Hot rolled asphalt

Surface macrotexture and skid resistance on the high speed road network is achieved by rolling Coated Chippings into the surface during installation. HRA is manufactured in accordance with EN 13108-4. Because of the rich mortar of fine aggregate, filler and binder in HRA the material is very durable and water resistant. The product will normally have a long life cycle ranging from 15 to 25 years. HRA mixtures can be manufactured with a range of coarse aggregate contents according to the end use:

• 30 or 35% coarse aggregate mixtures used as a Surface course layer for high speed roads - in conjunction with Coated chippings that are rolled into the surface to provide a positive macrotexture. 
• 55% coarse aggregate mixtures used as a Surface course layer for low speed roads. 
• 0% coarse aggregate mixtures used as protection to bridge deck waterproofing