Optimal Mix Design and Mechanical Properties of Rapid-Hardening Foam Concrete

Table 4

Orthogonal experiment, each group with three specimens, 1-day compressive strength error percentage.

Test number	Specimen 1 Compressive strength (MPa)	Specimen 2 Compressive strength (MPa)	Specimen 3 Compressive strength (MPa)	Average compressive strength (MPa)	Percentage of error between specimen 1 and average (%)	Percentage of error between specimen 2 and average (%)	Percentage of error between specimen 3 and average (%)
1	1.8177	1.6437	1.6548	1.7054	6.6	3.6	3.0
2	2.5411	2.7990	2.3011	2.5471	0.2	9.9	9.7
3	2.2969	2.2929	1.9991	2.1963	4.5	4.4	9.0
4	0.8513	0.8531	0.8504	0.8510	0.0	0.2	0.0
5	0.2314	0.4581	0.4159	0.3685	37	24%	13
6	0.8781	0.8865	0.8960	0.8869	0.9	0.0	1.0
7	0.1120	0.1416	0.2397	0.1645	32	14	46
8	2.0474	1.9692	1.8988	1.9718	3.8	0.1	3.7
9	1.9687	1.9687	2.1232	2.0202	2.5	2.5	5.1