oa Civil Engineering = Siviele Ingenieurswese - Rates of spread and spray in bitumenous surface-dressing or roads



A simple apparatus, measuring the volume of chips required to cover a standard area, gives the spread ratio directly on a dipstick reading and allows automatically for the shape of the chips. The spray rate for bitumen is determined jointly from the measured voids between chips, the nature and intensity of traffic and the texture of the existing road surface. A nomogram obviates calculations. To allow for contraction and evaporation, a table of application factors is given.


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