This article shows how the road maintenance industry is responding to demands for speed and safety, and describes some of its new methods. The combination of high traffic flows with the overloading and ageing of roads is creating a rising demand for repair, improvement, and rebuilding to combat massive congestion. Maintenance engineers have developed several proprietary cold mix materials, to reduce the time taken in road patching. They could be the most cost-effective solution, when actual 'on-site' behaviour is considered. Many of the new mixtures use polymer modified binders and carefully graded aggregates. Such high-performance mixes are designed to be more durable under adverse placement conditions such as: (1) cold weather; (2) where adjacent material has deteriorated; (3) where dirt and water are in the hole; and (4) where compaction is difficult. In the USA, where maintenance departments in about 20 states are using such materials, an average cold-patch life of 13 months has been reported, compared with 21 months for a carefully applied hot-mix patch. A good example of a permanent cold-patch system is described. For larger areas of asphalt carriageway repair, great advances have been made in materials recycling, including recycled old concrete pavements. The use of thin-layer high-performance overlays is growing rapidly.


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Filing Info

  • Accession Number: 00729847
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Dec 26 1996 12:00AM