Study on Behavior of Modified Asphalt Mixes Containing Waste Polyvinyl Chloride at High Temperature and Heavy Traffic Condition (Super-Pave Performance Based Test Method)
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Date
2020-06
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Addis Ababa University
Abstract
At some route corridors, especially at import and export corridors, there exists a considerable movement of heavy trucks, higher tire pressures and high temperature which instigates a significant increase of dynamic loads and failures on the bituminous road pavements. Due to this, currently, high budgets are allocated for the construction of rigid pavements at some corridors which intern is affecting the financial dealings of the government since there are also other alternatives for enhancing the performance of flexible pavement with reduced cost. One alternative to improve the performance of asphalt pavements in hot climates and under heavy traffic is to use bitumen modifiers to enhance its rheological property. Hence, in this research waste thermoplastic polymer (waste polyvinyl Chloride (PVC)) modifiers were used with varied content and percentage by weight of the bitumen (i.e. 8%, 10%, 12 & 14% by weight of the bitumen) and the performance of the modified bitumen and the asphalt mix were evaluated through experimental studies based on Super-pave test method (specific tests selected for targeted performance indicater tests). As a result, unlike the pure bitumen which has a temperature resistance of up to 64oc and accommodating a maximum traffic level up to 10 Million ESAL, at the same temperature, it was able to increase the resisteance of the traffic level up to three times (i.e. 30 Million) by adding 14% PVC to the bitumen. Furthermore, with the same composition the modified bitumen was able to resist a standard traffic level up to 10million ESAL at increased temperature level up to 70oc. Additionally, based on performance tests, by adding 14% waste PVC, the permanent deformation (rut depth) at the end of the design life of the asphalt mix was able to reduce by 35% relative to the pure/non – modified mix and the modified mix was able to have a better resistance to moisture-induced damages and lesser reduction in strength after it was conditioned in water.
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Asphalt Mixes, Waste Polyvinyl Chloride, Heavy Traffic Condition, Super-Pave