建築用自然石に固有の鉱物および組織に起因する変質現象の究明 : 調査事例による石材表層に生じる変質現象に関する考察

概要

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Deterioration of stones such as delamination, discoloration and efflorescence, which became evident during on-site surveys was investigated from petrological and chemical viewpoints. Results showed that most cases of the deterioration were caused by chemical reactions of inherent minerals to external water absorbed or action of crystallisation force caused by soluble salts in water to the fragile texture. To summarize, the deterioration can be classified into the following categories: 1. Exfoliation by expansion due to oxidation of iron sulfide minerals 2. Delamination of weak cohesive structure due to florescence 3. Exfoliation by saturation and dissolving of zeolite minerals 4. Discoloration by rust of iron sulfide minerals 5. Dissolution of carbonate materials due to acid rainwater 6. Efflorescence from crack and weak cohesive structure by soluble salts Much of the deterioration due to minerals inherent in stones was clarified. Many imported stones without adequate data are being used in construction. Therefore, the importance of obtaining data on these materials, especially petrographic data, can be emphasized.
社団法人日本建築学会の論文
1998-08-30