INVESTIGATION AND EVALUATION OF THE COMBINED EFFECTS OF RUBBER TIRES AS FINE AGGREGATE AND CERAMIC DUST AS FILLER MATERIAL IN ASPHALT CONCRETE MIX

Abstract

Asphalt concrete is the most often used type of pavement structure in worldwide, especially in developing countries. This sort of asphalt mix concrete requires a significant amount of crushed material. Several significant factors or challenges may affect the performance of an bituminous concrete surface. The challenge in finding easily available resources due to their scarcity and high cost is one of the most significant problems. This will affect our pavement structure in an economic and environmental aspect. Therefore, it’s need to search for optional materials that might be used in addition to or instead of creating hot mix asphalt (HMA) as a means of maintain the sustainability of construction of pavement road. This investigation was designed to assess the combination impacts of waste ceramic dust (WCD) as a filler ingredient and waste rubber tire (WRT) as fine aggregate in HMA concrete. The materials' physical attributes were examined separately in order to help the study reach its goals, and the outcomes, with the exception of waste rubber tire water absorption, met all specification requirements. The results fulfilled the requirements and the amount of water absorption requirement when the materials were tested combined with fine aggregate. As an outcome, the modified mix requires slightly less bitumen than the standard mix. The combination mix and control mix had the optimum bitumen contents, with 4.7% and 5.2%, respectively. Tests were conducted on incremental rubber tire replacement in marshal mix, with results showing good performance at 4% and 8%. In general, 8% rubber tires perform more efficiently than 4% rubber tire materials. Furthermore, all requirements have been satisfied according to the test's updated result, which shows WCD values of 3%, 5%, 7%, and 9% in mixed. Good results were obtained with combination of both of these two materials, using 8% WRT and 7% WCD replacements. The modified and control mixtures had tensile strength ratios (TSR) of 77.18% and 82.49%, respectively. As a result, it satisfied the 75% minimum the criteria and was suitable to use in the manufacture of asphalt pavement. According to cost study, replacing these materials would also save 2.387% of the project's overall cost, which has significant financial benefits. In order to manufacture HMA concrete with better outcomes, the study concludes it is advisable that the asphalt concrete mix should contain 7% WCD and 8% WRT replacement. Additionally, using these materials advantageously reduces the requirement for natural crushed aggregate and filling material.