Time-dependent retardation effect of epoxy latexes on cement hydration: Experiments and multi-component hydration model

2022 ◽  
Vol 320 ◽  
pp. 126282
Author(s):  
Pengfei Li ◽  
Zhengshi Jiang ◽  
Xuehui An ◽  
Koichi Maekawa ◽  
Sanlin Du
Keyword(s):  
Cement Hydration ◽  
Time Dependent ◽  
Retardation Effect ◽  
Hydration Model

Modeling of hydration reactions to predict the properties of slag blended concrete

2014 ◽  
Vol 41 (5) ◽  
pp. 421-431
Author(s):  
Xiao-Yong Wang ◽  
Ki-Bong Park
Keyword(s):  
Portland Cement ◽  
Cement Hydration ◽  
Blended Cement ◽  
Numerical Procedure ◽  
Reaction Model ◽  
Heat Evolution ◽  
Mineral Admixture ◽  
Temperature History ◽  
Granulated Blast Furnace Slag ◽  
Hydration Model

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 procedure includes two sub components, a cement hydration model and a slag reaction model. The heat evolution rate of slag concrete is determined from the contributions of the cement hydration and the slag reaction. Furthermore, the temperature history in hardening blended concrete is evaluated by combining the proposed numerical procedure with a finite element method. The proposed model is verified through experimental data on concrete with different water–cement ratios and mineral admixture substitution ratios.

scholarly journals Predictive Hydration Model of Portland Cement and Its Main Minerals Based on Dissolution Theory and Water Diffusion Theory

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 595
Author(s):  
Tianqi Qi ◽  
Wei Zhou ◽  
Xinghong Liu ◽  
Qiao Wang ◽  
Sifan Zhang
Keyword(s):  
Portland Cement ◽  
Cement Hydration ◽  
Diffusion Theory ◽  
Moisture Diffusion ◽  
Test Results ◽  
Cement Slurry ◽  
Element Analysis ◽  
Prediction Ability ◽  
Hydration Effect ◽  
Hydration Model

Efficient and accurate cement hydration simulation is an important issue for predicting and analyzing concrete’s performance evolution. A large number of models have been proposed to describe cement hydration. Some models can simulate the test results with high accuracy by constructing reasonable functions, but they are based on mathematical regression and lack of physical background and prediction ability. Other models, such as the famous HYMOSTRUC model and CEMHYD3D model, can predict the hydration rate and microstructure evolution of cement based on its initial microstructure. However, this kind of prediction model also has some limitations, such as the inability to fully consider the properties of cement slurry, or being too complicated for use in finite element analysis (FEA). In this study, the hydration mechanisms of the main minerals in Portland cement (PC) are expounded, and the corresponding hydration model is built. Firstly, a modified particle hydration model of tricalcium silicate (C3S) and alite is proposed based on the moisture diffusion theory and the calcium silicate hydrate (C-S-H) barrier layer hypothesis, which can predict the hydration degree of C3S and alite throughout the age. Taking the hydration model of C3S as a reference, the hydration model of dicalcium silicate (C2S) is established, and the synergistic hydration effect of C3S and C2S is calibrated by analyzing the published test results. The hydration model of tricalcium aluminate(C3A)-gypsum system is then designed by combining the theory of dissolution and diffusion. This model can reflect the hydration characteristics of C3A in different stages, and quantify the response of the hydration process of C3A to different gypsum content, water–cement ratio, and particle size distribution. Finally, several correction coefficients are introduced into the hydration model of the main mineral, to consider the synergistic hydration effect among the minerals to some extent and realize the prediction of the hydration of PC.

Retardation effect of styrene-acrylate copolymer latexes on cement hydration

2015 ◽  
Vol 75 ◽  
pp. 23-41 ◽  
Author(s):  
Xiangming Kong ◽  
Sebastian Emmerling ◽  
Joachim Pakusch ◽  
Markus Rueckel ◽  
Jörg Nieberle
Keyword(s):  
Cement Hydration ◽  
Retardation Effect ◽  
Acrylate Copolymer

The Retardation Effect of Super-Retarding Polycarboxylate-Type Superplasticizer on Cement Hydration

2012 ◽  
Vol 38 (3) ◽  
pp. 571-577
Author(s):  
Fang-Xian Li ◽  
You-Zhi Chen ◽  
Shi-Zong Long ◽  
Qi-Jun Yu
Keyword(s):  
Cement Hydration ◽  
Retardation Effect

scholarly journals A Simple Cement Hydration Model Considering the Influences of Water-to-Cement Ratio and Mineral Composition

2021 ◽  
Vol 127 (3) ◽  
pp. 1059-1067
Author(s):  
Baoyu Ma ◽  
Guansuo Dui ◽  
Zhenglin Jia ◽  
Bo Yang ◽  
Chunyan Yang ◽  
...  
Keyword(s):  
Mineral Composition ◽  
Cement Hydration ◽  
Cement Ratio ◽  
Water To Cement Ratio ◽  
Hydration Model

scholarly journals Prediction of Time-Dependent Chloride Diffusion Coefficients for Slag-Blended Concrete

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Ki-Bong Park ◽  
Han-Seung Lee ◽  
Xiao-Yong Wang
Keyword(s):  
Diffusion Coefficient ◽  
Diffusion Coefficients ◽  
Blended Cement ◽  
Numerical Procedure ◽  
Time Dependent ◽  
Chloride Diffusion ◽  
Chloride Diffusion Coefficient ◽  
Capillary Porosity ◽  
Key Factor ◽  
Hydration Model

The chloride diffusion coefficient is considered to be a key factor for evaluating the service life of ground-granulated blast-furnace slag (GGBS) blended concrete. The chloride diffusion coefficient relates to both the concrete mixing proportions and curing ages. Due to the continuous hydration of the binders, the capillary porosity of the concrete decreases and the chloride diffusion coefficient also decreases over time. To date, the dependence of chloride diffusivity on the binder hydration and curing ages of slag-blended concrete has not been considered in detail. To fill this gap, this study presents a numerical procedure to predict time-dependent chloride diffusion coefficients for slag-blended concrete. First, by using a blended cement hydration model, the degree of the binder reaction for hardening concrete can be calculated. The effects of the water to binder ratios and slag replacement ratios on the degree of the binder reaction are considered. Second, by using the degree of the binder reaction, the capillary porosity of the binder paste at different curing ages can be determined. Third, by using the capillary porosity and aggregate volume, the chloride diffusion coefficients of concrete can be calculated. The proposed numerical procedure has been verified using the experimental results of concrete with different water to binder ratios, slag replacement ratios, and curing ages.

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