本研究探討以飛灰及石灰石粉取代部份水泥後砂漿的耐久性及力學性質，就力學性質而言，先發現使用石灰石取代水泥10 %時，強度略為下降。因此，希望藉由添加飛灰利用其具卜作嵐反應來，彌補所失之強度，再進一步探討其耐久性。耐久性試驗的項目包括抗硫酸鹽能力、水中膨脹量、乾縮、預壓下的碳化深度及氯離子擴散試驗、碳化及鹼矽粒料反應(alkali-silica reaction，ASR)。其中，為了模擬現地建物平常處於受壓狀況，本研究量測受壓下的碳化深度及氯離子擴散。此外，由於自然環境下碳化與鹼矽粒料反應同時發生，因此試驗過程中亦嘗試預先碳化後進行加速ASR試驗、加速ASR後碳化及加速碳化與ASR交替試驗，以探討兩者同時作用下砂漿的劣化行為。
加速ASR試驗係依照ASTM C1260進行，而加速碳化試驗則是將試體置於50% CO2中再於不同齡期後取出。結果顯示，以飛灰取代水泥15%及石灰石取代水泥10%時，相較於未以飛灰及石灰石取代水泥的控制組而言，強度並未明顯降低，乾縮量、水中膨脹量及ASR膨脹量均受到抑制。碳化試驗的結果也顯示，適當的碳化可以抑制ASR的發生，因為碳化可降低孔隙水中的鹼量及增加微觀結構緻密性，漿體強度亦略為上升故可抵抗ASR的膨脹。

This study explores the mechanical properties and the durability of mortar with fly ash and limestone powders. The compressive strength of the mortar was reduced by 10% limestone addition so the fly ash was further added in order to compensate the strength loss by the pozzolanic effects in the long term. The durability of the mortar was also explored, including the sulfate resistance, expansion in water, shrinkage, alkali-silica reaction (ASR), carbonation, and chloride migration. In order to simulate the natural conditions onsite, the carbonation and the chloride migration was conducted in specimens subjected to prestress. In addition, this study tentative used new accelearated ASR techniques, such as pre-carbonation before ASR, carbonation after ASR, and alternative carbonation and ASR, to simulate the combined deteriorations in nature. The accelerated ASR was conducted in accordance to ASTM C1260 and the accelerated carbonation was conducted by exposing the specimens into 50% carbon dioxide. Results showed that the mortar with 15% fly ash and 10% limestone had low shrinkgage, expansion in water, ASR expansion, and no clear strength reduction. Moreover, the carbonation effectively reduced the ASR due to the reduction of alkalis in pore water, densified microstructure, and strength increases.

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