Difficulty: Easy
Correct Answer: In single-size aggregates, bulk density is maximum
Explanation:
Introduction / Context:
Bulk density of aggregate depends on how well particles pack together. Grading (distribution of sizes) determines how smaller particles fill voids between larger ones. Understanding this relationship is important for proportioning concrete and asphalt mixtures efficiently.
Given Data / Assumptions:
Concept / Approach:
Properly graded aggregate packs more efficiently because fines occupy voids between coarse particles, producing higher bulk density and lower void content. Single-size aggregate leaves many unfilled voids, giving lower bulk density. Hence, any statement claiming maximum bulk density for single-size aggregate is incorrect.
Step-by-Step Solution:
Verification / Alternative check:
Mix design guides show lower paste demand with well-graded aggregate (a consequence of higher packing density) compared with single-size aggregate blends.
Why Other Options Are Wrong:
They correctly express the relation between grading and packing density.
Common Pitfalls:
Equating particle angularity with grading effects; both influence bulk density but grading typically dominates.
Final Answer:
In single-size aggregates, bulk density is maximum
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