical properties and the durability of the concrete. In this paper, the orthogonal test was adopted to study the effects of the metakaolin, the ultra-fine fly ash, and the silica fume on the compressive strength and the splitting tensile strength of the concrete at various curing ages, and to further determine the optimal mix ratio. After that, the ordinary concrete was taken as the control group, the Na2SO4 solution and the MgSO4 + NaCl solution were used as the corrosive medium, and th

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17

Lin, Xi, Xi Xian Ji, Xin Bo Yin, and Heng Chun Zhang. "Research on the Effect of Superfine Powder Micro Bead on the Properties of High-Strength Concrete." Advanced Materials Research 785-786 (September 2013): 235–38. http://dx.doi.org/10.4028/www.scientific.net/amr.785-786.235.

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A sub-micron spherical powder material-micro bead, which has good water reduction, filling and enhancement effect, could be used as active mineral admixture in high-strength concrete. The affection of micro bead on the hydration temperature rise, mechanical properties, and shrinkage properties of high-strength concrete were studied, and the results showed that: micro bead could reduce the highest temperature peak of concrete, and at the low water-cement ratio, its small dosage could develop the compressive strength of concrete, and after instead of silica fume with suitable dosage, it could re

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18

Tu, Liu Qing, Zhong He Shui, Wei Chen, Wen Bing Xu, and Jun Tao Ma. "Effect of Carbonation on the Microstructure of Concrete Containing Fly Ash and Expansive Admixture." Advanced Materials Research 347-353 (October 2011): 4074–80. http://dx.doi.org/10.4028/www.scientific.net/amr.347-353.4074.

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The effects of carbonation on the microstructure of concrete containing fly ash and expansive admixture are investigated in this paper. Eight mix proportions of the concrete are designed in the experiment with the different replacement levels of the Portland cement with the fly ash and the expansive admixture. The specimens cured in accelerated carbonation condition for 3 days, 7 days and 28 days are used for macro and micro tests. MIP test is used to analyze the influence on internal pore structure of concrete by carbonation reacts. The changes of Ca(OH)2 and CaCO3 contents are measured with

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19

Sharma, Kanishk, and Dolendra Patel. "Cost Optimization of Geopolymer Concrete Pavement." International Journal for Research in Applied Science and Engineering Technology 10, no. 10 (2022): 107–15. http://dx.doi.org/10.22214/ijraset.2022.46863.

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Abstract: In this study, concrete was prepared by complete replacement of sand and partial replacement of cement by Fly-Ash using different admixtures like NaOH- Na2SiO3 solution, CaO- Na2SiO3 solution, CaO- Na2SiO3 gel and Micro Silica in order to evaluate the effects of these admixtures on properties of HVFA concrete. Solutions and Gel were prepared by mixing both materials in different ratios. It was noted down in mix proportions. The study included determination of compressive strength and flexural strength with (1) Variation in NaOH- Na2SiO3 solution (2) Variation in CaO- Na2SiO3 solution

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20

Cai, Ji Wei, Zheng Hang Lü, Guang Liang Gao, and Ji Xu Wu. "Effects of Micro Fines Content on Performances of Mortar Prepared with Mill Tailings from Magnetite." Advanced Materials Research 287-290 (July 2011): 729–32. http://dx.doi.org/10.4028/www.scientific.net/amr.287-290.729.

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In production of manufactured fine aggregate (MFA) from magnetite mill tailings (MT), the micro fines (particles smaller than 75 microns) was strictly eliminated. This results in lower utilization of the resources and worse micro grading of MFA. The mortar samples were prepared with MT at various micro fines contents to investigate the effects on their fluidities and strengths. In optimal water-to-powder ratio (w/p, all powders included), the fluidities of mortars reached maximum and the strengths of mortars could be improved at suitable content of micro fines in MFA. The application proves th

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21

Song, Yongyuan, Wenjuan Zhou, Chen Zhang, and Can Yang. "Frost Resistance and Microscopic Properties of Recycled Coarse Aggregate Concrete Containing Chemical Admixtures." Materials 17, no. 19 (2024): 4687. http://dx.doi.org/10.3390/ma17194687.

