Abstract
Basalt fibres (BF) are increasingly studied in structural applications due to its environmental friendliness and good mechanical properties. Mass production of high-strength concrete (HSC) in Russia is mainly associated with the use of organomineral modifiers of the MB series, containing in their composition microsilica, fly ash, hardening regulator and superplasticizer C-3 in different ratios. In our study we produced HSC specimens (without BF, and with 1 wt.% chopped BF) using the modifier MB10-30, with the dimensions of 100x100x100 mm, 100x100x400 mm, 100x100x400 mm with the artificial crack of 25 mm deep in the middle of the span, and also 100х75х400 mm (75 mm height was taken equal to the height of the section above the crack of the 2nd type of prisms). The compressive strength, the tensile strength at bending, the strength at axial tension, the cracking moment, and also the parameters of fracture mechanics, such as: the critical stress intensity factor and the critical energy release rate, at the curing periods of 7, 14, 28, 60 days, have been determined. We also evaluated the influence of crack in the bend element on the value of the cracking moment. The results showed that the inclusion of BF in MB modifier based HSC resulted in a decrease in the compressive strength, however, significantly enhanced its flexure behavior.
Highlights
Basalt fibres (BF) have recently gained popularity in concrete reinforcing applications due to its chemical resistance, environmental friendliness, thermal resistance and good mechanical characteristics
The aim of the study is to determine the parameters of fracture mechanics, such as the critical stress intensity factor and the critical energy release rate, and to evaluate the influence of crack in the bend element on the value of the cracking moment, of high-strength concrete (HSC) produced with the MB modifier
In the framework of this study we carried out the experimental determination of the compressive strength, the tensile strength at bending, the strength at axial tension and the cracking moment, as well as the characteristics of the crack resistance: the critical stress intensity factor and the critical energy release rate of HSC produced with modifier MB1030C without BF and with 1 wt.% chopped BF
Summary
Basalt fibres (BF) have recently gained popularity in concrete reinforcing applications due to its chemical resistance, environmental friendliness, thermal resistance and good mechanical characteristics. BF reinforced high-strength concrete (HSC) is currently being used in the construction of high-rise buildings, bridges, airport runways and highway pavements. The research has been carried out on some physical and mechanical properties of BF reinforced concrete and HSC. Some researchers [1, 2] revealed that BF can significantly improve the flexural properties of concrete. Kizilkanat et al [4, 5] observed that BF reinforced HSC significantly enhance the splitting tensile strength and the critical stress intensity factor. Kabay [7] established a quite strong relationship between abrasive wear and void content and flexural strength of concretes when adding BF. Experimental study of Jiang et al [8] showed that adding BF in concrete significantly improves the tensile strength, flexural strength and toughness index
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