Green and sustainable production of waste styrofoam-modified bitumen: a laboratory-based investigation on physical, rheological properties, and storage stability (original) (raw)
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Polymer modification of bitumen to decrease bitumen pavement susceptibility to high and low temperatures, allowing reduction in common failure mechanisms as rutting and cracking has been in existence since decade. The objectives was to study the mechanical and rheological properties of properties of extracted base bitumen from Agbabu and Loda and bitumen–polymer (polyethylene) blend from the two sources and helped to understand possible conversion of the nondegradable waste into useful product. 200grams of sheared waste polyethylene sachet were mixed in ratio 10:90, 20:80, 30:70, 40:60 and 50:50 to extracted bitumen sample from both Agbabu and loda using mechanical mixer Heidolph model RZR 2020. These were heated in a thermosetting oven at 300 0 C for two hours for good modification. The results obtained indicated that Agbabu bitumen had good yield (79.90±0.01) when compared with Loda (46.50±0.01) after extraction. Other physico-mechanical properties of sheared Polyethylene Modified...
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Polymer-modified bitumen (PMB) is bitumen that has been specifically engineered with polymer for providing enhanced performance in service. The aging of bitumen is a main aspect that is able to affect its final performance: during the production phase in a hot mix plant, all the binders experience short-term aging due to the high processing temperature. The same is true during the production of the modified binder, when the polymer is dispersed at high temperature in the bitumen mass. This paper aims at studying the effect of short-term aging when using different types of modifiers such as recycled polymers obtained from waste materials. A 50/70 penetration-grade bitumen has been modified, and bitumen characterization has been carried out before and after short-term aging; conventional tests, viscosity measurements, and dynamical mechanical analysis have been used to investigate the properties. Different aging indices have been determined for predicting the effect of short-term agin...
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Bonfring
In India, the methods for rheological characterization of bituminous binders are inadequate to characterize the bitumen. Hence a complete rheological study and characterization of bitumen using dynamic shear rheometer would be helpful. Also there is limited insight about the chemistry of modified bitumen. Modification of asphalt binders can serve several purposes. It can increase the overall performance of a binder by widening the range between the binder?s high and low-temperature grades. In this paper VG30 bitumen and two polymers: Styrene Butadiene Styrene (SBS) block copolymer and Ethylene Vinyl Acetate (EVA) polymers were used as modifiers. SBS copolymers derive their strength and elasticity from physical and cross linking of molecules into three dimensional networks. Increasing the SBS content results in increased polymer swelling, which in turn produces increase in asphaltenes and reduction in maltene content resulting in harder and viscous matrix whereas EVA modifies bitumen by forming tough, three dimensional, rigid network to resist deformation. The change in physical properties such as penetration, softening point, penetration index and mass loss were studied and compared before and after modification. Rheological parameters such as complex modulus and phase angle before and after modification were studied by using Dynamic Shear Rheometer. The results indicate that polymer modification leads to decrease in penetration value, and increase in softening point and rutting parameter (G*/Sinδ). Modifiers used for bitumen modification are normally polymeric materials which have different structures such as atactic, isotactic and syndiotactic. These structures give characteristic features in spectroscopy analysis. Thus, Infra Red Spectroscopy techniques was employed in identifying the structure and functional groups present in polymeric materials.