碳纳米管水性分散体的制备及其对水泥砂浆强度的影响  

Preparation of carbon nanotubes solution and its effects on mechanical properties of cement mortar

作　　者：刘巧玲[1,2] 孙伟[1] 孙波 孙晓波[2] 贾立群[2] 马正先[2] 

机构地区：[1]东南大学材料科学与工程学院,南京211189 [2]山东建筑大学土木工程学院,济南250101 [3]济南市工程质量与安全生产监督站历城分站,济南250101

出　　处：《东南大学学报（自然科学版）》2014年第3期662-667,共6页Journal of Southeast University：Natural Science Edition

基　　金：国家重点基础研究发展计划(973计划)资助项目(2009CB623200);长江学者和创新团队发展计划资助项目(IRT13075)

摘　　要：为了研究碳纳米管及其分散性对水泥砂浆性能的影响,分别采用聚乙烯毗咯烷酮(PVP)和十二烷基磺酸钠(SDBS)两种分散剂制备了不同浓度的碳纳米管水性分散体,探讨了不同碳纳米管水性分散体对水泥砂浆强度及微结构性能的影响.实验结果表明:分散剂对碳纳米管在水中的分散效果影响显著,与SDBS相比,采用PVP为分散剂的碳纳米管水性分散体分散性和稳定性更好;分散性良好的碳纳米管能改善水泥砂浆微结构,提高水泥砂浆的抗压、抗折强度,具有较好的增强效果,当碳纳米管掺量为0.5%时,水泥砂浆28 d抗折强度和抗压强度分别提高了49.4%和40.8%.In order to study the effects of carbon nanotubes（CNTs）and their dispersion on the per-formance of cement mortars,the aqueous dispersions of carbon nanotubes are prepared using polyvi-nylpyrrolidone （PVP）and sodium dodecyl benzene sulfonate （SDBS）as dispersant,respectively, and their influences on the mechanical and microstructural properties of cement mortars are studied. The experimental results show that dispersant can significantly affect the dispersion of carbon nano-tubes in water.Compared with SDBS as dispersant,the CNTs solution with PVP as dispersant has more uniform dispersion and higher stability.In addition,highly dispersed carbon nanotubes can densify paste microstructure and improve cement mortar＆#39;s mechanical properties as well.0.5%addi-tion of CNTs can improve the flexural and compressive strength of cement mortars at 28 d by 49 .4%and 40.8%,respectively.

关 键 词：水泥基材料 碳纳米管 水性分散体 力学性能 微结构 

分 类 号：TU52[建筑科学—建筑技术科学]