GATE CE 2022 Set 2 — Question 64
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Question
It is given that an aggregate mix has 260 grams of coarse aggregates and 240 grams of fine aggregates. The specific gravities of the coarse and fine aggregates are 2.6 and 2.4, respectively. The bulk specific gravity of the mix is 2.3.The percentage air voids in the mix is ____________. (round off to the nearest integer)
Correct answer
8 to 8
Solution
1.Calculate the theoretical specific gravity () of the aggregate mix:
Where:g (weight of coarse aggregate)
g (weight of fine aggregate)
(specific gravity of coarse aggregate)
(specific gravity of fine aggregate)
2.Calculate the percentage of air voids ():
Where (bulk specific gravity of the mix)Final Answer: 8
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