Poly(methyl methacrylate)-Modified Road Tars for Surface Dressing Applications. Part 1: Laboratory Investigation. Part 2: Full-Scale Surface-Dressing Trial

摘要

The purpose of the experiments was to develop polymer-modified road tars based on the addition of poly(methyl methacrylate) to low-temperature tar. Scrap 'Perspex' turnings and selected commercial grades of methyl-methacrylate copolymers and homopolymers were added to a low-temperature tar from Coalite and Chemical Products Ltd. It was found that 'Perspex' turnings and the selected 'Diakon' copolymer grades could not be satisfactorily incorporated in the low-temperature tar. Two homopolymers gave good blends; a tar containing 1% Acrylic Granules DP 300 exhibited a high degree of elasticity, improved resistance to low temperature and impact, and could be sprayed through a conventional sprayer-jet at normal temperatures and pressures. A full-scale surface-dressing trial was carried out in September 1977 on the B6013 at Higham, Derbyshire, using tar containing Acrylic Granules DP 300. The polymer-modified binder was prepared on this larger scale with only minor difficulty and was successfully sprayed through a normal spray-bar. The surface dressing gave good performance in service.