Abstract
The exfoliation of exterior tiles is affected by the behavior of the tiles and concrete caused environmental factors such as sunlight, and also by the changes in the physical properties of the materials with the passage of time. For the under layer mortar between the concrete and tiles, pre-mixed mortar with lightweight aggregate is often used. Using 3 types of this mortar and a conventional site-mixed mortar, their follow up properties were studied by preparing dry-wet cycled specimens that were then subjected to load tests. It was found that the follow up properties improved as the compressive strength increased, and that all specimens became harder when dry-wet cycled. Even if the basic physical properties of the lightweight mortars are satisfactory, caution is required because their follow up properties tend to vary significantly under dry-wet cycling.
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