fineness modulus


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fineness modulus

[′fīn·nəs ′mäj·ə·ləs]
(engineering)
A number denoting the fineness of a fine aggregate or other fine material such as sand or paint.

fineness modulus

A measure of the fineness of an aggregate; a factor obtained by adding the total percentages of an aggregate sample retained on each of the following sieves and dividing the sum by 100: No. 100 (150 µm), No. 50 (300 µm), No. 30 (600 µm), No. 16 (1.18 mm), No. 8 (2.36 mm), No. 4 (4.75 mm), 3/8 inch (9.5 mm), 3/4 inch (19.0 mm), 1½ inch (38.1 mm).
References in periodicals archive ?
Sand from the local river (Cauvery) was used as fine aggregate with the fineness modulus of 2.
The size fractions and the fineness modulus of the sand and the coarse aggregate used were also measured.
The researchers found that all residual foundry sands, when used in concrete and concrete blocks in amounts not exceeding the fineness modulus limits of the fine aggregate addition, give acceptable compressive strengths.