| 研究生: |
蔡雅蓉 Tsai, Ya-Jung |
|---|---|
| 論文名稱: |
超高性能混凝土的耐久性與管路應用 Durability of Ultra-High Performance Reinforced Concrete and Application for Pipeline |
| 指導教授: |
洪崇展
Hung, Chung-Chan |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 土木工程學系 Department of Civil Engineering |
| 論文出版年: | 2021 |
| 畢業學年度: | 109 |
| 語文別: | 中文 |
| 論文頁數: | 107 |
| 中文關鍵詞: | 超高性能混凝土 、下水道用混凝土管 、CNS 484 、三邊緣軸承試驗 |
| 外文關鍵詞: | Ultra high performance fiber reinforced concrete, Concrete pipes for sewerage, CNS 484, Three edge bearing test |
| 相關次數: | 點閱:106 下載:29 |
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傳統的鋼筋混凝土管會利用徑向鋼筋以提高其抗彎強度,但是使用鋼筋籠要具有足夠的壁厚以避免鋼筋受侵蝕;此外,當施加的載重超過管道承載能力時,通常無預警地以一條主要裂縫形成破壞,表現其較低的延展能力,易產生脆性破壞的特性,且傳統鋼筋混凝土管易受侵蝕而產生嚴重的磨損,需時常進行維護及修復,使得傳統鋼筋混凝土管有著較高的成本消耗。本研究利用超高性能混凝土製作混凝土管,藉由較高的抗拉能力及延展性,改善混凝土管道的各項力學性能,因為裂縫產生時,添加的纖維會產生橋接作用,使得混凝土不易快速形成大尺寸的裂縫而導致直接破壞,且超高性能纖維混凝土有較強的耐腐蝕能力,使用其製作混凝土管,可預期較低的維護成本消耗。
根據試驗結果與分析,超高性能混凝土管可有效的改善傳統管道的破壞模式,尤其是強度驟降段的消除,因為UHPC(ultra high performance fiber reinforced concrete)優異的抗拉能力,使得管道拉力側混凝土不會因開裂而立即失效,因此,在外壓強度上可提升111%~260%,韌性增加69%~201%,當應用於管徑較小的混凝土管製作時,甚至可省去傳統混凝土管中鋼筋籠的使用,仍達到比傳統混凝土管更高的外壓強度及結構特性,同時還可以得到良好的裂縫控制,降低混凝土受侵蝕的速率,提高混凝土管使用的年限。
Traditional reinforced concrete pipes used steel cage to increase their bending strength, but the use of steel cages must have sufficient cover layer to prevent corrosion of the steel bars; in addition, when the load exceeds the bearing capacity of the pipe, it usually breaks without warning and forms a major crack, which shows its low ductility and brittle failure characteristics. Traditional reinforced concrete pipes are susceptible to erosion and cause serious wear. Frequent maintenance and repair are required, which makes traditional reinforced concrete pipes have higher cost of consumption. This study uses ultra-high performance concrete to make concrete pipes. With higher flexural capacity and ductility, the mechanical properties of the concrete pipes are improved, because when cracks occur, the added fibers will have a bridging effect, making the concrete not easy to form large cracks cause direct damage,and ultra-high performance fiber concrete has strong corrosion resistance. Using it to make concrete pipes can expect lower maintenance costs.
According to the test results and analysis, the ultra-high performance concrete pipe can effectively improve the failure mode of the traditional pipeline, especially the elimination of the strength drop. Because of the excellent tensile strength of UHPC (ultra high performance fiber reinforced concrete), the concrete on the tensile side of the pipeline will not fail immediately due to cracking. Therefore, the external compressive strength can be increased by 111% to 260%, and the toughness can be increased by 69% to 201%. When applied to the production of concrete pipes with smaller pipe diameters, the use of steel cages in traditional concrete pipes can even be omitted, and higher external pressure strength and structural characteristics than traditional concrete pipes can still be achieved. At the same time, good crack control can be obtained, the rate of concrete erosion can be reduced, and the service life of concrete pipes can be increased.
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