- 學位論文
以混凝土塊、磁磚及紅磚製成之再生粗粒料對混凝土影響之研究
The study of concretes made with recycled concrete lumps, bricks and tiles as coarse aggregates.
摘要
本文將廢棄磁磚及紅磚經破碎，清洗和篩分析後與混凝土塊三者以不同比例拌製而成再生粗粒料，以現地的配比表(水膠比0.44)全取代粗粒料灌製再生混凝土，探討其抗壓強度、超音波波速、受高溫殘餘抗壓強度、受高後超音波波速。 試驗結果顯示再生混凝土在齡期28天的抗壓強度皆會達到配合設計強度31.57(MPa)，其中混凝土塊量較多(65%)的混凝土，中後期的抗壓強度發展趨勢會和對照組相似，強度折減比例約85%。隨著混凝土塊量減少磚類的比例增加，混凝土的抗壓強度會隨著下降。當混凝土塊量不足(低於50%)磁磚量較多(35%)時，混凝土在齡期28天抗壓強度會有小幅度的折減，從試體破壞剖面可看出磁磚釉面會造成試體提前破壞導致抗壓強度較不均勻。從超音波波速可測出試體內部的緻密程度，隨著齡期的增加，超音波波速也越快，顯示越後期其試體內部越緻密，相對抗壓強度也越高。 高溫試驗中當溫度加熱至300℃再生混凝土的抗壓強度並沒有上升反而下降，在混凝土塊中含有少許的不純物，在溫度達到300℃時會熔解流出而產生縫隙。高溫超音波因試體內部的水分及水化產物的分解，波速會隨著溫度的上升而下降。
並列摘要
The article is discussed the broken discarded tile and brick after cleaning with the discarded concrete blocks stirred them to the recycled coarse aggregates in different ratio, and replaced the coarse aggregates poured to the recycled concrete in field mix design form, which compressive strength、ultrasonic pulse velocity value、compressive strength after subjected to high temperatures and ultrasonic pulse velocity value after subjected to high temperatures. The experiment revealed the compressive strength of the recycled concrete would be the With the design strength31.57(MPa), in those discarded concrete with more discarded concrete blocks(65%) which development tread of compressive strength would be similar to the control group – ratio of discounted strength around 85%. Accompany with reducing discarded number of the concrete blocks and increasing the ratio of brick, the compressive strength of concrete would be descended. While the unsufficient number of discarded concrete blocks and increasing number of brick, the compressive strength of concrete would be a little bit discounted in the 28th day. From the experiment’s section of destruction found out the glaze surface of tile could cause the compressive strength non-uniforming when the experiment be destroyed ahead of time. From the ultrasonic pulse velocity value could test the dense level of interior experiment. Accompany with increasing the days, and also the ultrasonic pulse velocity value was getting faster. It revealed the interior experiment was much denser, and the compressive strength was getting higher. The compressive strength of the recycled concrete was not rising, but was decreasing instead while the temperatures rose to 300 degree during the experiment of high temperatures. There were few impure material in the discarded concrete blocks would melt and resulted in cracks while the temperatures was getting up to 300 degree. Because of the water and hydrated product of the interior experiment would be decomposed, the speed of ultrasonic pulse velocity value was rising or decreasing accompany the temperatures.