低速水流作用下水泥净浆缝面溶蚀的试验研究  

Experimental Study on Leaching Behaviour of Cement Paste Crack Surface Under Low Velocity Water Flow

作　　者：高文龙 王少伟 吴佳雯 夏群[2] 胡坤[2] GAO Wen-long;WANG Shao-wei;WU Jia-wen;XIA Qun;HU Kun(School of Environmental Science and Engineering,Changzhou University,Changzhou 213164,China;School of Urban Construction,Changzhou University,Changzhou 213164,China)

机构地区：[1]常州大学环境科学与工程学院,江苏常州213164 [2]常州大学城市建设学院,江苏常州213164

出　　处：《水电能源科学》2025年第1期79-83,共5页Water Resources and Power

基　　金：国家自然科学基金项目(52278240);中国水利水电科学研究院水利部水工程建设与安全重点实验室开放研究基金项目(202206);江苏省研究生科研与实践创新计划项目(SJCX23_1552,SJCX23_1553)。

摘　　要：为探究低速水流作用下水泥净浆缝面流速与加速钙溶蚀效应之间的定量关系,使用1 moL/L NH_4Cl溶液作为溶蚀介质,在0.0、0.3、0.6、1.2、2.4 m/s流速下对水泥净浆单裂缝表面开展静态和动态溶蚀试验,研究缝面溶蚀—冲蚀深度、钙离子溶出量、质量损失率、曲折度、粗糙度和剩余固相钙含量6种评价指标的时变规律,并通过SEM/EDS和XRD进行微观机理解释。结果表明,2.4 m/s范围内的净浆缝面动态溶蚀过程仍满足Fick扩散定律,流动水对缝面无明显冲蚀作用,加速溶蚀效应与流速之间呈负指数函数型增长关系;流动水仅在溶蚀初期会引起缝面曲折度和粗糙度的显著降低,后期几乎无影响;流动水仅加速缝面溶蚀过程,不同流速下的最终缝面剩余固相钙含量相近。In order to investigate the quantitative relationship between the velocity of cement slurry and the effect of accelerated calcium dissolution under the action of low speed water flow,accelerated leaching tests were conducted on the single crack surface of cement paste specimens using 1 mol/L NH4-Cl solution at flow velocities of 0.0,0.3,0.6,1.2,and 2.4 m/s.The evolution tendencies of leaching-erosion depth,calcium ion leaching amount,mass loss rate,tortuosi-ty,roughness and remained solid calcium content on crack surface were studied.The microscopic mechanism was ex-plained by SEM/EDS and XRD.The results show that the dynamic leaching process on the crack surface of cement paste still follows the Fick's diffusion law,and within a velocity of 2.4 m/s,water flow does not produce significant erosion.The leaching rate exhibits a negative exponential increase with flow velocity.Flow water has a significant effect on tortu-osity and roughness of the crack surface in the early stage of leaching,but has almost no effect in the later stage.Flow water only accelerates the leaching process on the crack surface,but under different flow velocities and static leaching,the remained solid calcium content on the surface is similar.

关 键 词：水泥净浆 低速水流 单裂缝缝面 加速溶蚀效应 

分 类 号：TV421[水利工程—水工结构工程]