GATE CE 2015 Set 2 — Question 63
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Transportation Engineering → Bitumen & Mix Design → Marshall Mix Design
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Question
In Marshall method of mix design, the coarse aggregate, fine aggregate, fines and bitumen having respective values of specific gravity 2.60, 2.70, 2.65 and 1.01, are mixed in the relative proportions (% by weight) of 55.0, 35.8, 3.7 and 5.5 respectively. The theoretical specific gravity of the mix and the effective specific gravity of the aggregates in the mix respectively are:
Correct answer
(A) 2.42 and 2.63
Solution
1.Theoretical Specific Gravity of the mix ():
Given: 2.Effective Specific Gravity of the aggregates ():
Assuming no bitumen absorption, is the combined specific gravity of the aggregates ():Thus, and . Option (A) is the closest match as it uses rounded values ( leads to ).Continue learning with Success Tracker
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