[M-IS02] Geomaterials in cultural heritage: weathering, investigation techniques, and conservation

[MIS02-P05] Water Repellent and Influence of Environmental Conditions on Concrete Sulphate Weathering.

*工藤 優津樹¹、斎藤 健志²、原 淳子²、小口 千明¹ (1.埼玉大学 理工学研究科、2.産業技術総合研究所)

キーワード：モルタル、塩類風化、吸水防止剤　表面含浸材、硫酸塩劣化、コンクリート

The present study carried out salt weathering experiments with sodium sulphate and magnesium to investigate the differences in sulphate attack on concrete under different temperature conditions and the effectiveness of silane-based water repellent. The results showed that a significantly higher solution absorption and a higher elastic wave reduction factor were observed when sodium sulphate solution was used at 5°C compared to 20°C immersion. This indicates that water absorption at lower temperatures is more prone to weathering. Furthermore, it was found that the water-repellent reduces solution absorption and prevents salt precipitation on the surface, suggesting that it was effective in terms of durability and aesthetic retention against sulphates.