Thermochemical pretreatments for agricultural residue ash production for concrete

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Show simple item record Ataie, Feraidon F. Riding, Kyle A. 2013-12-20T22:25:27Z 2013-12-20T22:25:27Z 2013-12-20
dc.description.abstract Agricultural residue ash is known to be a very reactive source of supplementary cementitious material (SCM) for use in concrete. The influence of thermochemical pretreatments on the reactivity of agricultural residue ash (ARA) for use as an SCM was studied. It was shown that pretreatments are effective in partial removal of alkali metals and other impurities out of both wheat straw and rice straw leading to ARA with lower loss on ignition (LOI), higher internal surface area, and higher amorphous silica content than that of unpretreated ARA. It was shown that the ash alkali content correlated with the ash LOI and amorphous silica content. When used at a cement replacement rate of 20% by mass, pretreated ARA accelerated the hydration of cement paste samples while unpretreated ARA retarded the cement hydration. Pretreatments were found to increase ARA reactivity as measured by calcium hydroxide content reduction with time. ARA increased compressive strength of mortar samples by 25% when used as 20% replacement of cement in the samples. It was found that the calcium hydroxide content of paste samples and mortar compressive strength were correlated to the amorphous silica content of the ash. en_US
dc.language.iso en_US en_US
dc.relation.uri en_US
dc.subject Thermochemical pretreatments en_US
dc.subject Ashes en_US
dc.subject Concrete en_US
dc.subject Agricultural wastes en_US
dc.subject Recycling en_US
dc.subject Pozzolanic reactivity en_US
dc.title Thermochemical pretreatments for agricultural residue ash production for concrete en_US
dc.type Article (author version) en_US 2013 en_US
dc.citation.doi doi:10.1061/(ASCE)MT.1943-5533.0000721 en_US
dc.citation.epage 1711 en_US
dc.citation.issue 11 en_US
dc.citation.jtitle Journal of Materials in Civil Engineering en_US
dc.citation.spage 1703 en_US
dc.citation.volume 25 en_US
dc.contributor.authoreid ataie en_US
dc.contributor.authoreid riding en_US

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