Models for strength prediction of foam concrete |
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Authors: | E K Kunhanandan Nambiar K Ramamurthy |
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Affiliation: | (1) Civil Engineering Department, N.S.S. College of Engineering, Palakkad, India;(2) Building Technology and Construction Management Division, Department of Civil Engineering, Indian Institute of Technology Madras, Chennai, 600 036, India |
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Abstract: | There are several strength prediction relations developed for plain cement paste, mortar and concrete. In concrete where air
voids contribute significantly to volume of voids (like aerated and foam concrete), more general expressions including the
volume of air voids is to be developed as the better alternative. The objective of this paper is to propose prediction relations
for the compressive strength of foam concrete by extending two of the well-known relations available for cement paste, mortar
and normal concrete, viz., Balshin’s strength-porosity model and Power’s gel-space ratio equation. For this, theoretical equations
were derived for porosity and gel-space ratio relating it to the density, proportion of ingredients in the mix and material
characteristics like specific gravity. Foam concrete with fly ash showed lesser dependency on pore parameters than cement-sand
mixes. As both the prediction relations developed in this study consider the effect of composition on the strength, it can
serve as a simple tool for predicting the strength of foam concrete. But strength-porosity model stands out compared to gel-space
model as it correlates well with the measured strength and also because of its ease in application since it employs the composition
of constituents and easily measurable parameters. |
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Keywords: | Foam concrete Strength-porosity model Gel-space ratio Vacuum saturation method Fly ash replacement level Preformed foam |
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