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Influence of Ageing Periods on Strength Properties of Rubber Modified Asphalt Concrete

Saad Issa Sarsam


Crumb rubber is usually implemented to enhance the flexibility, strength, and durability of asphalt concrete. An attempt has been made in this assessment to implement (8 and 16) % of crumb rubber powder into three types of asphalt binders obtained from (Nasiriyah, Erbil, and Dourah) oil refineries. Asphalt concrete wearing course specimens have been prepared using Marshall procedure and tested for Marshall stability and indirect tensile strength. Test results were analysed and compared. It was noted that implementation of 8 % of crumb rubber exhibit superior quality of asphalt concrete from Marshall stability and indirect tensile strength points of view regardless of the ageing period or asphalt binder origin. It can be observed that mixture of Dourah binder exhibit the highest Marshall stability of (11.6 and 18.0) kN, highest tensile strength of (1509 and 2159) kPa and highest Marshall stiffness of (3693.8 and 10500) N/mm before and after ageing process respectively. However, the modified Dourah binder mixtures with 8 % crumb rubber exhibits the highest Marshall stability of (15 and 23.5) kN, highest tensile strength of (1967 and 2789) kPa and highest Marshall stiffness of (6168.6 and 23000) N/mm before and after ageing process respectively as compared with mixtures from other binders’ origin. Binder  obtained from Erbil refinery exhibit the highest flow value of 3.33 mm as compared with (3.08 and 3.13) mm flow for Nasiriyah and Dourah oil refineries binder respectively.

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