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A Review of the Road Performance of Bitumen-Rubber in South and Southern Africa
Author(s):
Renshaw, R.H., Tosas (PTY) Ltd.
Origin:
International, South Africa
Date:
1989
Categories:
Performance
Key Words:
Summary:
This paper will review the experience gained from the use of bitumen (asphalt)-rubber I South Africa and states in
Southern Africa (Swaziland and Botswana) over a 5 - 7 year period.
The Arm-R-Shield of Arizona Refining of Phoenix, Arizona was first introduced to South Africa in October 1982, followed
nine months later by a locally developed technology based on an Australian method. The Sahuaro technology was
introduced later. The main reason for the introduction of bitumen-rubber was to successfully deal with or entirely
eliminate the problem of reflection cracking.
This paper will deal with the important issue of the correlation of laboratory test data and binder performance on the
road. Specification limits are suggested based on the testing of approximately 1 600-field samples. Limits cover
resiliency, spray temperature, flow, softening point, and site viscosity. Binder characteristics are also classified in order
of importance for the optimum performance of roads with a crack reflection problem.
The paper will also discuss road sections laid in South Africa to evaluate solutions to the crack reflection problem. A
jointed concrete pavement was successfully overlayed using bitumen-rubber. The basis for evaluating the old
pavement was relative vertical movement at the joints.
Developments from the introduction of bitumen-rubber were the design and manufacture of the Crack-Activity-Mater (the
CAM), and the use of the Sliding Plate Rheometer to identify effects of various mix variables and a rational design
method for bitumen-rubber seals.
Author(s):
Renshaw, R.H., Tosas (PTY) Ltd.
Origin:
International, South Africa
Date:
1989
Categories:
Performance
Key Words:
Summary:
This paper will review the experience gained from the use of bitumen (asphalt)-rubber I South Africa and states in
Southern Africa (Swaziland and Botswana) over a 5 - 7 year period.
The Arm-R-Shield of Arizona Refining of Phoenix, Arizona was first introduced to South Africa in October 1982, followed
nine months later by a locally developed technology based on an Australian method. The Sahuaro technology was
introduced later. The main reason for the introduction of bitumen-rubber was to successfully deal with or entirely
eliminate the problem of reflection cracking.
This paper will deal with the important issue of the correlation of laboratory test data and binder performance on the
road. Specification limits are suggested based on the testing of approximately 1 600-field samples. Limits cover
resiliency, spray temperature, flow, softening point, and site viscosity. Binder characteristics are also classified in order
of importance for the optimum performance of roads with a crack reflection problem.
The paper will also discuss road sections laid in South Africa to evaluate solutions to the crack reflection problem. A
jointed concrete pavement was successfully overlayed using bitumen-rubber. The basis for evaluating the old
pavement was relative vertical movement at the joints.
Developments from the introduction of bitumen-rubber were the design and manufacture of the Crack-Activity-Mater (the
CAM), and the use of the Sliding Plate Rheometer to identify effects of various mix variables and a rational design
method for bitumen-rubber seals.
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