Study on Mechanical Properties and Optimum Fiber Content for Basalt/Polyacrylonitrile Hybrid Fiber Reinforced Concrete

Table 5

Calculation results of the ratio of toughness.

Symbol	σf (MPa)	D (mm)	Rx
A-1	5.08	5.3	1
A-2	5.17	8.9	1.8
A-3	5.73	9.5	2.5
A-4	6.01	9.2	2.4
P-1	6.16	10.5	2.0
P-2	6.6	13.6	2.7
P-3	6.55	11.9	2.7
H-1	5.82	12.2	3.5
H-2	6.7	14.8	3.7
H-3	6.58	13.1	3.5
H-4	5.95	9.9	3.1
H-5	6.23	10.8	3.6
H-6	6.85	15.3	4.4
H-7	5.73	12.9	2.9
H-8	5.83	10.9	3.2
H-9	5.98	8.3	3.6