砂样平均粒径计算方法探讨

通过对砂粒粒径指标及其应用情况的分析,讨论了当前砂粒粒径评价的指标及方法.考虑各行业所用筛孔孔径的不一致性,导出了基于斯克拉姆塔耶夫平均粒径计算方法的通用公式,得到了一组相关系数,因而完善了DL/T5151—2001《水工混凝土砂石骨料试验规程》和SL251—2000《水利水电工程天然建筑材料勘察规程》中砂的平均粒径计算公式.所推导的平均粒径计算通式,物理意义明确,可用于不同行业控制筛孔孔径的平均粒径计算.

Calculation methods for mean diameters of sand grain samples

The indexes and methods for sand grain diameter evaluation at present were discussed based on their application.In consideration of the difference between the diameters of sieve plate holes adopted in different trades,a universal formula for calculation of the mean diameter of sand grains based on the original one proposed by Soviet scholars was deduced,and a group of correlation coefficients were obtained.The above work improves the formula for calculation of the mean diameter of sand grains in Test Code for Hydraulic Concrete(DL/T5151-2001) and Specification on Investigation of Natural Building Material for Water Conservancy and Hydropower Engineering(SL251-2000),and the universal formula for mean grain diameters is clear in physical meaning and can be used in different trades.