水泥基补浆料与钢筋套筒灌浆料相关性能对比研究  

Comparative Study on Relevant Properties of Cementitious Repairing Grouting Material and Rebar Sleeve Grouting Material

作　　者：胡志刚[1] 李威 王长军[1] 宋涛文[2] 丁小平 韩宇栋[2] HU Zhigang;LI Wei;WANG Changjun;SONG Taowen;DING Xiaoping;HAN Yudong(Beijing Building Research Institute Co.,Ltd.of CSCEC,Beijing 100076,China;Central Research Institute of Building and Construction,Co.,Ltd.,MCC Group,Beijing 100088,China)

机构地区：[1]北京中建建筑科学研究院有限公司,北京100076 [2]中冶建筑研究总院有限公司,北京100088

出　　处：《工业建筑》2022年第8期201-207,共7页Industrial Construction

基　　金：中建股份科技研发计划资助课题(CSCEC-2019-Z-4);北京市科技新星计划(Z201100006820024);中冶建筑研究总院有限公司重大课题(YCK2017Ky01)。

摘　　要：钢筋套筒灌浆连接常因灌浆料流动性不良等原因发生灌浆不密实,需进行科学修补。为改进当前钢筋套筒灌浆修补中的不足,本研究开发了一种水泥基补浆料,并开展了其与普通套筒灌浆料的相关性能对比研究。结果表明:水泥基补浆料28 d抗压强度为96.4 MPa, 24 h与3 h的竖向膨胀率差值为0.23,满足JG/T 408—2019《钢筋连接用套筒灌浆料》的性能标准指标要求。水泥基补浆料截锥流动度和流锥流动度及其30 min保留值均明显优于普通套筒灌浆料。压汞试验和纳米压痕数据聚类分析结果表明:相比于普通灌浆料,补浆料28 d孔隙结构更细,水泥浆体各相硬度和弹性模量更高。现场应用表明补浆料可灌性优势明显,可用于对钢筋套筒普通灌浆料灌浆不密实的修补施工。The rebar sleeve grouting connection is often incompletely filled due to unsatisfactory fluidity of grouting material, which needs to be repaired properly. To improve the workability and quality of the grouting repairing construction, a cementitious repairing grouting material(CRGM) was first prepared, then the relevant properties of CRGM and ordinary rebar sleeve grouting material(ORSGM) were experimentally compared. The results showed that the 28 d compressive strength of present CRGM was 96.4 MPa, and early-age vertical expansion rate from 3 h to 24 h was 0.23, which both could meet the index requirements of ORSGM in Cementitious Grout for Sleeve of Rebar Splicing(JG/T 408—2019). Truncated cone fluidity, flow cone fluidity and their 30 minutes retention values of CRGM were obviously much better than that of ORSGM. Comparing with ORSGM at the age of 28 days, the mercury intrusion testing results and cluster analysis of nano-indentation data indicated that the pore structure of CRGM was finer, and the hardness and elastic modulus of the hardened cement paste were higher. The field application also showed that the CRGM had an obvious advantage in groutability, and could be used for repairing construction of the not-full-filled grouting of the reinforcement sleeve grouting connection in the future.

关 键 词：水泥基补浆料 钢筋套筒灌浆料 流动度 竖向膨胀率 可灌性 

分 类 号：TU578[建筑科学—建筑技术科学]