Abstract
The aggregate generation of concrete is one of the important problems in concrete mesoscopic mechanics. Firstly, the mesoscopic numerical model with spherical aggregates is obtained by the method of excluding the occupied space, and fully-graded concrete model of high aggregate content can be quickly generated. Then, based on the spherical aggregate model, the generation method of random convex polyhedral aggregates is proposed. Finally, a full-graded concrete model with spherical aggregates is shown in Case 1 and a cylindrical concrete model with random convex polyhedral aggregates is shown in Case 2. The result shows that the aggregates are equally distributed in the concrete models which can be used in the study of mesoscopic numerical calculation.
Highlights
Concrete is a kind of typical heterogeneous composite material
The concrete mesoscopic mechanics method mainly includes: the generation and packing of aggregates, mesh discretization, and the numerical analysis of the mesoscopic mechanics model. These three aspects are the main contents of the mesoscopic mechanics, and the major difficulties. The former two aspects are the basis of mesoscopic mechanics analysis, the generation and packing of aggregates with high content is difficult, while the aggregate content is very high in the actual hydraulic structures of mass concrete
A 450 mm×450 mm×450 mm full-graded concrete cube model with random spherical aggregates is shown in Case 1 and a cylindrical concrete model with random convex polyhedral aggregates is shown in Case 2, The results show that the aggregates are distributed in the concrete models which can be used in the study of mesoscopic numerical calculation
Summary
Concrete is a kind of typical heterogeneous composite material. Mesoscopic mechanics is one of the important methods of property research of concrete material, which has distinct advantages. The concrete mesoscopic mechanics method mainly includes: the generation and packing of aggregates, mesh discretization, and the numerical analysis of the mesoscopic mechanics model. These three aspects are the main contents of the mesoscopic mechanics, and the major difficulties. Scholars proposed various methods to generate and pack concrete aggregates, and achieved a series of research results. Wittmann earlier proposed a generation method based on natural aggregate shape, which promotes the development of the concrete mesoscopic modeling [1]. The method of excluding the occupied space is used to generate and pack spherical aggregates, and the concrete mesoscopic mechanics model with high content of aggregates can be quickly obtained. A 450 mm×450 mm×450 mm full-graded concrete cube model with random spherical aggregates is shown in Case 1 and a cylindrical concrete model with random convex polyhedral aggregates is shown in Case 2, The results show that the aggregates are distributed in the concrete models which can be used in the study of mesoscopic numerical calculation
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