[M-IS05] ジオヘリテイジにおける地盤材料：風化と調査技術、保全

[MIS05-P03] Study on the effect of pore size distribution on brick deterioration

春日 瑞稀²、*小口 千明¹ (1.埼玉大学大学院理工学研究科、2.埼玉大学工学部)

キーワード：レンガ、塩類風化、実験

In Japan, there are more than 70 brick buildings designated as Important Cultural Properties, including Tokyo Station and Tomioka Silk Mill. Those bricks originally show a variety of physical properties depending on the material mixing ratio and firing conditions at the time of manufacture. Weathering and deterioration conditions of those brick buildings were caused by brick characteristics, especially pore size distribution which is considered to be the most important factor in salt weathering, ie., the most influential type of weathering. The present study examines 6 types of handmade bricks with voids of different shapes that were prepared and carried out salt weathering experiment. The salt weathering experiments were conducted using sodium sulfate and magnesium sulfate solutions, and 11 cycles of immersion at 20°C for 12 hours and drying at 40°C for 12 hours were repeated. The results show that bricks with many micropores cause greater damage.