GATE CE 2024 Set 2 — Question 46
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Question
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(A) The load penetration curve of CBR test may need origin correction due to the non-vertical penetrating plunger of the loading machine.; (C) Grading of normal (unmodified) bitumen binders is done based on viscosity test results.; (D) In compacted bituminous mix, Voids in the Mineral Aggregate (VMA) is equal to the sum of total volume of air voids (Vᵥ) and total volume of bitumen (V_b).
Solution
(B) Incorrect. The Los Angeles abrasion test determines hardness (resistance to wear), while the aggregate impact test determines toughness (resistance to impact). The statement swaps these.
(C) Correct. Per IS 73:2013, paving grade bitumen is classified into four grades (VG-10, VG-20, VG-30, VG-40) based on absolute viscosity at .
(D) Correct. VMA is the volume of intergranular void space between the aggregate particles of a compacted paving mixture that includes the air voids and the effective bitumen content ().
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