將磁化水用於混凝土工程，目前仍無價廉且有效監測磁化水磁化程度的方法，因此難以掌握混凝土品質的改善程度。本研究嘗試利用水磁化過程中產生的霍爾電壓，作為即時監測水磁化的指標。研究初期尋求能穩定量測霍爾電壓的方法，再探討水流量和流速對霍爾電壓的影響，最後並觀察磁化水的基本性質，及霍爾電壓與水泥砂漿抗壓強度、流度值及凝結時間的關係。 研究結果發現若使用導電管、長電極、外加電容和循環水可量測到相對穩定的霍爾電壓，但其再現性則不令人滿意。加大水流量和流速會增加霍爾電壓，但不易建立有意義的統計關係。使用磁化水可縮短水泥漿的凝結時間，增加砂漿的抗壓強度及降低砂漿的流度值。 In applying magnetic water into concrete engineering, there isn't any cheap and efficient way to monitor the degree of magnetization of magnetic water currently. Therefore, it's hard to control the quality of concrete. This research temps to take Hall voltage produced in the process of magnetization as the monitoring indicator of magnetic water. The preliminary research starts in searching for methods that enable to measure the Hall voltage stably, furthermore, how water amount and its flow speed affect the Hall voltage. At the end, observe the character of magnetic water, and the relationships of the Hall voltage against compressive strength of hydraulic cement mortars, its flow value, and setting time. The results indicate that the stability of the Hall voltage can be measured with tubes of electric conduction, long electrode, plus capacitance, and circulating water, however, the reproducibility is not satisfied. The increase of water amount and its flow rate increases the Hall voltage, but the statistics is meaningless. Use of magnetic water can reduce the setting time of cement paste, increase the compression strength, and reduce the flow value of cement mortars.