EVALUATION OF ROLLER COMPACTED CONCRETE (RCC) MIX DESIGN AND COMPACTION METHODS IN INDONESIA: A COMPARISON OF LABORATORY AND ON-SITE TRIALS

• Main Author: Ratu Inris, Regina
• Format: Theses
• Language: Indonesia
• Subjects: Teknik sipil
• Online Access: https://digilib.itb.ac.id/gdl/view/84328
• Institution: Institut Teknologi Bandung

Roller Compacted Concrete (RCC) is an alternative method for dam construction that aims to reduce construction time and costs. Despite its advantages, RCC dams have yet to be constructed in Indonesia. Although numerous guidebooks provide information on materials and mix designs, a significant challenge remains in utilizing the materials accessible in the vicinity of the dam. The objective of this research is to determine the optimal mix design and construction method by conducting laboratory and on-site trials, while comparing the results across trials. Laboratory trials were conducted using a pan mixer for mixing and a vibrating hammer for compaction, while the mock-up trial site used a twin-shaft mixer and a vibratory roller. This study investigated various amounts of cementitious material, fractions of gravel/sand, and the optimum water content. Both trials revealed 50/50 gravel/sand ratio and 4% moisture content are optimal. Laboratory trials using LCRCC with 110 kg/m³ cementitious material yielded a compressive strength of 15 MPa at 150 days, while MCRCC with 150 kg/m³ and 175 kg/m³ reached 15.41 MPa and 20.86 MPa at 28 days. On-site, eight passes with a vibratory roller achieved 98.3% and 99.2% density and 80.2% and 86.4% compressive strength for 150 kg/m³ and 175 kg/m³ cementitious, respectively. However, the large-scale mixing demonstrated lower effectiveness, resulting in a compressive strength reduction of 46.4% and 54.1% for RCC with 150 kg/m3 and 175 kg/m3 cementitious, respectively. These discrepancies highlight the necessity of incorporating a safety factor in laboratory mix designs and reassessing guidebook recommendations for practical applications.