欧阳辉玄,王燕锋,赵晓华
散,碳纳米管水泥基复合材料的抗弯性能随着短多壁碳纳米管掺量的增加而增大。王宝民等[14]利用阴离子表面活性剂阿拉伯树胶加超声分散制备得多壁碳纳米管分散溶液,由该分散液制备水泥净浆试件,之后测试碳纳米管水泥净浆的力学性能,试验结果显示:碳纳米管水泥基复合材料抗弯强度明显高于空白试件;微观电镜结果显示,分布在水泥基体内的碳纳米管起到了桥接作用。徐世烺等[15]利用定向多壁碳纳米管来改善高强砂浆的力学性能,试验对定向多壁碳纳米管(A-MWCNTs)的羰基化分散体和水分散体两种分散体增强M140砂浆进行了对比研究。试验结果表明:添加质量分数为0.01%的定向多壁碳纳米管后,A-MWCNTs羰基化分散体M-140砂浆复合材料的抗折、抗压强度分别比相同条件下制得的M140砂浆增加了5.4%和8.4%;而A-MWCNTs水分散体M140砂浆复合材料的抗折强度、抗压强度分别比相同条件下制得的M140砂浆增加了20.7%、15.9%。
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.
工业级碳纳米管增强水泥基材料力学性能试验研究
欧阳辉玄,王燕锋,赵晓华
散,碳纳米管水泥基复合材料的抗弯性能随着短多壁碳纳米管掺量的增加而增大。王宝民等[14]利用阴离子表面活性剂阿拉伯树胶加超声分散制备得多壁碳纳米管分散溶液,由该分散液制备水泥净浆试件,之后测试碳纳米管水泥净浆的力学性能,试验结果显示:碳纳米管水泥基复合材料抗弯强度明显高于空白试件;微观电镜结果显示,分布在水泥基体内的碳纳米管起到了桥接作用。徐世烺等[15]利用定向多壁碳纳米管来改善高强砂浆的力学性能,试验对定向多壁碳纳米管(A-MWCNTs)的羰基化分散体和水分散体两种分散体增强M140砂浆进行了对比研究。试验结果表明:添加质量分数为0.01%的定向多壁碳纳米管后,A-MWCNTs羰基化分散体M-140砂浆复合材料的抗折、抗压强度分别比相同条件下制得的M140砂浆增加了5.4%和8.4%;而A-MWCNTs水分散体M140砂浆复合材料的抗折强度、抗压强度分别比相同条件下制得的M140砂浆增加了20.7%、15.9%。
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.
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.
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