纳米二氧化锆对超高性能混凝土力学性能、抗硫酸盐侵蚀和抗碳化性能的影响  

Influence of Nano-zirconia on Mechanical Properties,Sulfate Corrosion Resistance and Carbonization Resistance of Ultra-high Performance Concrete

作　　者：张飞鸿 夏海廷[4] 吴军 郭荣鑫[1,2,3] ZHANG Feihong;XIA Haiting;WU Jun;GUO Rongxin(Faculty of Civil Engineering and Mechanics,Kunming University of Science and Technology,Kunming 650500,China;Yunnan Key Laboratory of Disaster Reduction in Civil Engineering,Kunming 650500,China;International Joint Laboratory for Green Construction and Intelligent Maintenance of Yunnan Province,Kunming 650500,China;Faculty of Civil Aviation and Aeronautics,Kunming University of Science and Technology,Kunming,650500,China)

机构地区：[1]昆明理工大学建筑工程学院,昆明650500 [2]云南省土木工程防灾重点实验室,昆明650500 [3]云南省绿色建造与智慧运维国际联合实验室,昆明650500 [4]昆明理工大学民航与航空学院,昆明650500

出　　处：《材料导报》2024年第S02期179-186,共8页Materials Reports

摘　　要：超高性能混凝土(UHPC)因优异的力学性能和耐久性而成为工程领域中的研究热门材料,纳米材料的引入则进一步优化了UHPC的性能。本研究选用了六种不同掺量(0%、1%、2%、3%、4%、5%)的纳米二氧化锆(NZ)替代水泥,系统地研究了NZ对UHPC抗压强度、抗折强度以及耐久性(包括抗硫酸盐侵蚀和抗碳化性能)的影响。实验结果表明,随着NZ掺量的增加,UHPC的抗压和抗折强度都呈先提高后降低的趋势,其中3%NZ掺量的UHPC的力学性能最优异,标准养护28 d后的抗压强度和抗折强度分别比对照组高19.5%和20.8%。耐久性实验显示,掺入NZ的UHPC在硫酸盐侵蚀和碳化环境下均表现出更好的性能,3%NZ掺量的UHPC具有最佳的耐久性,在硫酸盐侵蚀90次循环后,抗压强度最高,为131.3 MPa,质量的损失率最低,为0.13%。通过X射线衍射(XRD)和扫描电子显微镜(SEM)分析机理,NZ颗粒能够减小氢氧化钙(CH)晶体的尺寸和取向,促进水化硅酸钙凝胶(C-S-H)的生成,从而改善UHPC的微观结构。结果表明,确定3%为NZ在UHPC中的最佳掺量。本研究为促进NZ在UHPC中的应用提供指导。Ultra-high performance concrete(UHPC)has become a hot research material in the engineering field because of its excellent mechanical properties and durability,and the introduction of nanomaterials has further optimized the performance of UHPC.In this study,six kinds of nano-zirconia(NZ)with different content(0%,1%,2%,3%,4%,5%)were selected to replace cement,and the effects of NZ on the compressive strength,flexure strength and durability(including the resistance to sulfate attack and carbonization)of UHPC were systematically studied.The experimental results showed that with the increase of NZ content,the compressive strength and flexural strength of UHPC increased first and then decreased,and the mechanical properties of UHPC with 3%NZ content were the best,and the compressive strength and flexural strength of UHPC after 28 d of standard curing were increased by 19.5%and 20.8%,respectively,compared with the control group.Durability experiments show that UHPC mixed with NZ exhibits better performance under sulphate attack and carbonization environment.UHPC mixed with 3%NZ has the best durability.After 90 cycles of sulphate attack,the compressive strength is the highest,131.3 MPa,and the mass loss rate is the lowest,0.13%.Through X-ray diffraction(XRD)and scanning electron microscopy(SEM)analysis mechanism,NZ particles can reduce the size and orientation of calcium hydroxide(CH)crystals,promote the formation of calcium silicate hydrate gel(C-S-H),and improve the microstructure of UHPC.The results show that 3%is the best content of NZ in UHPC.This study provides guidance for promoting the application of NZ in UHPC.

关 键 词：纳米二氧化锆 超高性能混凝土 力学性能 抗硫酸盐侵蚀 抗碳化 微观结构 

分 类 号：TU502[建筑科学—建筑技术科学]