Composite Model for Time-relative Compressive Strength of Recycled Coarse Aggregate Concrete

The compressive strength development process of recycled coarse aggregate concrete (RCAC) directly affects the safety of the engineering structures, which is an important research topic in the concrete mechanics. According to the statistics of the experimental results, the development mechanism principle of the compressive strength of RCAC gradually increasing with curing time was analyzed. The mathematical property was introduced to reveal the defects of the traditional hyperbolic model of the time-relative compressive strength (TRCS), and to point out that the mathematical nature of the ideal TRCS model should have. A new CBS model was presented for TRCS. The mathematical analysis shows that the hyperbolic model is a special case of the CBS model, and in another hand the CBS model overcomes the defects of the hyperbolic model.