INVESTIGATION OF AGGREGATE PARTICLES SHAPE ON CHARACTERISTICS OF HOT MIX ASPHALT | ||||
| JES. Journal of Engineering Sciences | ||||
| Article 2, Volume 42, No 6, November and December 2014, Page 1349-1366 PDF (608.39 K) | ||||
| Document Type: Research Paper | ||||
| DOI: 10.21608/jesaun.2014.115110 | ||||
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| Authors | ||||
| Hassan Youness Ahmed1; Mostafa Deep Hashem2; Naglaa Kamal Rashwan3; Samir Azmy Abdalla4 | ||||
| 1Faculty of Engineering, Assiut University, Civil Engineering Department, EGYPT | ||||
| 2Faculty of Engineering, Minia University, Civil Engineering Department, EGYPT | ||||
| 3Civil Eng. Dept., Industrial Education College, Beni-Suef, EGYPT | ||||
| 4Civil Engineering Dept., Higher Institute of Engineering and Technology, El-Minia, Egypt. | ||||
| Abstract | ||||
| This research represents a laboratory study of the effect of the aggregate shape in HMA. The shape of aggregates particles is not the only factor of aggregate characteristics which effect on HMA. Other Parameters such as aggregate gradation and aggregate surface texture are also effect. The aggregate shapes considered for the study were cubical, disk and blade shapes. Two aggregate surface textures used in the mix which were smooth and rough particles. The aggregate gradations used in the mixtures were maximum, medium and minimum gradation .Shape of aggregate was determined through two methods. The first method was an image measurement of coarse aggregate while the second method was particle shape index. Marshal tests and indirect tensile test were performed to investigate the different in behaviors of different samples with different parameters considered in this study taking into account that the control mix contains crushed gravel, rough aggregate particles with disk shape, medium gradation of aggregate and 4% of limestone powder as mineral filler. The results showed that using of cubical aggregate shape increased each of Marshall Stability, bulk density, Marshall Stiffness, Marshall Quotient, Stiffness Modulus and the Indirect Tensile Strength of the mix than disk and blade shapes while decreased each of flow and air voids. The results also, showed that medium gradation of aggregate had good results than other gradations. By using rough particles the values of ITS and stiffness modulus were higher than using smooth particles | ||||
| Keywords | ||||
| HMA; Aggregate; Aggregate shape; Gradation and Mineral filler | ||||
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