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Title: Workability of air-entrained lightweight concrete from rheology perspective
Authors: Chia, K.-S. 
Zhang, M.-H. 
Issue Date: Jun-2007
Citation: Chia, K.-S., Zhang, M.-H. (2007-06). Workability of air-entrained lightweight concrete from rheology perspective. Magazine of Concrete Research 59 (5) : 367-375. ScholarBank@NUS Repository.
Abstract: Effects of air entrainment on rheological parameters and slump of fresh lightweight aggregate concrete were studied. Results show that yield stress and plastic viscosity of air-entrained concrete were lower than those of non-air-entrained concrete with similar superplasticiser dosage. As the entrained-air content increased, the plastic viscosity decreased whereas the yield stress remained relatively unchanged. The slump of the air-entrained concrete was significantly higher than the non-air-entrained concrete. At similar yield stress, the slump of the air-entrained concrete was higher owing to its lower plastic viscosity by air entrainment. At similar slump, the air-entrained concrete had higher yield stress and lower plastic viscosity, implying that higher shear stress is needed to initiate flow but flow resistance would be lower.
Source Title: Magazine of Concrete Research
ISSN: 00249831
DOI: 10.1680/macr.2007.59.5.367
Appears in Collections:Staff Publications

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