Effect of Aggregate Gradation on Reducing Reflection Crack

الملخص

e rehabilitation of cracked flexible pavement roads by overlaying, without any improvement, is rarely a durable solution, as the cracks rapidly propagate through the new asphalt layer. Crack's reflection through a road structure is one of the main causes of premature pavement deterioration which shortens the service life of overlays. The prime objective of the present study is to find the suitable remedies to reduce reflection cracks, by optimizing overlay asphalt mix design after considering the properties of various available material types, amounts, and applied conditions. This will include one type of grade and five contents of asphalt cement, Two types of aggregate gradation, and one type with different A total of 72 Marshall Specimens is prepared and tested by Marshall Method to estimate optimum binder content under traffic loading of the rolling tire. 42 Compacted asphalt concrete prism samples are prepared and tested using the wheel track apparatus. It can conclude that the use of surface agg. gradation type II gives the highest resistance to reflection cracking as compared with Gradation I.