Study on early hydration of sulfoaluminate cement using an electrical resistivity method

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.