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Three percentages of rice husks were used as modifiers.The influence of rice husks on the conventional properties, complex modulus, cracking parameters and rutting parameters were investigated.Therefore penetration and rheological tests using a dynamic shear rheometer were carried out to characterize the rice husksmodified bitumen.Based on the results obtained from the conventional properties tests and rheological tests, rice husks reduces the temperature susceptibility and increases the viscosity, stiffness and elastic behavior of the rice husksmodified bitumen.Rice husks enhanced rutting resistance and fatigue resistance of the bitumen at high temperatures and low temperatures.The best results were recorded for rice husksmodified bitumen containing of rice husks.Most of the asphalt aging occurs during the road construction as the asphalts heated up to C. Few steps of preparation were carried out to produce the final fine powder to be blended with asphalt binder.The biomass dried in the drying oven at temperature of C for days to get rid of any moisture content in it.Furthermore, biomass has grinded by using grinding <a href="http://www.targetmol.com/compound/8-Hydroxyquinoline">Targetmol's Hydroxyquinoline</a> machine until it gets to powder form.Finally, the powdered biomass sieved using micron sieve machine.Only the fine particles that passed the micron sieve has been collected to be used in this study as modifier.All the modified bitumen was prepared using a high shear mixer at C under rpm of speed for one hour.The higher values of penetration indicate the softer bitumen and higher temperature susceptibility and vice versa.The bitumen sample was melted and poured to cups then preconditioned by cooling it to C.Standard needle was applied to the sample in the penetration cup at a temperature of   C and penetration value was measured by using penetrometer. In the softening point test, two horizontal samples of bitumen, placed in shouldered brass rings, are heated at a controlled rate in a water bath while a steel ball was placed on the center top of each sample.The softening point value is the mean temperatures at which the two disks soften sufficiently to allow each ball, enveloped in bitumen, to fall mm. Higher penetration index values refer to lower temperature susceptibility of bitumen and vice versa.Penetration value from penetrometer at C was used to measure the temperature susceptibility of the binders.It was used to determine the asphalt binders rheological properties.One plate was used in DSR, namely an mm diameter spindle with a gap of mm.The rheometer apparatus were preheated to the test temperature to get the temperature stabilized the bitumen sample poured on the top of the bottom plate. The trimming will be conducted after the top and bottom plate get close to each other by a more than the designed gap.The test will be stated after trimming and the plate reaches the target gap.The smallest possible stain control chosen to ensure that the tests done in the linear area and it must be large enough to obtain sufficient torque readings at low frequencies and high temperatures and sufficient strain at high frequencies and low temperatures.Dynamic viscoelastic properties analysis, using a dynamic type test, has been used as a fundamental rheological testing method for bitumen.

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