A Statistical Approach to Optimizing Concrete Mixture Design

Table 4

Compressive strength test results.

Mix number	28-day average compressive strength, 𝑓^′𝑐 (MPa)	Standard deviation of three replicates of each mixture (MPa)
1	39.7	1.9
2	38.8	1.0
3	39.1	0.8
4	34.1	1.2
5	38.2	1.9
6	40.6	2.0
7	34.2	1.1
8	39.3	1.1
9	39.8	1.6
10	27.9	1.1
11	37.4	1.8
12	38.5	1.1
13	31.9	0.8
14	37.1	1.3
15	33.9	0.2
16	26.5	1.4
17	30.7	1.7
18	36.5	1.6
19	30.0	1.5
20	32.1	1.3
21	30.5	0.8
22	20.7	1.8
23	27.5	0.8
24	29.9	0.3
25	25.4	1.1
26	31.0	0.2
27	25.3	0.2