project ’ s engineering design and the capability of the asphalt plant . Warm mix asphalt — a technology that has gained acceptance globally because of its environmental and other benefits — can make use of a significant percentage of recycled material . In May 2016 , the Road Pavement Forum in South Africa approved a resolution to scope guidelines for the inclusion of secondary materials in roads .
According to Mhlongo et al . ( 2014 ), RAP is one of the most recycled materials in the world . However , studies conducted in Europe and the US show that while 80 % of the recycled material is reused in the construction of roads , strict regulation often allows for a maximum of 50 % RAP in the production of new hot mix asphalt ( HMA ) mixtures .
Road Pavements Forum
The South African Road Pavement Forum ( RPF ) was established in August 2000 to provide a forum for sharing and debating road-related matters relevant to the South African roads industry .
The RPF makes provision for wider representation and participation from the broader roads industry , particularly urban and provincial authorities , tertiary institutions , and contractors , and also allows for broader regional representation . RPF objectives include :
• Providing a perspective of overarching strategic issues as it affects pavement engineering ;
• Promoting best practice ;
• Co-ordination and linkage with other groupings ;
• Establishment of task groups with specific national objectives ;
• Provision of sufficient time for participation / discussion / advice and for social interactions ;
• Dissemination of new technologies ;
• Provision of a forum for acceptance of technological changes ; and
• Provision of a forum for interaction between theory and practice and for identification of technology development needs .
Pixabay
The drive to increase the use of recycled materials in construction and road building , coupled with the requirement to decrease CO 2 emissions , has led to increasing focus on recycled or reclaimed asphalt paving ( RAP ).
28 _ QUARRY SA | NOVEMBER 2017