scholarly journals Effects of calcium leaching on diffusion properties of hardened and altered cement pastes

2017 ◽  
Vol 99 ◽  
pp. 175-183 ◽  
Author(s):  
Kiyofumi Kurumisawa ◽  
Kazuko Haga ◽  
Daisuke Hayashi ◽  
Hitoshi Owada
Keyword(s):  
Cement Pastes ◽  
Calcium Leaching ◽  
Diffusion Properties

Impact of calcium leaching on mechanical and physical behaviors of high belite cement pastes

2021 ◽  
Vol 286 ◽  
pp. 122983
Author(s):  
Chunmeng Jiang ◽  
Linhua Jiang ◽  
Xinjun Tang ◽  
Jingwei Gong ◽  
Hongqiang Chu
Keyword(s):  
Cement Pastes ◽  
Calcium Leaching ◽  
Belite Cement

scholarly journals Rheology of pure and mineral admixture modified cement pastes and their degradation due to calcium leaching

2019 ◽  
Vol 490 ◽  
pp. 032031
Author(s):  
Hu Yang ◽  
Cairong Lu ◽  
Weibao Liu ◽  
Guoxing Mei ◽  
Heng Wang ◽  
...  
Keyword(s):  
Mineral Admixture ◽  
Cement Pastes ◽  
Calcium Leaching

scholarly journals Influence of Micro-Pore Connectivity and Micro-Fractures on Calcium Leaching of Cement Pastes—A Coupled Simulation Approach

Materials ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 2697
Author(s):  
Janez Perko ◽  
Neven Ukrainczyk ◽  
Branko Šavija ◽  
Quoc Tri Phung ◽  
Eddie A. B. Koenders
Keyword(s):  
Effective Diffusivity ◽  
Numerical Approach ◽  
Buffering Capacity ◽  
Leaching Kinetics ◽  
Simulation Approach ◽  
Experimental Conditions ◽  
Pore Connectivity ◽  
Cement Pastes ◽  
Chemical Leaching ◽  
Calcium Leaching

A coupled numerical approach is used to evaluate the influence of pore connectivity and microcracks on leaching kinetics in fully saturated cement paste. The unique advantage of the numerical model is the ability to construct and evaluate a material with controlled properties, which is very difficult under experimental conditions. Our analysis is based on two virtual microstructures, which are different in terms of pore connectivity but the same in terms of porosity and the amount of solid phases. Numerical fracturing was performed on these microstructures. The non-fractured and fractured microstructures were both subjected to chemical leaching. Results show that despite very different material physical properties, for example, pore connectivity and effective diffusivity, the leaching kinetics remain the same as long as the amount of soluble phases, i.e., buffering capacity, is the same. The leaching kinetics also remains the same in the presence of microcracks.

The Effect of Fly Ash on Calcium Leaching Properties of Cement Pastes in Ammonium Chloride Solution

2010 ◽  
Vol 163-167 ◽  
pp. 1162-1170 ◽  
Author(s):  
Hu Yang ◽  
Lin Hua Jiang ◽  
Yan Zhang
Keyword(s):  
Fly Ash ◽  
Ammonium Chloride ◽  
Chloride Solution ◽  
Strength Loss ◽  
Ammonium Chloride Solution ◽  
Cement Pastes ◽  
Calcium Leaching ◽  
Two Factors ◽  
Damage Process ◽  
Cementing Material

The damage process of pure cement pastes with water to cementing material ratios of 0.30, 0.40, 0.50 and 0.60 and fly ash modified pastes with mass fraction of 10%, 30%, 40% and 55% were studied by using ammonium chloride solution with concentrations of 6 mol/l. The total leaching depth, leaching depth, porosity and compressive strength of these pastes leached for 14, 28, 56, 91 and 140 days were tested. The influences of W/C ratio and fly ash content on these properties were analyzed, the relationship between the two factors and the corrosion resistance of pastes was summarized. The results show that the total leaching depth of fly ash modified paste is larger than that of pure cement paste. However, the fly ash modified paste suffers various degree of lowered increment in porosity and strength loss (in percentage) in connection with the added content.

Predicting the calcium leaching behavior of cement pastes in aggressive environments

2012 ◽  
Vol 29 ◽  
pp. 88-96 ◽  
Author(s):  
Hu Yang ◽  
Linhua Jiang ◽  
Yan Zhang ◽  
Qi Pu ◽  
Yi Xu
Keyword(s):  
Leaching Behavior ◽  
Cement Pastes ◽  
Calcium Leaching
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