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In order to increase the suitability of coarse recycled concrete aggregates and improve the frost resistance of recycled coarse aggregate concrete, this study aims to investigate the effects of an antifreeze-type water-reducing admixture, air-entraining admixture, and antifreeze admixture on the frost resistance of recycled coarse aggregate concrete. The effectiveness of these admixtures is gauged by the mass loss rate and the relative dynamic modulus of elasticity (RDM). Mercury-impressed porosimetry (MIP), super depth of field microscopy, and scanning electron microscopy (SEM) were employed

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22

Setina, Janina, Alona Gabrene, Inna Juhnevica, and Ieva Ose. "Effect of Siliceous Pozzolanic Additives on the Hydration Process of Cement." Key Engineering Materials 604 (March 2014): 110–13. http://dx.doi.org/10.4028/www.scientific.net/kem.604.110.

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The given study investigates the influence of pozzolanic admixtures both micro- and nanosize silica and biomass ashes on microstructure and properties of hydration process of cement paste. The investigations were carried out by - XRD, SEM and FTIR. Pozzolanic activity of the concrete admixtures strongly depends on their chemical composition, content of reactive silica as well as the specific surface area. The micro- and nanosilica pozzolanic additives demonstrated the higher values of pozzolanic activity. Those activate the process of mineralization and are acting both as the cementitious admi

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23

Dong, Rong Zhen, Jun Wei, Yun Xuan Qi, et al. "Compensation Effect of Expansive Agent on Shrinkage of Self-Compacting Concrete." Applied Mechanics and Materials 507 (January 2014): 401–5. http://dx.doi.org/10.4028/www.scientific.net/amm.507.401.

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The compensation effect of expansive agent on shrinkage of self-compacting concrete (SCC) are studied. The deformation of Concrete was tested by concrete comparator, and the qualitative and quantitative analysis of hydration products were done by X-ray diffractometer (XRD). The results show that the dosages of mineral admixture and curing conditions affect the application results of expansive agents markedly. SCC samples containing expansive agent cured in the water are expanding within the test time. In the case of watering condition and natural curing condition, the samples are always shrink

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Rao, Meijuan, Jianpeng Wei, Zhiyang Gao, Wei Zhou, Qiaoling Li, and Shuhua Liu. "Study on Strength and Microstructure of Cement-Based Materials Containing Combination Mineral Admixtures." Advances in Materials Science and Engineering 2016 (2016): 1–10. http://dx.doi.org/10.1155/2016/7243670.

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The compressive strength of complex binders containing two or three blended mineral admixtures in terms of glass powder (GP), limestone powder (LP), and steel slag powder (SP) was determined by a battery solution type compressive testing machine. The morphology and microstructure characteristics of complex binder hydration products were also studied by microscopic analysis methods, such as XRD, TG-DTA, and SEM. The mechanical properties of the cement-based materials were analyzed to reveal the most appropriate mineral admixture type and content. The early sample strength development with GP wa

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25

Xu, De Jin, Chuan Qing Fu, Xian Yu Jin, Ye Tian, and Nan Guo Jin. "Experimental Study on Strength and Abrasion-Resistance Enhancement Admixture." Advanced Materials Research 250-253 (May 2011): 247–51. http://dx.doi.org/10.4028/www.scientific.net/amr.250-253.247.

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Cement concrete has an increasing utilization in highway construction. However, the lower flexural tensile strength and abrasion-resistance restricted the development of concrete pavement with heavy traffic. Hence, It has highlighted the need for research on high performance concrete (HPC). The design of specific concrete normally depends on the mixing of mineral admixtures in concrete mixture. This paper presents the first experimental study on strength and abrasion-resistance enhancement admixture (SAEA) mixed with slag powder, steel slag powder and silica fume. The optimal proportion of thr

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26

Felekoğlu, Burak. "Effects of PSD and surface morphology of micro-aggregates on admixture requirement and mechanical performance of micro-concrete." Cement and Concrete Composites 29, no. 6 (2007): 481–89. http://dx.doi.org/10.1016/j.cemconcomp.2006.12.008.

