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Title: Concurrent effects of recycled aggregates and polypropylene fibers on workability and key strength properties of self-consolidating concrete
Authors: Matar, Pierre
Assaad, Joseph 
Affiliations: Department of Civil and Environmental Engineering 
Keywords: Workability
Polypropylene fibers
Recycled Aggregate Concrete
Subjects: Self-Consolidating concrete
Issue Date: 2019
Part of: Construction and building materials journal
Volume: 199
Start page: 429
End page: 500
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.
DOI: 10.1016/j.conbuildmat.2018.12.091
Ezproxy URL: Link to full text
Type: Journal Article
Appears in Collections:Department of Civil and Environmental Engineering

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