氧化石墨烯改性高流动水泥基注浆性能及机理研究  

Study on the performance and mechanism of graphene oxide modified high flowability cementitious grouting

作　　者：廖铖 高江林 胡松涛 黄诗渊 戴国强 LIAO Cheng;GAO Jianglin;HU Songtao;HUANG Shiyuan;DAI Guoqiang(Jiangxi Academy of Water Science and Engineering,Nanchang 330029,China;Jiangxi Hydraulic Safety Engineering Technology Research Center,Nanchang 330029,China;Jiangxi Key Laboratory of Flood and Drought Disaster Defense,Nanchang 330029,China;Jiangxi Provincial Technology Innovation Center for Ecological Water Engineering in Poyang Lake Basin,Nanchang 330029,China;School of Materials Science and Engineering,Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]江西省水利科学院,江西南昌330029 [2]江西省水工安全工程技术研究中心,江西南昌330029 [3]水旱灾害防御江西省重点实验室,江西南昌330029 [4]江西省鄱阳湖流域生态水利技术创新中心,江西南昌330029 [5]重庆交通大学材料科学与工程学院,重庆400074

出　　处：《混凝土》2025年第3期186-192,共7页Concrete

基　　金：国家自然科学基金青年项目(52109113);江西省水利厅科技项目(202325ZDKT16,202325ZDKT23,202324YBKT04,202324YBKT19)。

摘　　要：为提升高流动水泥基注浆材料性能,节约水泥用量,减少能源消耗和碳排放.研究了氧化石墨烯-粉煤灰(GO-FA)协同作用下水泥基浆体流动性、抗折强度、抗压强度、浆液流变性能和微观作用机理.结果表明:当GO掺量为0.03%时浆液流动性仅降低11.6%,28 d的抗压强度和抗折强度分别提升24.1%和22.1%,GO最佳掺量为0.03%;GO水泥基浆液中复掺FA能提高浆液的流动度,FA掺量为20%时抗压强度最高为25.84 MPa.GO-FA浆液具有明显的剪切稀化和经时效应,采用修正宾汉流体模型拟合精度更好.微观研究证实,GO-FA协同效应不会改变水化产物的种类,GO能促进水化反应生成更多的C-S-H胶凝产物,同时激活FA的活性发生火山灰效应,二次水化产物在微裂纹和空隙中生长,使结构更加致密,从而增强结石体的宏观力学强度。In order to enhance the performance of high-flow cement-based grouting materials,save cement consumption,and reduce energy consumption and carbon emission.Graphene oxide-fly ash(GO-FA)synergized cement-based slurry fluidity,flexural strength,compressive strength,slurry rheological properties and microscopic action mechanism were investigated.The results showed that when the GO doping was 0.03%the slurry fluidity was only reduced by 11.6%,and the compressive and flexural strengths at 28 d were enhanced by 24.1%and 22.1%,respectively,and the optimal doping level of GO was 0.03%;the compounding of FA in the GO cement-based slurry improved the slurry fluidity,and the highest compressive strength of 25.84 MPa was achieved at a doping level of FA of 20%.The GO-FA slurry had a obvious shear thinning and warp time effects,and the fitting accuracy is better using the modified Bingham fluid model.The microscopic study confirms that the GO-FA synergistic effect does not change the type of hydration products,and GO can promote the hydration reaction to generate more C-S-H cementation products,while activating the activity of FA to occur volcanic ash effect,the secondary hydration products grow in the microcracks and voids,so as to make the structure denser,thus enhancing the macroscopic mechanical strength of the stone body.

关 键 词：高流动注浆材料 氧化石墨烯-粉煤灰 协同作用 力学性能 微观机理 

分 类 号：TU528.01[建筑科学—建筑技术科学]