INFLUENŢA NANOTUBURILOR DE CARBON - SILICEI ULTRAFINE ASUPRA PROPRIETĂŢILOR MECANICE ALE COMPOZITELOR PE BAZĂ DE CIMENT THE INFLUENCE OF CARBON NANOTUBES/SILICA FUME ON THE MECHANICAL PROPERTIES OF CEMENT-BASED COMPOSITES

The influence of multi-walled carbon nanotubes (MWCNTs) mixed with silica fume (SF) on the mechanical property of cement-based composites was investigated. Results indicate that SF particles have a favorable dispersion effect on MWCNTs and MWCNTs can be dispersed uniformly in cement matrix when mixed with SF particles. MWCNTs mixed with SF can decrease the sample porosity and the amount of harmful pores and delay the formation process of micro cracks in the cement paste, improving the strength of specimens effectively. The compressive strength of the sample filled with 10% SF reaches maximum when the MWCNT addition is 0.15% and the flexural strength of the sample filled with 0.08% MWCNTs and 10% SF reaches maximum, the increase percent of flexural strength and compressive strength is both above 35%, displaying well reinforcement effect of MWCNTs mixed with SF particles on the mechanical properties of cement-based composites.

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