Strength and deformability of folded elements made of textile-reinforced concrete

Introduction. The behaviour of folded elements made of textile-reinforced concrete under loading is investigated. Textile-reinforced concrete is a relatively new building material that is attracting increasing interest from researchers. Because the elements of textile-reinforced concrete are thin in cross section, they cannot cover large-span buildings. However, textile-reinforced concrete is well suited for the production of folded shells, as in the case of ferrocement. The aim of this study is to investigate the strength of textile-reinforced concrete folds under loading.

Materials and methods. Textile-reinforced concrete folded specimens were manufactured. Warp-knitted meshes made of alkali-resistant glass fibres (AR) and carbon fibres (C) were used to reinforce the elements. The specimens were tested. Based on the test results, a comparison of the fold properties was performed depending on their shape (triangular or trapezoidal) and type of reinforcement.

Results. The average failure load for the triangular folds was 5.9 kN for nonreinforced specimens, 4.8 kN for specimens reinforced with AR rovings, and 3.6 kN for specimens reinforced with C rovings. For the trapezoidal folds, the average failure load was 8.0 kN for nonreinforced specimens, 8.7 kN for AR reinforcement, and 10.7 kN for C reinforcement. The average compressive strength of fine-grain concrete was 25.08 MPa. The flexural strength of the fold elements was 7.29 MPa for nonreinforced specimens, 9.33 MPa for AR-reinforced specimens, and 15.4 MPa for C-reinforced specimens.

Conclusions. The currently existing regulatory framework is insufficient for wide application of textile-reinforced concrete products in construction. To date, there are scattered experimental and theoretical studies on the mechanical properties of the material and the behaviour of structures made of textile-reinforced concrete under loading. Experimental data on the behaviour of folded elements made of textile-reinforced concrete under loading are presented.

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