Bitumen emulsions for cold mixes and road surfacing

摘要

Bitumen emulsion (I) for the prodn. of cold mix or road surfacing contains 50-99 wt.% bitumen (II) and 1-50 wt.% flux component (III) consisting of a vegetable oil such as rapeseed oil, a deriv. thereof such as the fatty acid component or fatty acid mixt., a transesterification prod. such as rapeseed oil methyl ester, or alkyd resin-contg. derivs. of rapeseed oil. This binder phase is emulsified in an aq. phase, and the emulsion may also contain additives, coupling agents, emulsifiers, drying agents, elastomers and/or crosslinkers, etc. Also claimed is a cold mix contg. 3-10 wt.% pref. binder phase (see below), 90-94 wt.% stone chips and opt. emulsion breakers such as salts, alkalis or acids. Also claimed is a process for surfacing roads, paths or embankments etc., by spraying emulsion (I) on the base at the rate of 0.8-1.5 kg effective binder per m<2>, spreading on the stone chips, opt. rolling, and sweeping up the excess.