- 學位論文
使用廢棄磁磚對再生混凝土性質 影響之研究
Study on Effect on Recycled Concrete Using Construction Tiles
摘要
本文利用廢棄磁磚取代粗骨材，以不同水灰比以及不同取代量拌製混 凝土，探討在不同試驗變數下，再生混凝土之坍度值，抗壓強度之發展曲 線及高溫作用後之抗壓強度，並以燒失量試驗了解水泥漿體之燒失量及水 化程度。 研究結果顯示，再生混凝土之坍度值會隨著取代量增加而增加。齡期 為28 天，在高水灰比(0.6)下，取代量30%、50%、70%時，以取代量0%(即 天然粗骨材)為基準時，普通抗壓強度折減的幅度相較於低水灰比(0.4)少， 減少幅度約2%～11%。高溫抗壓試驗中，齡期為28 天，以常溫、取代量0% 之再生混凝土抗壓強度為基準，取代量及水灰比影響高溫後之抗壓強度折 減率不大，在440℃時高溫抗壓強度折減約15%，在580℃時折減約40%， 800℃時折減約75%。從燒失量試驗則得知，齡期28 天時，再生混凝土之燒 失量及水化程度會隨著再生粗骨材取代量越多而增加，其燒失量在取代量 100%較取代量0%增加約16%~21%，取代量100%之再生混凝土水化程度較 取代量0%之水化程度增加約11%~20%。
並列摘要
The aim of this research is to investigate the effect on the slump values, compressive strength and residual strength at enhanced temperatures of recycled concrete with different water-to-cement ratios and several percentages of replacing coarse aggregate with construction tile wastes. After fracture test, ignition loss test is adopted to determine the degree of hydration of cement paste of the recycled concretes. Experiment results showed that the slump values of recycled concrete were increased when more recycled aggregates are used. With water-to-cement ratio of 0.4, the concrete with 30%, 50%, 70% recycled aggregates were of the order of 2% -11% below the control concrete group (0% recycled aggregates) in compressive strength at 28 days. The recycled concretes had 15% and 40% reduction in residual strength at 440℃ and 580℃ respectively. When approaching the temperature of 800℃, the concrete with recycled coarse aggregates had 75% reduction in residual strength. The test result showed that the ignition loss and the degree of hydration of cement paste were increased when more recycled aggregates are used. Compared to control concrete group, recycled concretes had a 16-21% and 11-20% increasing in ignition loss and degree of hydration respectively.