Understanding ASTM C33 Requirements for Fine Aggregates
Learn about the key requirements of ASTM C33 for fine aggregates, including limits on retained percentages, fineness modulus, and the influence of fine aggregate amounts passing specific sieves on concrete properties like workability and surface texture.
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Presentation Transcript
Other requirements of ASTM C 33 are: 1. The fine aggregate must not have more than 45% retained between any two consecutive standard sieves. 2. The fineness modulus must be not less than 2.3 nor more than 3.1.
The amounts of fine aggregate passing the 300 m (No. 50) and 150, m (No. 100) sieves affect workability, surface texture, air content, and bleeding of concrete. Most specifications allow 5% to 30% to pass the 300 m (No. 50) sieve. For hand-finished concrete floors, or where a smooth surface texture is desired, fine aggregate with at least 15% passing the 300 m (No. 50) sieve and 3% or more passing the 150 m (No. 100) sieve should be used.
Fineness Modulus. Fineness Modulus. The fineness modulus (FM) of either fine or coarse aggregate according to ASTM C 125 is calculated by adding the cumulative percentages by mass retained on each of a specified series of sieves and dividing the sum by 100.
Table Table 2 2. . Determination of Fineness Modulus of Fine Aggregates Determination of Fineness Modulus of Fine Aggregates
