| Summary: | 碩士 === 國立中興大學 === 土木工程學系所 === 102 === The purpose of this research is to investigate the out-of-plane flexural bond strength of brick walls. Two-hundred and twenty specimens were made in this study. The variables included type of brick, finess modulus of sand, water content of brick, water-cement ratio(W/C) of mortar, and relative humidity of curing. The following results were observed.
1. Brick type will affect the bond strength, but not as apparent as other variables.
2. Bond strength of brick walls with coarse sand (FM = 2.67) was higher than that with fine sand (FM = 1.99), the increase was about 50%.
3. The bricks better be water-saturated when laying, otherwise, the bond strength would be reduced by about 90%.
4. The water-cement ratio of mortar affects the bond strength. Bond strength with W/C of 0.7 was lower than that with W/C of 0.5 by approximately 68%. Addition of methyl cellulose in the mortar increases the bond strength. For W/C of 0.7, the increase could be 613%, while for W/C of 0.5, the increases was 160%.
5. Higher curing humidity will lead to higher bond strength, the increase could be up to 90%.
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