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最近,有许多种砂(如海砂、矿井砂、轧碎砂、矿渣砂和轻质砂)都被用来代替河砂作为细集料。这种趋势引出了有关砂粒特性(如砂粒级配、形状、表面积等)的新问题,影响着新浇的和硬化的混凝土质量。特别是采用了颗粒形状不良的砂子,增加了单位用水量,破坏了混凝土的某些性能。所以判断砂粒特性,对保证混凝土的质量是很重要的。业已有人提出了几种判断砂粒特性
Recently, there are many kinds of sand (such as sea sand, mine sand, crushed sand, slag sand, and light sand) that have been used instead of river sand as fine aggregate. This trend has led to new issues related to the characteristics of sand (such as grit size, shape, surface area, etc.), affecting the quality of newly cast and hardened concrete. In particular, the use of poorly shaped sand has increased the amount of water used per unit and destroyed certain properties of the concrete. Therefore, judging the characteristics of sand particles is very important to ensure the quality of concrete. Industry has proposed several methods to determine the characteristics of sand