Concrete three-phase mesoscopic model construction and internal chloride ion erosion numerical simulation method based on polygonal random aggregate

A construction method, a technique for polygons

Active Publication Date: 2020-01-17
CHONGQING JIAOTONG UNIVERSITY
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Problems solved by technology

Application number CN2017101502969, the patent name is a two-dimensional random generation method of concrete aggregate unit without considering the interface transition zone between cement paste and aggregate

Method used

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  • Concrete three-phase mesoscopic model construction and internal chloride ion erosion numerical simulation method based on polygonal random aggregate
  • Concrete three-phase mesoscopic model construction and internal chloride ion erosion numerical simulation method based on polygonal random aggregate
  • Concrete three-phase mesoscopic model construction and internal chloride ion erosion numerical simulation method based on polygonal random aggregate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] Such as figure 1 as shown, figure 1 As a flow chart for generating concrete random convex polygonal random aggregates, the method for generating polygonal random aggregate particles provided in this embodiment includes the following steps:

[0099]1. Define the initial conditions, including the length and width dimensions X, Y of the concrete specimen, the target volume fraction r of the aggregate, and the minimum particle size of the aggregate D min , the largest aggregate particle size D max , the concrete specimen size of the present embodiment is mostly 100mm, so adopt X, Y to be the concrete specimen of 100mm to carry out numerical calculation, D max 、D min , r can be determined according to specific test conditions, define the initial array and cell array for storing aggregate point line matrix information, and facilitate subsequent information storage and calling;

[0100] 2. Start to generate the i-th random convex polygonal aggregate, and combine the random...

Embodiment 2

[0166] The numerical simulation method of chloride ion erosion in the concrete three-phase mesoscopic model based on polygonal random aggregates provided in this example is based on the finite element software COMSOL for analysis and simulation, and is mainly used for the mesoscopic numerical simulation of chloride ion diffusion in the concrete model. Therefore, it is mainly necessary to use the "transport of dilute species (tds)" module in the chemical species transport module. The Transport of Diluted Species interface is used to calculate the concentration field of dilute solutes in solvents, allowing for the calculation of transport and reactions of species dissolved in gases, liquids, or solids. The driving force for transfer can be diffusion as described by Fick's law, convection coupled with fluid flow, and migration coupled with electric field. The numerical calculation function of this module is used to study the effect of aggregate, interface transition zone and othe...

Embodiment 3

[0186] The model established in this example is a concrete three-phase mesoscopic numerical model of random convex polyhedral aggregates, whose point and line information is more complicated than that of regular circular and regular polygonal aggregates, based on the fact that COMSOL itself supports the import of model files Function, through the establishment of interactive programs between MATLAB generated model files and COMSOL software.

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Abstract

The invention discloses a concrete three-phase mesoscopic model construction method based on polygonal random aggregates. The method comprises the steps that firstly, setting variables of a concrete model; generating convex polygonal random aggregate according to the aggregate particle size range in the concrete model; putting the generated aggregates into a model region range one by one until allthe aggregates are finished, and storing vertex point line data of all the convex polygonal aggregates into a cellular array; translating all aggregate edges according to the thickness of the interface transition region, and connecting to generate the interface transition region; and finally, storing all aggregate and point-line data of an interface transition region. On the basis of the concretethree-phase mesoscopic numerical model, the chloride ion erosion process in the concrete three-phase mesoscopic numerical model is truly simulated, the calculation process is simple and clear, and the numerical simulation calculation efficiency can be greatly improved.

Description

technical field [0001] The invention relates to the technical field of concrete mesoscopic numerical simulation, in particular to a method for constructing a concrete three-phase mesoscopic model based on polygonal random aggregates and a numerical simulation method for internal chloride ion erosion. Background technique [0002] Reinforced concrete appeared in the middle of the 19th century and has been widely used in national infrastructure. However, under marine environmental conditions, the durability damage of reinforced concrete has always been an important and urgent problem that threatens the service life of structures. In the rapid development of the construction industry in all countries in the world, huge economic losses have been caused by structural durability damage. The follow-up maintenance costs of many building structures far exceed the construction costs, and as the years increase, the maintenance costs will further increase, especially The phenomenon of d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T17/20
CPCG06T17/20G06T2210/04
Inventor 吴林键鞠学莉刘明维管理王铎
Owner CHONGQING JIAOTONG UNIVERSITY
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