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|Title:||Drying shrinkage of cementitious composites with mineral admixtures|
|Abstract:||This paper emphasises on the influence of mineral admixtures (MA) like silica fume, metakaoline and fly ash on the drying shrinkage of cement mortars incorporated with MA as cement replacement material. MA has been varied at different percentages from 0 to 15% at the constant increment of 5%. The water-binder (cement + MA) ratio and binder-sand ratios are 0.5 and 1:3 respectively. The short-term and long-term ultimate drying shrinkage of mortar has been studied. The effect of size of sand particles has been studied with different sizes of particles fractions. The highest drying shrinkage has been observed in mortars with higher silica fume contents at the age of 28 days. At the early ages, this has been due to the high pozzolanic reaction of silica fume, as a result of pore-size refinement mechanism of silica fume. However, the effect of silica fume has not been significant on the long-term drying shrinkage. The effect of grain size demonstrates that the ultimate drying shrinkage decreases as the size of sand particles increases.|
|Appears in Collections:||IJEMS Vol.14(2) [April 2007]|
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