混凝土耐久性的損壞需要經過數年的暴露才能達成，然而工程界無法等待長達數年的耐久性評估。本研究期望以混凝土加速惡化方法，在短時間內獲得長期暴露的結果，進而評估混凝土構造物之耐久能力。本研究製作普通混凝土（Normal Weight Concrete，簡稱NWC）及人造輕質骨材混凝土（Light-weight Aggregate Concrete，簡稱LAC）兩種混凝土，分別以7、14及28天三種材齡之 圓柱試體進行試驗，其加速惡化條件如下：
　1. 浸泡溶液：清水、飽和硫酸鈉
　2. 浸泡溫度： 、
　3. 乾溼循環次數：NWC為21次、LAC為14次
　　其中乾溼循環參照ASTM C88之循環方式，浸泡16~18小時，烘乾4~6小時。
　　每次循環後量測試體之重量及長度變化，以超音波及衝擊錘試驗評估強度變化情形，配合SEM晶相觀測與鋼筋腐蝕電位了解微結構的變化以及對鋼筋的侵蝕情形。最後，製作三組相同試體於飽和硫酸鈉之浸泡溶液中，以評估加速法之再現性。
　　試驗結果如下所述：
１. 乾溼循環之加速效果最佳，而浸泡溶液及浸泡溫度並無加速效果。
２. 重量折減率之變異係數（C.V.）僅在＋3～－7%以內，證實加速法之再現性良好。
３. 低水灰比能降低鋼筋腐蝕機率，然而水灰比與鋼筋腐蝕電位之間並非正比關係。

　It requires many years to estimate the durability of concrete structures; however, constructors cannot wait for such a long time – this research is aimed to adopt methods of acceleration by speeding up destruction to obtain long-term results of durability in a short term. In this study, there were two kinds of concrete, NWC (Normal Weight Concrete) and LAC (Light-weight Aggregate Concrete), and three curing periods, separately 7, 14 and 28 days. The experiment was carried out on cylinders. The accelerated terms were as follows:
　1. Solutions were water and saturated sodium sulfate.
　2. Temperatures of solutions were 20 and .
　3. Dry-Wet cyclic times were twenty-one for NWC and fourteen for LAC.
　Dry-Wet cyclic method was according to ASTM C88, that is, immersed for 16~18 hours and dried for 4~6 hours.
In each cycle, we measured the mass and length changes, strength changes with UST and impacted hammer, micro structure changes with SEM, and steel corrosion voltage with M.C.M. Finally, three same specimens in each type of concrete were immersed in saturated sodium sulfate solution to evaluate the reappearance of accelerated method.
　The test results are as follows:
1. Dry-Wet cycle had the best accelerated result, but solution and temperature had no accelerated effort.
2. The Coefficient Variation of mass changed only between +3 to –7%. It proved a nice reappearance in this accelerated method.
3. Low water/cement could lower probability of steel corrosion, but water/cement and probability of steel corrosion were not direct proportion.

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