The Research Of Aggregate Distribution Effect In Concrete Carbonation Based On The Cellular Automata

The cellular automata, this new method is used in the research on the concrete carbonation and the aggregate distribution effect. First the cellular automata model based on the concrete carbonation mechanism is presented. The cellular automata , the finite difference method and the finite element method are compared .It explains the cellular automata is more suitable for the concrete carbonation computation. By the computational method of carbonation depth, the carbonation depth and the carbonized time relations are obtained. The concrete carbonation depth according to the testing datum is forecasted.Based on The method of two-dimensional concrete coarse aggregate random generation according to a given gradation and method of random distribution in a concrete section, the new method of judging aggregates' overlaps and producing smallest spacing of the aggregates is presented .it causes the random distribution of the aggregates more effective.The result of simulating the aggregate random distribution and the cellular automata are united to calculate the concrete carbonation considered the coarse aggregate distribution. It is a bridge from the concrete the microscopic character to the macroscopic character. The concrete carbonation computation with different aggregate content is carried on. The carbonation average depth and the carbonized time relational curve with differentaggregate content is compared. The reason for the difference is analyzed. The fitting to the aggregate content and the diffusion coefficient relational curved surface is carried on. It indicates that considering the coarse aggregate distribution is important to the research on concrete performance and offers a practical formula for engineering application.