Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 95, Issue -, Pages 636-646Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2015.07.132
Keywords
Nano silica; Palm oil fuel ash; Drying shrinkage; Mortar
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Funding
- Housing Research Center (HRC), Universiti Putra Malaysia
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This study investigates effects of nano silica on short-term drying shrinkage of mortars with palm oil fuel ash (POFA) during the first 28 days of curing. Furthermore, moisture content, hydration volume, and permeability were measured in order to study underlying mechanisms. It was revealed that addition of nano silica to samples with 30% POFA as cement replacement lowered the drying shrinkage by 7.5%. Also, it increased the strength development rate by 15% from 7 to 28 days of curing. Nano silica advantageously affected the shrinkage by refining the microstructure, increasing the hydration volume and lowering free water in cement matrix. (C) 2015 Elsevier Ltd. All rights reserved.
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