Sugarcane Bagasse Ash Micronized Using Air Jet Mills for Green Pozzolan in Brazil

Table 3

Axial compressive strength and statistical indicators of mortars.

Specimens by batches and statistical indicators	Compressive strength indices (MPa)
	Mref1	Mref2	Mmf1	Mmf2
CS1	26.5	25.6	34.1	31.2
CS2	27.1	26.5	31.8	34.6
CS3	27.3	29.7	34.2	30.1
CS4	28.4	25.2	31.5	34.0
CS5	26.0	24.8	29.5	29.7
CS6	25.9	24.9	29.4	29.7
Maximum relative deviation (MRD)	4.9	14.3	7.8	7.4
Variance	0.88	3.46	4.53	4.99
Observations	6	6	6	6
Mean	26.5		31.7
Mean variance	2.17		4.76
Null hypothesis (h0)	0		0
Degrees of freedom (DF)	10		10
Stat t	0.88		0.16
P (T ≤ t) one-tailed	0.20		0.44
Critical t one-tailed	1.81		1.81
P (T ≤ t) two-tailed	0.40		0.88
Critical t two-tailed	2.23		2.23