- 學位論文
新世代高性能混凝土抗裂指標與力學性能研究
The Study of Crack Resistance Index and Mechanical Properties for New Generation High Performance Concrete
摘要
為了應對高強度混凝土的脆性破壞行為，大量鋼筋的使用而導致施工與澆置上的困難。過往許多研究指出添加鋼纖維在高強度混凝土中可以增加混凝土的韌性，將高強度混凝土脆性的破壞模式從而轉換成韌性破壞，且紓解鋼筋密集配置的問題。新世代高性能混凝土擁有使用自充填高流動性的配比設計，即使添加鋼纖維進入配比中，在澆置時仍有減少震動搗實，易泵送、澆置速度快、可有效節省人力及工時的特性。新世代高性能混凝土除了在力學性質上擁有優異表現外，在工作性上的良好優異表現也能確保施工品質完善。在未來的工程實務上，新世代高性能混凝土將被廣泛的使用，探討其各項性質變成研究中的一個必修課題，有利後續研究學者跟工程師去分析以及設計。 本研究對收縮裂縫進行探討，對於鋼纖維抑制收縮產生的束制裂縫效果進行實驗，並量化實驗結果進行分析。添加鋼纖維的新世代高性能混凝土除了在抗裂能力下有有效的提升外，本研究亦探討添加鋼纖維的新世代高性能混凝土各項力學基本性質，並從研究群以及文獻中提出的各項預測式進行回歸以及整理，最後提出預測式以便工程師在分析時可以直接參考及使用。
並列摘要
For the brittle failure behavior of high strength concrete, a lot of reinforcement is required in construction, which will cause steel congestion and pouring difficulties. Many previous studies have pointed out that adding steel fiber to high strength concrete can increase the toughness of concrete, and convert the brittle failure behavior of concrete into ductile failure behavior. It also solves the congestion of the reinforcement in the construction. The new generation high performance concrete has excellent seismic performance and crack resistance. The new generation high performance concrete uses self‑compacting concrete (SCC) design. Even if steel fiber is added to the mixture, it can still reduce vibration and tamping during pouring. In addition to the excellent mechanical properties of the new generation high performance concrete, the excellent performance in workability can also ensure perfect construction quality. The new generation high performance concrete will be widely used in the future. Discussing its various properties has become a compulsory subject in research, which is helpful for subsequent scholars and engineers to analyze and design. In this study, we conduct the shrinkage crack experiment for new generation high performance concrete and quantify the shrinkage crack experiment results. This study also explores the mechanical properties of the new generation high performance concrete. We organize and regress various formulas proposed by the literature. The last, we propose the predictive formulas for new generation high performance concrete so that the engineers can directly refer to them in analysis and application.