The durability problem of composite concrete structures is becoming more and more serious, and in line with the development trend of BIM technology, BIM technology is applied to assess the durability of concrete structures. In this paper, mechanical property tests and durability tests were conducted by making test specimens of RRCM composite concrete and C40 ordinary concrete with different mix ratios, respectively. For the first time, a quantitative BIM modeling and analysis method for durability of RRCM composite concrete structures is proposed. The factors affecting the structural durability were explored from the aspects of environment, materials and components respectively, and the carbonation depth of concrete and corrosion of steel reinforcement were calculated with the influence of components as the main focus. Taking the carbonation depth, concrete strength, and crack width as the durability quantitative analysis indexes, we input all the data related to the composite concrete structure into the BIM model, and analyze the durability of the composite concrete structure quantitatively by using the comprehensive durability evaluation matrix. The analysis results show that the RRCM composite concrete we designed has an ultimate tensile strength of 4105 kN in terms of mechanical performance, and the flexural strength is significantly improved compared with ordinary C40 composite concrete. The maximum error between our proposed BIM modeling technique and the actual measured carbonation depth in the carbonation test was 7.27% ≤ 10%, indicating that the method can be used for the assessment of carbonation of composite concrete. In the reinforcement corrosion test, the maximum error between the measured and actual measured reinforcement corrosion rate was 28.13% ≤ 30%, indicating that the method can be used for reference in the durability calculation of actual projects.
