碳纤维/纳米碳黑水泥基材料力学性能与微观结构对比研究
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(1 武夷学院，武夷山 354300；2 汕头大学，汕头 515063；3 石家庄铁路职业技术学院，石家庄 050041)[摘要] 对单掺和混掺纳米碳黑（Nanometer Carbon Black，NCB）、碳纤维（Carbon Fiber，CF）的水泥基复合材料的力学性能进行了试验对比，发现适量掺入纳米碳黑可以明显提高水泥基复合材料的抗折和抗压强度，并且效果比单独掺入碳纤维和混掺纳米碳黑和碳纤维更为明显。借助扫描电子显微镜和压汞试验对水泥基复合材料微观结构和孔隙情况进行了分析。结果表明：纳米碳黑比碳纤维更容易均匀地分散在水泥基材料中，与水泥基材料结合更为紧密，并且纳米碳黑颗粒小于有害孔的孔径，能够有效填充孔隙，进而减小材料的孔隙率和微观缺陷，改善材料的微观结构，使材料结构更加致密。[关键词] 微观分析; 压汞试验; 力学性能; 纳米碳黑; 碳纤维中图分类号：TU522.07 文献标志码：A 文章编号：1002-848X(2013)S2-0584-05基金项目：福建省自然科学基金项目（2012J05096），福建南平市科技项目（N2010Z10（9）），武夷学院青年项目（Xq201018）。作者简介：王玉林，博士，副教授，Email：ylwang513@163.com。Wang Yulin1, Zhao Xiaohua2, Du Jianhua, Wang Jinhua1(1 Wuyi University, Wuyi Shan 354300,China; 2 Shantou University, Shantou 515063,China; 3 Shijiazhuang Railway Vocation Technique College, Shijiazhuang 050041,China)Abstract:The properties of cement-based composites, with nano-sized carbon black and carbon fiber, have been studied by compared experiments. Tests showed that proper addition of nano-sized carbon black can apparently improve both compressive strength and flexural strength, and nano-sized carbon black are more effective in mechanical improvement than carbon fiber only or mix of nano-sized carbon black and carbon fiber. The techniques of scanning electron microscope and mercury injection are adopted to analyze the microstructure and porous condition of cement-based composites. Results show that: nano-sized carbon black is easier to be dispersed into cement matrix and well bonds with the later, what’s more, because of the size nano-sized carbon smaller than that of harmful pores, it can effectively reduce the porosity and microdefects as fillers to improve material microstructure and make material denser.Keywords: micro-analysis; mercury injection experiment; mechanical properties; nano-sized carbon back; carbon fiber
