Warm mix asphalt with lower carbon emissions

Hawthorne Road is a wide, residential road in the London Borough of Bromley. The road has on street parking and acts as a bus route with several stops along its length. The existing surface was crazed, had multiple utility trenches and there was evidence of deformation which necessitated a deeper level construction than surface course only. The scheme needed bus diversions so the project had to be completed as quickly as possible to minimise disruption to bus passengers and residents. 

The London Borough of Bromley instructed Riney to plane off 85mm and lay 50mm of AC 20 HDM 40/60 binder course and 35mm of ULTIPAVE 10 40/60 PSV 60 surface course. In line with the London Borough of Bromley’s commitment to the use of sustainable materials, the binder course was to be supplied as a Warm Mix Asphalt and the ULTIPAVE used steel slag aggregate. The shorter curing time of Warm Mix Asphalt enabled Riney to plane off, lay the binder and overlay the surface course in one shift. This enabled the road to be opened in just one day as opposed to the two-day operation normally associated with two-layer construction. By halving the programme, disruption to road users was minimized and associated costs, such as traffic management reduced. 

The asphalt used to surface Hawthorne Road helped The London Borough of Bromley demonstrate its commitment to reduce CO2 emissions across its highways maintenance programme. The Warm Mix Asphalt reduced on site fumes by approximately 80% helping to achieve cleaner air targets in the capital and offering public health benefits. Tarmac delivered an innovative product which allowed Riney to exceed normal outputs and reduce the programme saving time and money. The London Borough of Bromley has committed to using Warm Mix Asphalt on future schemes.