Artículos de revistas
Production of silica gel from residual rice husk ash
Fecha
2011Registro en:
Química Nova, v.34, n.1, p.71-75, 2011
0100-4042
10.1590/S0100-40422011000100014
Autor
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
Institución
Resumen
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.