| 摘要 |
<p>A quick-setting composition for the construction of roads, floors, and the like comprises a cement (e.g. Portland cement), an aqueous emulsion of rubber (e.g. latex) in an amount such that the dry rubber does not substantially exceed 10 per cent of the whole mix, and a gelling agent for the rubber emulsion for accelerating the setting of the mix. The gelling agent may comprise "waste pickle" or a solution of ferrous chloride and hydrochloric acid, and iron powder may be added. In making a road, a number of layers of the composition may be applied, each succeeding layer containing a higher percentage of rubber than the preceding layer. For example, three layers may contain 3, 3 1/2 , and 5 per cent of rubber respectively. The composition may contain the usual broken stone and sand aggregate. In an example, a mix comprises 52 lbs. of broken stone of three-eights of an inch size, 22 lbs. of sand, 11 lbs. of cement, 2 lbs. of iron powder, 1 gallon of 40 per cent latex and 160 grms. of casein dissolved in one quart of water and 240 cc. of waste pickle. Specification 273,961, [Class 70, Indiarubber &c.], is referred to.</p> |
