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

Table 1

Numbers of the specimens used in the compression strength tests. The pH value, dispersion time of the nanotubes samples, and day of the measurement are indicated.

	⁢pH = 1; ⁢Dispersion time 1 h			⁢pH = 1; ⁢Dispersion time 2 h			⁢pH = 7; ⁢Dispersion time 1 h			⁢pH = 7; ⁢Dispersion time 2 h
Day of measurement	3	14	28	3	14	28	3	14	28	3	14	28
MWCNT-N	5	5	5	5	5	5	5	5	5	5	5	5
MWCNT-O	5	5	5	5	5	5	5	5	5	5	5	5
MWCNT-(N + O)	5	5	5	5	5	5	5	5	5	5	5	5
Total specimens	15	15	15	15	15	15	15	15	15	15	15	15