Abstract: By utilizing recycled powder generated in the preparation process of recycled aggregates from waste concrete, this work made a successful attempt to obtain a high-performance and low-carbon geopolymer grouting material. The main points in the preparation of the geopolymer grouting material were thermal-mechanical synergistic activation treatment of the recycled powder, and the use of an alkali activator. The effects of activation schedule on the working performance, mechanical properties, bleeding rate, 24-hour free expansion rate, and microstructure of the product were studied. Performance tests showed that the increase of ball-milling time length of the powder along with a constant thermal activation tempe-rature resulted in the increase → decrease variations of working properties, mechanical properties, and bleeding rate of geopolymer grouting material, except for the 24-hour free expansion rate. And when ball-milling time length was controlled as a constant, the rise of thermal activation temperature also led to the increase → decrease variations of the product performances. The recycled-powder-based geopolymer grouting material prepared using a thermal activation temperature of 750 ℃ and a ball-milling time length of 10 min achieved the best performance amongst all the samples. The analyses of XRD and SEM confirmed large improvements in activity and specific surface area of the thermally-mechanically activated recycled powder, which consequently enhanced the densification of the grouting material. The change in activation schedule has a crucial impact on the properties and structure of the grouting material. The preparation of recycled-powder-based geopolymer grouting material provides a new inspiration for promoting high-value utilization of waste concrete.
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2024, Vol. 38 
