Self-healing Characteristics and Micro-Mechanism of High Ductility Cementitious Composites Micro-cracks under Chloride Salt Wet-Dry Cycles

被引：0

作者：

Guo L. ^{[1
,2
,3
]}

Xu Y. ^{[1
]}

Chen B. ^{[4
]}

Chai L. ^{[1
]}

Ding C. ^{[1
]}

Fei C. ^{[1
]}

机构：

[1] School of Materials Science and Engineering, Southeast University, Nanjing

[2] Jiangsu Key Laboratory of Construction Materials, Nanjing

[3] Collaborative Innovation Center for Advanced Civil Engineering Materials, Nanjing

[4] State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing

来源：

Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | 2019年 / 47卷 / 07期

关键词：

Flexural toughness; High ductility cementitious composites; Normalized relative dynamic elastic modulus; Self-healing behavior;

D O I：

10.14062/j.issn.0454-5648.2019.07.01

中图分类号：

学科分类号：

摘要：

In order to investigate the self-healing characteristics of pre-cracked high ductility cementitious composites (HDCC) after wet-dry cycles in marine environment, the self-healing extent of HDCC with different water to binder ratios (W/B) and preloading levels were examined. The effect of self-healing on the HDCC toughness was investigated through ultrasonic nondestructive test and four-point bending test. The self-healing mechanism was analyzed by differential scanning calorimeter and an environmental scanning electron microscope-energy dispersive spectroscopy (ESEM-EDS). The results indicate that the self-healing products are mainly C-S-H gel and CaCO3 crystal, The Friedel salt also appears. The recovery ratio of pre-cracked HDCC is negatively correlated to W/B and preloading level, and positively to self-healing age. The pseudo first cracking point keeps the cracking process of HDCC at a relatively high load level when re-loaded, making the toughness of pre-cracked HDCC recover or even exceed the toughness of control group specimens after 8 cycles. © 2019, Editorial Department of Journal of the Chinese Ceramic Society. All right reserved.

引用

页码：874 / 883

页数：9

共 25 条

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