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Chen, Xupeng, Zhuowen Sun, and Jianyong Pang. "A Research on Durability Degradation of Mineral Admixture Concrete." Materials 14, no. 7 (2021): 1752. http://dx.doi.org/10.3390/ma14071752.

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In order to study the degradation laws and mechanisms of admixture concretes with single-added SO42− and composite of Mg2+ and SO42−, respectively, the durability tests were conducted on three types of mineral admixture concretes (concretes with single-added metakaolin (MK), single-added ultra-fine fly ash (UFA), and composite of metakaolin and ultra-fine fly ash (MF), and one reference concrete. In these tests, the 10% Na2SO4 solution and the 10% MgSO4 solution were used as the erosion medium, and the drying-wetting circle method was applied. It can be seen from the compressive tests and grey

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Yang, Qingguo, Nan Ru, Xuefeng He, and Yi Peng. "Mechanical Behavior of Refined SCC with High Admixture of Hybrid Micro- and Ordinary Steel Fibers." Sustainability 14, no. 9 (2022): 5637. http://dx.doi.org/10.3390/su14095637.

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The addition of steel fiber to self-consolidating concrete (SCC) may considerably prolong concrete cracking time and improve its deforming performance. Current studies mainly apply high content micro-steel fibers to improve the mechanical performance of SCC whilst assuring its workability, however, there are still very few studies concerning the influence of a mixture of a high content of micro-steel fibers with ordinary steel fibers on the performance of SCC. Thus, this paper conducted experimental studies on micro-steel fiber and ordinary-sized steel fiber hybrid reinforced self-consolidatin

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Fang, Yi, Jialai Wang, Xiaodong Wang, et al. "Bio-Based Admixture (Black Tea Extraction) for Better Performance of Metakaolin Blended Cement Mortars." Materials 15, no. 11 (2022): 3994. http://dx.doi.org/10.3390/ma15113994.

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With high pozzolanic reactivity, metakaolin (MK) is a popular supplementary cementitious material (SCM), which can be used to partially replace Portland cement in concretes. Due to its small particle size, however, MK can agglomerate, resulting in a nonuniform matrix and underperformance of the produced concrete. To address this issue, this paper exploits a low-cost, bio-based admixture—black tea extract (BTE)—to replace the traditional petroleum-based chemical admixture to enhance the dispersion and workability of MK blended cement mortars. Major biomolecules in the BTE such as caffeine, cate

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Wohlfahrt, Sören, Cassedyn Wirtz, and Dietmar Block. "Non-linear etch process of MF particles embedded in an rf plasma with oxygen admixture." Physics of Plasmas 29, no. 12 (2022): 123702. http://dx.doi.org/10.1063/5.0129509.

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Commonly used melamine formaldehyde micro-particles exposed to an rf discharge are known to be etched by a plasma as soon as an admixture of oxygen is present. By means of in situ high precision size measurements, the plasma–surface interaction is investigated. A comparison of experimental data, advanced Mie-scattering techniques, and a reaction rate model allows, for the first time, to quantitatively describe the etch process.

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Yuan, Wenhua, Lianjie Ji, Long Meng, Min Fang, and Xiangchi Zhang. "Influence of Mineral Admixtures on the Performance of Pervious Concrete and Microscopic Research." Buildings 14, no. 2 (2024): 533. http://dx.doi.org/10.3390/buildings14020533.

