Probabilistic Modelling of Strength of Concretes with RCA

abstractPL: -abstractEN: The subject of the work is research and probabilistic modelling of compressiveand tensile strength of concrete with recycled concrete aggregate (RCA). Sixteen series of concretecontaining natural aggregate and RCA of 50% by mass of coarse aggregate (fraction 4 – 16 mm).Concrete specimens were tested for compressive and tensile splitting strength. In the study alsothe absorptivity of recycled and natural aggregate was tested, which is the amount of water that bothtypes of aggregates can absorb during concrete mix. Based on the results models were formulateddescribing the compressive and tensile strength of concrete with RCA. These models are based onthe design parameters of the concrete mix. In order to determine the coefficients of the modelsan estimating of a function of several variables by linear regression was performed. Complianceof the values calculated using the models with the values obtained from the tests was determinedby Monte Carlo simulation. The results indicated a possibility of obtaining a high compliance ofthe test results with results obtained from simulations based on formulated modelsscore: 8collation: 207-201