Strength of lime-fly ash compacts using different curing techniques and gypsum additive

Reddy, Venkatarama BV and Gourav, K (2011) Strength of lime-fly ash compacts using different curing techniques and gypsum additive. In: Materials and Structures / Materiaux et Constructions, 44 (10). pp. 1793-1808.

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Abstract

Lime-fly ash mixtures are exploited for the manufacture of fly ash bricks finding applications in load bearing masonry. Lime-pozzolana reactions take place at a slow pace under ambient temperature conditions and hence very long curing durations are required to achieve meaningful strength values. The present investigation examines the improvements in strength development in lime-fly ash compacts through low temperature steam curing and use of additives like gypsum. Results of density-strength-moulding water content relationships, influence of lime-fly ash ratio, steam curing and role of gypsum on strength development, and characteristics of compacted lime-fly ash-gypsum bricks have been discussed. The test results reveal that (a) strength increases with increase in density irrespective of lime content, type of curing and moulding water content, (b) optimum lime-fly ash ratio yielding maximum strength is about 0.75 in the normal curing conditions, (c) 24 h of steam curing (at 80A degrees C) is sufficient to achieve nearly possible maximum strength, (d) optimum gypsum content yielding maximum compressive strength is at 2%, (e) with gypsum additive it is possible to obtain lime-fly ash bricks or blocks having sufficient strength (> 10 MPa) at 28 days of normal wet burlap curing.

Item Type:	Journal Article
Publication:	Materials and Structures / Materiaux et Constructions
Publisher:	Springer
Additional Information:	Copyright of this article belongs to Springer.
Keywords:	Fly ash;Gypsum;Lime;Fly ash brick;Compressive strength;Steam curing
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	22 Nov 2011 06:28
Last Modified:	22 Nov 2011 06:28
URI:	http://eprints.iisc.ac.in/id/eprint/42272

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