Abstract. Fatigue cracking is a common mode of distress in asphalt pavement. The main objective of this work is to determine the impact of variation in aggregate gradations and mineral filler types, on fatigue cracking potential at different testing temperatures. Roller compacted asphalt concrete slab samples were prepared in the laboratory, beam specimens were sawed from the slabs and subjected to Repeated Flexural Beam Fatigue Testing with the following variables: two testing temperature (20 and 5) °C, three percentages of asphalt content (OAC ± 0.5), two types of aggregate gradation representing SCRB, 2003 wearing course, and Road Note 31 (1993). Two types of mineral filler, limestone dust and coal fly ash. It was concluded that Fatigue life was reduced by 73.70%, 72.78%, 76.13% and 77.49 % when the testing temperatures changed from 20 to 5° C at OAC for mixture type I, type II, type III and type IV, respectively. Aggregate gradation according to SCRB specification was more resistant to fatigue cracking than Road Note 31 gradation at different testing conditions. Fatigue life was reduced by 15.28% and 23.11% when the aggregate gradation changed from SCRB specification to Road Note 31specfication for OAC at 20 and 5 ˚C testing temperature, respectively. Coal fly ash exhibit more resistant to fatigue cracking than limestone dust when used as a mineral filler at different testing conditions. When the testing temperature was 20 ˚C and aggregate gradation was SCRB, fatigue life was increased by 13.25% when filler type was changed from limestone dust to coal fly ash at OAC.
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