ALC外壁仕上げの凍害劣化の評価方法に関する実験研究

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ALC has high water penetration and high moisture penetration. In the case of using ALC as a external wall, surface finishings are indispensable to protect ALC. In cold region, some types of surface coatings are damaged by freezing and thawing. It is necessary to select suitable surface coatings fit for use condition. However, this mechanism of deterioration is very compricated, because water supply is not only from outside (thawed water of snow or rain) but also from inside (condensation). In this paper, following two test methods are proposed, considering external wall of ALC buildings. (1) One side freezing and thawing test; ALC specimens with surface coatings are freezed and thawed from external side, and water is supplied from opposite side. (2) All side freezing and thawing test; one side of ALC specimen has a surface coating and the other sides are sealed. Specimens are freezed in air and thawed in water. In order to realize basic properties of ALC walls with surface coating, following three test methods are proposed. (1) Moisture permeability test (2) Water permeability test (2) High-pressure water permeability test These test methods are adopted many types of surface coating, and following conclusion can be presented. (1) Surface coatings with high moisture permeability have small damage for one side freezing and thawing test, and surface coatings with low water permeability have small damage for all side freezing and thawing test. (2) Ground treatments are important in the case of surface coatings with high water permeability. (3) Surface coatings which have high moisture permeability and low water permeability is recomended for external wall of ALC in cold region.
1989-02-28

ALC外壁仕上げの凍害劣化の評価方法に関する実験研究

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