Loading a matrix with nano-sized particles such as nanotubes (carbon or tungsten di-sulfi de) is expected to improve the mechanical properties of composite materials better than traditional (macroscopic) fi llers due to extraordinary mechanical properties accompanied by high surface area. One of the major challenges towards achieving this goal is an effective dispersion of the as-produced aggregated nanotubes. In this work we demonstrate a novel dispersion method, facilitating the integration of individual nanotubes in cement paste matrix. We demonstrate the effectiveness of our nanotubes dispersion method by enhancing both fl exural strength and compressive strength of cement paste using carbon and tungsten di-sulfi de nanotubes. Finally, a comprehensive fractography study indicates that both types of nanotubes fail via pull-out mechanism with an intermediate state of bridging mechanism.
|Title of host publication
|Nanotechnology in Construction
|Published - 22 May 2015