在過去建築材料的運用上，提升水泥於複雜環境中的抗侵蝕能力已有眾多的研究，其中包含抵抗硫酸鹽環境抵抗能力也是重要的研究項目之一。在ASTM( American Society for Testing and Materials )通常針對水泥受到硫酸鹽類侵蝕後的膨脹程度以及抗壓強度來定義其對此環境的抵抗能力強弱。而本研究中，我們嘗試採用抗壓強度以及斷裂韌度來觀察水泥力學性質上於硫酸鈉環境中的變化結果來解釋其受腐蝕的行為變化，並利用超音波檢測實驗作為交叉比對，以提供後人作為參考依據。
研究中使用三種飛灰爐石粉比例取代部分水泥，分別為0%、15%、30%的取代率，然後將三種取代率水泥試體分別浸泡於0%、5%、10%、15%不同重量百分濃度的硫酸鈉養護環境下進行養護，而於0天、7天、14天、28天、56天、84天養護齡期取出進行基本力學試驗以及超音波檢測。
實驗結果顯示，三種取代率水泥於0天至28天養護齡期時所表現的力學性質皆隨養護天數增加強度有上升的趨勢，28天後強度趨於穩定，其中28天的強度以10%硫酸鈉濃度中15%飛灰爐石粉取代率的強度最高。而超音波檢測結果顯示，各取代率水泥試體於各濃度硫酸鈉溶液中，其結構表現上，P波與S波於0天至28天有上升的趨勢，28天後變化即趨於穩定些微上升或下降。

There are many researches to study the resistant ability of cement as building materials in the complex environments, and the study of sulfate resistance is one of the most important subjects. American Society for Testing and Materials (ASTM) uses the expansion coefficients and uniaxial compressional strengths of the cements as indices to define the resistant ability of cement in the sulfate environment. In this study, the uniaxial compressional strengths and mode I fracture tougthnesses were used to record the mechanical behavior of cement samples in the sulfate environment. In addition, the P wave and S wave velocities were measured by the ultrasonic testing. These results were discussed and compared in this study.
In this study, three different amounts of fly ash and blast slag(FABS) were selected for testing. They are 0%, 15%, 30% in weight, respectively. The Portland cement samples were mixed with these ingredients. Four different sulfate enviroments were prepared for curing. They are 0%, 5%, 10%, 15% of Na2SO4 in weight of solution. The testing periods was recorded at 0, 7, 14, 28, 56, 84 days, respectively. In each time interval, the uniaxial compressional tests, mode I fracture tougthnesses test, and the ultrasonic testing were performed.
The experimental results show that both the uniaxial compressional strengths and mode I fracture tougthnesses increase as the curing time increases up to 28 days. After 28 days, both the uniaxial compressional strengths and mode I fracture tougthnesses reach stable values. It is found that the strengths of samples with 15% FABS reach maximum in 10 % of Na2SO4 in weight of solution. The results from the ultrasonic testings show that P and S wave velocities become greater as the time increases up to 28 days. However, after 28 days, these values become stable.

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