Characterization And Mechanical Testing Of Elastomer Modified Bitumen

Nadzri, Zaty Zhafarina (2019) Characterization And Mechanical Testing Of Elastomer Modified Bitumen. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This project aimed to characterize and study the mechanical properties of a type of viscoelastic materials, i.e. elastomer modified bitumen for damping sheet application. Elastomer modified bitumen is commonly used as the base to manufacture damping sheet due to its damping ability owing to its superior viscoelastic behavior. Most of the manufacturers use synthetic rubbers to be incorporated into bitumen binder. However, the world faces great atmosphere pollution partly due to non-biodegradable materials such as used tires. Hence, there is a need to recycle materials instead. The motivation of this work was motivated to incorporate waste tire dust into bitumen to evaluate its potential as damping sheet. This work studied the effect of mixing temperature and tire dust filler loading on the physical properties and mechanical properties of the elastomer modified bitumen. Tire dust in the form of micro-sized particles were mixed with bitumen at varying filler loading (0-25 wt.%) and mixing temperatures (140-180 °C). The mixture was then pressed into sheet form using hot compression machine. A minimum of five samples were cut from the sheets and later subjected to determination of density, glass transition temperature and damping properties. It was observed that increase of tire dust increased density due to greater density of tire dust than that of bitumen. As for the effect of mixing temperature, there was no change in the glass transition temperature of the bituminous mixture when mixing temperature was fixed at 140 °C; however, increase of mixing temperature caused glass transition temperature to drop with increase of tire dust loading. It was due to probable chemical reaction occurring between bitumen and tire dust at higher mixing temperatures. Meanwhile, all compositions exhibited substantial damping properties. Damping effect improved with increase of tire dust loading for bituminous mixture mixed at 140 °C. The damping result was inconsistent for bituminous mixture mixed at higher temperatures which requires further studies for clarification.

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