Steel Fibres: Effective Way to Prevent Failure of the Concrete Bonded with FRP Sheets

Table 1

Main characteristics and mix proportions of the experimental specimens.

Specimens	Ties		Beams
Series	I	II	I	II
Notation	T1-C3-F0; T3-Ref-F0	T2-C1-F0.6; T4-Ref-F0.6	B1-nm-C1-F0; B7-nm-Ref-F0; B8-C1-F0	B2-nm-C1-F0.8; B3-Ref-F0.8; B4-Ref-F0.8; B5-C1-F0.8; B6-C1-F0.8
Tensile bar reinforcement	, steel At800		, steel S500 or GFRP
Concrete	Mix I	Mix II	Mix III	Mix IV
Age at the testing, days	124; 107	131; 117	1377–1431	1442–1472
Compressive strength, MPa	55.1	50.0	50.6	31.6
Mixture proportions, kg/m^3:
Sand 0/4 mm
Crushed aggregate 5/8 mm
Crushed aggregate 11/16 mm
Cement CEM I 42.5 N
Water
Concrete plasticizer	,; MC-PowerFlow 1124		,	,
			Stachement 2067	Muraplast FK 63.30
Fibres	—	, DUOLOC	—	, MECHEL NEMUNAS