Bond Strength Between Concrete Substrate and Reinforced Polyester Composites
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JMEPEG https://doi.org/10.1007/s11665-020-05295-7
Bond Strength Between Concrete Substrate and Reinforced Polyester Composites Ibrahim Alameri
and Meral Oltulu
Submitted: 28 May 2020 / Revised: 7 October 2020 / Accepted: 13 October 2020 The bond strength of polymer composite to the concrete surface is a critical aspect of bridge and parking structures. In this study, the bond strength between concrete and polyester composites reinforced by silicabased materials of different sizes was investigated. Waste marble dust/silica fume particles were applied alone or combined with nano-silica into polymer composite to enhance the bond strength. Slant shear and splitting tensile test results showed that the bond strength of reinforced polyesters is higher in comparison with the neat polyester composites. The combination of waste marble dust with nano-silica and single nanosilica achieved the highest bond strength. In addition, it was observed that the addition of nano-silica and marble dust to the polymer composites showed a high load corresponding to low deformation in comparison with the other groups. Keywords
bond strength, FTIR, Mohr–Coulomb theory, polymer composites, SEM, slant shear test, splitting tensile strength
1. Introduction As concrete remains the most widely used construction material, the repair needs of existing concrete structures continue to increase. Many studies were made to strengthen old and damaged concrete. One of the strengthening methods of damaged concrete is by adding new concrete or stronger material over the old layer, such as ultra-high-performance fiber concrete (Ref 1, 2), metakaolin-based geopolymer (Ref 3), recycled aggregate concrete (Ref 4), self-compacting concrete containing latex and polypropylene fibers (Ref 5), concrete containing natural fibers (Ref 6), epoxy layer (Ref 7), concrete containing metakaolin (Ref 8), and concrete containing silica fume with metakaolin (Ref 9). The critical issue in applying a repair material to an existing concrete substrate is the bond developed between repair material and the original materials (Ref 10). The repair system can be considered as a three-phase composite system: substrate, overlay, and bond zone. The bond zone herein refers to the interface and perimeter of the bond plane. The bond area must be able to withstand the stresses imposed on the system. The bond strength between substrate and overlay can be improved by adding additives to the overlay, such as metakaolin-based geopolymer (Ref 3, 8), recycled aggregate (Ref 4), latex and polypropylene fiber (Ref 5), and silica fume with metakaolin (Ref 9). Nowadays, polymer composites are widely used in construction and repair work due to their high compressive strength, improved durability properties, high ductility, resistance to aggressive chemicals, and superior adhesion to steel Ibrahim Alameri and Meral Oltulu, Department of Civil Engineering, Faculty of Engineering, Ataturk University, Erzurum, Turkey. Contact e-mail: [email protected].
Journal of Materials Engineering and Performa
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