This method determines the fineness modulus
of concrete fine aggregate used in
evaluation of natural and manufactured
sands for portland cement concrete.
1.2
The values given in parentheses (if provided)
are not standard and may not be exact
mathematical conversions. Use each system
of units separately. Combining values from
the two systems may result in nonconformance with the standard.
2. APPARATUS
2.1
Apparatus,
specified in Tex-401-A.
2.2
Standard U.S. sieves,
meeting the requirements of Tex-907-K, in the following sizes:
4.75 mm (No. 4)
2.36 mm (No. 8)
1.18 mm (No. 16)
600
μ
m (No. 30)
300
μ
m (No. 50)
150
μ
m (No.100).
3. PROCEDURE
3.1
Determine particle size distribu
tion in accordance with Tex-401-A.
4. CALCULATIONS
4.1
Calculate Cumulative Percent Retained:
Cumulative Percent tained Cumulative Mass tained Mass of Total Samp
Calculate the Fineness Modulus (
FM
):
FM Cumulative percent retained
=
( ) / 100
4.3
Table 1 lists example amounts for discussion purposes.
Table 1—Amounts for Example Calculations
Sieve Size Cum. Mass Retained Cum. % Retained
4.75 mm (No. 4) 31.5 g 6.3
2.36 mm (No. 8) 99.1 g 19.8
1.18 mm (No. 16) 195.6 g 39.1
600
μ
m (No. 30)
306.7 g 61.3
300
μ
m (No. 50)
367.2 g 73.4
150
μ
m (No. 100)
482.8 g 96.5
(Dry Weight of Original Sample = 500.3 g)
Fineness Modulus = (6.3 + 19.8 + 39.1 + 61.3 + 73.4 + 96.5) / 100 = 2.964
Fineness Modulus = 2.96
5. REPORT
5.1
Report Fineness Modulus to the nearest 0.01.
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