超高韧性水泥基复合材料多缝开裂特性及其自生愈合<sup>*</sup>

doi:10.11896/j.issn.1005-023X.2017.023.021

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Abstract SHCC (Strain hardening cement-based composites) is a type of ultra-high performance concrete (UHPC). Cracks were introduced into ordinary cement mortar and SHCC specimens by means of three-point bending test, and the cracking characteristic and crack distribution were investigated. The results indicated that SHCC displayed higher bearing capacity and strain capacity than ordinary cement mortar, as the former's initial cracking load was about 1.5 times higher than the latter. The bridging effect of PVA fibers effectively delays crack initiation and propagation in SHCC, and causes the transform of lesser, wider cracks in ordinary mortar into much more and finer cracks in SHCC, which implies a multiple cracking characteristic. The crack width measured in SHCC specimens coincided well with normal distribution, and moreover, 90% of the cracks had <30 μm width. These micro-cracks were capable of autogenous self-healing under humid condition, as higher self-healing degree and self-healing rate were observed in water than those in humid air.

Key words： strain hardening cement-based composite (SHCC) multiple cracking crack width crack distribution autogenous self-healing

Published: 10 December 2017 Online: 2018-05-08

CLC number:

TU528

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	Articles by authors
	LIU Hongbiao
	ZHANG Qiang
	GUO Chang
	ZHANG Peng

Cite this article:

LIU Hongbiao,ZHANG Qiang,GUO Chang, et al. Multiple Cracking Characteristic of Strain Hardening Cement-based Composites and the Cracks' Autogenous Self-healing[J]. Materials Reports, 2017, 31(23): 145-149.

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https://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.023.021 OR https://www.mater-rep.com/EN/Y2017/V31/I23/145

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