Project Title: Cracking Mechanism in Durable Steel Fiber Reinforced Acrylic Emulsion Polymer Modified Concrete (SFRPMC)
Research ID: 1/2016/04
Principal Researcher: Dr. Dayang Siti Hazimmah Ali
Co-Researchers: Euniza ak Jusli, Zurina Ismail
Project Start Date: 3/1/2016
Duration of Project: 24 months
Research Summary: There are many studies which reported that usage of polymer and fiber reinforcement that are suitable can produce composite polymer with better performance and reduction in production cost and raw material. There are various parameters that changed match in effort to increase fracture toughness of the composite polymer. The parameters studied were filler volume fraction, particle size, filler strength, bonding between filler and resin and resin viscosity. Differences of parameter that had been reported give improvement in various attributes studied such as mechanical and thermal strength (Miyamoto et al., 2002). Addition of steel fiber conceded can enhance the fracture toughness of the composites. Steel fibers and synthetic fibers (such as polypropylene, polyethylene, PVA and carbon fibers) are now the most common fiber types. Their performance depends on their elastic modulus, aspect ratio, surface texture, and also on the matrix type and the bonding properties between the fibers and matrix. In recent years, researchers have begun to transfer the benefits of fiber reinforced concrete (FRC) to structural applications, especially for seismic structures (ACI Committee 544, 1997). Nowadays, due to the high demand on light materials which have good mechanical and thermal properties, the polymer composites reinforced with fiber developed increasingly and carried out actively. Polymer composite gives better improvement in mechanical properties and good thermal compared to common composites. In this research, an investigation was done on steel fiber reinforced concrete containing acrylic emulsion polymer (AEP) as one of the mixing ingredient. Some properties such as mechanical strength, thermal properties and bonding performances through interfacial transition zone (ITZ) had been studied for this composite. Through this research, mechanical response is measured under tension and bending tests while crack formation will be investigated for durable of SFRPMC using a high resolution image capturing procedure. Crack spacing is measured using image analysis and correlated with the applied strain under both the tensile and bending response. Various stages of loading corresponding to initiation, propagation, distribution, opening, and localization of a crack system in the specimen will be studied. The effect of flexural cracking on the location of neutral axis during the bending tests is measured using strain gages.