By D. Raymond Sharp, J. L. Raikes and D. J. Silverleaf (Auth.)
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Additional info for Concrete in Highway Engineering
CORNER AND EDGES OF SLABS It is readily apparent that for any given load the edges and corners of a concrete slab are stressed more highly than the middle portion. If a balanced design is to be produced, it follows that the edges and corners should be strengthened. This can be done by thickening the outer edges of slabs, constructing concrete sleeper beams under joints and edges of roads or by increasing the amount of reinforcement at the edges. None of these methods has proved entirely satisfactory or advantageous in practice and the best method of coping with the problem is probably to prevent traffic running over the edges of slabs and by providing load transfer devices at joints so that slabs give support to one another.
The life of the concrete running surface is considerably greater than that of any bituminous surfacing. An investigation carried out by the Road Research Laboratory (1) has shown that the concrete roads surveyed, which were of pre-war and early post-war construction, had an average life of 27J years. Modern roads will undoubtedly improve on this figure. The amount of money spent in maintenance of these roads was rather less than Jd. per sq. yd per year. When concrete slabs reach the end of their useful life as a running surface they can then form the base—which will be virtually everlasting —for a bituminous surfacing.
The finishing pass should be made soon after the compacting operation and the beam should be tilted slightly so that the leading edge is about f in. higher than the trailing edge to facilitate the striking off of any small quantities of excess concrete. Concrete Roads 55 It is often difficult to remove all irregularities in a concrete road with a hand-guided vibrating beam, but the use of a scraping straight edge will ensure a surface well within the usual specified tolerance of \ in. in 10 ft.
Concrete in Highway Engineering by D. Raymond Sharp, J. L. Raikes and D. J. Silverleaf (Auth.)