Abstract
This research aimed to study the effect of finenesses of bagasse ash (BGA) on the alkali-silica reaction of mortar. The BGA sample was ground to have particles retained on a sieve No. 325 of 33±1% and 5±1% by weight. Ground BGA samples were used separately to replace ordinary Portland cement (OPC) at rates of 10, 20, 30 and 40% by weight of binder to cast mortars. The compressive strengths and the alkali-silica reaction (ASR) of mortars were investigated. The results showed that a large particle size of BGA is not suitable for use in lowering ASR because it results in a low compressive strength and high expansion due to ASR. The mortars containing BGA with higher fineness exhibited higher compressive strength and lower expansion due to ASR than the mortars containing BGA with lower fineness. The results also suggested that the ground BGA retained on a sieve No. 325 of less than 5% by weight is suitable to be used as a good pozzolan which provides high compressive strength and reduces the expansion of mortar due to ASR even though it contains high LOI. The obtained results also encourage the utilization of ground BGA effectively which leads to reduce the disposal of bagasse ash.
Highlights
RESUMEN: Influencia de la ceniza de bagazo de diferentes finuras en la reacción álcali-sílice del mortero
The alkali-silica reaction (ASR) is definitely an infamous damage mechanism as opposed to merely a phenomenon; it is well-known that the ASR is reaction between reactive silica in aggregate and alkali in cement, whereas alkalis are rather considered present in the pore-water
Using Bagasse ash (BGA) to reduce ASR expansion has been little reported; this paper aims to investigate the effect of finenesses and replacements of BGA on ASR
Summary
RESUMEN: Influencia de la ceniza de bagazo de diferentes finuras en la reacción álcali-sílice del mortero. Al mismo tiempo los resultados sugieren que el BGA molido retenido en un tamiz No 325 de menos de un 5% en peso es apropiado para ser usado como material puzolánico, ya que provee una gran resistencia y reduce la expansión del mortero producido por la RAS a pesar de contener una alta pérdida por calcinación. The use of pozzolan cements or supplementary cementitious materials are found to reduce the ASR in concrete. Chen et al [10] found that the effective replacement of fly ash class F, slag, and condensed silica fume of 40, 65 and 15% by weight of binder, respectively could reduce the ASR damage. Using BGA to reduce ASR expansion has been little reported; this paper aims to investigate the effect of finenesses and replacements of BGA on ASR
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