ملخص الدراسة:

Hot Mix Asphalt (HMA) is the most common pavement type in Gaza, Palestine and the quality control of constructed roads with HMA has always been paid great attention by researchers. This study aimed to find the effect of initial temperature of HMA (binder coat) at compaction on asphalt mechanical properties. Practical approach was used as the main procedure to achieve study goals. Laboratory tests were conducted using Marshall test method to determine the Optimum Bitumen Content (OBC), in which asphalt mixes are compacted at different temperatures starting from [80° C, 100° C, 120° C, 140° C, and 160 ° C]. The research indicated that one of the important parameters that has a critical role in changing the mechanical properties of HMA was "compaction temperature". The initial compaction temperature had a positive effect on asphalt density within the golden range 140ºC-160ºC. Moreover, increased temperature made an increase in the stability of asphalt, voids filled with asphalt, plastic flow of asphalt, and asphalt stiffness. As well as it was notable that air voids inherent in the asphalt mix were decreased with the temperature increase through the golden range. This study recommended that site engineers should check the initial compaction temperature for asphalt (quality assurance). Density vs temperature relationship could be used in investigating pavement defects and resolving disputes. This study results could help in establishing local specifications for asphalt pavement. The conclusion of the research offered recommendations for expanding the scope of compaction temperature effect on Asphalt mechanical properties by studying the asphalt wearing coat and by using different bitumen content. The study also offered a recommendation to conduct a similar research using Super Pave Method rather than Marshall method for testing.

توثيق المرجعي (APA)