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By D. Raymond Sharp, J. L. Raikes and D. J. Silverleaf (Auth.)

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Extra resources for Concrete in Highway Engineering

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Blake and Brook (2) have analysed the various operations for major reinforced concrete roads. They concluded that the proportions of cost Concrete Roads 47 due to labour, plant and materials are 10%, 15% and 75% respectively. Expressed as a percentage of the total construction costs, the cost of aggregates, steel and cement are respectively 26%, 20% and 20%. Construction of Concrete Roads It is convenient to consider construction methods for concrete roads under three headings: (a) Small-scale road work.

Where a high standard of riding quality is required tamping should be off forms. The concrete is compacted by a hand-guided vibrating beam. Pneumatic, electric or petrol driven vibrating units mounted on wooden or steel beams are used for the purpose. It is important that the beam is allowed to sink down to form level under its own weight and then lifted up and replaced on a fresh area of uncompacted concrete. The beam should not be allowed to move along under the propelling action of the vibrators.

With this design, drainage from the central 44 Concrete in Highway Engineering reservation onto the carriageway surface is eliminated and run-off from the carriageway lanes is split and flows to both edges. The necessary cambers can conveniently be formed using straight lines instead of curves in major road construction. Recent experience of wide carriageways has also shown that the practice of permitting surface water to trickle onto the soil at the carriageway edges is not entirely satisfactory.

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