本研究以飛灰取代部分水泥的方式添加於波特蘭I型水泥中，經過浸泡於10%硫酸鈉溶液環境28天齡期之後，經單軸壓縮試驗、四點彎曲試驗、及斷裂韌度試驗了解硫酸鈉溶液對波特蘭I型水泥和飛灰水泥是否會影響浸泡前後的強度，並討論其浸泡前後之力學差異性。
研究結果顯示，由於卜作嵐反應的速率在室溫下進行頗為緩慢，所以添加飛灰之水泥在早期強度略遜於波特蘭純水泥。但隨著浸泡齡期的增加，飛灰水泥的抗硫酸鈉能力逐漸提昇，到了浸泡第28天齡期時，反較純水泥佳，而飛灰取代率10%以及20%，在三種基本力學試驗上，都能得到較佳的力學性質。經試驗結果得知，飛灰取代率採用10%~20%之間的飛灰水泥較能抵抗硫酸鈉溶液。

The study attempts to investigate the basic mechanical properties of Portland Type I cement replaced by fly ash immersed in 10% Na2SO4 solution environment. The uniaxial compression, four-point bending and fracture toughness tests were performed and the corresponding strength of each test has been determined in this study.
This study finds that at the early stages, the strength of Portland Type I cement partially replaced by fly ash is lower than that of the pure Portland Type I cement. As immersion time increases, the strength of the cement with fly ash becomes greater than that of the pure cement. The experimental results also show that the Portland Type I cement partially replaced by 10%~20% fly ash immersed in 10% Na2SO4 solution environment for 28 days has better mechanical properties.

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