Effect of Styrene-Butadiene-Styrene on the Properties of Asphalt and Stone-Matrix-Asphalt Mixture

This study investigates the benefits of modifying asphalt and stone-matrix-asphalt (SMA) mixtures in flexible pavement. 70/100-penetration-grade asphalt cement and 5% styrene-butadiene-styrene (SBS) triblock copolymer were selected. Unmodified and modified asphalt binders were subjected to physical...

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Bibliographic Details
Published in:Journal of materials in civil engineering 2011-04, Vol.23 (4), p.504-510
Main Authors: Al-Hadidy, A. I, Yi-qiu, Tan
Format: Article
Language:English
Subjects:
Applied sciences
Asphalt
Binders
Bitumen. Tars. Bituminous binders and bituminous concretes
Buildings. Public works
Compressive strength
Exact sciences and technology
Materials
Pavements
Performance tests
Road construction. Pavements. Maintenance
Service life
Shape memory alloys
Surfacing
TECHNICAL NOTES
Tensile strength
Transportation infrastructure
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Summary:This study investigates the benefits of modifying asphalt and stone-matrix-asphalt (SMA) mixtures in flexible pavement. 70/100-penetration-grade asphalt cement and 5% styrene-butadiene-styrene (SBS) triblock copolymer were selected. Unmodified and modified asphalt binders were subjected to physical and compatibility tests. Performance tests, including Marshall stability, static indirect tensile strength and static compressive strength at 25 and 60°C, tensile strength ratio, index of retained strength, rutting resistance, low-temperature cracking, and resilient modulus, were conducted on unmodified and SBS-modified SMA mixtures. The regression relationships between the performance tests were obtained. A mechanistic-empirical design approach was used to estimate the improvement in service life of the pavement or the reduction in thickness of the SMA and base layer for the same service life caused by modifying the SMA mixtures. The test results show that SBS-modified asphalt mixtures perform better than control mixtures. Temperature susceptibility can be reduced by including SBS in the asphalt mixture. The results of multilayer elastic analysis indicate that using SBS-modified SMA as surface layer in pavements reduces the number of construction materials used. Actual savings would depend on the designer’s decision in reducing the thickness of an individual layer.
ISSN:0899-1561
1943-5533
DOI:10.1061/(ASCE)MT.1943-5533.0000185