碳纳米管在超细水泥灌浆料中的应用研究

Application of Carbon Nanotubes in Ultra-Fine Cement Grouts

为改善超细水泥灌浆料的性能,将多壁碳纳米管(MWCNTs)加入超细水泥灌浆料中,测试了其对灌浆料强度、可灌性相关参数,以及灌入混凝土缝隙后黏结效果的影响。结果表明:直径为10~20 nm的MWCNTs在超细水泥灌浆料中的最佳掺量为0.10%(质量分数),此时灌浆料56 d抗折强度、抗压强度、折压比相对于未掺加时分别提高了24.3%、23.4%、7.1%;随MWCNTs掺量增加,灌浆料的流动度降低,黏度增加,需要的灌浆压力增加,即灌浆料的可灌性逐渐降低,但在掺量不高于0.10%(质量分数)时,灌浆料硬化后灌浆区域孔隙率随MWCNTs掺量提高未明显增加,灌浆效果没有明显降低;劈裂抗拉试验结果显示,掺加MWCNTs可使灌浆料与混凝土的黏结性能明显增强。

To improve the performance of ultra-fine cement grouts(UFCG),multi-walled carbon nanotubes(MWCNTs)were added into UFCG.The effects of MWCNTs on the strength and grouting properties of UFCG,as well as the bond effect after MWCNTs being added and poured into concrete gap were tested.The results show that the optimum content of MWCNTs(10~20 nm)in UFCG is 0.10%(mass fraction).At this time,compared with blank group,the 56 d flexural strength,compressive strength,and their ratio of UFCG increase by 24.3%,23.4%and 7.1%,respectively.With the increase of MWCNTs content,the fluidity of UFCG decreases,the viscosity and grouting pressure increase.It means that the grouting property decreases gradually.When the MWCNTs content is no more than 0.10%(mass fraction),the porosity of UFCG is not significantly improved,and the grouting effect is not significantly reduced.The result of splitting tensile test shows that the bond performance of UFCG and concrete is significantly enhanced after adding MWCNTs.