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Singapore, Singapore

Fang F.T.,National University of Singapore | Chong Y.C.,Land Transport Authority | Nyunt T.T.,Land Transport Authority | Loi S.S.,NSL Chemicals Ltd
International Journal of Pavement Research and Technology | Year: 2013

Sustainable road construction is now one of the major interests of highway authorities. In this study, recycled material (steel slag aggregates) was used to replace granite aggregates in the construction of a porous pavement surface course. Besides using recycled aggregates, the asphalt mixture was designed to achieve improved environmental sustainability performance by providing enhanced wet-pavement skid resistance and visibility of road markings in wet weather conditions, and reduced tyre-pavement noise. Two new asphalt mix types using steel slag aggregate of different gradations (i.e. maximum aggregate size of 13.2 mm and 16 mm) were tested in the laboratory and the performance monitored on the site. From the results obtained from field monitoring tests, it was observed that the new asphalt mixes provided sufficient drainage of water, displayed comparable wet-pavement skid resistance and better reduction in tyre-pavement noise as compared with the other types of asphalt mix currently used in Singapore. © Chinese Society of Pavement Engineering. Source

Boon S.K.,NSL Chemicals Ltd | Yiying H.,NSL Chemicals Ltd | Lu E.C.,NSL Chemicals Ltd | Nyunt T.T.,Land Transport Authority | And 3 more authors.
SEAISI Quarterly (South East Asia Iron and Steel Institute) | Year: 2015

In Singapore, steel slag has been used for dense wearing course construction for areas with challenging traffic conditions such as slip roads and intersections. Recently, new collaborative research was conducted to develop new steel slag asphalt mixes for expressway. The new mixes are designed with 15% air void for enhanced durability with good skid resistance and adequate permeability for expressways. Two mixes were developed, each with 16 mm and 13.2 mm maximum aggregate size respectively. Testing showed that the steel slag aggregates possessed superior physical and geometrical properties compared with granite aggregate and the mix specimens showed satisfactory Marshall stabilities in lab. Field trials were conducted with two control pavements, namely, drainage mix (20-26% air voids) and OGW (7-9% air void). Field tests showed comparable skid resistance of the four pavements four months into the service life. The two steel slag pavements delivered better noise reduction. The 13.2 mm mix generated tire pavement noise 2-3 dBA lower than the control pavements at 80 km/h. IRI of all pavements were lower than 2 mm/m. Source

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