代用ISO标准砂材质和颗粒形状对水泥胶砂强度的影响

Study on the quality and particle shape of the substituted ISO standard sand on the cement mortar strength

研究结果表明,代用ISO标准砂的材质和颗粒形状不同,使相同水灰比和胶砂比的水泥胶砂的用水量和强度表现各异。随着代用ISO标准砂中圆球状曲面体含量的增多,胶砂用水量减小,流动度增大,和易性变好,但强度却呈下降趋势。从影响程度大小来看,钙质砂≥硅质砂;而棱角状多面体≥圆球状曲面体。

The research sults reveal that the water demand and the strength at the same water/cement ratio and cement/sand ratio differ with the quality and particle shape of the substituted ISO standard sand. With the increase in the content of round and curved sand in the substituted ISO standard sand, the water demand decreases and thus the flowability and workability im-proves, while the strength tends to drop down. The calcareous sand exerts equivalent or more than the siliceous sand and the angular sand does equivalent or more than round and curved sand in terms of the degree of effect.