Effect of Bacillus cohnii on Some Physicomechanical and Microstructural Properties of Ordinary Portland Cement

Table 4

Results for Bacillus cohnii percentage gain in compressive strength of mortars.

Curing age (days)	Percent compressive strength gain (mean ± SE) %
	OPC-H2O-BC	OPC-BC-H2O	OPC-BC-BC
14	1.13 ± 0.22^a	3.39 ± 0.26^a	5.61 ± 0.17^a
28	5.42 ± 0.17^b	9.47 ± 0.10^b	12.88 ± 0.12^b
56	8.05 ± 0.16^b	11.92 ± 0.01^b	15.06 ± 0.13^b
90	20.25 ± 0.03^c	24.49 ± 0.20^c	28.29 ± 0.14^c
value	<0.001	<0.001	<0.001

Mean values followed by same small letters within the same column do not differ significantly from one another (one-way ANOVA, α = 0.05, SNK-test).