Research Article

Cement Pastes and Mortars Containing Nitrogen-Doped and Oxygen-Functionalized Multiwalled Carbon Nanotubes

Figure 9

SEM images of the hydrated cement paste with MWCNT-Ox at the initial hours of the hydration process. Carbon nanotubes connecting different hydrated cement grains can be appreciated (see the arrows). Ettringite and calcium hydroxide structures are found to be promoted by the hydration process.
(a) Cement paste with MWCNT-Ox
(b) Cement paste with MWCNT-Ox
(c) Cement paste with MWCNT-Ox
(d) Cement paste with MWCNT-Ox