Research Article
Cement Pastes and Mortars Containing Nitrogen-Doped and Oxygen-Functionalized Multiwalled Carbon Nanotubes
Figure 12
Mechanical resistance (compressive strength) tests performed during the mortar hydration process for mortar containing ordinary Portland cement (OPC), sand, and carbon nanotubes. The water acidity (pH value) and the dispersion time () are varied. The results are for mortars without carbon nanotubes, mortars with MWCNT-Nx, mortars with MWCNT-Ox, and mortars with MWCNT-(Nx + Ox). All of the tests were performed in cylindrical samples with a height of 10 cm and a diameter of 5 cm; each of the samples was exposed to forces perpendicular to the cylinder base until the sample broke.
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