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Journal articles on the topic 'Hydration of portland cement'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

McDonald, Lewis, Fredrik Glasser, and Mohammed Imbabi. "A New, Carbon-Negative Precipitated Calcium Carbonate Admixture (PCC-A) for Low Carbon Portland Cements." Materials 12, no. 4 (2019): 554. http://dx.doi.org/10.3390/ma12040554.

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The production of Portland cement accounts for approximately 7% of global anthropogenic CO2 emissions. Carbon CAPture and CONversion (CAPCON) technology under development by the authors allows for new methods to be developed to offset these emissions. Carbon-negative Precipitated Calcium Carbonate (PCC), produced from CO2 emissions, can be used as a means of offsetting the carbon footprint of cement production while potentially providing benefits to cement hydration, workability, durability and strength. In this paper, we present preliminary test results obtained for the mechanical and chemica

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2

Wang, Xiao Yong, Han Seung Lee, and Seung Min Lim. "Numerical Simulation of Autogenous Shrinkage of Eco-Friendly Blended Portland Cements Using a Multi-Component Hydration Model." Materials Science Forum 569 (January 2008): 261–64. http://dx.doi.org/10.4028/www.scientific.net/msf.569.261.

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Fly ash and granulated blast-furnace slag, which are used as blends of Portland cement, are waste materials produced in electric and energy industry. Due to excellent durability, low heat of hydration, energy-saving, resource-conserving, and generally less expensive than ordinary Portland cement, blends Portland cements is used increasingly in construction industry. Both ecology benefit and economic benefit can be achieved by using blended Portland cement. Addition of blended components to cement, especially such as fly ash or silica fume, will lead to a densification of the microstructure. Th

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3

Wang, Jia Chun. "Investigation of Hydration Heat of Slag in Portland Cement Environment." Advanced Materials Research 261-263 (May 2011): 431–35. http://dx.doi.org/10.4028/www.scientific.net/amr.261-263.431.

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The hydration of slag in Portland cement is studied by considering the interaction between the hydrations of slag and Portland cement clinker. The slag hydration heat value that the different dosage of slag is in Portland cement is measured with isothermal calorimetry method as quartz sand sample contrast. The kinetic analysis was used to obtain parameters, which were employed to find out the influence of the slag content on the reaction rate constant value. The reaction stages have been analyzed and explained in accordance with kinetic models. The model predictions show that as the slag propo

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4

Wang, Xiao Yong, Han Seung Lee, and Ki Bong Park. "Numerical Simulation of Heat Evolution of Eco-Friendly Blended Portland Cements Using a Multi-Component Hydration Model." Materials Science Forum 569 (January 2008): 257–60. http://dx.doi.org/10.4028/www.scientific.net/msf.569.257.

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With the development of concrete industry, the necessity for utilizing waste materials and decreasing overall energy consumption is becoming increasingly obvious. Fly ash and granulated blast-furnace slag, which are used as blends of Portland cement, are waste materials produced in electric and energy industry, and concretes made with them can have properties similar to ones made with pure Portland cement at lower cost per unit volume. By using blended Portland cement, both ecology benefit and economic benefit can be achieved. Due to the pozzolanic reaction between calcium hydroxide and blende

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Liu, Jun, Yun Zhang, Run Qing Liu, Fang Zhi Lin, and Zi Yan Huang. "Effect of Temperature on Hydration Performance of Portland Cement." Applied Mechanics and Materials 328 (June 2013): 863–66. http://dx.doi.org/10.4028/www.scientific.net/amm.328.863.

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The mechanical strength change trend of Portland cement at different temperatures (+5°C, 0°C,-5°C,-10°C) was researched, and hydration performance and slurry structure of Portland cement was studied. Results showed that hydration process of Portland cement didn't vary with the lowering of curing temperature, but each stage of hydration time extended. The temperature decrease prolonged formation time of hydration products, making the early microstructure to loose, produces more pores, and causes the early mechanical strength of Portland cement to decrease.

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6

MARUYAMA, Ippei, Takafumi NOGUCHI, and Tetsuro MATSUSHITA. "HYDRATION MODEL OF PORTLAND CEMENT." Journal of Structural and Construction Engineering (Transactions of AIJ) 70, no. 593 (2005): 1–8. http://dx.doi.org/10.3130/aijs.70.1_7.

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7

Yang, Hua Shan, Sheng Jin Tu, Yin Long Jin, and Wang Tao. "Performances of Belite-Rich Cement Concrete with Fly Ash and Phosphorous Slag Powder." Applied Mechanics and Materials 174-177 (May 2012): 1502–6. http://dx.doi.org/10.4028/www.scientific.net/amm.174-177.1502.

