Production of silica gel from residual rice husk ash

AUTOR(ES)

Lima, Samantha Pinheiro Buás de, Vasconcelos, Raimundo Pereira de, Paiva, Otávio Augusto, Cordeiro, Guilherme Chagas, Chaves, Márcia Rodrigues de Morais, Toledo Filho, Romildo Dias, Fairbairn, Eduardo de Moraes Rego

FONTE

Química Nova

DATA DE PUBLICAÇÃO

2011

RESUMO

This paper presents a study on the production of silica gel in hydrothermal process using residual rice husk ash. Measurements of the chemical composition, X-ray diffraction, infrared spectroscopy, particle size distribution, and pozzolanic activity were carried out in order to characterize the obtained material, and the optimal silica gel was selected for use as a mineral additive in cement pastes. The compressive strengths were determined for cement pastes containing silica gel (0.0, 2.5 or 5% by mass) in different times. The results indicate that the mixtures containing silica gel showed improved mechanical behavior over all time periods evaluated.

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