A non-contacting electrical resistivity measurement device was used for measuring the electrical resistivity of early hydration samples of sulfoaluminate cement, a type of rapid-hardening cement. The early hydration process was monitored and the results show that the main early hydration of sulfoaluminate cement was accomplished within the initial 6 h. With the addition of the accelerator to improve the early strength, the hydration process was accelerated as demonstrated by the resistivity-time curve. The agent performed its role in the initial 15 min and reduced the electrical resistivity. The experimental results obtained by means of X-ray diffraction and the hydrated heat instrument were assessed to elucidate the relationship between the hydration process and the electrical resistivity of sulfoaluminate cement.
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