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—SCOTLAND
63
was allowed ; on top of this another 2 in. of concrete of the
same proportions as the bottom layer was placed, and above this
was laid the finishing coat, 2 in. thick. The work was so carried
on that no layer was set before the other was superimposed
upon it.
The two bottom layers consisted of three parts 1 i-in. machine-
broken whinstone metal, two parts sharp sand, and one part
cement, while the finishing coat was of two parts Ho 1-in. whin-
Fig. 42.—Road prior to reconstruction, Canmore Street, Dunfermline.
stone metal chips, two parts granite ]-in. to dust, and one part
cement.
The surface contour was maintained by the putting in of pegs
every 4 ft. along the kerb line and at the crown of the roadway:
on these were laid (-in. laths from kerb to kerb, these being taken
up as the work proceeded.
hen the surface was about three-quarters set it was gone over
lightly with a bass broom, thus securing a “key” for the tar
spray ; it was thereafter covered over with fine sand which was
kept moist for seven days and removed at the end of fourteen days.
On the work being completed, the surface—with the exception