Modelling and Software Development of Random Aggregate Model of Concrete
Keywords: Random Aggregate Model, Fiber, Recycled Aggregate, ITZ, Voronoi, Matlab
The Random aggregate model is widely used to study the performance and properties of concrete under service and accident conditions. To study the degradation mechanism and law of thermal and mechanical properties of geopolymer concrete at high temperatures, we are using object-oriented programming(OOP) in MATLAB to develop a software called Multi-scale simulation system of Concrete Material(MissCM). It is based on some random aggregate generation algorithms, 3D scanning models of real aggregates, Monte Carlo packing algorithm and our patented method which is based on the Voronoi graph et al. The GUI and some results of this software are shown in Figure 1.
(a) The shape database of real aggregates ---Principle and statistical results
(a) The shape database of real aggregates----partial results
(b) Random Aggregate Model -----Monte Carlo Packing
(b) Random Aggregate Model----Voronio Packing
Figure 1. The GUI of the software MissCM
Currently implemented functions:
The inclusions of the mesoscopic model can be considered as aggregates, steel fibres, pores and cracks, and each inclusion can be arbitrarily combined, among which the aggregate meets fuller grading requirements;
Aggregate type can be natural aggregate(NA) and recycled concrete aggregate(RCA), in which two-generation methods of RCA are included by shrinkage and cutting operation;
The ITZ can be inserted between the aggregate(NA and RCA) and the mortar, and the thickness of the ITZ can be fixed or randomly generated within a certain range;
The Aggregate shapes can be round, ellipse, regular polygon, random polygon, and real aggregate shapes based on scanning, and the aggregate of different shapes can be arbitrarily combined in proportion to the area;
In addition to the conventional Monte Carlo method, we also add our patented method, which is mainly based on the Voronoi diagram and has the feature of very small time consumption.
Main References
Min Yu, Yin Chi, Hao Bao, Jian-Qiao Ye, Li-Hua Xu, Jun-Jie Huang. A fast generation method for the 2D random aggregate model of concrete with a mixture of pebbles and rubbles. Patent for invention, patent number: ZL201710086411.0, Application date:17-02-2017, authorized date: 17-5-2019.
Min Yu, Jian-Qiao Ye, Hao Bao, Yin Chi, Li-Hua Xu. A fast generation method for the 3D random aggregate model of concrete with a mixture of pebbles and rubbles. Patent for invention, patent number: ZL201710086212.X, Application date:17-02-2017, authorized date: 05-06-2019.
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