Abstract:
Paper presented at the 26th Annual Southern African Transport Conference 9 - 12 July 2007 "The challenges of implementing policy?", CSIR International Convention Centre, Pretoria, South Africa. ABSTRACT: This study investigated the influence of accelerated weathering (aging) on the engineering properties of modified asphalt mixtures with pyrolysis polypropylene (PP). The accelerated weathering was done at a temperature of 85 °C and over two periods of time, namely between two and four days. Marshall specimens were compacted with a mechanical compactor at a temperature of 135 to 142 °C. Five pyrolysis polypropylene mixtures, including the control, which had an optimum asphalt content, were investigated. The asphalt concrete was of a dense-graded aggregate type of surface course conforming to the gradation limits of ASTM highway commission specifications. The results showed that variations in age change the physical properties of modified mixtures.
Description:
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