為評估改質水庫淤泥應用於基礎工程混凝土之適用性，本研究選用水中及抗滲混凝土，並添加改質水庫淤泥於此二種混凝土中，觀察其新拌混凝土及硬固混凝土性質，藉以瞭解這兩種改質水庫淤泥混凝土，於實際工程應用上之適當添加量及使用方式。研究結果顯示，配比設計之強塑劑使用量須隨改質水庫淤泥添加量增加而增加，以維持新拌混凝土之工作性。添加改質水庫淤泥，將導致混凝土孔隙率增加40%~120%，水泥漿體與骨材間之界面強度下降約50%，造成硬固混凝土機械性質變差，影響程度則隨改質水庫淤泥添加量增加而增加。至於混凝土滲透性之改善程度，則分別與水中及抗滲混凝土之配比設計有關，水中混凝土之改質水庫淤泥合適添加量為5%，抗滲混凝土之改質水庫淤泥合適添加量則為2.5%。

In this study, organo-modified reservoir sludge (OMRS) particles are used as a partial replacement for fine aggregates in underwater concrete and permeability-resistant concrete typically utilized for foundation engineering. Based on a series of measurements on the engineering properties of fresh and hardened concretes, the optimal dosages of OMRS particles for these two kinds of foundation engineering concretes are determined. To maintain a good workability of fresh concrete, it is found that the fraction of super-plasticizer increases as the percentage of OMRS particles used is increased. As compared to the concretes without OMRS particles, the increase of porosity in the two kinds of concretes with OMRS particles is 40~120% while the decrease of interfacial strength between coarse aggregate and cement mortar is roughly 50%. Consequently, their mechanical properties decrease with increasing percentage of OMRS particles. Also, the permeability resistance of concretes with OMRS particles can be much improved, depending on the mixture proportion design of concrete used. Experimental results suggest that the optimal dosage of OMRS particles for underwater concrete with a good permeability resistance is 5% and that for permeability-resistant concrete is 2.5%.

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