Green Concrete Using Waste Tire And Its Structural Behavior Analysis

Abstract

The concrete industry is one of the main consumers of natural resources, many efforts were made to replace natural resources with non-depleted one without significant influence on concrete properties. In numerous research studies, different waste materials were incorporated, depending on the properties needed from composites. One of today’s major environmental problems is non-decaying waste tires: left in the environment, they present a great danger for the earth and leaving creatures. This study utilizes the waste tire crumb rubbers in concrete as a partial replacement of the natural fine aggregate in C-25 concrete grade to produce a green concrete and to investigate its structural behavior with a reinforcement bar using FEM. An experimental study was carried out on the basic mechanical properties of concrete to investigate the effect of waste tire rubber on the workability, compressive, tensile, flexural strength and stress-strain relationship. FE and numerical studies were also carried out to determine the impact of resistance and deformation of rubberized concrete. A modified concrete was prepared by replacing sand in concrete with rubber aggregate by varying the replacement proportion from 4% to 16% with an increment of 4% by volume. Among different pretreatment used to increase the bond between the rubber particles and cement matrix, washing the rubber with 5% diluted H2O2 was used to enhance the adhesive properties. After having the mechanical property from the experiments, an effective finite element model was developed in ANSYS workbench to analyze the structural behavior of reinforced CRC. The stress-strain diagram from the experiment was described by command and used as input data in ANSYS simulation. From the experiment, it was found that the optimal rubber improves the strain capacity and its stress-strain curve shows more nonlinear behavior than NC. From all percentages, CRC8 shows best relative performance it improves impact resistance, energy absorption and ductility of concrete by decreasing the weight of the structure. CRC8 gives an average compressive strength of 28MPa which is greater than the minimum requirement. At failure, CRC exhibited more ductility with large ultimate deflection and more uniform crack distribution. The bond behavior of CRC8 with the deformed bar is only slightly lower than NC. ANSYS output result shows that the structural behavior like maximum stress is comparable except the reduction in compressive strength. The results of FEA positively verified that rubberized concrete could absorb more impact energy before failure. At ultimate load, elements are failing more in NC than CRC8.