Characterization of Recycled Asphalt Pavement (RAP) for Use in Flexible Pavement | Science Publications

American Journal of Engineering and Applied Sciences

Abdulla Ibrahim Elmohr¹  Ahmed Ebrahim Abu El-Maaty¹ 

关键词: Recycled Asphalt Pavement;    Mechanical Properties;    Durability Performance;    Tensile Strength;    Material Test Systems;   

DOI  :  10.3844/ajeassp.2015.233.248

学科分类：工程和技术（综合）

来源: Science Publications

【 摘 要 】

Dueto economical reasons and the need for environmental conservatism, there hasbeen an increasing shift towards the use of Recycled Asphalt Pavement (RAP) materialsin the pavement construction industry. The majority of HMA mixtures in Egyptare produced only from virgin materials although there are about 4 million tonsper year of reclaimed asphalt materials, due to continuous pavement milling orscraping processes, are not used. High durability potential usually impliesthat the mechanical behavior of the mixture will endure for a long servicelife. Now, flexible pavement, made of Hot-Mix Asphalt (HMA) with the additionof the reclaimed asphalt pavement granules in the central asphalt mixing plant,is increasingly used. The main objective of this paper is to investigate theuse of a homogeneity reclaimed asphalt pavement in the pavement industryevaluating the effects of partial and total replacements of aggregates by RAPon the mechanical and durability performanceof dense-graded HMA mixtures. The performance of RAP mixtures was evaluatedthrough a series of laboratory tests including Marshall test, indirect tensilestrength test, granule adhesion test and material test systems. A series ofbinder mixes containing varying percentages of RAP were designed and subjectedto different moisture conditioning periods (1, 3 and 7 days) to investigate themoisture damage effect on RAP mixtures. The laboratory results indicated thatwhen properly designed, the asphalt mixes with RAP especially at 50 to 100%replacement ratio provided better performance compared to those of newconventional HMA mixtures where they minimized the environmental impactsthrough the reduction of energy consumption, improved the mechanicalproperties, durability performance and also stripping resistance.

【 授权许可】

Unknown