Abstract
To verify the damping improvement by replacing partial sand with rubber powder in the concrete process, this study investigated the effects of the rubber powder (5%, 10%, 15%, and 20%) on the mechanical properties and micromechanism of polyvinyl alcohol (PVA) fiber-reinforced concrete. In addition, in order to discuss its damping performance, free vibration test was conducted. Microstructure analyses were conducted by the scanning electron microscope (SEM) test. These results indicated that, as the content of the rubber powder increased, the damping ratio increased, and the compressive strength decreased, but this strength loss can be effectively controlled by adding PVA fiber. The rubber powder with a volume content of 5% and PVA with a mass of 2.4 kg/m3 were the most optimal mixing to balance the strength and damping requirement. According to the SEM test results, the rubber powder was beneficial to improve the damping ratio of PVA concrete, but it aggravated its interface defects.
Highlights
Erefore, the mixture of polyethylene fiber and rubber powder in concrete needs to have the right balance to meet the requirements of strength and damping properties
A detailed experimental scheme is performed on the compressive strength, flexural strength, splitting tensile strength, damping, and dynamic stiffness of polyvinyl alcohol (PVA) fiber-reinforced concrete. e microstructure of rubber-reinforced PVA concrete was studied by scanning electron microscope (SEM)
A total of 6 groups of mixing ratios were designed, with 3 specimens for each group. e water-cement ratio (W/C) of all concrete is 0.4, and the specific mix proportion is shown in Table 4. e corresponding specimen numbers are listed as P0R0 to P1R20, where P represents the fiber and R represents the rubber powder. e rubber powder replacement ratio is 5%, 10%, 15%, and 20%, respectively. e PVA fiber is added by a quantitative proportion of 0 and 2.4 kg/m3
Summary
In this experiment, rubber powder was added by equal volume instead of fine aggregate. E effect of different proportions of the rubber powder on the mechanical properties and microscopic mechanism was studied In this experiment, a total of 6 groups of mixing ratios were designed, with 3 specimens for each group. E free vibration test of the reinforced concrete beams with the size of 80 mm × 80 mm × 1000 mm was carried out, and the damping ratio was measured [33, 34, 38, 39]. The sample must be taken out and dried in the drying baker
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