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Pervious concrete is an innovative eco-friendly construction material. Through the application of mineral admixtures and microscopic analysis to optimize its performance and analyze its mechanisms, its traits as a sustainable building option may be further improved. This study primarily examines the impact of the optimal blend quantities of fly ash, silica fume, and reinforcing agent on the attributes, micro-morphology, and phase composition of porous concrete. The optimal admixture was chosen after analyzing the effects of various factors on the mix ratio and properties of permeable concrete.

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Ding, Qing Jun, Xiu Lin Huang, and Hua Sun. "Study on the Hydration Micro-Structure and Properties of Complex Cementitious Systems." Advanced Materials Research 150-151 (October 2010): 783–87. http://dx.doi.org/10.4028/www.scientific.net/amr.150-151.783.

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In this study complex cementitious systems were prepared by cement, slag, fly ash and silica fume. Changing the dosages of mineral admixtures, then studying the strength and micro-structure of harden cement pastes by XRD,SEM,BET etc. Comparing the influence of variety and dosage of mineral admixture on cement pastes.Finally we found that mineral admixtures could improve the pore size distribution of cement pastes, and the total dosage 10% is better than 20%; and the "FA+SF" is better than others.

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Yao, Yan, Hao Wu, and Ling Wang. "The Microstructure Research on Interfacial Transition Zone of Filling Material Containing FA and Coal Gangue." Advanced Materials Research 287-290 (July 2011): 1125–29. http://dx.doi.org/10.4028/www.scientific.net/amr.287-290.1125.

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Interfacial transition zone (ITZ) is the weakest part in concrete structure because of the interrelation between its special characters and the performance of concrete, and adding mineral admixture in concrete is a feasible and effective way to improve ITZ. The workability, mechanical and durability performance of filling materials with Fly ash and Coal gangue has been invesitgated, and the interrelation has been research in a micro view by means of SEM and EDS.

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Rajagopal, M. R., Jyothikumari Ganta, and Yashwanth Pamu. "Enhancing the Strength and the Environmental Performance of Concrete with Pre-Treated Crumb Rubber and Micro-Silica." Recycling 9, no. 3 (2024): 32. http://dx.doi.org/10.3390/recycling9030032.

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Dumped non-biodegradable tires present a significant environmental threat, with overflowing landfills and associated health risks highlighting the urgency of tire waste disposal. Current disposal methods, such as stacking tires in open spaces, exacerbate the problem. The large-scale recycling of tire rubber waste offers environmental benefits. This study examines the effects of pre-treatment using NaOH and micro-silica as a mineral admixture on the mechanical strength of crumb rubber concrete (CRC) with partial replacement of natural sand. Samples of M20 and M30 grade were prepared with varyin

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Toropovs, Nikolajs, Diana Bajare, Genadijs Sahmenko, Linda Krage, and Aleksandrs Korjakins. "The Formation of Microstructure in High Strength Concrete Containing Micro and Nanosilica." Key Engineering Materials 604 (March 2014): 83–86. http://dx.doi.org/10.4028/www.scientific.net/kem.604.83.

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This article presents the results of microstructural investigation of high strength concrete containing microsilica and nanosilica (amorphous SiO2) as an active pozzolanic admixture. Micro and nanosilica react with calcium hydroxide producing calcium silicate hydrates (C-S-H), thus the voids and pores within concrete are filled and new minerals are formed in the gaps between cement grains and aggregate particles. Unreacted round microsilica and nanosilica particles were registered using SEM even in 6 month old samples. The compressive strength results indicate that concrete still continues to

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Praveen, K., Dhanya Sathyan, and K. M. Mini. "Study on performance of concrete with over-burnt bricks aggregates and micro-silica admixture." IOP Conference Series: Materials Science and Engineering 149 (September 2016): 012061. http://dx.doi.org/10.1088/1757-899x/149/1/012061.

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Chen, Xia, Xian Zhou, Ziling Peng, and Jiazheng Li. "Alkali-Active Sand Slate Powder for Use as Mineral Admixture in Mass Hydraulic Concrete: Technical and Economic Analysis." Advances in Materials Science and Engineering 2021 (November 29, 2021): 1–14. http://dx.doi.org/10.1155/2021/2725434.

