Concrete Roads
and Their Construction
År: 1920
Serie: Concrete Series
Forlag: Concrete Publications Limited
Sted: London
Sider: 197
UDK: 625.8 Con-gl.
Being a Description of the concrete Roads in the United Kingdom, together with a Summary of the Experience in this Form of Construction gained in Australia, Canada, New Zealand and the United States of America.
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114
CONCRETE ROADS
The pavement as a whole was not reinforced except over bad
places in the. sub grade.
Building the 3-ft. shoulders was the last operation, the materia
employed being mostly that used for curing.
On the other hand all culverts and bridges were built during
the winter under the severe climatic conditions that exist in
Canada. They were all constructed of reinforced concrete, the
longest spans being 125 ft.
Concrete was laid in very low temperatures with no ill effect.
The danger lies in using frozen material and in allowing the
concrete to freeze before gaining its initial set.
Maintenance so far has been, a small item and is easily covered
by fines imposed upon motorists for speeding. The cracks are
cleaned out and filled with tar, heated to about 225° F. Coarse
dry sand is then sprinkled over, an excess of sand and tar being
used, and the traffic is allowed to iron it out.
Traffic along the road has far exceeded all estimates.