工业级碳纳米管增强水泥基材料力学性能试验研究
Experimental Study on Mechanical Performance of Industrial Level Carbon Nonatubes Reinforced Cement-based Materials
关键词：
碳纳米管；水泥基材料；抗压强度；抗折强度；孔隙
Key words：
碳纳米管；水泥基材料；抗压强度；抗折强度；孔隙Carbon nanotubes; Cement-based materials; Compressive strength; Flexural strength; Porosity
刊期：
２０18年第8期
DOI：
文章编号：
1000-4637（2018）08-10-05
基金项目：
广东省高等教育重点实验室基金（2013CXZDA 017）
作者：
欧阳辉玄，王燕锋，赵晓华
单位：
汕头大学工学院土木工程系，515000
摘要
摘 要：通过表面活性剂聚乙烯吡咯烷酮和超声作用，将工业级碳纳米管分散在水溶液中，制备了碳纳米管水泥净浆和碳纳米管水泥砂浆，标准养护28 d后测试其力学性能。试验结果显示，工业级碳纳米管在掺量为水泥质量分数的0.05%、0.1%、0.5%时，水泥净浆抗折强度分别提高：2.503%、-21.808%、-12.302%；抗压强度分别提高：11.966%、13.039%、10.866%。 同样掺量的碳纳米管，水泥砂浆的抗折强度提高幅值分别为：17.16%、7.07%、3.72%；水泥砂浆的抗压强度提高幅值为：8.07%、2.61%、-5.24%。SEM结果表明，适量分散良好的工业级碳纳米管在水泥基体内呈桥接状分布，随着掺量的增加，团聚作用明显，碳纳米管呈现出簇拥现象。压汞试验结果显示，在水泥基材料内适量添加工业级碳纳米管，水泥基材料的孔隙率降低，有害孔的数量减小，水泥基材料内部孔隙结构得到改善。
Abstract: Polyvinyl pyrrolidone was used as dispersant to disperse the industrial level carbon nonatubes (IL-CNTs) in aqueous solution under the action of ultrasound. And then the homo-dispersed cement/CNTs composites are prepared. The mechanical properties of these composites were investigated at age of 28 day. The results show that the 28d flexural and compressive strengths increased by 2.503% and 11.966% with the IL-CNTs content is 0.05% by weight of cement. However, as the proportion of IL-CNTs is increased from 0.1% to 0.5% by weight of cement, the flexural strength of the paste decreases by 21.808%,12.302%, the compressive strength of the paste increases by 13.039%, 10.866%. For the case of the mortar in the same ratio of IL-CNTs, the flexural and compressive strength increase by 17.16%, 7.07%, 3.72% and 8.07%,2.61%,-5.24%, respectively. SEM analysis shows that proper addition of IL-CNTs makes the bridging between the CNTs and the matrix. They will agglomerate when the amount of admixture is increased. The results of MIP show that with the proper addition of industrial carbon nanotubes in the cement-based materials, the porosity of the cement-based materials is reduced, the number of harmful pores is reduced, and the internal pore structure of the cement-based materials is improved.
结论
（1）工业级碳纳米管在掺量为水泥质量分数的0.05%、0.1%、0.5%时，水泥净浆抗折强度分别提高2.503%、-21.808%和-12.302%；抗压强度分别提高11.966%、13.039%和10.866%。 同样掺量的碳纳米管，水泥砂浆的抗折强度提高幅值分别为17.16%、7.07%和3.72%；水泥砂浆的抗压强度提高幅值为8.07%、2.61%和-5.24%。
（2）SEM分析显示，适量地掺入工业级碳纳米管分散较好，它们在水泥基体内起到“桥接”作用；当掺量较大时，碳纳米管团聚明显，它们在水泥基内呈“族拥”状分布，降低了水泥净浆的抗折强度。
（3）压汞试验的结果显示，碳纳米管的掺量增加，碳纳米管复合水泥基材料的孔隙率降低，水泥基体内部孔隙的分布得到改善，有害孔减小，碳纳米管水泥基材料抗压强度提高。
（4）适量掺入分散良好的工业级碳纳米管，水泥基体复合材料的力学性能提高，且工程造价低。
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引用本文
欧阳辉玄,王燕锋,赵晓华.工业级碳纳米管增强水泥基材料力学性能试验研究[J].混凝土与水泥制品,2018(8):10-14.
OUYANG H X,WANG Y F,ZHAO X H.Experimental Study on Mechanical Performance of Industrial Level Carbon Nonatubes Reinforced Cement-based Materials[J].China Concrete and Cement Products,2018(8):10-14.
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