Micro-mechanical modelling for the prediction of alkali-silica reaction (ASR) expansion: Influence of curing temperature conditions
Micro-mechanical modelling for the prediction of alkali-silica reaction (ASR) expansion: Influence of curing temperature conditions
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DOI：
10.1016/j.conbuildmat.2018.01.007
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发表时间：
2018-03
影响因子：
7.4
通讯作者：
Ben Li;Lalita Baingam;Kiyofumi Kurumisawa;T. Nawa;Liu Xiao-zhou
中科院分区：
文献类型：
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作者：
Ben Li;Lalita Baingam;Kiyofumi Kurumisawa;T. Nawa;Liu Xiao-zhou
碱-硅反应导致水泥浆体和集料的微观结构长期劣化，并导致宏观膨胀。本文将损伤理论与热力学理论相结合，建立了一个细观力学膨胀模型。首先根据EPMA和MIP结果估算了砂浆的热膨胀系数，并将本文提出的膨胀系数与Suwito和Multon模型的分析结果进行了比较。结果表明，温度的升高降低了水泥石ASR膨胀系数的波动。此外，我们提出的模型准确地再现了真实的依赖性的扩展，由于ASR与最低的错误。总体而言，所提出的细观膨胀模型能够应用于数值分析由于ASR混凝土结构设计与在未来的ASR恶化。
The alkali-silica reaction causes long-term degradation of microstructure of cement paste and aggregate, and as results in macroscopic expansion. In this paper, a micro-mechanical expansion model was developed coupling with the damage and thermodynamic theory. First of mortar thermal coefficients were estimating to determine the true expansion due to ASR based on EPMA and MIP results and expansion proposed in this paper were compared with analysis results of Suwito’s and Multon’s model. The results indicate that the increasing of temperature conducted reduced fluctuations of ASR expansion coefficient of cement paste. In addition, our proposed model accurately reproduces the true-dependency of expansion due to ASR with the lowest error. Overall, the proposed microscopic expansion model is able to apply for numerical analyse of deteriorated due to ASR concrete structure designs with in the deterioration of ASR in the future.