改性木素高效注浆泵送剂GCL1-3U的性能研究

通过对高效减水剂GCL1-3U进行改性优化．研制了盾构注浆材料用高效泵送剂GCL1-3U。试验结果表明：当GCL1-3U掺量为0．4％时。浆料流动度由未掺泵送剂时的140mm提高至169mm；其3h的相对流动度损失率仅为21．2％。而同一时问内掺加麦斯特减水剂的浆料流动度损失率为32．0％。掺加0．5％GCL1-3U的浆料2h内的泌水牢为4．9％。远低于未掺加减水剂浆料的8．6％。GCL1-3U具有适宜的缓凝性和明显的增强作用。掺量为0．4％时注浆材料凝结时问为9．4h。可使浆料的28d抗压强度提高52％。浆材胶凝体系流变性能的研究显示，此体系属于假塑性流体，具有剪切稀化的性质。GCL1-3U的加入进一步降低了胶凝体系的表观粘度．因此提高了浆材的流动性。

Properties of modified lignosulfonate high-performance grouting pumping aid GCL1 -3U

High-performance pumping aid GCL1-3U used in the shield grouting was prepared by modifying high-range water reducer GCL1-3A and the properties were studied. The results revealed that,when GCL1-3U usage is 0.4%,the fluidity of grouting material is enhanced from 140mm to 169mm and its relative fluidity loss ratio is only 21.2% in 3h,contrast of 32.0%,the fluidity loss ratio of the grouting material was added Master water reducer.The bleeding rate is 4.9% in 2h at a blend ratio of 0.5%,which is lower than that of the grouting material(8.6%).GCL1-3U has proper retarding action and obvious function of strength enhancing,the setting time is 9.4h at a blend ratio of 0.4% and the 28-day compressive strength is increased by 52%.Rheology study reveals that the cementitious system of the grout is pseudoplastic fluid with shear-thinning property.GCL1-3U can lower the apparent viscosity obviously,so the fluidity of the grout is enhanced.