Problem IV refers to questions 12 through 15 Sieve analysis results for an aggre

Question

Problem IV refers to questions 12 through 15 Sieve analysis results for an aggregate sample show 100% passing 1-inch sieve, 95% passing ¾ inch sieve, 88% passing ½ inch sieve, 79% passing 3/8-inch sieve, etc. The aggregate sample has 4.5% absorption and a moisture content of 7%. 12. What percentage of material is retained on the ½-inch sieve? A) 5% B) 7% C) 9% D) 12% 13, what percentage of material is coarser than ½-inch? A) 5% B) 7% C) 9% D) 12% 14. What percentage of material is finer than 3/8- inch? A) 79% B) 21% C) 88% D) 12% 15. In order to bring the aggregate to saturated surface dry (SSD) condition, you would: A) Add water to the aggregate B) Dry the aggregate C) Need to determine the bulk weight of the aggregate to answer D) None of the above

Explanation / Answer

Prob.12.

(A) 7%

Total finer than 1/2 inch = 12%, As 5% is already retained in 3/4 inch sieve, so mass retained on 1/2 inch = 12-5 = 7%

Prob. 13

(D) 12%, because 88% passed, so 12 % is coarser.

Prob. 14

(A) 79%

79% passes 3/8 inch sieve, so 78% is finer.

Prob. 15

(B) Dry the aggregate,

Moisture content is 7% > absorption, so water needs to be dried or wiped off with some dry cloth.

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