Abstract: This paper presents a random model for concrete materials from CT scanning of concrete sections and a reconstruction model using the information abstracted from CT images. According to the physical meaning of CT number, we have developed a computer code for the reconstruction by integrating the characteristics of existing models. This reconstruction model considers various types of information abstracted from the CT images, including the shapes and gradation of aggregates and the features of pores. Adhesion of mortar to aggregates is modeled using a new method of adding one layer of interface elements between aggregates and mortar, in replacement of the traditional method of adding contact elements. We conducted a detailed analysis on the mechanical behaviors of concrete under dynamic loads, compressive or tensile, and made a comparison with the CT test results. The analysis shows that the reconstruction model has good performances in numerical tests of concrete.