改性木素磺酸盐泵送剂GCL1-3的制备及性能研究

通过研究缓凝高效减水剂GCL1与保水剂、引气剂的配伍性能 ,研制了混凝土泵送剂GCL1- 3。GCL1与保水剂HEC、引气剂复配时 ,改善了水泥净浆的保水性能 ,提高了硬化水泥的早期及后期抗压强度。实验测试了GCL1- 3的水泥净浆流动度、减水率、流动度损失和抗压强度等性能。结果表明 ,当w (水 )∶w(水泥 ) =0 4∶1 0 ,w (GCL1- 3) =0 .5 %时 ,水泥净浆流动度可达2 30mm ,减水率达 18% ,且无离析现象 ;2h内流动度损失仅为 2 4% ,而掺FDN的净浆已经失去流动性 ;w(GCL1- 3) =0 .5 %时 ,水泥净浆硬化 3d、7d、2 8d的抗压强度比分别达 146 %、15 8%与148% ,均高于使用FDN

Development of Modified Lignosulfonate Pumping Admixture GCL1-3 and Study of Its Performances

Concrete pumping admixture GCL1-3 was developed by studying the properties of concrete superplasticizer GCL1 combined with water retaining admixture and air entraining agent.When GCL1 combined with water retaining admixture HEC and air entraining agent,it will further improve the water retaining performance and increase the early stage and long term compressive strength.The influences of GCL1-3 on the flowability of cement paste,water reducing ratio,slump loss,setting time and compressive strength were tested.When w(water)∶ w (cement)=0.4∶1, w (GCL1-3)=0.5%,the flowability of cement paste reached 230 mm,water reducing ratio was 18% and there was no water segregation;the flowability loss after 2 h was only 24 3%,while cement paste blended with FDN had no flowability after 2 h.When w(GCL1-3)=0 5%,the compressive strength ratios of cement paste after being hydrated for 3 days,7 days and 28 days were 146%,158% and 148% respectively.