Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for calculating depassivation time of concrete reinforcing steel bar based on GEM equation

A technology of concrete reinforcement and calculation methods, applied in design optimization/simulation, instruments, electrical digital data processing, etc., can solve the problems of not considering the influence of effective diffusion index of pore characteristics, inaccurate calculation results, etc.

Active Publication Date: 2020-10-20
HOHAI UNIV +2
View PDF4 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Purpose of the invention: the purpose of this invention is to provide a kind of calculation method based on the depassivation time of the concrete reinforcement of GEM equation, solve the problem that the calculation result is inaccurate without considering the impact of pore characteristics on the effective diffusion index

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for calculating depassivation time of concrete reinforcing steel bar based on GEM equation
  • Method for calculating depassivation time of concrete reinforcing steel bar based on GEM equation
  • Method for calculating depassivation time of concrete reinforcing steel bar based on GEM equation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0068] The present invention will be further described below in conjunction with the accompanying drawings.

[0069] The calculation method of the depassivation time of the concrete reinforcement based on the GEM equation disclosed by the invention comprises the following steps:

[0070] (1) The general formula for determining the GEM equation according to the general effective medium equation is as follows:

[0071]

[0072] Among them, σ h — is the conductivity of the high conductivity phase in the composite; σ l — is the conductivity of the low-conductivity phase in the composite; σ eff —is the effective conductivity of the composite material; f—is the volume fraction of low conductivity phase; f cri — is the critical volume fraction of the composite material, and n is the parameter index.

[0073] (2) Improve the general formula of the GEM equation of step (1) through the Nernst–Einstein equation, and establish the two-phase chloride ion effective diffusion coeffici...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
porosityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for calculating the depassivation time of a concrete reinforcing steel bar based on a GEM equation. The method comprises the steps of: improving the general formula ofthe GEM equation through a Nernst-Einstein equation; establishing a relation formula between the two-phase chloride ion effective diffusion coefficient of the concrete and the porosity of the concrete; correcting the diffusion index under the influence of multiple factors according to the influence of the curing age, the mineral admixture amount and the fiber admixture amount on the diffusion index n of the relation formula of the effective diffusion coefficient of the two-phase chloride ions and the porosity of the concrete to obtain the corrected effective diffusion coefficient; and calculating to obtain the depassivation time of the concrete reinforcing steel bar according to the obtained corrected effective diffusion coefficient and comprehensive degradation coefficient, the attenuation coefficient of the diffusion coefficient along with time and the chloride ion binding capacity characterization parameter. The invention provides a new method for predicting the effective diffusioncoefficient of the chloride ions influenced by multiple factors, and provides a basis for studying the prediction of the service life of concrete components with different pore characteristics in a chloride ion corrosion environment.

Description

technical field [0001] The invention relates to a method for predicting the service life of steel bars in concrete, in particular to a method for calculating the depassivation time of concrete steel bars based on the GEM equation. Background technique [0002] In civil engineering, the durability research of reinforced concrete structures is an important subject. Durability is affected by many factors, such as freeze-thaw cycle, dry-wet cycle, carbonation of concrete, corrosion of chloride salt and other factors, among which the corrosion of chloride salt occupies a considerable proportion. The essence of cement-based materials is a porous medium material. Whether it is made of concrete or mortar based on cement-based materials, the rich pore structure in it is the main reason for the damage of materials under load and the penetration and erosion of harmful ions. At present, the depassivation of steel bars The calculation of the melting time is based on the one-dimensional ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F119/02
CPCG06F30/20G06F2119/02
Inventor 沈才华陈伟卓文泽许修亮郭丹吕世明唐凯陈晓峰
Owner HOHAI UNIV
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com