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Title: Effect of w/c ratio on air-void system of foamed concrete and their influence on mechanical properties
Authors: Wee, T.-H. 
Daneti, S.B. 
Tamilselvan, T. 
Issue Date: 1-Aug-2011
Citation: Wee, T.-H., Daneti, S.B., Tamilselvan, T. (2011-08-01). Effect of w/c ratio on air-void system of foamed concrete and their influence on mechanical properties. Magazine of Concrete Research 63 (8) : 583-595. ScholarBank@NUS Repository.
Abstract: A study was undertaken to investigate the effect of water to cementitious material (w/c) ratio (ranging from 0.22 to 0.60) on the air-void system (air content ranging from about 10 to 70%) of foamed concrete, and their effects on the mechanical properties of foamed concrete without sand. The cementitious material used in this study was blended cement with 50% ordinary Portland cement (OPC) and 50% ground granulated blastfurnace slag (ggbs) by weight. The linear traverse method was used to characterise the air-void system, referring to air content, average air-void size, air-void frequency and spacing factor. The results show that although the same quality of foam was introduced, the air-void size and frequency, and hence spacing factor, of the foamed concrete varied with different w/c ratios and air contents, which in turn affected the mechanical properties of the concrete. For the different w/c ratios and air contents adopted, it was found that an air-void system with a spacing factor of about 0.05 mm, air-void size of 0.15 mm and air content of 40% was optimal in terms of achieving a high strength to weight ratio. The compressive strength of foamed concrete seems to be influenced by the spacing factor, w/c ratio and air content in relation to density. The results also indicated that the inclusion of air-voids in foamed concrete had a greater effect on compressive strength than the modulus of elasticity and it increases with increase of w/c ratio. The results of a numerical analysis concurred with the experimental observations. Thomas Telford Ltd © 2011.
Source Title: Magazine of Concrete Research
ISSN: 00249831
DOI: 10.1680/macr.2011.63.8.583
Appears in Collections:Staff Publications

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