Method for predicting service life of structural concrete under erosion of sulfate environment

A technology for life prediction and concrete, which is applied to the field of life prediction of structural concrete under the erosion of sulfate environment, can solve the problems of inaccurate results of prediction methods and inability to quantitatively analyze, and achieve the effects of accurate calculation, accurate life prediction and high stability

Pending Publication Date: 2021-10-08
SOUTHEAST UNIV
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Problems solved by technology

[0004] Purpose of the invention: The method for predicting the life of structural concrete under sulfate environment erosion according to the present invention solves the problem that the results of existing prediction methods are inaccurate and cannot be quantitatively analyzed

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  • Method for predicting service life of structural concrete under erosion of sulfate environment
  • Method for predicting service life of structural concrete under erosion of sulfate environment
  • Method for predicting service life of structural concrete under erosion of sulfate environment

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[0033] The present invention will be further described below in conjunction with the accompanying drawings.

[0034] The invention discloses a method for predicting the service life of structural concrete under sulfate environment erosion. The specific process is as follows:

[0035] On a macro scale, saturated concrete can be considered as a homogeneous cement-based material. For concrete exposed to sulfate environment for a long time, sulfate ions in the external environment diffuse into the interior of the concrete driven by the concentration gradient difference, and this process is a macroscopic ion diffusion behavior. The sulfate ion that diffuses into the concrete can be divided into two parts, one part is freely distributed in the concrete in a free state, and the other part will be dissipated by chemical reaction with cement hydration products. Therefore, the diffusion behavior of sulfate ions in saturated concrete is an unsteady process. According to Fick's law and t...

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Abstract

The invention discloses a method for predicting the service life of structural concrete under sulfate environment erosion, which comprises the following steps: based on the Fick's second law and the law of conservation of mass, solving a sulfate transmission constitutive equation by adopting an alternating implicit finite difference method to meet unconditional convergence conditions, and performing programming and calculating by using MATLAB (Matrix Laboratory) software, and achieving analogue simulation and life prediction of the transmission process of sulfate ion erosion in the concrete. The method is accurate in calculation, high in stability and high in efficiency, and based on the Fick law and the chemical reaction kinetics theory, the diffusion-reaction model of the sulfate ions in the concrete structure with the boundary moving and the calculation method of the erosion product generation amount are achieved.

Description

technical field [0001] The invention relates to concrete life prediction, in particular to a method for predicting the life of structural concrete under sulfate environment erosion. Background technique [0002] Concrete structures that have been in the sulfate environment for a long time suffer from mechanical damage caused by external loads and chemical corrosion caused by the service environment. Among them, sulfate ions in the environment enter the concrete through diffusion and react with cement hydration products to form expansive erosion products such as gypsum and ettringite. The chemical damage caused by sulfate attack on concrete will not only cause the deterioration of mechanical properties such as strength, elastic modulus and ultimate strain of concrete materials, but also cause macroscopic damage such as volume expansion, cracking and spalling of concrete structures. Therefore, in order to quantitatively characterize the degree of damage to concrete materials ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/23G06Q10/04G06F119/04
CPCG06F30/23G06Q10/04G06F2119/04
Inventor 蒋金洋陈泽曹彤宁王赟程
Owner SOUTHEAST UNIV
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