Effect of Curing Condition on Self-healing of Strain-Hardening Cement-Based Composite Crack Incorporating MgO Expansive Agent

被引：0

作者：

Zhang P. ^{[1
,2
]}

Dai Y. ^{[1
]}

Gao K. ^{[1
]}

Wang W. ^{[1
]}

Zhao T. ^{[1
,2
]}

机构：

[1] College of Civil Engineering, Qingdao University of Technology, Qingdao, 266033, Shandong

[2] Cooperative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone, Qingdao University of Technology, Qingdao, 266033, Shandong

来源：

Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | 2019年 / 47卷 / 11期

关键词：

Crack; Curing condition; Magnesium oxide expansive agent; Self-healing; Strain hardening cement-based composite;

D O I：

10.14062/j.issn.0454-5648.2019.11.02

中图分类号：

学科分类号：

摘要：

A four-point test was utilized to induce cracks in the strain-hardening cement-based composite (SHCC) specimen (SHCC-MEA) with MgO expansive agent (MEA). The crack width and capillary water absorption at different curing time were measured. The effect of curing condition on the self-healing abilities of SHCC-MEA cracks was investigated. The microstructure of healing products was analyzed by scanning electron microscopy-energy dispersive spectrometry. The pre-cracked specimens were exposed to different curing conditions (i.e., dry (RH 50%), water fog (RH 95%), tap water and saturated Ca(OH)2 solution). The results indicate that the addition of MgO expansive agent can improve the healing ability of SHCC crack effectively, and it has an effect on the water fog condition. Water is essential in the process of crack self-healing, even if the expansive agent is involved, the healing effect in the dry condition is still poor. Compared to the control group, the SHCC-MEA test group in the curing condition of saturated Ca(OH)2 solution has an unsatisfactory crack healing effect. © 2019, Editorial Department of Journal of the Chinese Ceramic Society. All right reserved.

引用

页码：1527 / 1537

页数：10

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