Abstract
The asphalt paving industries are faced with two major problems. These two important challenges are generated with an increase in demand for environmentally friendly paving mixtures and the problem of rapidly rising raw materials. Recycling of reclaimed asphalt pavement (RAP) is a critical necessity to save precious aggregates and reduce the use of costly bitumen. Warm Mix Asphalt (WMA) technology provides not only the option of recycling asphalt pavement at a lower temperature than the temperature maintained in hot mixtures but also encourages the utilization of RAP and therefore saves energy and money. This paper describes the feasibility of utilizing three different WMA additives (organic, chemical and water containing) at recommended contents with different percentages of RAP. The mechanical properties and cost-benefit analysis of WMA containing RAP have been performed and compared with WMA without RAP. The results indicated that, 30%, 10% and 20% can be accepted as an optimum RAP addition related to organic, chemical and water containing additives respectively and organic additive with 30% RAP content has an appreciable increase in tensile strength over the control mix. It was also concluded that the RAP with WMA technology is the ability to reduce final cost compared to HMA and WMA mixtures.
Highlights
Recycling of bituminous materials has generated considerable discussion and development in the last decade
Six replicates of each Warm Mix Asphalt (WMA) samples were prepared for bitumen testing
Asphalt mixtures containing bitumen with higher Penetration Index (PI) are more resistant to low temperature cracking as well as permanent deformation [43]
Summary
Recycling of bituminous materials has generated considerable discussion and development in the last decade. While it is not a new idea, recent studies appear to be in response to the desire of many countries to reduce their dependency on imported crude oil and the derivative product as bitumen. Utilization of Recycled Asphalt Concrete with Warm Mix Asphalt development of recycling is ecologically safe and energy saving from the viewpoint of global environment production [1, 2]. Based on continuous accumulation of performance data, field and laboratory evaluations of recycled mixes, it is expected that recycling will continue to be the most attractive rehabilitation technique [6]. The choice of rehabilitation technique should be based on energy conservation, economic and engineering consideration, environmental effects
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