###### Abstract  
This study aims to propose a hydration kinetic model for the cement-eggshell powder binary system and predict the performance development of composite concrete through this model. The specific content and results of the model are as follows. First, based on the cumulative hydration heat of the cement and eggshell powder binary system in the first seven days, the parameters of the cement hydration model and the eggshell powder nucleation parameter are calibrated. These parameters remain constant regardless of the mix ratio. Secondly, the hydration heat of the cement-eggshell powder binary system over 28 days is calculated using the hydration model. The results show that at 28 days, for specimens with 0%, 7.5%, and 15% eggshell powder substitution, the cement hydration degrees are 0.832, 0.882, and 0.923, respectively. The hydration heat per gram of cement is 402.69, 426.88, and 446.73 \(\mathrm{J/g}\) cement, respectively, while the hydration heat per gram of binder is 402.69, 394.86, and 379.72 \(\mathrm{J/g}\) binder, respectively. Additionally, the hydration model is used to calculate the chemically bound water and calcium hydroxide content of the cement-eggshell powder binary system. At 28 days, for samples with 0%, 7.5%, and 15% eggshell powder, the chemically bound water content is 0.191, 0.188, and 0.180 \(\mathrm{g/g}\) binder, respectively, and the calcium hydroxide content is 0.183, 0.179, and 0.173 \(\mathrm{g/g}\) binder, respectively. Finally, a power function is used to regress the calculated hydration heat with experimentally measured compressive strength and surface electrical resistivity. The correlation coefficients for compressive strength and surface electrical resistivity are 0.8474 and 0.9714, respectively. This is because the strength weak point effect of eggshell powder has minimal impact on hydration heat and surface electrical resistivity experiments but significantly affects the strength experiment. eggshell powder; hydration model; compressive strength; hydration heat; hydration products 2024202024309 the input parameters of the model and the mineral composition of cement is obtained. Based on the hydration model, the hydration degree, pore structure, and compressive strength of concrete are predicted. The hydration model proposed by [PERSON] et al. [3] calculated the hydration degree, pore structure formation, relative humidity change, and hydration heat release of high-strength concrete. The relationship between the hydration model parameters and the composition of concrete materials is obtained by using the neural network method. [PERSON] and [PERSON] [4] proposed a multi-component hydration model to calculate the hydration degree of cement. Their method considered the thermodynamic equilibrium between solid hydration products and pore solution, and calculated the composition of hydration products and the concentration of ions in pore solution. The hydration model proposed by [PERSON] [5] considered the influence of the water-cement ratio and spatial distribution of hydration products on hydration rate, which is suitable for both general strength concrete and high strength concrete. The hydration model proposed by [PERSON] et al. [6] considered the growth of calcium silicate hydrate (C-S-H), the formation of hydration exothermic peak, the reduction in reaction rate in the late reaction, and the influence of pore structure on hydration reaction rate. With the development of concrete technology, more and more mineral admixtures are used in concrete production. There are many types of mineral admixtures, and common mineral admixtures mainly include silica fume, fly ash, slag, and limestone powder. First, the literature on silica fume is summarized as follows. [PERSON] [7] proposed chemical reaction equations for silica fume based on the microscopic analysis of the cement-silica fume binary system and calculated the final composition and porosity of the reaction products of the cement-silica fume binary mixture. The model proposed by [PERSON] et al.