PROBLEMS ASSOCIATED WITH THE DESIGN AND MAINTENANCE OF RESIDENTIAL STREET PAVEMENTS

Current pavement design and maintenance practices in the city of Woodville, South Australia, which has some 470km of paved roadway, are discussed. Design is on the basis of CBR/commercial vehicles/thickness curves. Initially a comprehensive testing program established in situ subgrade CBR's for the range of soil types encountered and now subgrade soil has only to be identified for estimation of its CBR. Generally thickness for residential streets is 125-150 mm. For feeder roads thickness is 200 mm and base course is carried under the kerb and channel. For maintenance treatments deformation is the main criterion; cracking has occurred but does not lead to rapid deterioration. Resheeting is generally necessary on pavements 12 to 17 years old and usually 25 mm of bituminous concrete is used. In determining priorities for resheeting, factors taken into account include pavement distress and extent, roughness, pavement history as well as recent and future work by service authorities. (Author/TRRL)