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This paper presents the results of laboratory and outdoor exposure site studies on belite-rich cement concrete with phosphorous slag powder and fly ash. The parameters studied included strength, hydration heat, ultimate elongation, Young’s modulus, and adiabatic in temperature. The experimental results showed that belite-rich cement resulted in a higher rate of strength development of mortar and concrete at later ages when compared with that of moderate-heat Portland cement. And the hydration heat of belite-rich cement is lower than that of reference. This is due to the different phase composi

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8

Gong, Yongfan, Jianming Yang, Haifeng Sun, and Fei Xu. "Effect of Fly Ash Belite Cement on Hydration Performance of Portland Cement." Crystals 11, no. 7 (2021): 740. http://dx.doi.org/10.3390/cryst11070740.

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Fly ash belite cement is a green, low carbon cementitious material, mainly composed of hydraulic minerals of dicalcium silicate and calcium aluminate. In this study, we used fly ash belite cement to control the setting time, hydration heat, strength, composition and microstructure of hydration products in Portland cement. Results showed that incorporating fly ash belite cement into Portland cement can shorten the setting time, accelerate hydration reaction speed, enhance early hydration heat release rate of silicate minerals and reduce total hydration heat. Moreover, replacing composite cement

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9

Huang, Hong Liang, Hui Fang Zhang, Fei Zhao, Xue Fei Li, and Yan Fang Li. "Analysis of Portland Cement Hydration Mechanism and its Material Applications in Engineering." Advanced Materials Research 578 (October 2012): 121–24. http://dx.doi.org/10.4028/www.scientific.net/amr.578.121.

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On the basis to clarify the Portland cement hydration mechanism, we have a brief analysis of research methods about Portland cement hydration mechanism, mainly including the hydration heat, ultrasonic method, resistivity method, mercury intrusion method, chemical combine method, CH quantitative measurement, X-ray diffraction method, scanning electron microscopy, providing a theoretical basis of Portland cement hydration mechanism and its material applications in engineering for further study and improvement.

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10

Bondarenko, N., D. Bondarenko, and E. Evtushenko. "STUDY OF THE CHEMICAL INTERACTION OF GLASS FIBER WITH CEMENT HYDRATION PRODUCTS." Bulletin of Belgorod State Technological University named after. V. G. Shukhov 5, no. 12 (2021): 119–25. http://dx.doi.org/10.34031/2071-7318-2020-5-12-119-125.

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Reinforcement of concrete with fiberglass improves the performance properties of concrete. The object of the study is fiberglass concrete, where Portland cement or alumina cement is used as a binder, and silica fiberglass is used as a filler. The chemical and phase compositions of Portland cement and alumina cement have been studied. The influence of the products of hydration of Portland cement and alumina cement on the chemical resistance of glass fiber has been investigated. The phase composition of Portland cement and alumina cement after hydration is studied using X-ray phase analysis. It

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11

Macijauskas, Mindaugas, and Albinas Gailius. "INFLUENCE OF CEMENT TYPE AND ADMIXTURES ON RHEOLOGICAL PROPERTIES OF CEMENT PASTE / CHEMINIŲ ĮMAIŠŲ POVEIKIS REOLOGINĖMS CEMENTO TEŠLOS SAVYBĖMS." Engineering Structures and Technologies 5, no. 4 (2014): 175–81. http://dx.doi.org/10.3846/2029882x.2014.912431.

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The article aims to research the influence of the chemical admixtures on the rheological properties of Portland cement paste and determine their impact on the effectiveness of hydration induction period. Materials used in the study: Portland cement CEM I 42.5 (N and R early strength), limestone Portland cement CEM II/A-LL 42.5 N, plasticizer Centrament N3, the latest generation superplasticizer MC-PowerFlow 3140 and water. Investigations focused on effects of Plasticizer and superplasticizer on water and cement (W/C) ratio and Portland cement paste flow characteristics. Portland cement pastes

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12

Wang, Xiao-Yong, and Ki-Bong Park. "Modeling of hydration reactions to predict the properties of slag blended concrete." Canadian Journal of Civil Engineering 41, no. 5 (2014): 421–31. http://dx.doi.org/10.1139/cjce-2013-0109.

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The granulated blast furnace slag is commonly blended with Portland cement or clinker to produce slag blended cement after being ground to the fineness comparable to Portland cement. Hydration of slag-blended cement is much more complex than that of ordinary Portland cement because of the mutual interactions between the cement hydration and the slag reaction. In this paper, by considering the production of calcium hydroxide in cement hydration and its consumption in the reaction of slag, a numerical procedure is proposed to simulate the hydration of concrete containing slag. The numerical proc

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13

Wang, Xiao Jun, Xiao Yao Wang, Hong Fei Zhu, and Xiao Ye Cong. "The Change of Silica Tetrahedron in Cement-Silica Fume Blends Hydration." Materials Science Forum 743-744 (January 2013): 280–84. http://dx.doi.org/10.4028/www.scientific.net/msf.743-744.280.

