2025 Volume 81 Issue 6 Article ID: 24-00004
The effect of a highly concentrated NaCl solution used as mixing water on the performance of concrete was experimentally investigated. The experimental results showed that when the NaCl concentration in the mixing water was 20% or higher, the adiabatic temperature rise and heat generation rate were smaller than those of tap water, and drying shrinkage was also suppressed as a result of the suppression of drying. The compressive strength of the material was found to be about the same in outdoor air curing as in sealed curing, although the 28-day strength was reduced by about 20%. Numerical results indicate that the use of NaCl solution of more than 20% as mixing water is effective in preventing initial cracking due to drying and thermal stress. The results also suggest that the use of aqueous NaCl solution is effective in preventing steel corrosion due to the significant increase in concrete saturation and the decrease in dissolved oxygen content caused by the presence of solute.
