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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/1719

Title: Performance of various modified binders in road trials and under simulated crack movement in the laboratory
Authors: Rust, FC
Servas, VP
Van Der Walt, N
Keywords: Cracks
Overlays
Seals
Rainwater
Potholing
Deformation
Issue Date: Jun-1989
Publisher: Asphalt Pavements for Southern Africa
Citation: Rust, FC, Servas, P and Van Der Walt, N. 1989. Performance of various modified binders in road trials and under simulated crack movement in the laboratory. 5th Conference on Asphalt Pavements for Southern Africa, Swaziland, 5-9 June 1989, pp 56-67
Abstract: The use of bitumen-rubbers and other modified binders to inhibit reflection cracking, highlighted the need to investigate the phenomena of load-associated crack movement and crack reflection and the evaluation of the field performance of modified binders. The development of the Crack-activity Meter (CAM)and its use with the Heavy Vehicle Simulator (HVS) has led to an improved understanding of crack movement behaviour. The N3 trial sections, which were built to determine the field performance of various modified binders under normal traffic, as well as initial rsults from this experiment are discussed in this paper. To date, fatigue testing under simulated crack movement in the laboratory was conducted on four of the binders used in the N3 trials. Initial results from this work, including fatigue curves of the four materials, are reported. Guidelines are suggested for the identification of sections on pavements where crack reflection problems can be expected. Models were also developed to predict crack movement from a knowledge of block sizes and structural parameters such as basin of deflection and an example of this is shown. It is also shown that these models can be used to predict the decrease in crack movement due to the overlaying of a pavement with a structural layer. It is concluded that the measurement of an analysis of crack movement can aid rehabilitation design.
Description: 1989: 5th Conference on Asphalt Pavements for Southern Africa, Swaziland
URI: http://hdl.handle.net/10204/1719
ISBN: 620143959
Appears in Collections:Infrastructure engineering
General science, engineering & technology

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