Autor(a/res): Amanda Pereira Vieira, Romildo Dias Toledo Filho, Luís Marcelo Tavares e Guilherme Chagas Cordeiro.

Resumo: Compressive strength evolution of high strength concrete with rice husk ash (RHA) was evaluated as a function of RHA particle size, porous structure and replacement content. RHA porous structure was investigated by N2 absorption isotherm and its effect on hydration evaluated using isothermal calorimetry and thermogravimetry. Results indicated that RHA particle size influenced compressive strength until 28 days, whereas at 91 days replacement content became the significant factor. Preserved porous structure of RHA particles besides improving hydration kinetics enabled its action as internal curing agent improving compressive strength at late age.

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