| Summary: | 碩士 === 正修科技大學 === 營建工程研究所 === 100 === In this study, a different volume than the waste tire recycling rubber powder (hereinafter referred to as the rubber powder) to replace the fine aggregate, explore with rubber powder concrete compressive strength and durability; four water-binder ratio (0.35、0.45、0.55、0.65), five kinds of rubber powder content (0%、 5%、 10%、 15%、 20%), a total of 20 groups of the same unit of water consumption (170kg/cm2) dense concrete mix, rubber powder content of 0% with than for the control group.
Unit volume and heavy aggregate dense graded, and then each group was calculated concrete mix, mixing, slump, setting time and air content and other fresh concrete tests, at the same time production 10φ * 20cm specimens conservation to hardened concrete test age; pilot projects, including the ultrasonic pulse velocity、 compressive strength、 volume、 specific gravity、 water absorption、surface resistivity and rapid chloride permeability test, etc..
The results show that the air content of fresh concrete, setting time increased with increasing content of rubber powder, the unit weight with rubber powder content reduced; of ultrasonic velocity and volume proportion of the hardened concrete is reduced with increasing content of rubber powder, absorbent rate increases with the content of rubber powder and water to binder ratio; mechanical properties of compressive strength and modulus of elasticity decreases with increasing content of rubber powder, according to ACI-318 projection modulus of elasticity of the elastic modulus of the study age of the number right, in addition to a small number of the ratio is still the symbol specification value, the majority of the ratio of compressive strength compared with ACI-318 projections compressive strength is low, it is applied to structures must be considered when calculating the structural behavior; durability surface resistivity increases with the increase of the rubber powder, rapid chloride penetration test of the cumulative increase in charge volume and depth of penetration with increasing content of rubber powder, and the other simulated weathering conservation of specimens relative to the durability of some of the more at room temperature conservation of specimens better performance, and may accelerate the hydration reaction of the Department of high temperature to generate more of C2S cause.
The results of this study adopted the Densified Mixture Design Algorithm(DMDA) the rubber powder concrete at low water-binder ratio, a low content of rubber powder, the mechanical behavior and durability can still meet the specification, it is suggested that initially can be applied to the indoor lightweight concrete and non-critical structures to comply with the purpose of saving energy and reducing carbon.
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