期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 199, 期 -, 页码 492-500出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2018.12.091
关键词
Self-consolidating concrete; Workability; Polypropylene fibers; Recycled aggregates; Rheology
资金
- National Council for Scientific Research (CNRS), Lebanon
The concurrent effects of recycled concrete aggregate (RCA) and polypropylene fibers (PPF) on workability of self-consolidating concrete (SCC) are not quantified in literature. Different SCC series containing 25% to 100% RCA and 0.25% to 1.75% PPF are investigated in this study; the water-to-binder ratio varied from 0.38 to 0.5, while high-range water reducer adjusted to maintain slump flow at 700 25 mm. Flowability, cohesiveness, passing ability, and segregation resistance were evaluated and compared with the limitations specified by the European Guidelines for SCC. Test results have shown that SCC rheological properties and passing ability dramatically curtailed with PPF inclusions, especially when mixtures are proportioned with higher RCA replacement rates. This was attributed to combined effects of fiber additions that hinder the cement matrix deformation together with increased RCA surface roughness that accentuates internal friction and resistance to flow. Mixtures containing increased RCA and PPF concentrations exhibited better stability, reflected by reduced aggregate segregation. Series of regression models were proposed to predict the coupled effects of RCA and PPF additions on SCC workability responses. (C) 2018 Elsevier Ltd. All rights reserved.
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