Abstract
Now a-days, the cost of asphalt pavement materials have been increasing excessively, which led to find alternative materials which must be cheaper than that of asphalt pavement materials. In addition, more concerns are pointed to reserving natural resources and reducing environmental impacts of using virgin asphalt binders, thus more attention is focused on the use of recycled materials in pavement designs. The main purpose of this study is to investigate the effect of water on the use of reclaimed asphalt pavement materials in bituminous mix and to determine the optimum percentage of reclaimed asphalt pavement materials with virgin pavement materials and optimum days of water submergence according to the Marshall Mix design criteria based on medium traffic condition. To achieve the objectives of this study the basic properties tests were performed on the studied materials and then Marshall Test was conducted on asphalt mixtures with different percentages of reclaimed asphalt pavement materials with optimum bitumen content determined for 100% fresh aggregate. The different percentages of reclaimed asphalt pavement material in asphalt mixtures are 0%, 10%, 20%, 30% and 40%. Marshall Criteria was satisfied up to 20%. Then the specimen prepared with 20% reclaimed asphalt pavement material was submerged in water at 0, 5, 10, 15 and 20 days. Optimum days of water submergence was 15 days on the basis of Marshall mix design criteria.
Highlights
Reclaimed asphalt pavement (RAP) creates a mean for reusing materials that optimizes the use of natural resources
Hot mix recycling is the process in which reclaimed asphalt pavement materials are combined with new materials, sometimes along with a recycling agent, to produce hot mix asphalt (HMA) mixture The two steps in the mix design procedure are material evaluation and mix design
Optimum bitumen content The optimum bitumen content is the minimum bitumen content at which maximum density of bituminous paving mix is obtained by averaging the bitumen content for maximum unit weight, bitumen content for maximum stability and bitumen content for 4 % air voids
Summary
Reclaimed asphalt pavement (RAP) creates a mean for reusing materials that optimizes the use of natural resources. RAP is an economical alternative to virgin materials because it reduces the need to use virgin aggregate, which is a scare material many parts of Bangladesh. It reduces the amount of binder required in the production of asphalt paving mixtures. It helps to conserve natural resources and reduce the amount of land for the disposal of these materials. Hot mix recycling is the process in which reclaimed asphalt pavement materials are combined with new materials, sometimes along with a recycling agent, to produce hot mix asphalt (HMA) mixture The two steps in the mix design procedure are material evaluation and mix design
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