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The change of silica tetrahedron in cement-silica fume blends hydration is critical for blended cement application. 29Si solid-state magic angle spinning nuclear magnetic resonance (MAS NMR) investigations on the change of silica tetrahedron, which were Portland cement hydration, silica fume in simulated hydration and cement-silica fume blends hydration, were characterized and compared in this paper. The experimental results revealed that the amorphous silica tetrahedron structure in silica fume changed into Q1 and Q2 silica tetrahedrons, the same as silica-oxide structure of cohesive gel in t

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14

Li, Qiu, Andrew D. Deacon, and Nichola J. Coleman. "Iodoform-Blended Portland Cement for Dentistry." Prosthesis 2, no. 4 (2020): 277–96. http://dx.doi.org/10.3390/prosthesis2040025.

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Portland cement-based formulations blended with radiopacifying agents are popular endodontic materials for various root filling and pulp capping applications. Iodoform (CHI3) is an alternative candidate radiopacifier whose impact on the setting, bioactivity, antimicrobial properties and cytotoxicity of white Portland cement were evaluated in this study. Isothermal conduction calorimetry and 29Si magic angle spinning nuclear magnetic resonance spectroscopy (MAS NMR) showed that 20 wt% iodoform had no significant impact on the kinetics of cement hydration with respect to the formation of the maj

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15

Singh, Jagmeet, Jaspal Singh, and Manpreet Kaur. "Copper Slag Blended Cement: An Environmental Sustainable Approach for Cement Industry in India." Current World Environment 11, no. 1 (2016): 186–96. http://dx.doi.org/10.12944/cwe.11.1.23.

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Indian cement industry is facing environmental issue of emission of carbon dioxide (CO2), a greenhouse gas. Blended cements including supplementary cementitious materials are substitute of Portland cement to reduce CO2 emission. The present paper investigates theappropriateness of copper slag (CS) as supplementary cementitious material. Strength properties and hydration of mixes were determined at different replacement levels of CS with cement. Compressive, flexural and tensile strength of each mix was found out at different curing periods. The hydration of cement was investigated through X-ra

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16

Durczak, Karol, Michał Pyzalski, Krzysztof Pilarski, Tomasz Brylewski, and Agnieszka Sujak. "The Effect of Liquid Slurry-Enhanced Corrosion on the Phase Composition of Selected Portland Cement Pastes." Materials 14, no. 7 (2021): 1707. http://dx.doi.org/10.3390/ma14071707.

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This paper presents the scientific problem of the biological corrosion of Portland cements and its effects on the phase composition of cement pastes after the corrosion process in the environment of reactive media from the agricultural industry. Seven Portland cements produced from different cement plants exposed to pig slurry and water as a reference medium for a period of six weeks were tested. After the exposure process in both of the above-mentioned reaction environments, the hydrating cement pastes were characterized in terms of their phase composition using the XRD method and were also s

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17

Zhao, Zhi Man, Qian Wang, Chun Jie Wang, and Xiao Mei Zhang. "On Study of Development Expansive Coal Gangue Portland Cement by Microwave Technology." Advanced Materials Research 671-674 (March 2013): 1909–13. http://dx.doi.org/10.4028/www.scientific.net/amr.671-674.1909.

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Added carbon powder or M mineral powder in unburned kaolinite coal gangue, the mixtures could be changed better expansive mineral additive of Portland cement by microwave irradiation. The microwave activation coal gangue mixtures 5%, 10%, 15%, 20%, 25%, 30% and 35% (by weight) were respectively added intoⅠ42.5 Portland cement. The compressive/flexural strength of various expansive coal gangue Portland cements were determined after 3 and 28 day. The fineness, initial and final setting time, soundness and volume expansive ratio was also measured. The expansive reasons of coal gangue Portland cem

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18

Liu, Zhuangzhuang, Wenxiu Jiao, Aimin Sha, Jie Gao, Zhenqiang Han, and Wei Xu. "Portland Cement Hydration Behavior at Low Temperatures: Views from Calculation and Experimental Study." Advances in Materials Science and Engineering 2017 (2017): 1–9. http://dx.doi.org/10.1155/2017/3927106.

