A method for predicting the alkali concentrations in pore solution of hydrated slag cement paste
A method for predicting the alkali concentrations in pore solution of hydrated slag cement paste
复制标题
水矿渣水泥浆体孔隙溶液中碱浓度的预测方法
DOI：
10.1007/s10853-011-5278-1
复制
发表时间：
2011-01
影响因子：
4.5
通讯作者：
Chen, Wei
中科院分区：
文献类型：
--
作者：
Brouwers, H. J. H.;Chen, Wei
硬化水泥浆体或混凝土中孔隙液的碱度对于长期评价碱-硅酸反应(ASR)膨胀和钢筋在钢筋结构中的防腐等具有重要意义。它还影响辅助胶凝材料的反应性。本文针对矿渣水化水泥浆体中的碱结合问题，提出了一种预测水化矿渣水泥孔溶液中碱浓度的方法。利用计算机模型CEMHYD3D对矿渣水泥的水化过程进行了数值模拟。根据模型输出计算了水泥水化释放的碱量、水化产物的量和孔隙溶液的体积。利用不同文献报道的大量实验结果，推导了水化产物的碱结合能力，并根据计算结果提出了实用模型。结果表明，水化矿渣水泥浆体中碱的主要粘结剂是类水滑石相，而C-S-H水化硅酸盐水泥浆体的碱结合能力弱于C-S-H。采用预测矿渣水化水泥净浆孔溶液中碱浓度的方法，研究了不同因素对水化矿渣水泥净浆中孔溶液碱度的影响。
The alkalinity of the pore liquid in hardened cement paste or concrete is important for the long-term evaluation of alkali-silica reaction (ASR) expansion and corrosion prevention of steel bar in steel reinforced structures among others. It influences the reactivity of supplementary cementitious materials as well. This paper focuses on the alkali binding in hydrated slag cement paste and a method for predicting the alkali concentrations in the pore solution is developed. The hydration of slag cement is simulated with a computer-based model CEMHYD3D. The amount of alkalis released by the cement hydration, quantities of hydration products, and volume of the pore solution are calculated from the model outputs. A large set of experimental results reported in different literatures are used to derive the alkali-binding capacities of the hydration products and practical models are proposed based on the computation results. It was found that the hydrotalcite-like phase is a major binder of alkalis in hydrated slag cement paste, and the C–S–H has weaker alkali-binding capacity than the C–S–H in hydrated Portland cement paste. The method for predicting the alkali concentrations in the pore solution of hydrated slag cement paste is used to investigate the effects of different factors on the alkalinity of pore solution in hydrated slag cement paste.
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影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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通讯作者：
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作者：
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影响因子：
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作者：
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通讯作者：
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