209 / 2022-06-05 17:36:47

Research on comprehensive properties of concrete replaced fine aggregate by recycled waste glass fiber reinforced epoxy resin matrix composites

Pending

with the application of fiber reinforced plastics(FRP) more and more widely, FRP recycling has become an urgent problem to be solved. At present, there are many methods of plastic recycling, which can be divided into mechanical recovery, chemical recovery and energy recovery. The method of crushing waste plastic into recycled powder is mechanical recycling, and then the recycled powder is mixed with thermoplastics or other materials, and the recycled powder becomes a new recycled material. It is found that the ductility and mechanical properties of concrete can be improved by using the shape, size, and dosage of FRP instead of concrete fine aggregate properly. Therefore, based on the above research ideas, this research studied the feasibility of applying recycled powder from waste epoxy plate to concrete and explored the new recycling process of thermosetting epoxy resin.

In this research, the molding test of plastic concrete was designed, and the apparent density, slump, tensile strength and compressive strength of concrete were tested. Therefore, the physical and mechanical properties of concrete are obtained, and the influence of epoxy plate recycled material dosage and particle size on the concrete test results is analyzed.

The waste epoxy board was crushed to obtain recycled material. Based on C35 mix proportion design, the mix proportion of plastic concrete is calculated. Sand is replaced by EP recycled materials of different particle sizes with equal volume ratios of 0, 5%, 10% and 15%, respectively. The effects of particle size and content on the physical properties (density, slump) and mechanical properties (compressive strength and tensile strength) of concrete are analyzed by using scientific instruments such as SEM and contour scanner.

The experimental and test results show that epoxy plate recycled material can reduce the apparent density of concrete and increase the slump of concrete. When the content of epoxy plate recycled material increases, the tensile strength increases first and then decreases; when the particle size of epoxy plate recycled material increases, the tensile strength increases. When the content of epoxy plate recycled material increases, the compressive strength increases first and then decreases. When the content of epoxy plate recycled material is less than 10%, the particle size of epoxy plate recycled material is small and the compressive value is large.

By the analysis of experimental factors, the optimum amount of epoxy plate recycled material has the greatest influence on the slump. The particle size of epoxy plate recycled material has the greatest influence on tensile strength, and the optimal particle size is 4-9mm. The optimal dosage is 10%. The particle size has the greatest influence on the compressive strength of 14d and 28d. The optimal particle size is less than 4mm.

Based on the above test results, when the amount and particle size of epoxy plate recycled material are in a certain range, the concrete has a good compressive performance, which proves that it is feasible to apply waste epoxy plate recycled material to concrete, and provides a certain reference for the practical application of plastic concrete in the future.