Analysis of the Behavior of Carbon Nanotubes on Cementitious Composites

Table 3

Compressive strength.

Age	Parameters	CN0	CN2	CN4	CN6	Average
3 days	Average 𝜎cp (MPa)	22,67	23,94	29,82	23,18	24,91
	Standard deviation	3,86470	2,04571	0,77571	0,67870
	Variance	14,93590	4,18493	0,60173	0,40630
	% gain/(reduction)	—	5,60	31,53	2,25
7 days	Average 𝜎cp (MPa)	26,27	27,63	37,19	25,54	29,16
	Standard deviation	1,27186	2,61608	1,44777	1,75249
	Variance	1,61763	6,84390	2,09603	3,07123
	% gain/(reduction)	—	5,16	41,54	(2,77)
28 days	Average 𝜎cp (MPa)	30,25	30,93	39,90	26,74	31,96
	Standard deviation	1,26811	2,09724	0,98148	0,82018
	Variance	1,60810	4,39843	0,96330	0,67270
	% gain/(reduction)	—	6,21	31,90	(8,29)
Average		26,40	27,50	35,64	26,16