Abstract
Reinforced concrete facades exist since decades exposed to natural weather conditions. Thus nowadays lot of them are damaged by carbonation induced corrosion and therefor require repairing and retrofitting. The aim of this research project is to investigate the possibilities of basalt fibre reinforced concrete as repairing material and also basalt rebars as additional strengthening reinforcement. Investigations with basalt fibre reinforced mortar prisms showed best results in 3 point bending tests, tensile strength and also compressive strength using 0.3 Vol.-% basalt fibres in mixture. The mechanical properties of basalt rebars made of basalt fibre reinforced polymer were tested, showing higher values in tensile strength and Young´s Modulus than comparable steel reinforcement samples. The basalt rebar reinforced concrete samples achieved higher ultimate loads in three-point bending test compared to SRC samples. But after failure in the bonding area no residual load capacity remained. Finally basalt reinforcement bars seems to be well suited for use as retrofitting material for facade elements, but numerous properties have to be examined in further investigations.
Highlights
Many concrete structures in Germany, built in the 50s and 60s, reinforced with traditional steel rebar, are constantly subjected by corrosion attack especially by carbonation
The mechanical properties of basalt fibre reinforced polymer (BFRP) specimen were tested in reference to samples with traditional steel reinforcement (SRC)
It is shown that the bond length and the rebar diameter can influence the mechanical behaviour of BFRP samples [8; 10]
Summary
Many concrete structures in Germany, built in the 50s and 60s, reinforced with traditional steel rebar, are constantly subjected by corrosion attack especially by carbonation. To avoid further corrosion damage after repairing the concrete surfaces alternative reinforcement materials have been investigated. In combination with its high specific strength and high resistance to aggressive media basalt fibres seems to be a good alternative as retrofitting material [1]. The basic idea of this research was to use basalt fibre reinforced polymer (BFRP) rebars as a strengthening material for use in concrete façade elements to be repaired. That deflections of BFRP reinforced concrete beams are significantly higher than deflections of SRC beams [7]. These properties are caused by lower Young’s modulus of the basalt rebars [8; 9]. It is shown that the bond length and the rebar diameter can influence the mechanical behaviour of BFRP samples [8; 10]
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