Macro-micro model equivalence method for analyzing use state of reinforced concrete in chloride ion environment

A reinforced concrete and state analysis technology, applied in the effective field, can solve problems such as changing the chloride ion transport channel, steel bar corrosion, concrete protective layer cracking, etc., and achieves the effect of efficient analysis means, simple operation process, and clear design ideas

Inactive Publication Date: 2021-10-08
NANJING VOCATIONAL UNIV OF IND TECH
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Problems solved by technology

However, in the marine environment, chloride ion corrosion of concrete will lead to corrosion of steel bars, and the volume expansion of steel bar corrosion will lead to cracking of the concrete protective layer, which will significantly change the transport channel of chloride ions in concrete, and intensify the corrosion damage process of steel bars
The coupling of the above processes makes the analysis of the service state of reinforced concrete structures relatively complicated

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[0027] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0028] S1. Realize the equivalence of concrete mesoscopic and macroscopic models in terms of mechanical properties. According to the material parameters of concrete mesoscopic model (see Table 1), the aging process of mesoscopic concrete uniaxial tension is analyzed, and the stress-strain curve of concrete is obtained ( figure 1 ), so as to obtain the equivalent material parameters of the concrete macro model at the same size, the tensile strength of the corresponding concrete macro model is about 0.95MPa, and the elastic modulus is about 39.5GPa.

[0029] Table 1 Mechanical parameters of each component of concrete

[0030] Material Elastic modulus (MPa) Poisson's ratio Tensile strength (MPa) cement mortar 30×10 3

0.2 ...

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Abstract

The invention discloses a macro-micro model equivalence method for analyzing the use state of reinforced concrete in a chloride ion environment, and relates to the technical field of building material analysis, and the method comprises the following steps: S1, establishing equivalence of mechanical properties of micro-concrete and macro-concrete models; S2, establishing an equivalent diffusion coefficient of a single aggregate and ITZ; S3, according to the quantity ratio of the aggregate with each particle size, obtaining equivalent diffusion coefficient Deq of aggregate and ITZ; and S4, enabling the mortar, the aggregate and ITZ mesoscopic concrete to be equivalent to a concrete macroscopic diffusion coefficient D. According to the method disclosed by the invention, aiming at a complex maritime work environment, the calculation dimension of an analysis main body can be effectively reduced and the calculation efficiency is improved while the analysis requirement is met by the equivalent method, and the basic method in the durability research of the reinforced concrete structure is further enriched and developed.

Description

technical field [0001] The invention belongs to the technical field of building material analysis, and in particular relates to a macro-micro model equivalent method for analyzing the use state of reinforced concrete in a chloride ion environment. Background technique [0002] With the rapid development of my country's economy, some important cross-sea bridges, subsea tunnels and other infrastructure supported by top technologies have been put into construction or use. Concrete, as a material widely used in infrastructure construction, has become increasingly prominent in its construction and use in terms of safety and durability, which puts forward higher requirements for design. Therefore, the proposal and application of the basic methods in the durability research of reinforced concrete structures have received great attention. [0003] Concrete is a composite material consisting of coarse aggregate, mortar, and a bonded interface between the two. In numerical simulatio...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F30/13G06F119/14
CPCG06F30/20G06F30/13G06F2119/14
Inventor 张芹
Owner NANJING VOCATIONAL UNIV OF IND TECH
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