Research on Air Content Control Technology for Ultra-high Performance Grouting Material
This study explored the effects of different dosage of defoamer and air-entraining agent on the flowability,flow rate,air content,and compressive strength of ultra-high performance grouting materials through experiments to find an optimal mixture.Results show that air-entraining agents can enhance the flowability of grouting materials and improve the flow rate of the grout,but excessive addition can significantly affect the early strength and late strength of high-performance grouting materials.As the dosage of a defoamer increases,the flowability and flow rate of the grouting material gradually decrease,and the early strength and late strength are almost unaffected.When the dosages of defoamer and air-entraining agents are 5.6‰o and 0.37‰o of the total weight of the cementitious materials,respectively,the performance of the grouting materials meets the performance index of Class Ⅲ grouting materials of GB/T 50448-2015"Technical Code for Application of Cementitious Grouts".
万方数据
维普
