Evaluation of Hot Asphalt Mixtures Containing Reclaimed Asphalt Pavements
Ahmed Ebrahim Abu El-Maaty1, Abdulla Ebrahim El-Moher2
1Ahmed Abu El-Maaty, Assoc. Prof., Department of Civil Engineering, Menoufia University , Shibeen Elkom City, Egypt.
2Abdulla El-Moher, M.sc, Department of Civil Engineering, Alazhar University, Nasr City, Egypt.
Manuscript received on 15 April 2015 | Revised Manuscript received on 25 April 2015 | Manuscript Published on 30 April 2015 | PP: 197-206 | Volume-4 Issue-4, April 2015 | Retrieval Number: D3955044415/15©BEIESP
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: The conventional method of providing bituminous surfacing on flexible pavements require significant amount of energy for production of bituminous mix at hot mix plant. Due to economical reasons and the need for environmental conservatism, there has been an increasing shift towards the use of reclaimed asphalt pavement (RAP) materials in the pavement construction industry. Hot mix recycling is the process in which RAP materials are combined with new materials to produce hot mix asphalt mixtures. The amount of the added reclaimed asphalt depends on mineral materials and their homogeneity. The main objective of this paper is to investigate the use of a homogeneity reclaimed asphalt pavement in the pavement industry in Egypt evaluating the effects of partial and total replacements of aggregates by RAP on the mechanical and volumetric response of dense-graded HMA mixtures. Laboratory studies were carried out on asphalt mixes with RAP material and their performance was compared with virgin asphalt mixes. Various performance tests such as indirect tensile strength, resilient modulus, absorbed energy and wheel tracking test were carried out. In addition the effect of moisture damage or stripping on strength of RAP mixtures was investigated. Moreover an economic study was achieved to determine the saving in cost of materials due to using RAP in HMA. The laboratory results indicated that when properly designed, the asphalt mixes with RAP especially at 50% to 100% replacement ratio provided better performance compared to those of new conventional HMA mixtures. While cost analysis showed at least 45-64% savings in material cost related expenses.
Keywords: Reclaimed Asphalt Pavement, Mechanical Properties, Moisture Susceptibility, Indirect Tensile Strength, Marshall Stability, Rutting.
Scope of the Article: Mechanical Maintenance