氧化钠含量对赤泥基地聚合物同步注浆浆液性能影响分析OA

[Purposes]To optimize the performance of red mud-based geopolymer for tail grout-ing,the effects of Na2O content on the fresh properties,hardened mechanical properties,electrical characteristics,and microstructure of the slurry are investigated in this study.[Methods]A single-fac-tor experimental design was employed,with Na2O content(0～8%)as the variable,to systematically analyze the slurry's density,fluidity,consistency,stone rate,bleeding rate,setting time,unconfined compressive strength,resistivity,electrochemical properties,and microscopic morphology.[Results]The results indicate that as the Na2O content increases,the slurry density gradually increases,fluidity decreases,the slurry becomes more viscous,and the setting time is significantly shortened.The com-pressive strength exhibits an exponential growth trend,with a significant increase at 5%～8%Na2O content,reaching a maximum of 60.64 MPa at 28 d.Resistivity increases with Na2O content,and long-term curing further enhances the material's microstructural compactness.Electrochemical tests show that higher Na2O content promotes the formation of geopolymerization products,improving ma-terial durability.Scanning electron microscope analyses reveal that increasing Na2O content transforms the material from a porous and loose structure to a dense and uniform one,with the 5%～8%content samples exhibiting the most favorable microstructural characteristics.In summary,Na2O content in the range of 5%～7%optimizes slurry performance,balancing workability and mechanical durability.