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Carbonation and hydration of calcium hydroxide and calcium silicate binders with rice husk ash



Title: Carbonation and hydration of calcium hydroxide and calcium silicate binders with rice husk ash
Author(s): O. Cizer, K. Van Balen, J. Elsen, D. Van Gemert
Paper category : conference
Book title: 2nd International RILEM Symposium on Advances in Concrete through Science and Engineering
Editor(s): J. Marchand, B. Bissonnette, R. Gagné, M. Jolin and F. Paradis
Print-ISBN: 2-35158-003-6
e-ISBN: 2351580028
Publisher: RILEM Publications SARL
Publication year: 2006
Nb references: 28
Language: English


Abstract: In this study, hardening of calcium hydroxide and calcium silicate binders containing rice husk ash (RHA), cement and lime were studied with mortars. Hardening of these blended binders occurs as a result of combined hydration, pozzolanic reaction and carbonation that occur consecutively. While initial strength development was controlled by the cement hydration, carbonation reaction was favoured at later stage with the decrease in the cement content and increase in the porosity of the blended mortars. Due to their higher porosity, RHA-cement mortars yielded lower strength values than the reference cement mortar. Their compressive and flexural strength increased gradually upon hardening, which indicated a long-term strength development. However, strength reduction was recorded at the very early stage for RHA-cement-lime mortars containing 10%-wt cement. This can be explained by the insufficient cement content and destructive effect of the calcium carbonate crystals on the initially hydrated cement phases as a result of the carbonation reaction.


Online publication: 2006-08-02
Classification: 3.2 Theme 2: From Fresh to Hardened Concrete
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2351580028.054