Please use this identifier to cite or link to this item:
|Title:||Effect of w/c ratio on air-void system of foamed concrete and their influence on mechanical properties||Authors:||Wee, T.-H.
|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. https://doi.org/10.1680/macr.2011.63.8.583||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||URI:||http://scholarbank.nus.edu.sg/handle/10635/59026||ISSN:||00249831||DOI:||10.1680/macr.2011.63.8.583|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Feb 21, 2020
WEB OF SCIENCETM
checked on Feb 13, 2020
checked on Feb 18, 2020
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.