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 5

Definition of factors and responses in the process of multiobjective optimization.

Factors and responses	Goal	Lower limit	Upper limit	Importance
PPF content (%)	In the range	1.5	2.5
FA content (%)	In the range	45	75
CB content (%)	In the range	0.3	1.1
Flexural strength (MPa)	Maximum	7.07	15.41	5
Compressive strength (MPa)	Maximum	23.93	71.74	5
Flexural-compressive strength (%)	Maximum	13.99	35.29	5
Splitting tensile strength (MPa)	Maximum	4.41	10.18	5