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Fineness modulus

The Fineness Modulus (FM) is an empirical figure obtained by adding the total percentage of the sample of an aggregate retained on each of a specified series of sieves, dividing the sum by 100. Sieves sizes are: 150-μm (No. 100), 300-μm (No. 50), 600-μm (No. 30), 1.18-mm (No. 16), 2.36-mm (No. 8), 4.75-mm (No. 4), 9.5-mm (3/8-in.), 19.0-mm (3/4-in.), 37.5-mm (11/2-in.), and larger, increasing in the ratio of 2 to 1. The same value of fineness modulus may therefore be obtained from several different particle size distributions. In general, however, a smaller value indicates a finer aggregate. Fine aggregates range from an FM of 2.00 to 4.00, and coarse aggregates smaller than 38.1 mm range from 6.75 to 8.00. Combinations of fine and coarse aggregates have intermediate values.

Fineness modulus of combined aggregates

Fineness modulus of combined aggregates is always between the Fineness modulus of aggregates and combined modulus coarse aggregate have intermediate value. It is given by the formula.

F=(F_1 \times Y + F_2 \times (1-Y))

here

ratio X of fine aggregate on coarse aggregate in combined aggregate can be found by:

X = \frac{F_2-F}{F-F_1}

proportion of fine aggregate Y in percentage can be calculated by:

Y = \frac{X}{1+X} \times 100

Put X value

Y = \frac{F_2-F}{F_2-F_1}\times 100

References

Fineness modulus Fineness modulus and its calculation ASTM C136, https://compass.astm.org/EDIT/html_annot.cgi?C136

References

  1. (1980-03-01). "Method of calculation of the Fineness modulus of aggregate". National Institute of Building Science.
  2. (10 February 2015). "How to Blend Aggregate Using Fineness Modulus Value?".
  3. (September 2014). "Fineness Modulus of Aggregate – What, Why & How".
Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

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