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用细度模数衡量骨料(包括细骨料——砂子和粗骨料石子)的粗细程度,是美国人阿布仑1981年提出的。细度模数(以F.M.代表)是骨料几何平均粒径(以d_m代表)的对数函数,即: F.M.=3.321gd_m+3.25(1)
The use of fineness modulus to measure the thickness of aggregate (including fine aggregates - sand and coarse aggregate stones) was proposed by American Abrunn in 1981. The fineness modulus (represented by F.M.) is the logarithm function of the geometric mean particle size of the aggregate (represented by d_m), ie: F.M.=3.321 gd_m+3.25(1)