混凝土污水管之耐久性設計與驗證

The Design and Verification on Anti-Sulfate Corrosion Concrete Sewage Tubes

本研究主要探討不同配比模式（ACI配比法、緻密配比法（DMDA））、不同水泥型別（Type I 、Type II、鋁質水泥、中細度爐石水泥）、及不同卜作嵐材料添加量，設計五組配比，分別拌製混凝土並進行相關性質量測（坍度、坍流度、工作性、單軸抗壓強度、超音波波速、表面電阻係數、氯離子電滲、硫酸鹽侵蝕等），作為評定其抗硫防蝕耐久性能之指標。驗證結果顯示，使用顆粒堆積之緻密配比法所拌製之混凝土，不僅具高工作性，各項工程性質及耐久性指標均有較佳之表現，而使用ACI配比方法設計之混凝土，即使使用Type II或鋁質水泥，相應之工作性、工程性質、及耐久性指標均不如以緻密配比法所設計之高性能混凝土。研究結果亦發現依據「緻密配比法」適當地添加飛灰、爐石等卜作嵐材料，能有效提昇混凝土抗硫防蝕之性能，且傳統設計法認為水泥越多強度愈高、耐久性愈佳之論點，由本研究結果發現有必要重新審慎考量。

This research is to investigate concrete properties as a way of evaluating the concrete durability of anti-sulfate corrosion functions. Five groups of concrete specimens with different proportions, such as different proportion modes (ACI mixture proportion design, Densified mixture designed algorithm, (DMDA)), different cement types (Type I, Type II, Calcium aluminum cement, medium fineness blast furnace slag cement) and the different increasing quantity of pozzolanic materials, are then blended. Results show that concrete produced by Densified Mixture Designed Algorithm will have a higher workability and better durability than those concrete designed by ACI mixture proportion, even it was blended by Type II or Calcium aluminum cement. Results also demonstrate that if pozzolanic materials, such as fly ash and slag, are properly used in accordance with Densified Mixture Designed Algorithm, the anti-sulfate corrosion function will be enhanced. According to this research, some traditional points of view in the field of concrete science have to be revised, for example the more the cement, the higher the strength and the better the durability of concrete.