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Environmental condition affects the property of construction materials. This study gives an initial understanding of Portland cement hydration under low temperatures from the views of laboratory experiments (including electrical resistivity, degree of hydration (DoH), and maturity) as well as thermodynamic calculation. The hydrates of Portland cement at the given period were detected with X-ray diffraction (XRD), and their microstructure was observed by scanning electron microscope (SEM). Experiment result (i.e., DoH and electrical resistivity) indicated that the hydration of Portland cement w

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19

Gazdič, Dominik, Marcela Fridrichová, and Iveta Hájková. "Study of Increasing of Belite Reactivity." Advanced Materials Research 897 (February 2014): 9–12. http://dx.doi.org/10.4028/www.scientific.net/amr.897.9.

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Within the research at Institute of Technology of Building Materials and Components the questions of belite cement hydration speed improvement have been solved for a long time. In comparison with common Portland cements (alite type) these cements obtain almost identical final properties but the main shortage of them due to which they are not practically produced is their very low hydration process speed and thus insufficient initial strength for construction practice. A development of lower hydration heat is another difference of the belite cement from common Portland cements. In case of concr

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20

Trník, Anton, Lenka Scheinherrová, Tereza Kulovaná, et al. "Thermogravimetry of Portland Cement from Argentina and Czech Republic." Advanced Materials Research 1126 (October 2015): 169–73. http://dx.doi.org/10.4028/www.scientific.net/amr.1126.169.

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We study the hydration and pozzolanic reactions of cement pastes made from Argentinian and Czech Portland cements as a function of age, using thermogravimetry. The measurements are done for 2, 7, 28, and 90 days cured samples in order to monitor the rate of hydration. The investigation is performed in the temperature range from 25 °C to 1000 °C with a heating rate 5 °C/min in an argon atmosphere. The mass change during the decomposition of calcium silicate hydrate gels, portlandite, and calcite are determined, and the changes in the portlandite amount are estimated in dependence on the time of

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21

Bach, Quoc Si. "Investigation of Blended Cement Hydration in the Reactive Powder Concrete with Increasing Levels of Silica Fume Addition." Applied Mechanics and Materials 889 (March 2019): 304–12. http://dx.doi.org/10.4028/www.scientific.net/amm.889.304.

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Hydration is a chemical reaction in which the major compounds in cement form chemical bonds with water molecules and become hydration products. By the process of hydration Portland cement mixed with sand, gravel and water produces the synthetic rock we call concrete. The Therefore, the concrete properties always accompanies with the hydration degree of cement. This paper presents some experimental test results on how silica fume affects the cement hydration in cement pastes of the Reactive Powder Concrete as increasing levels of silica fume addition with the content from 0% to 30% of cement ma

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22

Luo, Li, Yimin Zhang, Shenxu Bao, and Tiejun Chen. "Utilization of Iron Ore Tailings as Raw Material for Portland Cement Clinker Production." Advances in Materials Science and Engineering 2016 (2016): 1–6. http://dx.doi.org/10.1155/2016/1596047.

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The cement industry has for some time been seeking alternative raw material for the Portland cement clinker production. The aim of this research was to investigate the possibility of utilizing iron ore tailings (IOT) to replace clay as alumina-silicate raw material for the production of Portland cement clinker. For this purpose, two kinds of clinkers were prepared: one was prepared by IOT; the other was prepared by clay as a reference. The reactivity and burnability of raw meal, mineralogical composition and physical properties of clinker, and hydration characteristic of cement were studied by

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23

MacTavish, J. C., L. Miljković, L. J. Schreiner, M. M. Pintar, R. Blinc, and G. Lahajnar. "A Study of Portland Cement Hydration by Paramagnetic Iron Suppression of Proton Magnetic Resonance." Zeitschrift für Naturforschung A 40, no. 1 (1985): 32–36. http://dx.doi.org/10.1515/zna-1985-0107.

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The dynamics of the hydration of a white cement with negligible iron content and of Portland cement with a considerable amount of iron has been studied by proton magnetic resonance. The presence of iron in Portland cement results in the protons close to the free electron spins of iron being out of resonance and their signal being suppressed. The evolution in time of the percentage of protons out of resonance in a Portland cement and the growth of the solid component have been determined as a function of hydration time.

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24

Gao, Chao, Shao Xia Gao, and Hong Zhou Chen. "The Influence of WH-II Super Set-Retarding Agent on the Heat of Hydration and Indices of Portland Cement." Advanced Materials Research 199-200 (February 2011): 1684–92. http://dx.doi.org/10.4028/www.scientific.net/amr.199-200.1684.

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This paper study on effects of WH-Ⅱ super set-retarding agent on the hydration,the heat of hydration,the setting time and strength of Portland cement The author does test on the hydration with the methods of XRD and SEM.The results show that fitful amount of WH-Ⅱ super set-retarding agent is effective on retarding the setting time and improving the strength of Portland cement.

