Table 7.

The compressive strength error analysis between the experiment and proposed formula.

Specimen	${\mathit{f}}_{\mathit{c}}^{’}$ (MPa)	${\mathit{f}}_{\mathit{l}}$ (MPa)	Experiment, ${\mathit{f}}_{\mathit{c}\mathit{c}}^{’}$ (MPa)	Proposed Formula, ${\mathit{f}}_{\mathit{c}\mathit{c}}^{’}$ (MPa)	Error (%)
P08C1	8.99	7.67	32.16	42.11	-3.01
P08C2	8.99	15.33	52.18	53.34	2.23
P15C1	4.88	7.67	21.85	22.45	2.74
P15C2	4.88	15.33	39.39	40.02	1.59
P20C1	3.36	7.67	19.22	19.52	0.02
P20C2	3.36	15.33	35.72	35.69	-0.09
P25C1	1.76	7.67	18.08	16.58	-8.27
P25C2	1.76	15.33	28.09	31.41	8.72
Average absolute error (%)					3.33