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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IN OTHER COUNTRIES
107
to foi’rn two thicknesses, and these were placed approximately
56 ft. apart, the length of bay laid being 14 ft., and four bays
a convenient length for a joint.
Out of 35,000 yds. laid, of which only 5,216 had been coated,
not a single crack had been discovered between the bays, and
only in Little Queen Street and Park Road, in which shingle
concrete was used, were there any noticeable signs of wear. The
tarred paper joints and those formed by the junction of two hays
are coated with asphalt and fine shingle.
Australia
In Australia some experiments in reinforced concrete road con-
struction have been carried out at Melbourne and Sydney in the
suburban areas, notably on the St. Kilda Road, Melbourne, and the
New South Head Road, Sydney.
St. Kilda Road, Melbourne (West side).—An extended, and what
may, so far, be called a satisfactory test with a reinforced con-
crete road has been made by the South Melbourne City Council
on the west side of St. Kilda Road on a section within the
council’s jurisdiction. It was carried out under the supervision
of Mr. A. E. Aughtie, M.Inst.C.E., City Surveyor. Five different,
but conjoint, sections of the road were laid with steel mesh
reinforcement—longitudinal and transverse, and triangular—
supplied by two different makers, and with plain concrete, in
order that a comparative test might be made of their relative
values. In March, 1914, one chain, of road was experimented
upon, 33 ft. being laid with plain concrete, and 33 ft. with con-
crete and longitudinal and transverse steel mesh reinforcement.
In June, 1915, 2| chains of plain concrete road were put down ;
at the same time half a chain of concrete road with triangular
mesh reinforcement was laid. In March, 1916, half a chain of
concrete road with longitudinal and transverse mesh reinforce-
ment was constructed.
The reinforcement in the several instances mentioned was laid
in concrete 6 in. thick, while the plain concrete road was 6-8 in.
The concrete mixture for the various tests comprised four parts
of blue stone screenings two parts of sand, and one of cement.
The width of the road so treated is 24 ft., with 3 ft. of channelling
on either side. The surface of the various sections was tar painted
and sanded.