Dissertation > Excellent graduate degree dissertation topics show

Durability Study of Concrete Structures Based on Chloride Ingress

Author: ZhaoXiangYu
Tutor: HuangZuoZuo
School: Chongqing University
Course: Civil Engineering
Keywords: concrete durability chloride ion randomness life prediction
CLC: TU528
Type: Master's thesis
Year: 2011
Downloads: 215
Quote: 0
Read: Download Dissertation

Abstract


Concrete structures often causes the corrosion of steel bar due to erosion of chloride ion, thus the structural behavior is degenerated and the carrying capacity is reduced and even the structure is destroyed. In this connection, it is a must to spend a lot of money and natural resources on maintenance and reconstruction. Thus huge economic loss and sever social influence are caused to the state. This paper performs the following research work with focus on the problem of durability of the concrete structures if eroded by chloride ion by taking the initial corrosion durability life of steel bars in concrete as the mainline from three perspectives of numerical simulation method for predicting chloride ion concentration distribution in concrete, numerical model of predicting chloride ion concentration in concrete as well as probabilistic method for predicting durability life of the concrete structure:By utilizing the similarity of differential equation for unsteady state heat conduction & energy conservation in concrete with differential equation for unsteady state diffusion & mass conservation of chloride ions in concrete based on Fick’s law and having rational equivalence of each parameter of the equations, propose a finite element numerical simulation method for predicting two-dimensional distribution of chloride ion in concrete based on the thermal analysis module in ANSYS and verify the effectiveness of this method through comparison to the analytic solutions. Study the influence law of diffusion coefficient, diffusion time, chloride ion concentration on the surface, sectional dimension of the constructional element, existence, diameter and space of steel bars on the two-dimensional diffusion of chloride ion in concrete.Revise diffusion coefficients of chloride ion by introducing various parameters based on the foregoing finite element numerical simulation method, establish the numerical module of chloride ion diffusion in concrete under the influence of many factors, discuss the parameters of the module in great detail and give law of taking value for each parameters. Simulate an engineering case by application of the numerical model and verify the practicability of the model through comparison of the simulation value to the experimental value.Based on the foregoing numerical model with the critical concentration that the chloride ion concentration on the surface of the steel bar as the symbol of the termination of durability life and in view the randomness of standard diffusion coefficient of chloride ion, thickness of the protective layer chloride ion concentration on the surface and the critical concentration of chloride ion, based on the PDS in ANSYS establish reliability-based numerical method for calculating the expected value of durability life of the concrete structure and failure probability of durability, then analyze the influence law of the statistical characteristic of each parameter on durability life by application of this method.

Related Dissertations

  1. Analysis and Study of Abutment Stability in Concrete High Arch Dam by Three-Dimensional Nonlinear Finite Element Method,TV642.4
  2. Partical Combination of Fine Powder Effect on Performance of Cement and Concrete,TU528.041
  3. The Studies and Establishment of Ready-mixed Concrete Information-guided Price on the Basis of Risk Analysis,F407.92
  4. Rock-fill Concrete Experiments on Comprehensive Properties and Studies on Thermal Stress,TU528
  5. Experimental Study of Porous Composite Materials on the Base of Recycled Concrete Powder-Cement,TU528
  6. The Experimental Research on Regeneration Aggregate and Proportioning of Recycled Concrete Brick,TU528
  7. Experiments on Microwave Radiation Activation YunNan Unburned Coal-gangue Concrete,TU528
  8. Recycled aggregate semi- rigid concrete preparation and molding of test,TU528
  9. Analysis of Concrete Durability under Combined Action of Freeze-thaw Cycles and Chloride Ion Erosion,TU528
  10. The Research of Concrete Shrinkage and Creep Experiment,TU528
  11. Studies on Changes of Quality Characters and Prediction Model of Postharvest Tomato Fruit,S641.2
  12. The Research on the Effect of Uniaxial Compressive Load and Mineral Admixtures on Chloride Permeability of Concrete,TU528
  13. Research on Mechanical Properties of Concrete with Multi-Component Admixture,TU528
  14. Dynamic Simulation and Fatigue Durability Analysis of Wheel Loader Worktool,TH243
  15. Durability Research of Service Concrete,TU528
  16. The Study on Rock Mass Stregnth Randomenss and Reliabilityof Slope,TD854.6
  17. Application of Low Elastic Modulus Concrete in Dam Cutoff Wall,TV543.8
  18. Study on the Performance of Double-combined with Mineral Admixture Concrete and Prediction Model of Compressive Strength,TU528
  19. A Study on Early-age Shrinkage of Concrete and Cement Paste,TU528
  20. The Mechanical Analysis of Roller Linear Guideway,TG502.3
  21. Coupling Analysis on the Reinforcement of Earth-rock Dam in Seepage Field and Stress Field,TV139.2

CLC: > Industrial Technology > Building Science > Building Materials > Non-metallic materials > Concrete and concrete products
© 2012 www.DissertationTopic.Net  Mobile