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Advances in Materials Science and Engineering
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2022
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Article
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Tab 4
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Research Article
Study on Mechanical Performance of ECC Reinforced by Polypropylene Fiber Mixed with Manufactured Sand and Carbon Black (CBMSPP-ECC) Based on Response Surface Method
Table 4
Experimental factors and response results of BBD matrix design.
Mix number
Variable code and level
Response value
Std
A
B
C
R1: flexural strength (MPa)
R2: compressive strength (MPa)
R3: flexural-compressive ratio (%)
R4: splitting tensile strength (MPa)
1
−1
−1
0
8.24
58.89
14.00
8.89
2
1
−1
0
10.62
46.62
22.78
6.43
3
−1
1
0
7.16
37.49
19.11
5.58
4
1
1
0
11.05
32.95
33.53
5.32
5
−1
0
−1
8.90
29.61
30.05
4.73
6
1
0
−1
10.13
38.10
26.57
5.57
7
−1
0
1
10.73
70.78
15.15
9.01
8
1
0
1
15.41
71.75
21.48
8.99
9
0
−1
−1
7.07
48.04
14.72
6.90
10
0
1
−1
8.45
23.93
35.29
4.41
11
0
−1
1
11.70
67.86
17.25
10.18
12
0
1
1
12.04
52.80
22.80
5.92
13
0
0
0
12.81
70.21
18.25
7.05
14
0
0
0
13.23
69.79
18.96
6.85
15
0
0
0
13.08
63.98
20.44
9.30
16
0
0
0
12.73
69.34
18.36
7.64
17
0
0
0
10.87
68.69
15.82
7.23