Abstract

Accelerated freeze–thaw cycling tests in 5.0 wt% NaCl solutions were performed to better understand the durability of ultra-high-performance concrete (UHPC) with a 0.2 water-binder ratio under freeze–thaw cycles in a salt environment (as experienced by concrete used in harsh marine environments). The bound water and pore structure were evaluated before and after cycling. Unhydrated cement rehydrated during the freeze–thaw cycling and hydration products repaired small pores (<100 nm). The ice-formation expansion rates of 0–10 wt% NaCl solutions were determined. The damage mechanisms were discussed considering the supercooling effect and salt concentration. The conclusions of this study are valid for specific properties of UHPC under freeze–thaw cycling in salt solution.

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