Influence of freeze-thaw cycles and sulfate corrosion resistance on shotcrete with and without steel fiber

摘要

Shotcrete with low-alkali accelerator has short final setting time, high early strength, and various hydration products and microstructures because of different hydration processes of ordinary concrete without accelerator. In tunnel operation processes, a shotcrete single-layer lining structure is subjected to positive and negative temperature alternation and corrosion ions, particularly sulfate ion. The durability and service life of the lining structure are seriously threatened.