A new chemo-mechanical model of damage in concrete under sulfate attack
A new chemo-mechanical model of damage in concrete under sulfate attack
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DOI：
10.1016/j.conbuildmat.2016.04.074
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发表时间：
2016-07-15
影响因子：
7.4
通讯作者：
Song, Hui
中科院分区：
文献类型：
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作者：
Chen, Jian-kang;Qian, Chen;Song, Hui
通过浸没在硫酸盐溶液中的混凝土模量的退化来检测损伤演化。利用扫描电镜对其损伤机理进行了研究，证实了迟发钙矾石引起的内部膨胀应力导致了微裂纹的形核。从混凝土抗拉强度的角度提出了损伤成核的判据。根据延迟钙矾石形成的化学反应速率，导出了混凝土内部膨胀应力的微分方程，提出了硫酸盐侵蚀下混凝土腐蚀损伤的化学-力学模型。(C) 2016 Elsevier Ltd.版权所有。
Damage evolution is detected via the degradation of modulus of concrete immersed in sulfate solution. The mechanism of the damage is investigated by using SEM method, and it is proved that the internal expansion stress induced by delayed ettringite leads to the nucleation of micro-cracks. The criterion of damage nucleation is proposed in terms of the tension strength of concrete. The differential equation with respect to the internal expansion stress is derived by virtue of chemical reaction rate on delayed ettringite formation, and a new chemo-mechanical model of corrosion damage in concrete under sulfate attack is then proposed. (C) 2016 Elsevier Ltd. All rights reserved.