| Summary: | 碩士 === 中原大學 === 土木工程學系 === 89 === The aim of this research is to investigate how vibration on newly poured concrete affect its compressive and bonding strength. The main object is to study the variation in compressive and bonding strength, also their relationship, of concrete of two different water-cement ratio (w/c = 0.495 and w/c = 0.61) under different vibration duration.
The mix proportions of the two concrete is first mixed to test for its properties. Then compressive test cylinders and bonding test specimens are poured. After a specific time, they are mounted on the vibration table. Specimens are subjected to different vibration frequency, amplitude and duration. After vibration, all specimens are cured by immersing in the curing pool.
Test results show that: for both water-cement ratio of 0.495 and 0.61, the main reduction on compressive and bonding strength occurs for vibration at 6 hours and 12 hours with a duration of 90 to 150 seconds.
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