THE EFFECTS OF ADDING RECLAIMED ASPHALT PAVEMENT (RAP) AND CEMENT ON THE PROPERTIES OF PAVEMENT BASE COURSE
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Abstract
Reclaimed Asphalt pavement (RAP) is removed using a milling machine which grinds the asphalt into small pieces and it is a useful alternative to virgin materials because it reduces the use of virgin aggregate. Base course is a layer that comes under the surface layer of asphalt pavement and consists of gravel materials with lower specifications than the surface layer. The main aim of this research is to evaluate using reclaimed asphalt pavement and Portland cement as stabilizer to the base course materials. Different amount from RAP materials were added to the base course soil by weight. The RAP percentage added are 5%, 10%, 15%, 20% and 25% with fixed amount of cementing 2% for all mixtures. Different tests were conducted sieve analysis, Los Angelos Abrasion, Modified Proctor and California bearing ratio. The results showed that adding recycled asphalt to the base soil improved all mixtures properties with different rate. After adding recycled asphalt and cement, the sieve size analysis of the mixtures with different proportions of components still falls within the limits of the Egyptian standard. There is a noticeable improvement in the wear value for the mixture, 20% recycled asphalt and 2% cement, with a value of about 15%, and this value is good for improving the wear resistance of the mixture. The dry density value increase by 10% for the mixture, contain 20% recycled asphalt and 2% cement. California bearing ratio test result indicate that adding recycled asphalt to the soil improve the bearing capacity of soil that can be used as base course of pavement. The whole results of the research give good indication for pavement full depth recycling and reuse it as anew base course layer.
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