PSI - Issue 59

Volodymyr Dovbenko et al. / Procedia Structural Integrity 59 (2024) 702–709 Volodymyr Dovbenko et al./ Structural Integrity Procedia 00 (2019) 000 – 000

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3. Research results and discussion Cubes and prisms of all series were tested under a one-time, short-term load regime until failure. The general view of the destruction of the prism is shown in Fig. 3a,b.

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Fig. 3. General view of the destruction of prisms by central compression: (a) controlled; (b) reinforced.

The average cubic strength of the control concrete for the samples of the first series was fc, cube = 19.9 МPа, prism strength was fc, prism = 17.8 МPа. The average strength values of the reinforced concrete for cube samples and prism samples were fc, cube = 23.2 МPа and fc, prism = 21.5 МPа, respectively. Reinforcement with the composition increased the cube strength of concrete by 16.7% and by 20.9% – prism strength. For the second series, the test results of three samples showed strength for cubes f c, cube = 30.2 М P а and for prisms – f c, prism = 27.8 М P а . According to the results of testing the prisms for axial compression, the maximum concrete deformati ons were ε c = 178. 4 × 10 -5 . The average strength of reinforced concrete of the same series for cubes and prisms were f c, cube = 34.8 and f c, prism = 30.9 М p а , respectively. Relative deformations of reinforced prism concrete under axial compression at σ c = f c, prism were ε c = 166. 1 × 10 -5 . Reinforcement of cubes and prisms with a polymer composition of the second series increased cube and prism strength by 14.2 and 12.0%, respectively. For the third series of samples with one - time loading of control concrete - f c, cube = 31. 3 МPа, f c, prism = 23. 6 МPа, E c = 21.7 GPа, ε c = 213.9×10 - 5 and reinforced concrete - f c, cube = 35. 9 МPа, f c, prism = 25. 8 МПа, E c = 33.0 GPа, ε c = 192.4×10 - 5 . Reinforcement of concrete samples of this series increased prism strength by 8.6%. The diagram of the deformation of the concrete during a single load of the first series of prisms is shown in Fig. 4.