The effect of curing relative humidity on the microstructure of self-compacting concrete

摘要

A study was conducted to investigate the effect of the curing relative humidity on the microstructural properties of SCC with limestone filler. Two curing conditions were considered with humidities of 98% and 70%. Three microstructural techniques were employed to study the hydration: TGA, Micro-Raman spectroscopy and NMR. It was found that the samples cured at 70% humidity present more tetrahedrally coordinated aluminium since more aluminium is taken up by the C-S-H gel and the transformation of ettringite to AFm is promoted. The samples cured at 98% humidity are more hydrated but present lower mean chain lengths of the C-S-H gel. (C) 2015 Elsevier Ltd. All rights reserved.