Effects of Single and Hybrid Steel Fiber Lengths and Fiber Contents on the Mechanical Properties of High-Strength Fiber-Reinforced Concrete

Table 5

Comparison of the test results and prediction of the elastic modulus.

Source	Equation	Range of compressive strengths
			Mean	S.D.	C.O.V
ACI 318-11		—	1.38	1.16	0.84
ACI 363			1.13	0.82	0.73
Graybeal			1.13	0.95	0.84
Kakizaki			1.07	0.90	0.84
This study			0.99	0.83	0.84