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ISSN 2063-5346
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EXPERIMENTAL INVESTIGATION ON EFFECT OF CRUMB RUBBER IN BITUMINOUS MIXTURES FOR CONSTRUCTION OF FLEXIBLE PAVEMENTS.

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Behzaad Bilal1, Waseem Akram2
» doi: 10.48047/Ecb/2023.12.Si5a.0334

Abstract

This study examines the impact of adding waste tires in the form of crumbs as an additive in a bituminous mix. In order to understand the behavior of the bituminous mixtures due to incorporation of crumb rubber (CR) and effect on the properties of bitumen binder, different experimental investigations were carried out on virgin bitumen followed by that on the crumb rubber modified bitumen (CRMB). For the comparative analysis, four different percentages of crumb rubber (5%, 8%, 10%, and 12%) by the weight of bitumen were used. The experiments conducted revealed that with the increase in CR percentage (0% to 12%) in the bituminous mix, the penetration and ductility of CRMB decreased. Similarly the softening point and flash and fire point increased with increase in CR percentage within the mix. The findings of the penetration test and softening point test were used for calculating the CR modified bitumen mixture's temperature susceptibility as a measurement of their penetration index (PI). Also the comparisons with existing studies were carried out and inferences were drawn. From this study it is concluded that using CRMB has far more benefits over the conventional bitumen and enhance the overall strength and efficiency of the asphalt mixture used for construction of pavements. Utilizing this recovered CR also offers a secure method of getting rid of such nonbiodegradable pollutants.

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