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

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

*Yuzuki Kudo¹, Takeshi Saito², Junko Hara², Chiaki T. Oguchi¹ (1.Department of Engineering Saitama Unversity, 2.National Institute of Advanced Industrial Science and Technology)

Keywords:Mortar, salt weathering, water repellent, sulfate attack, concrete

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.