KARAKTERISTIK MARSHALL ASPHALT CONCRETE WEARING COURSE (AC-WC) DENGAN MENGGUNAKAN CAMPURAN LATEKS

Abstract

Using the Marshall test method, this study examines the effect of adding latex to the porous asphalt concrete mixture of type AC-WC. Based on the results of laboratory tests, there were changes in the characteristics of the asphalt concrete mixture after the addition of latex. The density of the standard mixture was recorded at 2.221 gr/cm³, while the mixture given latex increased to 2.238 gr/cm³. This increase indicates that latex can contribute to the mixture's density, which can potentially increase the pavement structure's resistance. The VMA value in the standard mixture was 17.30%, while it decreased to 16.72% in the latex mixture. This decrease in VMA indicates that latex can fill the pore space between aggregate grains, thereby reducing the volume of voids in the mixture and having implications for increasing the mixture's resistance to water penetration and oxidation. VIM value slightly increased from 4.92% in the standard mixture to 4.95% in the latex mixture, indicating a small change in the total void volume. The percentage of  VFA in a standard mixture was recorded at 71.56%, while it decreased to 70.43% in the latex mixture. This decrease in the VFA value indicates that although latex fills some of the pore space, asphalt penetration in the aggregate cavity is slightly reduced, which needs to be considered in setting the composition of the mixture so that the quality of the asphalt bond remains optimal. Regarding mechanical stability, the standard mixture has a stability value of 976.20 kg, while the latex mixture slightly decreased to 963.20 kg. This decrease is still within acceptable limits and indicates that the addition of latex does not significantly reduce the maximum strength of the mixture. The flow value in the standard mixture is 3.87 mm and decreases to 3.70 mm in the latex mixture, indicating an increase in the stiffness and deformation resistance of the mixture due to latex. Finally, the Marshall Quotient (MQ) value, which compares stability and flow and describes the stiffness of the mixture, increased from 252.48 kg/mm ​​in the standard mixture to 260.40 kg/mm ​​in the latex mixture. This increase in MQ indicates that the mixture with latex can better withstand permanent deformation under traffic loads. Overall, the study's results indicate that the addition of latex to the AC-WC asphalt mixture positively affects several physical and mechanical parameters of the mixture, especially in increasing density, stiffness, and deformation resistance. However, a slight change in the void value needs to be optimized to maintain a balance between the strength and flexibility of the pavement. These findings strengthen the potential use of latex as a modification material in developing more durable, high-performance road pavements..