Mechanical Properties of Polypropylene-Fiber-Reinforced High-Performance Concrete Based on the Response Surface Method

Table 5

Level of experimental factors (given in terms of actual and code values).

Symbol	Factors	Actual values			Code values
A	The content of PPF	1%	1.5%	2%	−1	0	1
B	The content of FA	45%	60%	75%	−1	0	1
C	Water/binder ratio	0.27	0.3	0.33	−1	0	1