PSI - Issue 30

A.A. Kychkin et al. / Procedia Structural Integrity 30 (2020) 64–70

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A.A.Kychkin et al / Structural Integrity Procedia 00 (2019) 000 – 000

The static tension test results before and after exposure are presented in Figure 2.

Fig. 2. Time dependent strength of BFRP rebars 6 (1 and 3) and 8 (2 and 4) mm in diameter in climatic conditions of Yakutsk (1 and 2) and Gelendzhik (3 and 4).

The tension test results suggest that tensile strength increases for both samples from 6 to 13%. The analysis of the results shows that climatic factors have no detrimental effect on BFRP strength. Tensile strength values changed most perceptibly for samples exposed to very cold climate. Figure 3 presents temperature dependent elastic modulus, modulus of loss, and mechanical loss tangent of BFRP rebars 6, 8, and 10mm in diameter after exposure in Yakutsk. Table 1 shows the values of characteristic temperatures for BFRP rebars after exposure in Yakutsk.

Fig. 3. Temperature dependent elastic modulus (E’), modu lus of loss (E’’), and mechanical loss tangent (tgδ) of BFRP rebars after exposure in Yakutsk, where Ø6mm is green, Ø8mm is red, and Ø10mm is blue.

Table 1 - Results of dynamic mechanical analysis for BFRP samples 6, 8, and 10 mm in diameter after exposure in Yakutsk. Factor Ø6 mm Ø 8mm Ø 10mm Extrapolated value for the start of the transition on the modulus of elasticity curve, ( ° С ) 126.6 127.9 127.6