LABORATORY PERFORMANCE ANALYSIS OF STONE MASTIC ASPHALT MIXTURE WITH PURE ASBUTON COMPACTED USING SUPERPAVE GYRATORY COMPACTOR

• Main Author: Khumara Tungga Dewi, Chandrika
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik sipil
• Online Access: https://digilib.itb.ac.id/gdl/view/82610
• Institution: Institut Teknologi Bandung

This research aims to evaluate the laboratory performance of Stone Mastic Asphalt (SMA) mixtures with pure asbuton using the Superpave Gyratory Compactor (SGC) and determine the SGC's capability to achieve performance in accordance with AASHTO M 325-08 specifications for SMA mixtures with pure asbuton. The mixtures used include coarse SMA with pure asbuton, both without and with 0.3% cellulose addition, and coarse SMA with Pen 60/70 asphalt with 0.3% cellulose addition, to compare laboratory performance between mixtures with pure asbuton and Pen 60/70 asphalt. In this research, compaction using the SGC was conducted for 100 gyrations, aligned with specifications for medium to heavy traffic loads, following AASHTO M 325-08 which adopts the Superpave system for SMA mixtures. Other parameters adhered to standard criteria defined by AASHTO T 312, including a consolidation pressure of 600 ± 18 kPa, gyration angle of 1.16° ± 0.02°, and gyration speed of 30 rpm. Optimum Asphalt Content (OAC) determination was based on the volumetric characteristics of the mixture. Draindown and Indirect Tensile Strength (ITS) tests were performed to evaluate mixture characteristics at the OAC. Results indicate that pure asbuton compacted with the SGC met desired volumetric characteristics. Addition of 0.3% cellulose to pure asbuton successfully reduced draindown from 6.51% to 0.09%, increased density, and decreased VIM and VMA values. The OAC was also reduced from 7.05% to 6.66%. Although SMA mixtures with pure asbuton and 0.3% cellulose lowered the OAC, part of the asphalt binder was replaced by cellulose, which filled voids and increased mixture density. This mixture exhibited a Tensile Strength Ratio (TSR) of 88%, higher than Pen 60/70 asphalt mixture with 0.3% cellulose (at OAC 6.2%). Both variations of mixtures compacted with the SGC met AASHTO M 325-08 specifications. However, managing asphalt content and adding stabilizers are crucial to address draindown issues.