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

[1] Weimann M.B., Li V.C., Drying shrinkage and crack width of engineered cementitious composites (ECC), Brittle Matrix Compos, pp. 37-46, (2003)
[2] Li V.C., Wang S., High early strength engineered cementitious composites
[3] Li V.C., Tensile strain-hardening behavior of polyvinyl alcohol engineered cementitious composite, Aci Mater J, 98, pp. 483-492, (2001)
[4] Li M., Li V.C., Cracking and healing of engineered cementitious composites under chloride environment, Aci Mater J, 108, 3, pp. 333-340, (2011)
[5] Li V.C., Zhang Y.M., J Chin Ceram Soc, 35, 4, pp. 531-536, (2007)
[6] Xu S.L., Li H.D., China Civil Eng J, 41, 6, pp. 45-60, (2008)
[7] Yu J.H., Chen W., Yu M.X., Et al., The microstructure of self-healed PVA ECC under wet and dry cycles, Mater Res, 13, 2, pp. 225-231, (2010)
[8] Edvardsen C., Water permeability and autogenous healing of cracks in concrete, Aci Mater J, 96, 4, pp. 448-454, (1999)
[9] Neville A., Autogenous healing-A concrete miracle?, Concr Int, 24, pp. 76-81, (2002)
[10] Reinhardt H.W., Jooss M., Permeability and self-healing of cracked concrete as a function of temperature and crack width, Cem Concr Res, 33, 7, pp. 981-985, (2003)

← 1 2 3 →