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This work has launched a comprehensive investigation on the macro performance and micro structure of mass concrete produced with alkali-active sand slate powder (ASSP) for use as the mineral admixture and a thorough analysis on its technical and economic effects is also conducted. Results indicated ternary blend with hybrid of 5–8 wt.% silica fume (SF) and 15–20 wt.% ASSP has the optimal compressive and flexural strength. ASSP particle participates in hydration, accelerates hydration of cement clinker within 8.5 hours, and reduces the autogenous strain of pastes by 164 × 10−6 in case of dosage

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Yuvashri, B., A. Sattainathan Sharma, and K. Suganya Devi. "Study on Flexural Behaviour of High-Performance Concrete Beam Strengthened with Polyolefin Fibres." Journal of Physics: Conference Series 2040, no. 1 (2021): 012028. http://dx.doi.org/10.1088/1742-6596/2040/1/012028.

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Abstract This paper investigates the flexural behavior of high-performance concrete beams strengthened with polyolefin fibers. In the recent development in concrete technology, high-performance concrete is designed to give materials, exposure conditions, and applicable requirements of cost, better service life, and durability. The replacement of cement by adding the mineral admixture and chemical admixture to the concrete increases its strength and durability properties. To improve the strength and ductility of High-performance concrete, fibers are added to the concrete. This study focused on

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Bumanis, Girts, Laura Vitola, Xiangming Zhou, Danutė Vaičiukynienė, and Diana Bajare. "Towards 3D Pore Structure of Porous Gypsum Cement Pozzolan Ternary Binder by Micro-Computed Tomography." Journal of Composites Science 8, no. 7 (2024): 264. http://dx.doi.org/10.3390/jcs8070264.

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A sophisticated characterisation of a porous material structure has been challenging in material science. Three-dimensional (3D) structure analysis allows the evaluation of a material’s homogeneity, pore size distribution and pore wall properties. Micro-computed tomography (micro-CT) offers a non-destructive test method for material evaluation. This paper characterises a novel ternary binder’s porous structure using micro-CT. Gypsum–cement–pozzolan (GCP) ternary binders are low-carbon footprint binders. Both natural and industrial gypsum were evaluated as a major components of GCP binders. Por

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Sahmenko, Genadijs, Nikolajs Toropovs, Matiss Sutinis, and Janis Justs. "Properties of High Performance Concrete Containing Waste Glass Micro-Filler." Key Engineering Materials 604 (March 2014): 161–64. http://dx.doi.org/10.4028/www.scientific.net/kem.604.161.

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The article discusses possibilities for use fine ground glass obtained from fluorescent lamp utilisation as micro filler in High Performance Concrete (HPC). Investigated mix compositions are based on silica fume (SF) and SF combination with glass powder. Testing results indicates that replacing silica fume by additionally ground fluorescent glass (up to 50%) slightly increasing consumption of water and delaying setting time of cement paste. All HPC mixes with glass powder showing decreased early-age strength and considerable strength gain after long-term hardening. It is concluded, that the be

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Perfilov, V. A. "Modified Composite Fine-Grained Concrete." Defect and Diffusion Forum 410 (August 17, 2021): 829–34. http://dx.doi.org/10.4028/www.scientific.net/ddf.410.829.

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The paper presents the findings of the experimental investigation conducted to identify the effect of composite admixtures including a plastifying agent and soot production wastes on the proper-ties of fine grained concrete. The joint effect of the cement and sand matrix and soot wastes was investigated, too. The investigation identified the effect the complex admixture of a plastifying agent and soot wastes on structure formation, physical, mechanical properties and strength of the fine grained concrete. It was found that the micro particles of soot wastes concentrate the grains of the quartz

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Li, Zi Cheng, Ai Ju Zhang, Min Juan Zhou, and Shu Heng Qiu. "Effect of Co-Doped Steelmaking Slag and Fly Ash on Performance of Permeable Concrete." Advanced Materials Research 941-944 (June 2014): 751–55. http://dx.doi.org/10.4028/www.scientific.net/amr.941-944.751.

