Nanostructured Cement-Based Materials

摘要

Cement-based materials that have been suitably nanostructured by the use of admixtures are attractive for some structural and functional properties.The admixtures include silica fume(0.1-0.2 μm),carbon black(30 nm),carbon nanofiber(0.1 μm diameter)and water-soluble polymer(methylcellulose).Silica fume causes improvement in the vibration reduction ability(increasing both the damping capacity and the storage modulus),steel-cement shear bond strength,embedded steel corrosion resistance and carbon microfiber dispersion.Carbon nanofiber is superior to carbon microfiber in providing electromagnetic interference shielding,due to the skin effect.At the same content,both carbon nanofiber and carbon black are inferior to carbon microfiber in providing mechanical performance,electrical conductivity and electricalresistance-based strain sensing.However,carbon black lowers the cost and increases the maximum feasible content of conductive admixture,due to enhanced workability.At the same content,methylcellulose is more effective than latex particles in improving the steel-cement bond strength.