基于抗氯离子渗透性的复合胶凝材料组成设计与性能  

Composition Design and Properties of Blended Cementitious Material Based on Resistance to Chloride Ingress

作　　者：郭奕群[1] 张同生[1,2] 李嘉豪 幸泽佳 李儒光 韦江雄 余其俊[1,2,3] GUO Yiqun;ZHANG Tongsheng;LI Jiahao;XING Zejia;LI Ruguang;Wei Jiangiong;YU Qjun(School of Materials Science and Engineering,South China University of Technology,Guangzhou 510640,China;Guangdong Low Carbon Technology Engineering Center for Building Materials,Guangzhou 510640,China;College of Civil Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]华南理工大学材料科学与工程学院,广州510640 [2]广东省建筑材料低碳技术工程技术研究中心,广州510640 [3]合肥工业大学土木与水利工程学院,合肥230009

出　　处：《硅酸盐学报》2023年第5期1181-1190,共10页Journal of The Chinese Ceramic Society

基　　金：国家重点研发计划项目(2020YFC1909903);宁夏回族自治区重点研发计划项目(2022BDE02002);国家自然科学基金(52122201)。

摘　　要：通常采用大量掺加辅助性胶凝材料的方式提高胶凝材料的抗Cl^(–)渗透性能,进而提升混凝土结构的耐久性和服役寿命,但会显著降低早期力学性能.为提高早期强度和抗Cl^(–)渗透性能,基于初始浆体密堆积与水化过程孔隙有效填充,设计细、中、粗粒度区间胶凝材料的种类和掺量,提高浆体的初始堆积密度和水化产物固氯能力,从而细化孔径并增大孔隙曲折度,采用59%的水泥熟料(粒径范围4~55μm),成功制备了3 d抗压强度27.3 MPa、28 d Cl^(–)扩散系数低至0.36×10^(–12)m^(2)/s的高抗渗透复合胶凝材料,为水泥基材料微结构调控和抗渗性能提升奠定基础.The chloride resistance of blended cementitious materials can be improved by incorporating a high volume of supplementary cementitious materials(SCMs),thereby improving the durability and service life of concrete structures.However,their mechanical properties decrease significantly,especially at early age.To improve the early-age mechanical properties and chloride resistance,the type and addition of cementitious materials in the fine,mid-size,and coarse fractions were optimized based on particle close-packing and pore fillability during hydration.The blended cement pastes with greater chloride binding capacity and pore tortuosity are obtained due to the pore refinement of fine particles and efficient hydration of both clinker and SCMs.In addition,a blended cementtious material with 3-day compressive strength of 27.3 MPa and 28-day chloride diffusion coefficient of 0.36×10^(-12) m^(2)/s was prepared using only 59%clinker with a size range of 4-55μm.The results provide a deeper insight in the microstructural optimization and durability improvement of cement-based materials.

关 键 词：抗氯离子渗透 复合胶凝材料 颗粒级配 水化产物 氯离子固化 

分 类 号：TU525[建筑科学—建筑技术科学]