Evaluation of a warm-mix asphalt additive
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While some fields of civil engineering endeavour, and some materials, are heavily researched and published, the performance of construction materials and systems attracts far less interest and coverage
Construction Materials from the Institution of Civil Engineers is a recent addition to the suite of ICE Proceedings, and has been established with the aim of encouraging research and practical discussion in the field of performance of construction materials and systems.
Construction Materials addresses, among other subjects
applications of new materials
re-evaluation of traditional materials
innovative and recycled materials
novel applications of materials such as cement and concrete
The journal is edited by a distinguished editorial advisory panel and has a broad scope to embrace engineers working in both design and construction.
Construction Materials covers areas such as the procurement, specification, application, development, performance and evaluation of all materials used in construction and civil engineering. Coverage is also provided of the aspects which need to be taken into account when selecting materials: including embodied energy, environmental impact, service life, refurbishment, recycling and reuse.
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Although several warm-mix asphalt projects have been explored in the USA, Europe, and some countries in Asia, there is a need for the research to evaluate the applicability of warm-mix asphalt in Thailand. In this study, the fundamental properties of bitumen modified with one of the commonly used additives (Sasobit, a long-chain aliphatic hydrocarbon (LCAH)) were evaluated. The properties evaluated included the viscosity, rheological properties, rutting, and fatigue resistance. In addition, the compactability of the mixtures was also investigated to determine whether they could reach the desired density at lower temperatures. It was found that the LCAH modification improved the workability and the fundamental properties of bitumen as shown in better rutting and fatigue resistance, and also in higher complex shear modulus. The measurement of the compactability showed that less energy was required to compact the LCAH-modified asphalt mixtures to the desired density even at 20–40°C below compaction temperature. The mixtures modified with the LCAH had greater resistance to densification under traffic or higher potential to resist permanent deformation. The LCAH had no effect, however, on the resistance of asphalt mixtures to moisture damage, but the reduction of mixing and compaction temperatures could have a detrimental effect on the moisture sensitivity.
- Keywords:
pavement design;
bitumen & tar
- Document Type: Research Article
- DOI: 10.1680/coma.2008.161.1.1
- Affiliations:
1: Transportation Engineering Program, School of Engineering and Technology, The Asian Institute of Technology Bangkok, Thailand;
2: Civil and Environmental Engineering, Washington State University Pullman, Washington, USA;
3: Department of Civil and Environmental Engineering, The University of Wisconsin-Madison Madison, Wisconsin, USA;
4: Department of Civil and Environmental Engineering The University of Wisconsin-Madison Madison, Wisconsin, USA
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