Durability of SAP-modified Fully Recycled Concrete under Freeze-Thaw Cycles

Abstract

This study introduces superabsorbent polymers (SAP) into recycled concrete and, through freeze-thaw cycle tests, unconfined compressive strength tests, and nuclear magnetic resonance (NMR) analysis, evaluates the freeze-thaw resistance and durability of recycled concrete samples under varying freeze-thaw cycles. The results indicate that an appropriate addition of SAP significantly enhances the freeze-thaw resistance of recycled concrete. After 200 freeze-thaw cycles, the RS0.6 sample retained good surface integrity, demonstrating the best performance. Compared to NAC, its mass loss decreased by 1.16%, the relative dynamic modulus improved by 7.01%, and the compressive strength loss rate decreased by 5.41%. Additionally, T₂ spectrum analysis revealed that adding SAP optimized the pore structure of recycled concrete and mitigated pore development during freeze-thaw cycles. As the number of freeze-thaw cycles increased, the RS0.3 and RS0.6 samples demonstrated superior frost resistance compared to NAC. However, an excessive amount of SAP increased pore expansion during subsequent freeze-thaw cycles, ultimately weakening frost resistance.

Keywords

Recycled concrete / SAP / freeze-thaw cycle / pore structure / durability

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