Revised Rebound Hammer and Pull-Out Test Strength Curves for Fiber-Reinforced Concrete

Table 4

Part of the RN and carbonation depths.

Strength grade	PFRC			CFRC			HFRC
	Carbonation depth (mm)	RN	CS (MPa)	Carbonation depth (mm)	RN	CS (MPa)	Carbonation depth (mm)	RN	CS (MPa)
C25	1.5	30.9	29.0	1.0	29.2	29.8	1.0	30.5	28.2
	0.5	30.9	30.2	1.0	29.5	30.7	1.0	31.4	30.9
C30	1.0	33.4	33.1	2.5	34.3	35.2	1.0	35.2	36.5
	0.5	33.6	34.4	1.5	34.8	33.2	1.0	35.7	36.4
C35	1.5	36.4	39.1	1.0	36.3	40.1	1.5	37.6	41.7
	1.0	36.6	37.8	0.5	36.6	43.2	2.0	37.7	40.6
C40	1.5	38.5	44.3	1.0	40.9	44.1	1.0	40.1	46.3
	0.5	38.5	44.7	0.5	41.3	44.2	1.5	40.4	46.3
C45	1.0	39.6	45.5	1.0	40.2	48.8	1.0	42.2	49.5
	0.5	39.6	47.5	1.0	40.3	49.0	1.0	43.0	51.3
C50	1.0	41.4	51.3	1.5	43.0	54.4	1.0	45.3	53.8
	0.5	41.8	50.7	1.0	43.5	50.2	2.0	45.5	53.2

RN = rebound number; CS = compressive strength.