| Summary: | 碩士 === 國立中央大學 === 土木工程研究所 === 93 === Abstract
Due to the instability of the use of mixing magnetic water with concrete and the lack of any equipment or device for measuring the level of magnetization of magnetic water, the quality and level of magnetization of magnetic water remains unknown, and it is therefore hard to control the quality of concrete. Therefore, this study utilizes Hall voltage produced in the process of magnetization as the indication of reacting to the changes of compressive strength, and is devoted to investigating the principle of Hall voltage of magnetic water and stabilizing it. Also, the relation between compressive strength of mortar and Hall voltage is analyzed by applying the electrode principle of MHD generator in the process of the experiment so as to acquire stable Hall voltage and investigate the impact of level of electrode on compressive strength.
The result of the study indicates that stable Hall voltage can be measured by a 1cm electrode made of copper foil. Moreover, a stable compressive strength curve of compressive strength of mortar mixed by the magnetic water magnetized by the electrode (1cm) can be acquired. The compressive strength increases as the magnetic-field intensity increases according to the experiment data. The compressive strengths of magnetic field: 0.96T>0.84T>0.65T>0.46T. In terms of the relation between compressive strength and Hall voltage, both of them are in a direct proportion as the flow velocity of magnetic water is less than 200m/min. On the contrary, they are in inverse proportion as the velocity is more than 200m/min. Among magnetized electrodes in various lengths and compressive strengths of mortar, based on the observations of the figures, it can be concluded whether Hall Effect has been employed to the utmost will influence the stability of compressive strength of mortar improved by magnetic water.
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