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A multi-step scheme for evaluating the elastic moduli of partially leached cement paste
Highlights A multi-step scheme is proposed for evaluating the elastic stiffness of partially leached cement paste. Two microstructure models are constructed for analyzing partially dissolved CH and partially decalcified CSH. The validity of the scheme is verified with experimental data, micromechanical model and computer simulations.
Abstract A multi-step scheme is developed for evaluating the degradation of elastic stiffness of cement paste in contact with pure, deionized water. In the multi-step scheme, two primary stages in the leaching process, calcium hydroxide (CH) dissolution and calcium silicate hydrate (CSH) decalcification, are taken into account. For CH dissolution, a two-phase interpenetrating material model is constructed to derive the elastic moduli of partially dissolved CH. For CSH decalcification, a two-phase concentric sphere is used to formulate the elastic moduli and additional capillary porosity of partially decalcified CSH. After the validity of the multi-step scheme is verified with three sets of data, the effects of water/cement ratio and volume ratio of CSH to CH on the elastic modulus of partially leached cement paste are evaluated. Compared with existing analytical methods, CSH decalcification is considered. A two-phase interpenetrating material model is proposed to describe the CH dissolution process and to compute the elastic modulus of partially dissolved CH. It is found from the sensitivity analysis that the relationship between the elastic modulus and capillary porosity of partially leached cement paste lies on a single master curve for different water/cement ratios and volume ratios of CSH to CH.
A multi-step scheme for evaluating the elastic moduli of partially leached cement paste
Highlights A multi-step scheme is proposed for evaluating the elastic stiffness of partially leached cement paste. Two microstructure models are constructed for analyzing partially dissolved CH and partially decalcified CSH. The validity of the scheme is verified with experimental data, micromechanical model and computer simulations.
Abstract A multi-step scheme is developed for evaluating the degradation of elastic stiffness of cement paste in contact with pure, deionized water. In the multi-step scheme, two primary stages in the leaching process, calcium hydroxide (CH) dissolution and calcium silicate hydrate (CSH) decalcification, are taken into account. For CH dissolution, a two-phase interpenetrating material model is constructed to derive the elastic moduli of partially dissolved CH. For CSH decalcification, a two-phase concentric sphere is used to formulate the elastic moduli and additional capillary porosity of partially decalcified CSH. After the validity of the multi-step scheme is verified with three sets of data, the effects of water/cement ratio and volume ratio of CSH to CH on the elastic modulus of partially leached cement paste are evaluated. Compared with existing analytical methods, CSH decalcification is considered. A two-phase interpenetrating material model is proposed to describe the CH dissolution process and to compute the elastic modulus of partially dissolved CH. It is found from the sensitivity analysis that the relationship between the elastic modulus and capillary porosity of partially leached cement paste lies on a single master curve for different water/cement ratios and volume ratios of CSH to CH.
A multi-step scheme for evaluating the elastic moduli of partially leached cement paste
Zhou, Xin-Zhu (author) / Han, Zhen-Yu (author) / Zheng, Jian-Jun (author) / Zheng, Ze-Yu (author) / Zhang, Yu-Xiang (author) / Zhang, Xing-Hao (author)
2022-06-08
Article (Journal)
Electronic Resource
English
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