Chloride penetration and carbonation in concrete with rice husk ash and chemical activators

The use of industrial or agricultural by-product substitutions for cement has greatly contributed to sustainable development practices. The joint use of chemical activators has produced improvements in the mechanical properties of concrete but there are still few studies attempting to investigate th...

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Bibliographic Details
Published in:Cement & concrete composites 2007-03, Vol.29 (3), p.176-180
Main Authors: Gastaldini, A.L.G., Isaia, G.C., Gomes, N.S., Sperb, J.E.K.
Format: Article
Language:English
Subjects:
Chemical activators
Durability
Rice husk ash
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Summary:The use of industrial or agricultural by-product substitutions for cement has greatly contributed to sustainable development practices. The joint use of chemical activators has produced improvements in the mechanical properties of concrete but there are still few studies attempting to investigate the influence of activators on carbonation and chloride penetration. This study investigated the influence of chemical activators K 2SO 4, Na 2SO 4, Na 2SiO 3 on compressive strength, chloride penetration and carbonation of concrete mixtures with rice husk ash. Results indicate that the use of these activators has beneficial effects on initial strength and reduces chloride penetration. The mixture prepared with 20% rice husk ash and 1% K 2SO 4 as a chemical activator showed the lowest carbonation coefficients, which were in fact lower than the values found in the reference sample.
ISSN:0958-9465
1873-393X
DOI:10.1016/j.cemconcomp.2006.11.010