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. 2021 Nov 7;13(21):3844. doi: 10.3390/polym13213844

Figure 14.

Figure 14

The SEM images of fracture surface of (A) GFRP bar at 60 °C in water [31], (B) GFRP bar at 60 °C in alkaline solution, (C) carbon fiber coat of HFRP bar at 60 °C in alkaline solution and (D) GFRP close to the CFRP/GFRP interface of HFRP bar at 60 °C in alkaline solution [4].