HW _6 Solutions

HW _6 Solutions - CEE 3020 Civil Engineering Materials...

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CEE 3020 Civil Engineering Materials SOLUTIONS Question 1 (a) What is the definition of fineness modulus? Ans. Fineness Modulus is a measure of the fineness of an aggregate; FM can be determined by adding the cumulative percentage of material retained on each of the standard sieves and dividing the sum by 100. According to the text, for fine aggregate, the sieves sizes used for fineness modulus calculations are #4, #8, #16, #30, #50, and #100, where generally for a fine aggregate 0% is retained on the #4. For coarse aggregate, the standard sieve sizes are 6 in., 3 in, 1.5 in., ¾ in., 3/8 in., #4, #8, #16, #30, #50, and #100. (b) Using the sieve analysis below, calculate the fineness modulus (FM) for the aggregate. Ans. Because a substantial amount of aggregate is retained on sieves larger than the #4, the standard sieves for coarse aggregate are used in this calculation (see definition in part (a)). FM = (45+76+100+100+100+100+100)/100 = 6.21

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This note was uploaded on 06/29/2009 for the course CEE 3020 taught by Professor Moser during the Spring '09 term at Georgia Institute of Technology.

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HW _6 Solutions - CEE 3020 Civil Engineering Materials...

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