Where does the rolling operation commence during highway construction________________?
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Answer: A. sides and proceed to centre
Explanation
Rolling operations during highway construction conventionally commence at the outer edges and proceed progressively toward the center. Starting at the edges and moving inward preserves the designed transverse camber and prevents lateral displacement of mix. Compacting outward edges first provides essential lateral containment for unbound aggregate layers and bituminous base courses. Compaction is a critical construction process that increases soil and pavement density by reducing air voids through mechanical pressure. Roadway cross-sections are engineered with a specific crown and transverse slope to facilitate rapid surface water drainage. Heavy steel-wheel and pneumatic-tired rollers are standard compaction equipment utilized throughout various phases of pavement construction.
Option B suggests starting at the center, which would push material outward and destroy the required roadway crown. Option D implies any rolling pattern is acceptable, ignoring established construction practices necessary for structural integrity. Option C involves starting on one side only, creating an uneven cross-slope and differential compaction across the lane.
- Subject
- Engineering
- Category
- Civil Engineering
- Topic
- —
- Difficulty
- medium
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