Abstract
The paper presents the study on bond behaviour of steel bars. It reports the research conducted on local bond strength of short length specimens in high performance concrete (HPC) and basalt fibre reinforced high performance concrete (BFRHPC). In this study, the basalt fibre volume content, concrete cover, bar diameter and rib geometry are the main parameters. Further important factors are the directions of the casting and loading. Determining the effect of aforementioned main parameters on the bond strength in test series is required, in order to design reinforced HPC structures. The study of local bond strength in HPC and BFRHPC with five different basalt fibre fractions included tests of seventy-two short length specimens, using two concrete cover and two diameters of steel bars with different rib face angles. For different ranges of BFRHPC strength, relationships for bond strength with respect to the splitting tensile strength were obtained. The bond strength increased with the splitting tensile strength and compressive strength of BFRHPC specimens with the 12 mm and 16 mm bar respectively. The bond strength of BFRHPC was lower for the bar with the greater distances between the lugs on the bar.
Highlights
High performance concrete (HPC) has compressive strength above 80 MPa and low permeability.A serious disadvantage of this composite is brittleness, which increases with strength
The results indicate that the basalt fibre volume content influenced the compressive strength in fibre content range considered from 0% to 2%
The given relationships were proposed for basalt fibre content between 0% and 1.5%, due to problems with proper fibre distribution at 1.75% and 2% fibre volume contents, which resulted in a significant reduction of 18.8% in splitting tensile strength of basalt fibre reinforced high performance concrete (BFRHPC)
Summary
High performance concrete (HPC) has compressive strength above 80 MPa and low permeability.A serious disadvantage of this composite is brittleness, which increases with strength. High performance concrete (HPC) has compressive strength above 80 MPa and low permeability. Can reduce the brittleness of HPC and significantly improve its tensile strength and fracture toughness, as well as its ductility. Basalt fibres produced from molten basalt rock have very good strength properties, as well as high resistance to fire and alkaline environment, and at the same time are relatively cheap. These characteristics determine their use in concrete [11,12]. The above-mentioned characteristics and an environmentally friendly manufacturing process [14] might determine their application in HPC structures, instead of the most commonly used steel and polypropylene fibres
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