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25

Zapała-Sławeta, Justyna, and Zdzisława Owsiak. "The impact of lithium nitrate on the physical and mechanical properties of Portland cement)." MATEC Web of Conferences 163 (2018): 04002. http://dx.doi.org/10.1051/matecconf/201816304002.

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The effectiveness of lithium nitrate as a chemical additive which reduces the negative effects of alkali aggregate reaction was subject to research by scientists in many centres around the world. The literature data on the impact of lithium nitrate on the physical and mechanical properties of cements are rare. Without a precise definition of the impact of lithium nitrate on the cement properties, it is extremely hard to determine its real advantages in practical usage. In this paper, studies were undertaken to assess the impact of LiNO3 on the properties of pastes and mortars with Portland cem

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26

Liu, Reng Guang, and Pei Yu Yan. "Study on Hydration Degree of Portland Cement-Slag Complex Binders." Key Engineering Materials 539 (January 2013): 172–77. http://dx.doi.org/10.4028/www.scientific.net/kem.539.172.

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Abstract. The hydration degree of Portland cement-slag complex binders was investigated by hydration heat, chemically bound water amount, EDTA selective dissolution and mortar compressive strength. Different hydration degree of complex binders was obtained with different methods. Hydration heat and EDTA method indicated that reaction degree of slag was much lower than cement and the total reaction degree of complex binders was also lower than neat cement. However, chemically bound water amount and mortar compressive strengths of complex binders blended with slag within certain limit were highe

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27

Davidová, Vendula, and Pavel Reiterman. "AUTOGENOUS SHRINKAGE OF COMPOSITES BASED ON PORTLAND CEMENT." Acta Polytechnica CTU Proceedings 22 (July 25, 2019): 22–25. http://dx.doi.org/10.14311/app.2019.22.0022.

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Autogenous shrinkage of cement based composites is important property influencing number of their engineering application. Its ultimate value is predominantly determined by mineralogical composition of cement and its particle size distribution. Present paper introduces experimental study focused on the evaluation of various cements of grade CEM I 42.5 produced in Czech Republic in terms of shrinkage under autogenous conditions. Selected cement type is currently the most frequently used cement. Conducted study confirmed essential differences in ultimate values of shrinkage, which is partially d

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Meden, Anton, Simona Medvescek, and Venceslav Kaucic. "Influence of Various Carbonates on the Hydration of Portalnd Cement." Acta Crystallographica Section A Foundations and Advances 70, a1 (2014): C1770. http://dx.doi.org/10.1107/s2053273314082291.

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Over the last 20 years, the effects of using limestone in Portland cement (PC) have been well studied. The benefits of limestone as a partial replacement for PC are well established. Its economic and environmental advantages of reducing CO2 emissions are well known. For a long time, the limestone has been considered as an inert filler. Recently it has been concluded that limestone serves both as an inert filler and also reacts to a limited extend. The reactivity depends on its fineness (specific surface)[1] and content [2,3]. The question arose, whether a) it is the availability of excess carb

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29

Li, Duan-le, Da-peng Zheng, Dong-min Wang, Ji-hui Zhao, Cheng Du, and Cai-fu Ren. "Influence of Organic Esters on Portland Cement Hydration and Hardening." Advances in Materials Science and Engineering 2018 (2018): 1–10. http://dx.doi.org/10.1155/2018/3203952.

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This paper investigated the effect of organic compounds with ester groups on the hydration and hardening of cement. The effects of five kinds of organic compounds with ester groups (ethyl acetate, dimethyl oxalate, glyceryl triacetate, trimethyl phosphate, and triethanolamine borate) on hydration heat, hydration degree, setting time, mechanical properties, microstructure, and pore structure of hardened cement slurry were studied. The test results showed that esters can make the end time of cement hydration induction longer and delay the occurrence of the second exothermic peak. Also, the effec

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Li, Yang, Hui Zhang, Minghui Huang, et al. "Influence of Different Alkali Sulfates on the Shrinkage, Hydration, Pore Structure, Fractal Dimension and Microstructure of Low-Heat Portland Cement, Medium-Heat Portland Cement and Ordinary Portland Cement." Fractal and Fractional 5, no. 3 (2021): 79. http://dx.doi.org/10.3390/fractalfract5030079.

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In cement-based materials, alkalis mainly exist in the form of different alkali sulfates. In this study, the impacts of different alkali sulfates on the shrinkage, hydration, pore structure, fractal dimension and microstructure of low-heat Portland cement (LHPC), medium-heat Portland cement (MHPC) and ordinary Portland cement (OPC) are investigated. The results indicate that alkali sulfates magnify the autogenous shrinkage and drying shrinkage of cement-based materials with different mineral compositions, which are mainly related to different pore structures and hydration processes. LHPC has t

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Nunes, Teresa G. "Influence of Grain Size on the Setting of Portland Cement: A Stray-Field Magnetic Resonance Imaging Study." Materials Science Forum 514-516 (May 2006): 1633–37. http://dx.doi.org/10.4028/www.scientific.net/msf.514-516.1633.

