爐石添加量對超微粒水泥漿體基礎物理性質影響之研究

Abstract

本研究旨在探討不同之爐石添加量對超微粒水泥漿體性質之影響。本研究藉由不同爐石添加量以及不同水灰比進行各項試驗，以推求爐石對漿體所造成之影響。試驗內容包括砂漿的單壓、抗彎、抗剪強度試驗以及淨漿穩定性和流動度試驗。 試驗結果顯示添加爐石有助於漿體之單壓、抗彎以及抗剪強度，但添加量存在一最佳配比，而最佳配比依水灰比不同會落在不同範圍內，水灰比低於2時爐石添加量以50-70%為最佳，當水灰比介於3-5時則為40-50%。漿體中爐石含量多寡亦會影響漿體之穩定性及流動性，爐石含量越多時，漿體會有越高之穩定性及越差之流動性。而值得注意的是添加爐石對於水灰比介於3-5之漿體的晚期強度提升有較明顯之幫助，這也顯示了在不同水灰比的情況下，添加爐石對漿體亦會產生不同程度之影響。

The object of this study is to investigate the effects of slag content on the basic physical properties of microfine cement grout. Different ratios of slag content and different water to cement ratios (w/c) were used to evaluate the effects of slag content on the grout. The experiments included compressive strength, flexural strength, shear strength of sand grouts, stability and fluidity of net grouts. It was found that compressive strength, flexural strength and shear strength of sand grout increase with slag content. However, there exists an optimum formulation for a specific w/c. while the w/c is less than 2, the optimum slag content ranges from 50% to 70%; while w/c is between 3 to 5, the optimum slag content ranges from 40% to 50%. It was also found that the stability and the fluidity of net grout are affected by slag content. The higher the slag content, The higher the stability and the lower the fluidity. It is noticeable that while w/c ranges from 3 to 5, long term strength of the grout increases significantly because of the existing of slag in the grout, i.e. while w/c are different, the grouts are affected differently because of the slag added to the grouts.