摘要 本文利用掃描式電子顯微鏡(SEM)、微區元素分析(EDS)及X光粉末繞射儀(XRD)等儀器進鹼-骨材反應生成物(鹼-矽膠體)進行一系列的微觀分析，探討鹼-矽膠體於形貌、元素組成及化學組成的特性。本研究所觀察之鹼-矽膠體主要生成於混凝土角柱及砂漿棒表面、裂縫以及開裂面，而混凝土試體使用之骨材來源為國內花東沿岸及南部里港溪，經檢測確定具有鹼-骨材反應危害性、並持續置放於不同的養治環境下，外觀產生顯著開裂且生成白色膠體。經由微觀分析結果發現，隨著控制變因不同，鹼-矽膠體具有不同的結晶形貌、其組成亦有不同特徵性，利用此種特性建立一套鑑定鹼-矽膠體之準則、作為輔助確認混凝土試體具有鹼-骨材反應危害性的另一佐證，並提供後續相關研究之應用。 ABSTRACT This research used aggregates from the seacoast of Hualien and Taitung the South Ligang River in Taiwan to make concrete prisms and mortar bars. And first tested aggregates to learn that they indeed had the hazardous of alkali-silica reaction. Then the concrete prisms and mortar bars were placed in several curing conditions. It was observed that cracks and some white gel, which was called ASR gel, was produced under the research environment. The ASR gel was seen within the surface, cracks, and surface grooves of the samples. The crystalline alkali-silica reaction product (ASR gel) is characterized by scanning electron microscope(SEM), quantitative X-ray energy dispersive spectrometry(EDX) and X-ray diffraction(XRD). Based on the results of the microscopic analysis, the research built the correlation of composition and morphology, and created criteria for the finding of the ASR gel. Overall, the research serves as an affirmation of Alkali-Aggregate Reaction and a follow-up study of its application.
