Compressive Behavior Of Polyester Fiber Reinforced Plastic (PFRP) Confined Concrete

Possessing many advantages such as high strength, light weight,corrosion resistance as well as construction convenience, fiber reinforced composite plastics are widely used in civil engineering. With the development of economy and the advancement made in materials science, researchers pay more and more attention to green materials, sustainable materials and high-performance materials. The high cost and low production of traditional man-made fibers are unable to highlight their advantages in this respect, thus fiber materials with characteristics of low cost, convenient drawn, green sustainability and good reinforcing effects have become research and exploration emphases of more and more researchers.Polyester fiber is the fastest growing, the most productive and the most widely used fiber among all the synthetic fibers, and its good material properties and huge industry advantages provide support and possibility for its development in the fiber-reinforced composite plastic. More and more researchers begin to focus on the research and application of polyester fibers. Compression properties of PFRP (Polyester Fiber Reinforced Plastic) confined concrete are studied in the present thesis. The work included is as follow:(1) Experimental research on tensile properties of PFRP. According to material characteristic test of non-gummed polyester fiber cloth and gummed polyester fiber cloth with different layers, basic mechanical properties of PFRP, such as breaking strength, breaking elongation percentage and stress-strain curve were obtained.(2) Research on compression performance of PFRP confined concrete. In the thesis, the variables were PFRP of different outsourcing layers and concrete of different strength. Axial compression tests on 36 concrete columns bottom diameters are 150mm and heights 300mm were conducted. Test results show that, compared with plain concrete, strength and ductility of PFRP confined concrete were improved.(3) Strength and ultimate strain model analysis about PFRP confined concrete. Firstly, part of the existing and classical strength and ultimate strain models were introduced. Then, experimental values and calculated model values were compared and analyzed. Lastly, a modified strength model and ultimate strain model for PFRP confined concrete was proposed.(4) Stress-Strain model analysis about PFRP confined concrete. Firstly, part of the existing and classical stress-strain models were introduced. Then, experimental values and calculated model values were compared and analyzed. Lastly, a stress-strain model for PFRP confined concrete is proposed.The results indicate that PFRP confining concrete can improve the strength, toughness and later ductility of concrete. It’s in favor of improving the ability of compression capacity, preventing the occurrence of concrete collapse and delaying sudden destruction.