輕質骨材混凝土使用於建築結構上，具有減輕自重、隔熱、耐震及經濟等優點，但其強度比同配比之常重混凝土低，因此，如何提高輕質骨材混凝土之強度，實為土木工程材料中具研究價值之一課題。實驗結果發現，在輕質骨材與水泥砂漿之界面存在一多孔隙轉換區，其微觀結構不同於整體水泥砂漿，且不同轉換區厚度、勁度及強度皆將造成混凝土材料不同抗壓行為，進而影響輕質混凝土之強度及破壞形式。本研究以微硬度試驗，量測輕質骨材與水泥砂漿界面區附近之微硬度值分佈，以觀察不同水灰比及矽灰含量對孔隙轉換區微觀結構之影響。其次，採用有限元素套裝軟體ABAQUS，建立輕質骨材水泥砂漿抗壓之數值分析模式，以探討孔隙轉換區厚度及勁度對界面區附近應力分佈之影響。最後，進行輕質骨材混凝土抗壓試驗，探討不同界面區微觀結構如何影響輕質骨材混凝土之抗壓行為。

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