‘Fillers’ such as lime are then added before the mixture is coated with bitumen. Quarry aggregate (crushed rock) and sand is combined in a rotating drum and dried at temperatures between 150 and 180 degrees Celsius to remove any moisture. How is asphalt made?Īsphalt is produced using a ‘fixed’ or ‘mobile’ plant. Tar is derived from coal and is not used in the modern Australian asphalt manufacturing process. Bitumen is, in fact, a key ingredient of asphalt - it is a sticky black or brown by-product of oil refining. Asphalt is sometimes incorrectly referred to as ‘bitumen’ or ‘tar’. Once hard, it provides a smooth but adhesive surface, making it suitable for road applications. It is laid in place while hot, hardening as it cools to ambient temperature. What is asphalt?Īsphalt is a durable, usually black-coloured material used for sealing and surfacing prepared areas. Clients often turn to Boral Australia for projects such as local road building and maintenance, through to highly complex major infrastructure programs including freeways, highways and airport runway resurfacing.
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