Fineness modulus
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Fineness modulus is a measurement of the coarseness or fineness of a given aggregate.
For a fine aggregate, FM is calculated from the cumulative percentages of aggregate retained on sieves No.4,8, 16, 30, 50, 100, 3/8in., 3/4in., 1.5in., 3in., and 6in., divided by 100
The Fineness Modulus should be between 2.3 and 3.1.
FM is an index of the fineness of an aggregate-the higher the FM the coarser the aggregate. Different aggregate grading may have the same FM. FM of fine aggregate is useful in estimating proportions of fine and coarse aggregates in concrete mixtures.
The effect of the Fineness Modulus on the quality of concrete was first studied systematically by Duff Abrams.
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