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Durability of Plastic Fiber-Reinforced Multilayer Shotcrete Panels

This work examined the durability of multilayer sandwich panels cast in-situ with shotcrete technology. The behavior of different shotcrete mixtures toward actions caused by climatic variation changes is analyzed. A standard shotcrete mixture, normally used by panel producers, and 3 modified and optimized shotcretes (with silica fume, expansive agent, and plastic fibers) were compared. Two accelerated tests were conducted: an accelerated cracking test for short-term degradation and an accelerated aging test for long-term degradation. Test procedures and the climatic chamber used in the aging test are illustrated. Results are presented of an investigation into the superficial cracking density panel specimens. The data obtained at the end of the accelerated tests was compared. Findings point to a cracking density of optimized and modified shotcretes lower than that of standard shotcrete.