A Comparative Study of Utilizing Two Kinds of Reclaimed Asphalt Pavement Materials in Hot Mix Asphalt

Document Type : Original Article

Authors

1 Department of construction engineering and utility - faculty of engineering - zagazig university

2 Department of Construction Engineering and Utilities, Faculty of Engineering, Zagazig University, Zagazig, Egypt

3 Civil Engineer, in General Authority for Roads , Bridges and Land Transportation (GRBLT), Egypt

Abstract

Currently, in the last decade, a great number of new highways were constructed in Egypt to encourage and facilitate the investment projects. So, a lack of the abundance of quality and quantity of good virgin aggregate is becoming a great problem facing highway construction firms. So, new alternative materials should be discovered to overcome this great problem. The purpose of this study is to make a comparison between utilizing two kinds of reclaimed asphalt pavement materials in hot mix asphalt. To implement this objective, a comprehensive experimental plan was designed. Qualification tests were performed on the study materials. Two kinds of study materials were used in this study; calcareous reclaimed asphalt pavement (RAP) and dolomite reclaimed asphalt pavement. Different percentages of virgin aggregates were used with complementary percentages of RAP in each asphalt mix. Marshal tests were performed to determine Marshal properties and optimum asphalt content in each asphalt mix. Indirect tensile strength test and loss of stability test were conducted on each prepared asphalt mix. After the analysis of study results, it is found that increasing the percentage of reclaimed asphalt pavement will decrease the characteristics of asphalt mixture, at a specific percentage of asphalt content. Also, the ideal percentage of RAP to be utilized in flexible pavement is 25% of calcareous RAP and 30% of dolomite RAP.

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