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Drying shrinkage of cementitious composites with mineral admixtures

机译:含矿物掺合料的水泥基复合材料的干缩

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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 percent at the constant increment of 5 percent. 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.
机译:本文着重介绍了矿物掺合料(MA)(如硅粉,偏碱性和粉煤灰)对掺入MA作为水泥替代材料的水泥砂浆干燥收缩的影响。 MA以5%的恒定增量从0%到15%的不同百分比变化。水粘合剂(水泥+ MA)比和粘合剂-沙比分别为0.5和1:3。研究了砂浆的短期和长期极限干燥收缩率。已经研究了不同大小的颗粒级分对沙粒尺寸的影响。在硅灰含量较高的砂浆中,在28天的使用中观察到最高的干燥收缩率。在早期,这是由于硅粉的高火山灰反应,这是由于硅粉的孔径细化机制所致。但是,硅粉对长期干燥收缩率的影响并不明显。晶粒尺寸的影响表明,最终干燥收缩率随砂粒尺寸的增加而减小。

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