| Summary: | 碩士 === 國立臺北科技大學 === 資源工程研究所 === 107 === In recent years, cultural heritage preservation and rehabilitation have been gradually emphasized in Taiwan. Although the amount of literature and studies buildings and materials have increased substaintially, studies of mortar application in old Japanese roof tiles (Ibushikawara) are still scarce. Also, reasonable importance has yet been credited to partial application or the mortar, such as its application to the Ibushikawara. Since typhoons occur frequently in Taiwan, the adhesive bond strength of lime mortars for jointing the Japanese roof tiles needs to be strong enough in order to prevent any damages that may occur to the roof-tile due to strong winds. On the other hand, during roof repairmen and roof-tile replacement, the mortar need to be removed easily from the old roof-tiles in order to repurpose the tiles.
Due to the lack of knowledge in tile mortar, cement was used in some restoration works to repair old Japanese roof tile in Taiwan. Due to its overpowering mechanical strength, cement would damage the tile surface and cause the tiles to lose its repurposing ability. Therefore, this study aims to discover the optimal proportion of the mortars that has sufficient adhesive bond strength to comply with Taiwan's strong wind resistance regulations and can be easily removed from the roof-tile.
This study adopts the Taguchi method with references to literatures and mortar proportions used by traditional craftsmen. A total of eight factors are used optimize the results, including lime-sand ratio, fiber ratio, and the types of lime, etc.. The preliminary results revealed that the adhesive bond strength of all groups of mortar in this study meet the Taiwanese standard of 804 kg/m2, and some of them can be removed completely from the old Japanese roof-tiles.
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