| Popis: |
The increase in axle load, traffic volume and expensiveness of material for construction of roads leads for the researcher to find new material and afford with better quality and list cost. Engineers have been using modified binders to improve the performance of flexible pavements. The use of waste engine oil is one of the steps taken in this direction. Consuming the waste materials for road construction will not only result in significant on the enhancement of the construction material properties and save in material costs but also assist on the way to deal with the problems of discarding of such waste materials, it is for this ground that the study focus on evaluation of waste engine oil as modifier for asphalt binder as pavement material. There were four samples extracted from 80/100 penetration grade bitumen. The first sample were checked for quality requirements and the three were modified with different content of waste engine oil (3,6and 9%). The properties of both unmodified and modified binder were checked for conventional and rheological properties. The dynamic shear rheometer was used for the determination of the rheological properties of bitumen in a different range of temperatures. The major tests performed by using DSR were Amplitude sweep test (AST), Frequency sweep test (FST), Performance grade (PG) determination and Multiple stress creep and recovery test (MSCR). AST and FST were performed at a temperature of 10.0 oc, 21.1 oc, 37.8 oc and 54.4 oc, and also PG and MSCR were performed at a high temperature. The test result indicates that as the content of modifier increase there is increase in mass loss, softening point and penetration values and decrease in ductility, flash point and fire point. From amplitude sweep test the minimum strain was 0.286% and frequency sweep test indicate that at low frequency (high temperature) provision of WEO cause the modified binder to be less stiff and vise verse. Further PG analysis indicate that both aged and un-aged 3% and 6% modified binder have similar higher PG grade with the unmodified one and 9% modified have lower PG vale. Jnr3.2 value of modified asphalt binder is lower than unmodified binder indicating that modification had improved the rutting resistance and design traffic load (ESALS). The study shows that it is possible to use waste engine oil modified binder as pavement material. |
