Study on rock properties of building stones used in historical heritages

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To elucidate the mechanism of the deterioration observed at the Orval Abbey (Belgium) and Yoshimi-Hyaku-Ana (Saitama), environmental monitoring and rock-property investigation were performed. These two sites are both damaged by salt efflorescence, although the weathering style and mechanisms are different. The weathering experiments were also performed using the rocks used in these historical sites. From these field survey and experimental knowledge, it is important to adjust the proper environment against to the salt efflorescence and monitoring moisture movement inside of the rock materials.