期刊
CEMENT & CONCRETE COMPOSITES
卷 68, 期 -, 页码 123-130出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2016.02.003
关键词
ASR; Alkali-silica reaction; Synchrotron tomography; Polymer fiber; Mortar; Crack formation
资金
- Berkeley Fellowship
- Carlson-Polivka Fellowship
- Dow Chemical Company (DOW(R))
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
Alkali-Silica reaction (ASR) is a physicochemical process that can deteriorate concrete and is a recurring engineering problem. In this study three different cylindrical samples affected by ASR were prepared: a plain mortar and two composite mortars containing fibers (polypropylene and a polymer hybrid), which were analyzed at the microtomography (mu CT) beamline 8.3.2 at the Advanced Light Source (ALS). In general, three different features were observed during the 136 day observation period: (1) aggregate dissolution, (2) crack propagation from inside the aggregate, through the cement matrix, and at the ITZ, and (3) the alkali-silica gel filling cracks and voids. In addition, accelerated mortar bar tests were utilized to observe ASR's expansive effect in the plain and composite mortars, and the fibers' ability to restrain expansion due to ASR. (C) 2016 Elsevier Ltd. All rights reserved.
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