本研究探討水泥砂漿相同水灰比(w/c = 0.6)、拌合步驟、養護及環境條件之下，不同擴散型式之碳化深度與砂漿基本工程性質之關係，並比較四種不同碳化深度量測法。
研究結果顯示：(1)各項基本工程性質皆會因碳化深度的增加而增加，超音波波速約提升5.47~7.42 %、動態彈性模數約提升13.68~20.63 %、動態剪力模數約提升18.57~29.31 %、抗壓強度約提升45.96~62.50 %。(2)四種不同碳化深度量測法中，就量測便利性而言，酚酞測定法最快，其次為X光繞射法，X光顯微分析，最後為熱重量分析，其中酚酞測定法、X光繞射法、熱重量分析三者所量測碳化深度結果相近，但X光顯微分析的結果會隨著選取點位的方式而異，故碳化深度較不確定。(3) 水泥砂漿會因中性化後pH值約由12下降至8~11左右，但其pH值變化與碳化深度之間的關聯性並不顯著。

This study investigates the relation between the carbonation depths resulting from different types of diffusion and the engineering properties of the mortar prepared with the same water-cement ratio (w/c = 0.6), mixing procedure, curing and environmental conditions.
The results showed that: (1) Engineering properties of the mortar specimens were improved by the increased carbonation depth by 5.47 to 7.42% for the ultrasonic pulse wave speed, by 13.68 to 20.63 % for the dynamic elastic modulus, by 18.57 to 29.31 % for the dynamic shear modulus, and by 45.96 to 62.50% for the compressive strength. (2) In consideration of the measuring convenience among four detecting techniques for the carbonation depth, the phenolphthalein titration is the fastest, the X-ray diffraction method ranked the second, the X-Ray energy dispersive spectroscopy ranked the third, and the thermal gravimetric analysis was the slowest. Similar carbonation depths were obtained using the phenolphthalein titration, X-ray diffraction and thermal gravimetric analysis. In contrast, fluctuating carbonation depths were obtained by the X-ray energy dispersive spectroscopy because of the dispersed selections of test points. (3) Due to carbonation, the pH value of the mortar dropped from about 12 to around 8 to 11, but the correlation between the pH value and the carbonation depth is insignificant.

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