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A number of failures of large concrete structures during construction have been reported in the last decades [1]. The overestimation of concrete strength at early ages was one of the reasons for the failures. Consequently, reliable information about early age properties of the material is essential to guarantee life-time performance of structures. Portland cement is a complex heterogeneous particulate material and a full knowledge of kinetics of the hydration reactions, for example, is still missing. Gel constitutes the major phase in the hardening cement paste and the corresponding structure

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Sobol, Khrystyna, Taras Markiv, Volodymyr Terlyha, and Wojciech Franus. "Peculiarities of hydration processes of cements containing natural zeolite." Budownictwo i Architektura 14, no. 1 (2015): 105–13. http://dx.doi.org/10.35784/bud-arch.1674.

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In this study, properties and peculiarities of hydration processes as well as paste microstructure of blended cements containing 10% by weight of natural zeolite were investigated. Free calcium hydroxide content, crystalline hydration products and microstructural architecture of hydrated cement pastes were examined by physical and chemical methods. It was found that the addition of natural zeolite provides formation of an extra amount of fine crystalline ettringite and tobermorite-like calcium hydrosilicates of CSH (B) type in the mineral non-clinker part of Portland cement resulting in streng

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Oliveira, Danielle Nascimento Silva, Ulisses Targino Bezerra, S. L. D. Beltrão, Alexsandra C. Chaves, Ana M. G. D. Mendonça, and Gelmires Araújo Neves. "Oil Well Cement Developed from Common Cement: Physical, Chemical and Mineral Characterization." Materials Science Forum 805 (September 2014): 558–63. http://dx.doi.org/10.4028/www.scientific.net/msf.805.558.

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This study aims to characterize a new type of cement, produced from the mixture of common Portland cements, which could be used as an option in the cementing of oil wells. To enable this study a linear programming method was used for the composition of the new cement, then, characterization tests were performed through particle size analysis by laser diffraction, chemical analysis by EDX, thermogravimetric analysis, X-ray diffraction, setting time, compressive strength. The results allowed the conclusion that the new formulated cement presented low C3A content, time setting superior to the Por

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Singh, N. B., V. D. Singh, and Sarita Rai. "Hydration of bagasse ash-blended portland cement." Cement and Concrete Research 30, no. 9 (2000): 1485–88. http://dx.doi.org/10.1016/s0008-8846(00)00324-0.

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35

Parrott, Leslie J., Mette Geiker, Walter A. Gutteridge, and David Killoh. "Monitoring Portland cement hydration: Comparison of methods." Cement and Concrete Research 20, no. 6 (1990): 919–26. http://dx.doi.org/10.1016/0008-8846(90)90054-2.

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36

Scrivener, Karen L., Patrick Juilland, and Paulo J. M. Monteiro. "Advances in understanding hydration of Portland cement." Cement and Concrete Research 78 (December 2015): 38–56. http://dx.doi.org/10.1016/j.cemconres.2015.05.025.

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Hájková, Iveta, Karel Dvořák, Dominik Gazdič, and Marcela Fridrichová. "Technological Properties Testing of Blended Portland Cements with Fluidized Filter Ash." Materials Science Forum 865 (August 2016): 27–31. http://dx.doi.org/10.4028/www.scientific.net/msf.865.27.

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The work aims to study the behaviour of blended cement with fluidized filter ash (FFA) considering to formation of the increased proportion of ettringite and its eventual transformation into thaumasite. In part of an experiment there were prepared three cements, two of them served as a reference one-component and the reference blended cement with limestone, a third one was tested blended cement with a FFA. All three cements were put to determination of basic technological properties and next they were observed during hydration process.

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Ukrainczyk, Neven, Jure Zlopasa, and Eduard Koenders. "Hydration Process of Portland Cement Blended with Silica Fume." Advanced Materials Research 699 (May 2013): 578–83. http://dx.doi.org/10.4028/www.scientific.net/amr.699.578.

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The enormous carbon footprint associated with the global cement production (5-7%) asks for a radical change in the use of sustainable replacement materials in concrete. Replacement of cement by pozzolanic waste materials, being a by-product from industrial processes, has been widely recognized as the most promising route towards sustainable construction materials. This paper presents experimental study on hydration of commercial Portland cement blended with silica fume in replacement ratio of 15 mass %. Isothermal calorimetry was employed to monitor the hydration kinetics. Thermogravimetric an

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Wang, Wei, Wu Yao, and Yong Qi Wei. "Study on the Hydration Kinetics of Portland Cement." Key Engineering Materials 539 (January 2013): 30–34. http://dx.doi.org/10.4028/www.scientific.net/kem.539.30.

