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fineness modulus

   Also found in: Acronyms, Wikipedia 0.01 sec.
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).


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All used foundry sand samples showed lower unit weight, lower fineness modulus, higher water absorption, lower specific gravity, and higher loss on wetting and drying in sodium sulfate solution than the respective properties of traditional concrete sand.
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.
 
 
 
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