Performance and hydration study of ultra-fine sulfoaluminate cement-based double liquid grouting material

This paper prepared a novel double liquid grouting material (ultra-fine sulfoaluminate cement-based grouting material). Slurry A was composed of ultra-fine sulfoaluminate clinker, and slurry B was made from ultra-fine anhydrite and ultra-fine quicklime in accordance with a certain proportion. The properties and hydration process of the double liquid grouting material were studied in the process of adding quicklime from 0 wt.% to 30 wt.%, and the double liquid grouting material was studied with micro-calorimeter, thermal-thermogravimetric (DTA-TG) analysis, scanning electron microscopy and energy spectrum technique (SEM-DES), marsh cone flow time, setting time, compressive strength and expansion/shrinkage tests. The results showed that the double liquid slurry had a short setting time when quicklime was added, causing the rapid development of mechanical strength. The more the quicklime content, the longer the flow time of slurry B. The early expansion ratio increased gradually with the increase of the quicklime content. The DTA-TG and SEM-DES test results indicated that the ettringite and aluminum hydroxide are the main hydration products. And the research also found that the mechanical strength of the double liquid grouting material not only depended on the ettringite concentration, but the aluminum hydroxide content was another important influence factor.