| 摘要 |
2122243 9309070 PCTABS00022 A method of treating a surface with a sprayed composition including bitumen to form a membrane and which comprises providing a raw material supply of bitumen which is heated to 140·C, and an alkaline supply of blending water which are heated and then blended to form a blended mixture/emulsion, and then pumped when required through a first delivery line to a first discharge head, and a further supply of water which is treated to be acidic is pumped along a second delivery line to a second discharge head, in which the first and second discharge heads are positioned close to each other and arranged to direct respective streams of the blended mixture and the acidic water to impinge one upon the other downstream of the delivery heads to form a dispersed spray which is then applied to the surface to be treated, and which then cures rapidly to form a membrane on the surface. The method of the invention and the components of the spray composition enable bituminous coatings to be applied without need for high temperature application as used in existing hot coating application of asphalt bitumen.
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