Laboratory Investigation on Use of Fly Ash Plastic Waste Composite in Bituminous Concrete Mixtures

AbstractThis paper reports the benefits of composite of fly ash and plastic waste in Bituminous Concrete (BC) mixture for construction of flexible pavement. Fly Ash (FA) and Plastic Waste (PW) are two abundantly available waste materials, with several good characteristics, making them suitable for bituminous road construction. The plastic waste will improve some properties of the bituminous mix and also solve environmental problems. Fly ash is the finely divided residue that results from the combustion of pulverized coal. It can be used as cost-effective mineral filler in hot mix asphalt (HMA) paving applications. The Thermal degradation behavior of the plastic waste was investigated by Thermo Gravimetric Analysis (TGA). Samples were prepared using various percentages of plastic content from 0.25% to 1% with 0.25% increment by weight of the total mix. From the tests it was found that the optimum content of plastic is 0.75% and the optimum binder content of bitumen for fly ash as filler is 5.3% and fly ash-plastic waste composite is 5.4%. Samples were prepared using 0.75% plastic content and optimum binder content of bitumen by weight of total mix. The designed BC mixes such as mixture containing fly ash as well as fly ash- plastic waste composite were prepared in a laboratory mixer and are designated as BC A and BC B respectively. The BC mixtures were subjected to performance tests such as indirect tensile strength, indirect tensile strength ratio, static creep and resilient modulus at different temperatures and rutting resistance by wheel tracking test. From the indirect tensile strength ratio (TSR) it is found that, the TSR of BC B was 10.3% higher than the BC A mix indicating better resistance to moisture damage. From the static creep test it is found that the permanent deformation of BC B is higher than the BC A at both the temperatures 35°C and 45°C but percentage of recovery is higher for BC B than the BC A mix. Resilient modulus values of BC B was higher than the BC A at both the temperatures 35°C and 45°C.Higher values of resilient modulus values indicate that they are very high and support to reduce rutting behavior of mixtures. Rut depth of BC B is 15.9% lower than the BC A. These findings indicate that BC containing composite as substitute of traditional filler is an acceptable material for bituminous road construction

Laboratory performance of stone matrix asphalt containing composite of fly ash and plastic waste

186-192In this paper, the optimum composition of fly ash and plastic waste in a composite has been established based on various performance tests. The optimum dose of plastic waste in composite is 8% weight of fly ash. Laboratory tests indicated increased resistance to moisture damage in stone Matrix Asphalt (SMA) mixture containing composite as filler. The values of resilient modulus of the SMA mixture containing composite are fairly high compared to SMA mixture containing lime as filler. The rutting in SMA mixture containing composite is reduced to one third as compared to conventional SMA mixture without composite. The results of mechanistic analysis indicate that there is an increase in allowable number of traffic on modification of SMA with fly ash – plastic waste composite as filler in place of lime

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Trinidad Lake Asphalt (TLA) is natural bitumen. The soluble bitumen in Trinidad Lake Asphalt has a high viscosity and if this is blended with paving grade bitumen, it can produce a material with high resistance to deformation and with suitable weathering properties. In this study TLA pellets have been used as a modifier to modify VG-30 grade paving bitumen, and it was found that it improved the properties of the VG 30 grade binder. Various binder properties were checked like softening point, penetration value, viscosity indices, and properties of modified and unmodified binder after short term aging were studied, and Rheology of binders was also studied. After witnessing the improved properties of binder, bituminous (asphalt) mixes were prepared to check the performance characteristics of TLA modified asphalt mixes. Results of wheel tracking test, beam fatigue test, and tensile strength ratios indicate that a worthwhile improvement in resistance to deformation, comparable to conventional asphalt mix, can be obtained by the addition of 2% of TLA by weight of VG 30 grade bitumen