Numerical Simulation of Aggregate Shapes of Two-Dimensional Concrete and Its Application

A practical method is presented for modeling of two-dimensional arbitrary shape aggregates. An efficient algorithm is developed for mass concrete whose aggregate content reaches 60-70%. All the same kind of random triangular fundamental aggregates are generated at one time, then the two-dimensional arbitrary shape aggregates are generated by the method of random extension. The presented algorithm is superior to common methods, in which all aggregates are generated one by one. This algorithm avoids the inefficiency and low aggregate content of other algorithms. Corresponding software 2D-RAS is developed on the basis of this algorithm. And by means of this software, behaviors of the three-grading concrete specimens under uniaxial tension and bending are studied. The effect of shape of aggregates on mechanical behaviors of concrete is preliminarily investigated. The results indicate that critical load capacity of specimens with random circular aggregate is greater than that of the specimen with arbitrary polygonal aggregate. The cracking depth of the specimen with random arbitrary shape aggregate is larger than that of the specimen with circular aggregate.