Performance of Road Pavement Using AC-WC Mixture with Glycerin Oleochemical Waste Substitution Material Based on Marshall Testing and IRI Value

• Published in: IOP conference series. Earth and environmental science 2024-12, Vol.1416 (1), p.012046
• Main Authors: Wardana, Edward, Sihombing, Atmy Verani Rouly
• Format: Article
• Language: English
• Subjects: Aggregate gradation; Aggregates; Asphalt; Asphalt mixes; Ductility; Ductility tests; Field tests; Hazardous materials; Hazardous wastes; Household wastes; Imports; Kinematics; Materials substitution; Rheological properties; Rheology; Softening points; Toxic wastes
• ISSN: 1755-1307; 1755-1315
• DOI: 10.1088/1755-1315/1416/1/012046

By the end of 2021, PT Pertamina was the sole oil asphalt producer in Indonesia, with a production capacity of 350,000 tons per year. However, domestic asphalt demand exceeds this supply, leading to 75% of asphalt still being imported. To reduce imports, Glycerin Pitch (GP), a waste product from the oleochemical industry and classified as a Toxic and Hazardous Substance (B3), can be used as a substitute for asphalt. Indonesia produces 650,000 tons of glycerol annually, with 3% resulting in GP. Tests on GP with inorganic content 10% were conducted. Rheology tests showed penetration values of 62.83 and 60.4 (0.1 mm), softening points of 60.5°C and 56.5°C, kinematic viscosities of 1197 cSt and 903 cSt, ductility >100 cm for both, and specific gravities of 1.074 g/cc and 1.054 g/cc. Aggregate tests revealed an abrasion value of 16.71%, flat and elongated particles at 7.52% (split) and 8.49% (screen), and material passing sieve No. 200 at 0.87% (coarse) and 9.49% (fine). The asphalt mixture design showed an aggregate gradation of 12% split, 44% screen, 41% stone dust, and 3% filler. The optimum GP content was 27% for GP1 and 14.2% for GP2, with an optimum asphalt content of 6%. Mixing and compaction temperatures were 130°C and 150°C for ACWC+GP1 and 150°C for ACWC+GP2. The Marshall Quotient was 211 Kg/mm for ACWC+GP1 and 316 Kg/mm for ACWC+GP2. Field tests on two segments (Pen 60/70 + GP1 and GP2) showed an International Roughness Index (IRI) of 3.21 and 2.89, respectively, classified as good. These findings suggest that GP is a viable substitute in asphalt mixtures, reducing import dependence while efficiently utilizing oleochemical waste.