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A kinetic model originally developed by Tomosawa is analyzed for the hydration of Portland cement. The complicated kinetic equation of Tomosawa model is transformed into three simple equations of simplified model which represent mass transfer, phase-boundary reaction and diffusion process at different stage, respectively. Based on the isothermal calorimetry and the simplified model, the relationship between the degree of reaction and reaction rate is discussed. The derived result could reflect the development of degree of reaction and reaction rate during the cement hydration. The calculation

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Liu, Peng, Zhi Wu Yu, Ling Kun Chen, and Zhu Ding. "Study on Hydration Mechanism of Phosphoaluminate Cement." Materials Science Forum 675-677 (February 2011): 701–4. http://dx.doi.org/10.4028/www.scientific.net/msf.675-677.701.

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Phosphoaluminate cement (PAC) is a kind of new cementitious material which has many special properties compared to Portland cement (PC). PAC sets quickly and develops early-high strength. In order to investigate the hydration mechanism, the hydration products and microstructure of PAC were studied with x-ray diffraction (XRD), electron scanning microscope (SEM) and electrochemical impedance spectroscopy (EIS). Heat evolution of PAC was also measured. The results show that the hydration mechanism of PAC is different from Portland cement, which is caused by the special minerals including CxP, CA

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Wang, Bing Wen, Yun Bing Hou, Zhi Hua Zhai, and Shuai Jie Han. "Durability of Bittern-Resisting Cement in High Concentration Brine." Advanced Materials Research 197-198 (February 2011): 972–76. http://dx.doi.org/10.4028/www.scientific.net/amr.197-198.972.

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Bittern-resisting cement (BR) has more excellent performance to resist physical attack and chemical corrosion in high-concentration brine environment than ordinary Portland cement or sulfate- resisting Portland cement. The durability and chemical stability of bittern-resisting cement are studied under drying-wetting cycles in brine, the microstructure and chemical component of hydration products also are determined by SEM/EDXA. The corrosion resistance coefficient Kf of BR mortar prisms in high-concentration brine for 6 months is over 96%, and the mass loss of mortar prisms after 30 drying-wet

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Kolářová, Iva, Pavel Šiler, and František Šoukal. "The Influence of Zinc on the Hydration and Compressive Strength of Portland Cement." Advanced Materials Research 1000 (August 2014): 43–46. http://dx.doi.org/10.4028/www.scientific.net/amr.1000.43.

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The aim of this work was to investigate the effect of addition of elements present in secondary raw materials on the hydration and compressive strength of Portland cement. Ordinary Portland cement (OPC) has been used to solidify hazardous waste for about 25 years and the effect of waste components on the hydraulic activity is an interesting object for the research. In this study Zn nitrate, chloride and oxide were added to Portland cement. The concentrations of 0.1 and 1.0 weight percent of zinc in cement were tested. After 1, 7 and 28 days the compressive strength was reduced or similar by th

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Abzaev, Yurii, Aleksei Gnyrya, Sergei Korobkov, Danil Dudov, Dmitrii Mihailov, and Bogdan Vodnev. "In-situ curing mechanism of Portland cement." EPJ Web of Conferences 221 (2019): 01001. http://dx.doi.org/10.1051/epjconf/201922101001.

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The paper presents the results of predictive modelling of the curing mechanism of the type CEM I 42.5B Portland cement using the VCCTL tool. The curing lasts during 28 days at 20 оС and the water-cement (W/C) ratio of 0.26, 0.30, 0.35 and 0.40. It is shown that the degree of Portland cement hydration is ~0.70 after 28-day curing. The growth in the W/C ratio significantly intensifies the hydration rate and the dissolution of clinker minerals. The amount of the main hydration products calcium silicate hydrate (C-S-H) and portlandite considerably increases with the W/C ratio. In Portland cement,

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Li, Xiang Guo, Xiao Bo Yin, Bao Guo Ma, Bei Wu, Quanbin Chen, and Yang Lv. "Investigation on Hydration Characteristics of Zinc-Doped Portland Cement Pastes." Advanced Materials Research 168-170 (December 2010): 623–27. http://dx.doi.org/10.4028/www.scientific.net/amr.168-170.623.

