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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/1729

Title: Heavy Vehicle Simulator aided evaluation of overlays on pavements with active cracks
Authors: Viljoen, AW
Freeme, CR
Servas, VP
Rust, FC
Keywords: Cracks
Road construction
Heavy vehicle simulator
Issue Date: Jul-1987
Citation: Viljoen, AW. 1987. Heavy Vehicle Simulator aided evaluation of overlays on pavements with active cracks. 6th International Conference on Structural Design of Asphalt Pavements, Michigan, USA, July 1987, pp 701-709
Abstract: Conventional overlay life estimates are often invalidated by the reflection of existing cracks in a pavement through an overlay. This is attributable to a lack of understanding of the factors influencing relative crack movements and their mechanisms. Inadequate knowledge of the ability of overlay techniques to tolerated induced strains originating from the discontinuities in the existing overlay pavement also contributes to the problem. This paper identifies the factors and mechanisms and illustrates their effects by means of field data from actual pavements. The South African Heavy Simulator was also used to evaluate a variety of conventional and innovative asphaltic overlays on a severely cracked concrete pavement of which the mechanisms and extent of relative crack and joint movements were determined prior to overlay placement. The results of this testing programme are discussed with special emphasis on the eability of the overlays to inhibit reflection cracking. It is believed that the improved knowledge of the parameters involved in reflection cracking will contribute to more realistic prediction models and result in more cost effective rehabilitation strategies.
URI: http://hdl.handle.net/10204/1729
Appears in Collections:Infrastructure engineering
General science, engineering & technology

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