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The effect of steelmaking slag and fly ash as multi additives on permeability and mechanical properties of permeable concrete was investigated. The results show that multi binder with fly ash, steelmaking slag and cement has a significant impact on the permeability and compressive strength of permeable concrete specimen. When the co-doped admixture is added with fly ash (15 wt.% ) and steelmaking slag (10 wt.%), good mechanical properties and high permeability coefficient were obtained. Fly ash and steelmaking slag has a micro-aggregate filling effect on the concrete interface.

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Gadgihalli, Vishal, Ramya, Sindu Shankar, Raghavendra Prasad Dinakar, and Babitha Rani. "ANALYSIS OF PROPERTIES OF CONCRETE USING NYLON FIBER AS FIBER REIGNFORCEMENT ADMIXTURE." International Journal of Research -GRANTHAALAYAH 5, no. 4RASM (2017): 63–66. http://dx.doi.org/10.29121/granthaalayah.v5.i4rasm.2017.3371.

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As building industry evolves, stronger more durable and increasingly specialized products are in demand fiber reinforcement took an important role, fiber reinforcement to meet requirement changed with material composition and patterns such as fiber mesh, micro fibers, macro fibers, etc. In this paper analysis of properties of concrete using nylon fiber as fibre reinforcement admixture is studied and verified the strength of concrete to the normal Portland cement. Using nylon fiber the compressive strength and flexural of concrete has increased to very limited extend. As the friction between co

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Vishal, Gadgihalli, M. S. Ramya, Shankar Sindu, Prasad Havanje Dinakar Raghavendra, and Rani H. Babitha. "ANALYSIS OF PROPERTIES OF CONCRETE USING NYLON FIBER AS FIBER REIGNFORCEMENT ADMIXTURE." International Journal of Research - Granthaalayah 5, no. 4 RASM (2017): 63–66. https://doi.org/10.5281/zenodo.889525.

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As building industry evolves, stronger more durable and increasingly specialized products are in demand fiber reinforcement took an important role, fiber reinforcement to meet requirement changed with material composition and patterns such as fiber mesh, micro fibers, macro fibers, etc. In this paper analysis of properties of concrete using nylon fiber as fibre reinforcement admixture is studied and verified the strength of concrete to the normal Portland cement. Using nylon fiber the compressive strength and flexural of concrete has increased to very limited extend. As the friction between co

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Yergol, Rajashekar, and Lingaraj Shastri. "Strength Characteristic of Recycled Aggregate with Silica Fume As Admixture." International Journal of Innovative Technology and Exploring Engineering 10, no. 4 (2021): 243–46. http://dx.doi.org/10.35940/ijitee.d8549.0210421.

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In this study, conventional concrete is developed using recycled aggregates with micro silica (silica fume) as admixture. The concrete mix is designed for target strength of 25 MPa. Coarse aggregate were partially with recycled aggregate at 15 %, 30 % and 45 %. The relative parameters influencing the strength of concrete were studied in terms of recycled aggregate and silica content respectively. Test results reveled concrete produced with 45% of recycled aggregate tend to reduce the strength by 12% whereas addition of silica fume (10%) enhances the strength comparable to control mix (M25). Ad

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46

Mr., Rajshekhar Yergol, and Lingraj Shastri Dr. "Strength Characteristic of Recycled Aggregate with Silica Fume as Admixture." International Journal of Innovative Technology and Exploring Engineering (IJITEE) 10, no. 4 (2021): 243–46. https://doi.org/10.35940/ijitee.D8549.0210421.

