Durability of Hot Asphalt Mixtures Containing Reclaimed Asphalt PavementsReport as inadecuate




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The durability potential of bituminous mixtures may be defined as theresistance of the mixture to the continuous and combined damaging effects ofwater. High durability potential usually implies that the mechanical behaviorof the mixture will endure for a long service life. Now, flexible pavement,made of hot-mix asphalt HMA with the addition of the reclaimed asphaltpavement granules in the central asphalt mixing plant, is increasingly used.The amount of the added reclaimed asphalt pavement RAP depends on mineralmaterials and their homogeneity. This paper presents the physical properties ofRAP and their influence on the durability performance of a binder asphaltpavement mix. A series of binder mixes containing varying percentages of RAPwere designed and subjected to different moisture conditioning periods 1, 3and 7 days to investigate the moisture damage effect on RAP mixtures. A mixmade from only virgin material was selected as the control mix. The effect ofRAP on the durability of binder course mix was evaluated through a series oflaboratory tests including Marshall test, indirect tensile strength test andthe water sensitivity tests where many moisture damage indicators were obtainedsuch as retained Marshall stability, Marshall quotient, durability index,tensile strength ratio, resilient modulus ratio and energy loss ratio. Theresults indicated that the additional of RAP especially at 50% content wasbeneficial in improving the durability performance and reducing the moisturesusceptibility of the hot mix asphalt mixtures.

KEYWORDS

Reclaimed Asphalt Pavement, Durability, Moisture Damage, Tensile Strength Ratio, Retained Marshall Stability, Energy Loss

Cite this paper

El-Hmrawey, S. , Abu El-Maaty, A. and Elmohr, A. 2015 Durability of Hot Asphalt Mixtures Containing Reclaimed Asphalt Pavements. Open Access Library Journal, 2, 1-18. doi: 10.4236-oalib.1101508.





Author: Saad El-Hmrawey1, Ahmed Ebrahim Abu El-Maaty1*, Abdulla Ibrahim Elmohr2

Source: http://www.scirp.org/



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