Table 9.

Results of determining the strength characteristics of high-strength concretes.

Num	Coded Factor Values				Natural Values Factor				$$R_{b,cub}$$	$$R_b$$	$$R_{btb}$$	$$R_{bt}$$
	X1	X2	X3	X4	X1	X2	X3	X4
1	−1	−1	−1	−1	3	0.7	2	0.31	71.7	52.8	8.5	5.7
2	1	−1	−1	−1	5	0.7	2	0.31	77.3	57.1	9.7	5.9
3	−1	1	−1	−1	3	2.1	2	0.31	70.5	53.8	8.4	4.9
4	1	1	−1	−1	5	2.1	2	0.31	78.1	58.5	9.6	5.6
5	−1	−1	1	−1	3	0.7	4	0.31	72.8	55.6	8.3	5.0
6	1	−1	1	−1	5	0.7	4	0.31	79.6	52.1	8.8	5.6
7	−1	1	1	−1	3	2.1	4	0.31	70.8	54.1	8.5	5.3
8	1	1	1	−1	5	2.1	4	0.31	77.8	58.3	8.7	5.6
9	−1	−1	−1	1	3	0.7	2	0.35	72.4	55.3	8.5	5.3
10	1	−1	−1	1	5	0.7	2	0.35	69.8	52.4	8.9	4.9
11	−1	1	−1	1	3	2.1	2	0.35	68.7	51.5	8.8	4.8
12	1	1	−1	1	5	2.1	2	0.35	71.9	54.9	8.5	5.5
13	−1	−1	1	1	3	0.7	4	0.35	68.8	51.6	8.4	4.8
14	1	−1	1	1	5	0.7	4	0.35	71.3	53.5	9.2	5.0
15	−1	1	1	1	3	2.1	4	0.35	72.3	54.2	8.2	5.1
16	1	1	1	1	5	2.1	4	0.35	74.8	56.4	8.7	5.2
17	−2	0	0	0	2.5	1.4	3	0.33	67.0	52.3	9.9	4.7
18	2	0	0	0	5.5	1.4	3	0.33	76.9	57.7	9.1	5.4
19	0	−2	0	0	4	0.4	3	0.33	68.7	50.5	8.8	4.8
20	0	2	0	0	4	2.4	3	0.33	72.3	54.2	8.4	5.1
21	0	0	−2	0	4	1.4	1.5	0.33	82.1	61.6	11.8	5.7
22	0	0	2	0	4	1.4	4.5	0.33	75.8	58.9	11.6	5.3
23	0	0	0	−2	4	1.4	3	0.30	73.6	55.2	11.7	5.2
24	0	0	0	2	4	1.4	3	0.36	69.8	52.4	11.4	4.9
25	0	0	0	0	4	1.4	3	0.33	97.8	73.4	11.8	7.2
26	0	0	0	0	4	1.4	3	0.33	95.7	71.4	11.9	7.2
27	0	0	0	0	4	1.4	3	0.33	96.4	72.3	11.5	7.3
28	0	0	0	0	4	1.4	3	0.33	94.8	70.5	11.4	7.4
29	0	0	0	0	4	1.4	3	0.33	97.6	73.2	11.7	7.3
30	0	0	0	0	4	1.4	3	0.33	98.4	73.8	11.8	7.2
31	0	0	0	0	4	1.4	3	0.33	95.1	72.3	11.4	7.1