- 學位論文
添加強塑劑對再生細骨材混凝土影響之研究
A Study on the Effect of Superplasticizers on Concrete with Recycled Fine Aggregates
摘要
摘要 本文以營建廢棄磁磚製成再生細骨材以不同取代量取代天然細骨材伴製成再生混凝土，再以強塑劑為變數，無添加強塑劑為對照組及有添加強塑劑為實驗組探討其抗壓強度、超音波波速值、燒失量及高溫受熱後前兩項性質之影響。實驗結果顯示，再生細骨材取代比例越高，抗壓強度、超音波波速值越低，添加強塑劑與否都有此現象，對照組在早期(齡期7天、14天)抗壓強度、超音波波速值略低於實驗組，但在後期(齡期28天、91天)會超越實驗組；高溫實驗由25℃加溫至300℃可提升再生混凝土抗壓強度，且在齡期28天提升效果比齡期91天明顯，高溫440℃~800℃為再生混凝土抗壓強度及超音波值主要下降階段，對照組、實驗組均有上述現象，但對照組抗壓強度及超音波波速值均比實驗組表現較佳；燒失量實驗結果顯示無添加強塑劑在同取代量下燒失量均大於有添加強塑劑，以佐證抗壓強度及超音波波速試驗正確性。
並列摘要
Abstract The purpose of this paper is to investigate the effect on the properties of recycled concrete with various percentages of fine aggregates replaced by discarded tile. To superplasticizers as variables, without Addition of superplasticizers for the control group and had Addition of superplasticizers as the experimental group of compressive strength, ultrasonic pulse velocity value, and loss of ignition of recycled concretes subjected to elevated temperatures are carried out in this study. Experiment results showed that the compressive strength and ultrasonic pulse velocity have decreased when more recycled aggregates are used. Addition of superplasticizers does not have this phenomenon, the control group in the early age (7 days, 14 days) compressive strength, ultrasonic pulse velocity value was slightly lower than the experimental groups , but in the late age (28 days, 91 days) will go beyond the experimental groups .Experiment results revealed that the elevated temperature would enhance the compressive strength of recycled concrete at 300℃, and improve at the age of 28 days is better than age of 91 days. In the range 440-800℃, recycled concrete lost most of their original compressive strength and ultrasonic pulse velocity, and the control group, the experimental group were above phenomenon, but the control group, the value of compressive strength and ultrasonic pulse velocity of the experimental group performed better than that. Experiment results revealed that the loss of ignition without addition of superplasticizers are better than a addition of superplasticizers in the same replace. To support the correctness of the compressive strength and ultrasonic pulse velocity test.