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 THE UNITED KINGDOM—PROVINCIAL
31
A regular motor-bus service, as well as heavy traction engine
traffic, passes over the section daily.
Latest Report.—Mr. Andrew Warren, County Surveyor (Southern
Division) writing in November, 1920, stated : “The road is as good
to-day as when first reopened (January, 1920), and no com-
plaints have been received of its being slippery. The noise when
steel-tyred vehicles are running over the section is no greater
than when macadam was employed.”
Essex
Mountnessing.—This road, which was laid in 1915, is one of peculiar
interest, inasmuch as the sides of it are composed of reinforced
concrete, whilst the centre track, a little over 11 ft., is of water-
bound macadam. Mountnessing is on the main road between
London and Colchester. The length of the section under notice
is about three-quarters of a mile, and the width 22 ft. 4 in.
The subsoil in this locality is clay, but as in early days this road
Fig. 21.—Section : Road at Mountnessing, Essex.
from time to time had been dressed with gravel it was on the latter
that the work of the new road was started. First of all the road
was excavated to a depth of 7 in., except at the side, where the
depth was 13 in. to provide for the kerb. A layer of 3 in. of ashes
was placed on the loose gravel, then 1| in. of concrete, on which
the metal reinforcement was laid, and on the top of this 3j in.
of concrete. On either side of the road is a concrete kerb rein-
forced with one steel rod and sunk to a depth of 10 in. This
stands 3 in. above the surface of the road, and is 5 in. wide. The
kerbing was made and placed as the road progressed. The
width of the reinforced concrete on either side of the macadam
is 5 ft. 7 in., and supporting the macadam is a concrete abut-
ment running down from the level of the road to a depth of 8 in.
As regards the water-bound macadam, which extended to a depth
of 3 in., it is the old material scarified and a thickness of 2 in. of
new macadam rolled into it and water-bound.
The whole of the concrete was made up of three parts of crushed
ballast, graded so as not to exceed 1 in., one part of washed sand,
and one part of cement,