The resistivity of fresh concrete was obtained for the period from casting to the age of 72 h by a non-contact electrical resistivity measurement. Early hydration process of three types of concrete with the ratio of water to binder in mass of 0.4, including ordinary Portland cement concrete (OPC), concrete with fly ash of 30% (FAC) and concrete with silica fume of 5% (SFC), were analysed and compared. Based on resistivity data and Krstulovic-Dabic model, parameters of kinetics model were obtained, and hydration kinetics process was characterized. Results show that early hydration process of concrete can be characterized by the development of resistivity. Early hydration process is divided into five stages, which are ion dissolution, induction, acceleration, transition and deceleration. Incorporation of fly ash reduces the peak of hydration rate and delays the second hydration acceleration, whereas addition of 5% of silica fume has little effect on the early hydration of concrete. The compressive strength and electrical resistivity of three types of concrete show a good linear correlation at early age. The parameters of Krstulovic-Dabic kinetic model can be fitted well by using resistivity data of concrete.

通过非接触电阻率测量获得了从浇铸到72小时的新鲜混凝土的电阻率。水与粘结剂的质量比为0.4的三种类型的混凝土的早期水化过程，包括普通波特兰水泥混凝土（OPC），粉煤灰为30％的混凝土（FAC）和硅灰为5％的混凝土（SFC） ，进行了分析和比较。基于电阻率数据和Krstulovic-Dabic模型，获得了动力学模型的参数，并对水化动力学过程进行了表征。结果表明，混凝土的早期水化过程可以通过电阻率的发展来表征。早期水化过程分为五个阶段，分别是离子溶解，诱导，加速，过渡和减速。粉煤灰的加入降低了水合速率的峰值并延迟了第二次水合加速，而添加5％的硅粉对混凝土的早期水合几乎没有影响。三种类型的混凝土的抗压强度和电阻率在早期显示出良好的线性关系。利用混凝土的电阻率数据可以很好地拟合Krstulovic-Dabic动力学模型的参数。