This is one in a series of Traffic Advisory Leaflets providing guidance on methods of working and innovative techniques aimed at reducing traffic congestion due to road works. The series is aimed at utility companies, highway authorities, contractors, equipment suppliers and others involved in road (or street) works. Each leaflet in this series is based on research carried out by TRL Limited on behalf of the Department for Transport and Transport for London. This Traffic Advisory Leaflet covers the use of cementitious mixtures in road work reinstatements and provides guidance on what is required before they can be trafficked or overlaid. The Specification for the Reinstatement of Openings in Highways (SROH) specifies how cementitious mixtures can be used. Use of cementitious mixtures outside the scope of SROH will require the agreement of the highway authority. Cementitious mixtures, including high early strength mixtures, are used to replace cementitious and unbound materials; they are not generally used to replace asphalt. Cementitious mixtures used in highway construction and maintenance works generally fall into three categories. In order of declining strength, they are: Concrete; Cement Bound Granular Mixtures (CBGM); and Foamed Concrete for Reinstatement (FCR). These mixtures are used for different purposes. Typically, concrete is used to replace cementitious material in rigid pavements, CBGM is used to replace cementitious material in composite pavements, and FCR can be used to replace unbound materials in the base and sub-base of flexible roads and in footways. (Author/publisher)
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