Research Report 196 Trials of roadbase macadam containing EVA

Publication Year

1989

Document Status

Current

Abstract

Previous work has shown that the use of binders modified by the addition of EVA (ethylene vinyl acetate co-polymer) enhanced the properties of bituminous materials. The behaviour of roadbase macadams containing 5% by weight of EVA modified binders was compared with that of control lengths of conventional roadbase macadam in four motorway and trunk road contracts. The production, laying and compaction characteristics of the test materials were assessed together with the structural properties of samples measured in the laboratory. At frequencies and temperatures typical of conditions in the roadbase, the load spreading ability of the modified materials was similar to the control materials. The incorporation of EVA in roadbase materials would result in a 15 to 20% increase in production cost and would therefore be uneconomic for use in the roadbase.

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