APPLICATION OF SPECIAL SPECIFICATIONS FOR ROCK MATERIAL AS ROAD EMBANKMENT IN THE PROBOLINGGO–BANYUWANGI TOLL ROAD PROJECT PACKAGE 3 STA 20+200 – STA 45+800: A SPECIAL SPECIFICATION ANALYSIS

Abstract

The Probolinggo–Banyuwangi Toll Road Project, Package 3 STA 20+200 – STA 45+800, is the first pilot project in Indonesia to use excavated rock as embankment material. This approach optimizes rock excavation volume, reduces external borrow needs, and lowers disposal costs. The study explains rock embankment works carried out in the field according to the Special Specifications, outlines the water replacement method for field density measurement, and evaluates rock material feasibility to ensure roadbed stability. Research methods include literature and specification review, technical interviews, and analysis of laboratory and field data. Tests conducted were Uniaxial Compressive Strength (UCS), Proctor compaction, proof rolling, and density measurement with the water replacement method. Results show the works complied with the Special Specifications, covering material testing, excavation, hauling, spreading in ≤60 cm layers, compaction, geotextile installation, and covering with Common Borrow Material (CBM). The water replacement method proved effective for coarse materials with results meeting requirements. The rock material used in the field has UCS ≥ 12.5 MPa, meeting the hard rock excavation criteria specified in the Special Specifications, confirming its suitability as an alternative embankment material for similar projects.