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Journal of Conservation Science 2009;25(2):147-154.
Published online June 20, 2009.
수용성 염에 의한 암석의 강도와 수증기확산저항도 변화에 관한 연구
임권웅, 도진영
Study on the Change of Strength and Water Vapour Diffusion Resistant of Stone by Soluble Salt
Kwonwoong Lim, Jinyoung Do
초 록
경주지역 석조문화재의 주요 부재로 사용된 화강암과 응회암을 대상으로 수용성 염에 의한 풍화초기 암석의 강도와 수증기확산저항도 변화를 연구하였다. 수용성 염으로는 석조문화재에서 자주 검출되며, 용해도가 다른 Na2SO4 와 CaSO4 ․ 2H2O를 사용하였다. 휨강도는 응회암시편에서는 염종류와 무관하게 증가했으며, 화강암에서는 감소하였다. 일축압축강도는 응회암을 CaSO4 ․ 2H2O로 처리 했을 때 증가하였고, Na2SO4로 처리 했을 때 감소하였으며, 화강암은 CaSO4 ․ 2H2O 처리 시 약간의 감소가, Na2SO4 처리 때에는 증가경향이 나타났다. 수증기확산저항도는 응회암에서 염 종류와 상관없이 증가했고, 화강암은 CaSO4 ․ 2H2O로 처리했을 때 증가했다. 연구결과, 염의 집적에 의한 풍화의 초기단 계에서는 기계적 강도와 수증기확산저항도가 증가될 수 있음이 확인되었다.
중심어: 석조문화재, 수용성 염, 겉보기 밀도, 휨강도, 일축압축강도, 수증기확산저항도
ABSTRACT
The change of strength and water vapour diffusion resistant by soluble salts was investigated in the tuff and granite used in many stone monuments of Gyeongju area. With Na2SO4 and CaSO4 ․ 2H2O were treated the rock samples to understand the difference of solubility. The densities of the tested rocks were increased by the impregnation of CaSO4 ․ 2H2O and Na2SO4. The flexural strength was increased in the tuff samples but decreased in the granite as the salts increased in the pore. In the tuff, the uniaxial compressive strength was increased by CaSO4 ․ 2H2O, but decreased by Na2SO4. In the granite, it was decreased slightly by CaSO4 ․ 2H2O, but increased by Na2SO4. The water vapour diffusion resistant was increased by the salts in both rocks. As results, it was cleared that the mechanical strength colud be increased in early stage of weathering by the accumulation of salt and water vapour diffusion resistant.
Key Words: Stone monument, Soluble salt, Bulk density, Flexural strength, Uniaxial compressive strength, Water vapour diffusion resistant


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