合理砂率，是指在用水量及水泥用量一定的条件下，能保持良好粘聚性及保水性，且能使混凝土拌合物获得最大流动性的砂率。
本文作者介绍了如何利用统计学原理建立山砂砼强度公式、合理砂率选用表及用水量选用表，并说明了如何利用这几项技术指标进行配合比设计。
This paper introduced to found a strength formula of the pit sand concrete depend upon the statistical principle, as well as the selected table of the sand ratio and water content.
它具有洗净度高、结构合理、处理量大、功率消耗小、砂子流失少、故障率低等特点，是国内洗砂设备升级换代的最佳选择。
It has high cleaning, reasonable structure, large capacity, small power consumption, less and loss, and low failure rate, is the best choice for upgrading of domestic sand washing equipment.
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