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混凝土几种组分中,以砂子的含水率变幅为最大,变化的周期亦较短,例如经过一段较长的晴天,砂中含水率可以低至3～5％,经一场暴雨,砂中含水可以达到饱和状态(13～14％),水分在自重作用下,逐渐流出,几个小时后砂的含水率又下降至10～12％。砂子在混凝土中占的分量很大,对混凝土质量的影响也很大,因此测定砂子含水率对控制水灰比,保证混凝士强度和降低水
Among the several components of concrete, the change in the moisture content of the sand is the maximum, and the period of change is also short. For example, after a long sunny day, the moisture content in the sand can be as low as 3 to 5%. After a heavy rain, sand Water can reach saturation (13% to 14%), and the water gradually flows out under the action of its own weight. After several hours, the moisture content of sand has dropped to 10% to 12%. The sand occupies a large part in the concrete and has a great influence on the quality of the concrete. Therefore, measuring the moisture content of the sand controls the water-cement ratio, ensures the strength of the concrete and reduces the water content.