奈米SiO2及淨水污泥灰對水泥漿體新拌性質之影響

Effect of Nano-SiO2 on the Fresh Behaviors of Water Works Sludge Ash Paste Specimens

本研究擬探討奈米材料(nano-SiO2)及淨水污泥灰對水泥漿新拌性質之影響，以符合淨水污泥資源化的目的。研究果顯示，由於奈米級SiO2和淨水污泥灰具有高比表面積效應，使水泥漿體流動性變差、初終凝時間縮短。奈米SiO2的取代量對水泥漿體的需水量影響非常顯著，當奈米SiO2取代量為8%時，水泥漿體的需水量將近增加一倍，而以10%以內淨水污泥灰取代的水泥漿體正常稠度用水量影響不大；並藉由統計分析建立水泥漿體正常稠度用水量與奈米SiO2和淨水污泥灰取代量之間的數學關係式。

In this research, nano-SiO2 materials are added to water works sludge ash to create mixtures, which then form a portion of concrete. The influences of nano-SiO2 materials and water works sludge ash on cement paste fresh behaviors are evaluated. Results show that with the high surface effect of nano-SiO2 materials and water works sludge ash, the flowability and setting time reduce with increasing amount of cement replaced and of nano-SiO2 materials added. The effect of nano-SiO2 materials on cement paste water demand is obvious. Cement paste water demand doubles when nano-SiO2 materials replace 8 % of cement, but the water demand remained the same as control cement paste when mixed with 10 % water works sludge ash. The mathematics model of the relationship between the amount of nano-SiO2 materials, water works sludge ash and cement paste water demand of standard consistency was produced by statistics analysis.