Abstract
Adding different fiber types may yield improvement of steel fiber reinforced concrete (SFRC) features. Therefore, the investigation of hybrid fiber reinforced concrete (HFRC) mechanical properties is relevant. The effect of adding hybrid steel and basalt fiber on the mechanical properties of fine-grained concrete is studied. It is shown that hybrid fiber reinforcement using optimal steel and basalt fiber ratio allows preventing concrete mixtures' segregation and improving their structure homogeneity. This, in turn, allows achieving higher concrete strength values. In most cases, the design of such concrete compositions is based on engineering experience that limits the designers' capabilities. Therefore, an effective methodology for proper HFRC composition design should be developed. The present study is focused on developing such a methodology. The developed methodology includes using the mathematical experiments planning method to design optimal composition of high-strength fine-grained fiber reinforced concrete with hybrid steel and basalt fiber reinforcement. It is demonstrated that the proposed method can be effectively used for the design of optimal compositions of HFRC.
Highlights
Using steel fiber-reinforced high-strength concrete (SFRHSC) is very popular in structural engineering
The cost analysis of using basalt fiber (BF) in concrete indicates that it is cheaper than using steel fiber as well as s-glass and carbon ones
A more detailed study was performed to investigate the effect of cement consumption, water-cement ratio, as well as SF and BF content and volume ratio on strength characteristics of fine-grained hybrid fiber reinforced concrete (HFRC)
Summary
Using steel fiber-reinforced high-strength concrete (SFRHSC) is very popular in structural engineering. Many studies are conducted to investigate its properties and develop new SFRHSC design methods to provide ductile behavior, limit cracks' development, and propagate in SFRHSC elements [1,2,3,4]. The effect of basalt fiber (BF) on concrete mechanical properties was investigated [5,6,7]. It is found that BF production lines could be arranged at low capital costs for any business needs [5]. Experimental results show that the inclusion of BF even at low contents increases flexural strength [6,7]. The cost analysis of using BF in concrete indicates that it is cheaper than using steel fiber as well as s-glass and carbon ones
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