期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 165, 期 -, 页码 801-811出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2018.01.023
关键词
Cement; Composite; Crack width; Fiber; Self-healing; Slag
资金
- Construction Technology Research Program - Ministry of Land, Infrastructure and Transport of Korean government [17SCIP-B103706-03]
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [NRF-2016R1A1A1A05005208]
This paper presents an experimental study of the self-healing properties of cement-based and alkali activated slag-based fiber-reinforced composites with controlled crack width. Two types of binder, i.e. cement and alkali-activated slag-based polyethylene fiber-reinforced composites with identical water to-binder ratios, were designed. Compressive strength and uniaxial tension tests were performed to measure the mechanical properties of the composites, and the self-healing performance was investigated by observation of the crack width and by measuring resonance frequency. Scanning electron microscopy and energy-dispersive X-ray spectroscopy were also adopted to analyze the morphology and chemical composition of the healing materials. The test results showed that alkali-activated slag-based composites have advantages compared to cement-based composites in terms of a reduction of relative crack width; however, cement-based composites have a higher resonant frequency recovery than alkali-activated slag based composites. It is also observed that calcium carbonate is the dominant healing material of cement based and slag-based composites. (C) 2018 Elsevier Ltd. All rights reserved.
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