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Using aggregate flowability testing to predict lightweight self-consolidating concrete plastic properties
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DOI：10.1016/j.cemconcomp.2015.05.003.png)
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This paper presents the results of an experimental study on the flow properties of lightweight self-consolidating concrete (LWSCC) which utilizes a new test relating aggregate flow to concrete flow. Three types of LWSCC were tested containing differing proportions of lightweight and normal weight, coarse and fine aggregates, as well as a normal weight self-consolidating concrete (NWSCC) as a control. The flow properties of the aggregate mixes used in the LWSCC and NWSCC specimens were tested using a V-funnel. The concrete flow properties were also tested for comparison, as were the compressive and tensile strengths of the various mixtures. A relationship between the aggregate frictional resistance and the traditional concrete flowability tests-i.e., slump flow, J-ring, and T-500-was demonstrated. Compressive strengths were greater in LWSCC mixes that contained smaller sized coarse and normal weight aggregates. Finally, a design procedure is introduced that utilizes the aggregate frictional resistance, paste flow properties, and aggregate void ratio to predict the plastic properties of the concrete. (C) 2015 Elsevier Ltd. All rights reserved.
Keyword:
Self-consolidating concrete
Lightweight aggregate
Flow
Slump
Plastic state
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