- 學位論文
混凝土新舊界面之施工品質與力學性質之探討
The Research of old and new concrete interfaces cohesive behavior and quality control
摘要
混凝土（Concrete）是土木與建築的結構體中，不可或缺的主要營建材料之ㄧ；土木與營建工程之硬體設施乃提供人類安全且有保障的居住環境與工作場所，也滿足了民眾食、衣、住、行、育、樂等各方面的需求，所以無論時代的轉變如何快速，混凝土依然是當今多數建築結構的主要材料。 基本上，混凝土之澆置，應以一次澆置完成為原則，但因為受到技術、時間、施工人力乃至供料速度等因素之影響或在澆置作業中遇到突發情況而導致被迫澆置作業必須中斷，因而需設置施工縫；或建築物如需臨時增建、擴建或補強時，即需要將舊有建築物之混凝土與新澆製混凝土作結合此種新舊混凝土的交接面亦產生縫隙，當此一結合介面若處理不當，即可能造成結構弱面的產生，進而使得建物本身的強度與安全性大幅降低，嚴重時，即可能導致民眾生命財產安全之危害。 故本研究將探討新舊混凝土介面不同狀態之力學行為，藉由三種實驗方式，以製作混凝土試體在不同條件情況下，以實測及探討新混凝土之黏結力與摩擦力，所能發揮之結構抵抗角色，進而驗證此其新舊混凝土交接面所能提供的力學行為與施工品質。
並列摘要
Concrete is one of the essential materials for construction and building industrys. The form or frame of constrution and building project not only can provides a safe and sure environment for habitation and working but also contents with every aspect of their needs for the people on eating, clothing, living, traffing, educatiing and entertainment. Nowadays, concrete is still the main material in almost all architectures and hasn’t changed much throghout time. Basically, the placing activity of concrete should be done at one time. But there are a few reasons that could change it. For instance, the placing precesure it could be affected by some factors, such as technigue skill, time, man-power and the speed of the supply. During the placing of concrete, something could happen to cause its process being cut off, so wxpansion and contraction is needed to set up before this happens. If the constrution is required to be supplemented, wxpanded or intensified that connect iii with the old-new concrete is necessary and world create a crevice along the connecting interface. When the connection surface couldn’t be done well, it might bring a soft side of construction. Moreover, that could substantially reduce the safety and the steady of the construction itself. The worst of all is that might terminate the resident’s live, and the safety of the property. To sum up, three scientific methods of this had study be done to discuss old-new concrete cohesive behavior in different stage. Also the experiment and discussions will derive the cohesion and friction of new concrete and may play appropriate role in resisting construction. Furthmore the research result can be used to verify old-new concrete connecting surfaces may supply resistance with quality performance in constuction.