Mechanical and Morphological Properties of Highly Dispersed Carbon Nanotubes Reinforced Cement Based Materials  

作　　者：王宝民 HAN Yu PAN Baofeng ZHANG Tingting 

机构地区：[1]Institute of Building Materials, Dalian University of Technology [2]Institute of Road Engineering, Dalian University of Technology [3]Department of Civil and Environmental Engineering, Imperial College London

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2013年第1期82-87,共6页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Natural Science Foundation of China(Nos.51278086,51178085);the Program for New Century Excellent Talentsin University(NCET);the State Key Laboratory of Coastal and Offshore Engineering(No.LP1109);the Fundamental Research Funds for the Central Universities(No.DUT11NY11)

摘　　要：Stable homogeneous suspensions of multi-walled carbon nanotubes （MWCNTs） were prepared using gum arabic （GA） as dispersant and were incorporated to Portland cement paste. The dispersion was examined by ultraviolet visible spectroscopy （UV-vis）, and the concentration measurement shows that the optimum concentration of GA is 0.45 g · L^-1. The dispersibility of the surface-modified MWCNTs in aqueous solution and cement matrix were investigated by transmission electron microscopy （TEM） and energy dispersive spectroscopy （EDS）, and the mechanical properties of the composites were investigated. The results show that the addition of the treated nanotubes can improve both the flexural strength and the compressive strength of the Portland cement composite significantly. The flexural strength of the composite increases up to 43.38% with the MWCNT concentration of 0.08% （by weight of cement）. The porosity and pore size distribution of the composites were measured by mercury intrusion porosimetry （MIP）, and the results indicate that the cement paste doped with MWCNTs obtained lower porosity and concentrated pore size distribution. The morphological structure was analyzed by field emission scanning electron microscopy （FESEM） and EDS. It is shown that MWCNTs act as bridges and networks across cracks and voids, which transfer the load in case of tension, and the interface bond strength between the nanotubes and matrix is very strong.Stable homogeneous suspensions of multi-walled carbon nanotubes （MWCNTs） were prepared using gum arabic （GA） as dispersant and were incorporated to Portland cement paste. The dispersion was examined by ultraviolet visible spectroscopy （UV-vis）, and the concentration measurement shows that the optimum concentration of GA is 0.45 g · L^-1. The dispersibility of the surface-modified MWCNTs in aqueous solution and cement matrix were investigated by transmission electron microscopy （TEM） and energy dispersive spectroscopy （EDS）, and the mechanical properties of the composites were investigated. The results show that the addition of the treated nanotubes can improve both the flexural strength and the compressive strength of the Portland cement composite significantly. The flexural strength of the composite increases up to 43.38% with the MWCNT concentration of 0.08% （by weight of cement）. The porosity and pore size distribution of the composites were measured by mercury intrusion porosimetry （MIP）, and the results indicate that the cement paste doped with MWCNTs obtained lower porosity and concentrated pore size distribution. The morphological structure was analyzed by field emission scanning electron microscopy （FESEM） and EDS. It is shown that MWCNTs act as bridges and networks across cracks and voids, which transfer the load in case of tension, and the interface bond strength between the nanotubes and matrix is very strong.

关 键 词：carbon nanotubes Portland cement DISPERSIBILITY REINFORCEMENT morphological properties 

分 类 号：TU528[建筑科学—建筑技术科学]