【摘要】 本研究利用废弃混凝土制备再生骨料过程中产生的再生微粉制备了一种高性能低碳型地聚合物注浆料。通过对再生微粉进行热-机械协同活化处理并在碱激发剂的作用下制备再生微粉基地聚合物注浆料，研究了活化制度对注浆料工作性能、力学性能、泌水率、24 h自由膨胀率以及微观结构的影响。性能测试表明除24 h自由膨胀率外，当热活化温度不变时，再生微粉基地聚合物注浆料的工作性能、力学性能、泌水率均随微粉球磨时间的延长先升高后降低。当球磨时间不变时，注浆料的性能随热活化温度的升高先升高后降低。再生微粉热活化温度为750℃、机械球磨时间为10 min时，制备的再生微粉基地聚合物注浆料的性能最佳。微观分析表明热-机械协同活化极大地提高了再生微粉的活性和比表面积，进而改善了注浆料的致密程度，活化制度的改变对注浆料的性能和结构的影响极为显著。再生微粉基地聚合物注浆料的制备为高值化处理废弃混凝土提供了新思路。更多还原

【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.更多还原