无碱早高强速凝剂的制备及其性能研究  

Research on the preparation of alkali-free early and high-strength accelerator and its performance

作　　者：於成龙 元强[2] 田义 薛凯伟 董武 YU Chenglong;YUAN Qiang;TIAN Yi;XUE Kaiwei;DONG Wu(College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;School of Civil Engineering,Central South University,Changsha 410075,China;Safety Supervision Department of China State Railway Group Co.,Ltd.,Beijing 100844,China)

机构地区：[1]广西大学土木建筑工程学院,南宁530004 [2]中南大学土木工程学院,长沙410075 [3]中国国家铁路集团有限公司安全监督管理局,北京100844

出　　处：《东南大学学报(自然科学版)》2025年第1期109-116,共8页Journal of Southeast University:Natural Science Edition

基　　金：国家自然科学基金资助项目(52378278);中国中铁股份有限公司科技研究开发计划资助项目(2023-重大-08);广西防灾减灾与工程安全重点实验室开放课题基金资助项目(2022ZDK027)。

摘　　要：为实现无碱速凝剂性能的早高强化,调整搅拌速率和搅拌时间制备工艺,采用赖氨酸、磷酸、乙二胺四乙酸3种络合组分与硫酸铝结合形成含铝络合物来提高速凝剂中液相Al^(3+)的含量,同时H^(+)抑制Al^(3+)的水解以达到促凝和早强的效果,制备出一种无碱早高强液体速凝剂。此外,对无碱早高强速凝剂水泥浆体的水化进程、微观结构及耐久性进行测试。结果表明:常温条件下,采用质量分数8%速凝剂,以赖氨酸作为络合组分,在1400 r/min搅拌速率和165 min搅拌时间下速凝剂的促凝、早强效果较好;含赖氨酸的速凝剂(ACL)加速了水泥浆体水化放热速率,形成大量钙矾石(AFt)促进凝结,同时也促进了硅酸三钙(C_(3)S)的水化,使得早期强度显著增加;ACL有利于加速水泥浆体的水化和优化混凝土的孔隙结构,进而提升了混凝土的抗氯离子渗透性和抗冻性。To realize the early and high-strength of the alkali-free accelerator performance,an alkali-free early and high-strength liquid accelerator was prepared.In the preparation process,the stirring rate and stirring time were changed,and in the complexing composition,glutamic acid,phosphoric acid,and Ethylenediamine tet-raacetic acid were selected.The combination of complexing composition and aluminum sulfate to form aluminum-containing complexes can increase the content of Al^(3+)in the liquid phase of the accelerator while in-hibiting the hydrolysis of Al^(3+)to promote setting and early strength.Furthermore,the hydration process,mi-crostructure,and durability of alkali-free early and high-strength accelerator cement pastes were tested.The re-sults show that at room temperature,using a mass fraction 8%accelerator,with glutamic acid as the complex-ing composition,at a stirring rate of 1400 r/min and stirring time of 165 min of the accelerator to promote the effect of setting and early strength is good.Accelerator with lysine(ACL)accelerates the hydration exother-mic rate of cement paste,forming numerous ettringite(AFt),shortening the setting time,and also promotes the hydration of tricalcium silicate(C_(3)S),increasing the early strength.ACL facilitates the hydration of the ce-ment paste and optimizes the pore structure of the concrete,which improves the resistance to chloride ion per-meability and frost resistance of the concrete.

关 键 词：无碱速凝剂 早高强 络合组分 制备工艺 水化 耐久性 

分 类 号：TU528.042[建筑科学—建筑技术科学]