LABORATORY STUDY THE EFFECT OF FIBER COMPOSITION ON PHYSICAL AND MECHANICAL PROPERTIES SHOTCRETE

• Main Author: (NIM : 12113090), KRISTIANUS
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/28519
• Institution: Institut Teknologi Bandung

Reinforcement is required to prevent surrounding tunnel rock mass from collapsing when excavation of the tunnel carried out. One of the reinforcements in tunnel excavation is using shotcrete. Cements, sands, and water is commonly used in producing shotcrete, then accelerator is added to increase its early strength. Nowadays fiber is added in the composition of shotcrete to increase shotcrete flexibility. To determine the optimum amount of fiber used in shotcrete, research in laboratory is conducted. Physical and mechanical properties are tested and consequently the compresive strength and modulus of rupture of the shotcrete are obtained. The results are also used to determine the optimum composition of shotcrete based on variation of fiber. 15 samples are produced and prepared with 5 different variation for each test. The variation of fiber in cylindrical samples are 0, 0,404; 1,778; 1,139 and 4,501 grams while the beam samples variation are 0, 0,770; 3,27; 5,81 and 8,33 grams. <br /> <br /> <br /> The results of data analysis of each variation are 8,25, 13,17; 12,29; 12,01 MPa for uniaxial compresive strength and 3,23, 3,26; 3,38; 2,41; 2,14 MPa for modulus of rupture. The optimum fiber composition yields alteration to the failure of test samples, which the failure isn’t instantaneously but still endured by the fiber when maximum loading is achieved. The second variation with 0.404 gram of fiber in cylindrical samples and 0.77 gram of fiber in beam samples are concluded the optimum composition for shotcrete sample.