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Compressive strength, setting time, hydration heat and hydration product were investigated to evaluate the effects of Zn2+ ion concentrations and the anion of zinc salts on the hydration characteristics of Portland cement paste. The results show that the hydration characteristics of zinc-doped cement pastes depend on Zn2+ ion concentrations and the anion of salts. With the incorporation of ZnCl2, the hydration heat, exothermic rate and the early-age strength of cement pastes were reduced, the arrival time of the highest temperature was delayed, and little negative influences on the compressive

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Gong, Yongfan, Cong Liu, and Yanli Chen. "Properties and Mechanism of Hydration of Fly Ash Belite Cement Prepared from Low-Quality Fly Ash." Applied Sciences 10, no. 20 (2020): 7026. http://dx.doi.org/10.3390/app10207026.

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Fly ash belite cement (FABC) is predominantly composed of α′L-C2S and C12A7. It is prepared from low-grade fly ashes by hydrothermal synthesis and low-temperature calcination methods. The formation, evolution process, and microstructure of FABC hydration productions were studied in this work, and the ultimate aim is to give a theoretical foundation and technological support for the application of the new cementitious material made of low-quality fly ash. The results showed that the optimal amount of gypsum was about 7% of cement by weight. The 3-day and 28-day compressive strength of cement pa

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Davidová, Vendula, and Pavel Reiterman. "SHRINKAGE OF VARIOUS TYPES OF PORTLAND CLINKER-BASED CEMENTS WITH RESPECT TO THEIR HYDRATION DEGREE." Acta Polytechnica 60, no. 2 (2020): 88–97. http://dx.doi.org/10.14311/ap.2020.60.0088.

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The volume changes of cement based composites are significantly exhibited in the hardening process. Initial phases of the hardening are complemented by the expansion due to the heat evolution that is subsequently alternated by the shrinkage. Both could cause a crack initiation. It is evident that ultimate volume changes of cement based composites are a complex process, because the final shrinkage is determined by the binder used, exposition and also by the previous history. The paper focuses on the evaluation of the main types of cements based on the Portland clinker by using a conventional pr

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FS, Hashem, Eisa E. Hekal, and Abdel M Wahab. "Effect propylene glycol as a quality improvers for Portland and Portland-limestone cements." International Journal of Petrochemical Science & Engineering 4, no. 1 (2019): 1–7. http://dx.doi.org/10.15406/ipcse.2019.04.00096.

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The performance of propylene glycol (PG) on the grindability, setting and hardening of Portland (OPC) and Portland-Limestone cements (PLC) was studied. Propylene glycol was added to OPC clinker with percentage ratios; 0, 0.03, 0.04 and 0.05 wt.% of the OPC clinker. PLC was made by replacing 5 and 10 wt. % of OPC with limestone. PG offers better grinding aid performance with higher Blaine areas. Besides, presence of PG shows higher water of consistency and lower initial and final setting times. The mechanical properties of mortar specimens made from OPC and PLC admixed with PG were improved esp

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FS, Hashem, Eisa E. Hekal, and Abdel M Wahab. "Effect propylene glycol as a quality improvers for Portland and Portland-limestone cements." International Journal of Petrochemical Science & Engineering 4, no. 1 (2019): 1–7. http://dx.doi.org/10.15406/ipcse.2019.04.00096.

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The performance of propylene glycol (PG) on the grindability, setting and hardening of Portland (OPC) and Portland-Limestone cements (PLC) was studied. Propylene glycol was added to OPC clinker with percentage ratios; 0, 0.03, 0.04 and 0.05 wt.% of the OPC clinker. PLC was made by replacing 5 and 10 wt. % of OPC with limestone. PG offers better grinding aid performance with higher Blaine areas. Besides, presence of PG shows higher water of consistency and lower initial and final setting times. The mechanical properties of mortar specimens made from OPC and PLC admixed with PG were improved esp

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Zhao, Quan, Jianwei Tu, Weiwei Han, Xi Wang, and Youzhi Chen. "Hydration Properties of Portland Cement Paste with Boron Gangue." Advances in Materials Science and Engineering 2020 (March 16, 2020): 1–9. http://dx.doi.org/10.1155/2020/7194654.

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In order to prepare a good radiation shielding concrete with a proper setting time and a high strength, the hydration properties of cement with boron gangue were investigated by the methods of XRD, isothermal microcalorimetry, TG/DSC, and FTIR. The results demonstrated that it was mainly related to the insoluble matter CaB2O4·4H2O and Ca(H2BO3)2·4H2O that boron gangue could severely inhibit the cement hydration. Boron gangue made a significant retardation on Portland cement hydration with the form of BO33− and BO45−, which caused an obvious retardation of C3A and C3S hydration with an insolubl

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Trauchessec, R., J. M. Mechling, A. Lecomte, A. Roux, and B. Le Rolland. "Hydration of ordinary Portland cement and calcium sulfoaluminate cement blends." Cement and Concrete Composites 56 (February 2015): 106–14. http://dx.doi.org/10.1016/j.cemconcomp.2014.11.005.

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