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In this study, conventional concrete is developed using recycled aggregates with micro silica (silica fume) as admixture. The concrete mix is designed for target strength of 25 MPa. Coarse aggregate were partially with recycled aggregate at 15 %, 30 % and 45 %. The relative parameters influencing the strength of concrete were studied in terms of recycled aggregate and silica content respectively. Test results reveled concrete produced with 45% of recycled aggregate tend to reduce the strength by 12% whereas addition of silica fume (10%) enhances the strength comparable to control mix (M25). Ad

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Tu, Liu Qing, Zhong He Shui, Wen Bing Xu, Wei Chen, and Jun Tao Ma. "Effects of Restraint Condition on Carbonation of Concrete Containing Expansive Agent." Advanced Materials Research 378-379 (October 2011): 147–50. http://dx.doi.org/10.4028/www.scientific.net/amr.378-379.147.

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The concrete containing expansive agent, when limited, is affected by the addition of expansive admixture much, which influence the carbonation resistance. This article makes a comparison with anti-carbonation ability of concrete under restraint and non-restraint condition. The compressive strength and carbonation depth are tested, and the changes of micro-structure are also analyzed with TG-DSC and MIP analysis. The results reveal that single-dimensional restraint condition can efficiently improve the pore structure of concrete. And expansive agent also has a slight improvement to it. Single-

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Durumin-Iya, Sani Garba, Mohamad Zaky Noh, and Maryam Sanusi Adamu. "Influence of Modified Chemical Compositions on Palm Oil Fuel Ash to the Physico-Mechanical Properties of Porcelain." Key Engineering Materials 908 (January 28, 2022): 626–32. http://dx.doi.org/10.4028/p-mt927e.

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Palm oil fuel ash (POFA) is produced and disposed of by the palm oil industries as waste after burning palm fiber, husk, kernel, and shell as fuel to general electricity in-house. The aim of this research is to investigate the influence of modified chemical compositions on POFA on the physico-mechanical properties of porcelain. POFA was washed with 1, 2, and 3 Molar of HCl acid and heat treated. The powder was partially replaced with quartz at 15 wt.% and mixed in a ball mill machine for 12 hours. Modified POFA (admixture of CaO, Al2O3, MgO, P2O5, SiO2, and Fe2O3) was added to the porcelain co

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Vaiciukynienė, Danutė, Aras Kantautas, Gytis Krusinskas, Andrius Kielė, and Zymantas Rudzionis. "Influence of zeolitized perlite on blended cement properties." Chemical Industry and Chemical Engineering Quarterly 22, no. 3 (2016): 285–92. http://dx.doi.org/10.2298/ciceq150325042v.

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Perlite is the mineral of volcanic origin. Expanded perlite has good heat insulation and sound absorption properties. It is light, resistant to fire, moisture and micro-organisms, harmless to health. However, due to the presence of hyaline phase, its use in Portland cement mixture is problematic. In this paper, the zeolitization of expanded perlite was carried out to improve its hydraulic properties. The conversion of expanded perlite into zeolite material was carried out when Na2O : Al2O3 : SiO2 : H2O molar ratio was equal to 2: 1: 2: 10 and the suspension of starting materials was treated fo

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Ji, Xubo, Xiaozhong Gu, Zhuoran Wang, Shuai Xu, Haiqiang Jiang, and Erol Yilmaz. "Admixture Effects on the Rheological/Mechanical Behavior and Micro-Structure Evolution of Alkali-Activated Slag Backfills." Minerals 13, no. 1 (2022): 30. http://dx.doi.org/10.3390/min13010030.

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Recently, alkali-activated slag (AAS) has attracted extensive attention in cemented paste backfill (CPB) due to its low cost/CO2 emissions and high strength benefits. However, a comprehensive analysis of the mechanical/rheological behavior and microstructure evolution of AAS-CPB using mineral admixtures is still lacking. In this study, metakaolin (MK), fly ash (FA), and silica fume (SF) were employed to replace ground granulated blast furnace slag (GGBS) at various levels to formulate an alkali-activated binder, and the corresponding mechanical, rheological, and microstructure properties of CP

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