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- Minutes of Proceedings of the Institution of Civil Engineers, Vol. 58
Minutes of Proceedings of the Institution of Civil Engineers, Vol. 58
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Excerpt from Minutes of Proceedings of the Institution of Civil Engineers, Vol. 58: With Other Selected and Abstracted Papers, Session 1878-79, Part IV
Bituminous Concrete Foundations - The positions in which bi tumin -ous is preferred to cement concrete, have already been described. It is constructed in Liverpool as follows: On the hard but often irregular bed of the old foundation, previously well brushed, is thrown the required thickness of broken stone of the size of rough macadam. This is well levelled and rolled to the proper form, and -over it is poured precisely the same asphaltic composition as that above described for making the joints of sets. The asphalt sinks to the bottom, and fills the smallest crevices between the stones. On the surface, while the asphalt is still warm, is laid a thin stratum of small broken stone, which is thoroughly rolled into the asphalt, and fills up the upper spaces between the larger stones. As in the process of rolling the soft asphalt rises between the smaller stones, still smaller riddlin gs are scattered over it, until a perfectly true and uniform surface is obtained. In a few hours this surface will bear any amount of ramming without distortion.
The cost per square yard of bituminous concrete foundations in Liverpool, 6 inches deep, is as follows.
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