Influence of the distribution of expansive sites in aggregates on microscopic damage caused by alkali-silica reaction: Insights into the mechanical origin of expansion
Influence of the distribution of expansive sites in aggregates on microscopic damage caused by alkali-silica reaction: Insights into the mechanical origin of expansion
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DOI：
10.1016/j.cemconres.2021.106355
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发表时间：
2021-01-16
影响因子：
11.4
通讯作者：
Kawabata, Yuichiro
中科院分区：
文献类型：
--
作者：
Miura, Taito;Multon, Stephane;Kawabata, Yuichiro
碱-硅反应（ASR）引起混凝土损伤的原因是骨料中的膨胀部位。为了研究ASR过程中骨料的开裂过程及其对混凝土损伤的后果，必须评估骨料中膨胀部位的分布对ASR膨胀和裂缝模式的影响。因此，在这项研究中，一个介观尺度的离散模型被应用到ASR建模，以准确地代表裂纹的扩展过程中ASR。膨胀位点在骨料中的分布是基于凝胶袋和反应环模型，这是文献中报道的两种ASR机制。这两种膨胀模型突出了基于骨料特性获得的不同裂缝模式。此外，基于凝胶袋和反应边缘模型确定的膨胀开裂过程与开裂随膨胀水平的演化一致。
The origin of damage in concrete due to the alkali-silica reaction (ASR) is attributed to the expansion site in the aggregate. To investigate the cracking process of the aggregate during ASR and its consequences on concrete damage, the effect of the distribution of the expansive sites in the aggregate on ASR expansion and the crack patterns must be evaluated. Thus, in this study, a mesoscale discrete model was applied to ASR modeling to represent the propagation of cracking during ASR accurately. The distribution of the expansive sites in the aggregate was based on the gel pocket and reaction rim models, which are two ASR mechanisms reported in the literature. These two expansion models highlight the different crack patterns obtained based on the aggregate characteristics. Further, the expansion cracking processes determined based on the gel pocket and reaction rim models are consistent with the evolution of cracking with the expansion level.