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Thursday, August 6, 2020 | History

7 edition of Diffusion of chloride in concrete found in the catalog.

Diffusion of chloride in concrete

theory and application

by Leif Mejlbro

  • 341 Want to read
  • 5 Currently reading

Published by Taylor & Francis in New York .
Written in English

    Subjects:
  • Concrete -- Deterioration,
  • Reinforced concrete -- Deterioration,
  • Concrete -- Effect of salt on

  • Edition Notes

    Includes bibliographical references and index.

    StatementLeif Mejlbro, Ervin Poulsen.
    SeriesModern concrete technology ;, 14
    ContributionsPoulsen, Ervin.
    Classifications
    LC ClassificationsTA440 .M394 2005
    The Physical Object
    Paginationp. cm.
    ID Numbers
    Open LibraryOL3426880M
    ISBN 100419253009
    LC Control Number2005050889

      Abstract. Recycled aggregate concrete (RAC) specimens with different recycled coarse aggregate replacement ratios by mass (R) are fully immersed in a 10% chloride solution for free chloride concentration (C f) and total chloride concentration (C t) are then measured employing a rapid chloride test (RCT) Fick’s second diffusion law is verified by the test Cited by: The apparent chloride diffusion coefficient is commonly used in chloride ingress models based on Fick's second law of diffusion. The apparent diffusion coefficient determined by this method includes bound chloride, so proper use of the apparent chloride diffusion coefficient to predict chloride ingress requires consideration of chloride.

    Abstract. In the present paper, an analysis of the diffusion behavior of chloride ions in concrete is presented. In concentrated electrolytic aqueous solutions such as seawater or that typically used in laboratory experiments, the effect of ionic interaction may significantly reduce the chemical potential and thus the driving force of the diffusing species. Bibliography Books Chloride Penetration into Concrete, Eds. J.P. Ollivier and L.O. Nilsson, RILEM, Articles. Spinks, J.W.T., Baldwin, H.W., and Thorvaldson, T.

    A Simple Approach to Modeling Chloride Diffusion into Cracked Reinforced Concrete Structures. Thuy Ninh Nguyen, Hoang Quoc Vu * Building Materials Lab., Faculty of Civil Engineering, Ho Chi Minh City University of Technology, Viet Nam. Abstract. Up to now, several models of chloride ingress in concrete and cracked concrete have been proposed. Chloride Diffusion: A Brief Review of the Underlying Theory Chloride diffusion into concrete, like any diffusion process, is controlled by Fick’s First Law, which, in the one-dimensional situation normally considered, states: J D dC eff dx = − (1) where J is the flux of chloride ions, DFile Size: KB.


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Diffusion of chloride in concrete by Leif Mejlbro Download PDF EPUB FB2

This book is the most comprehensive and flexible theory of chloride ingress in concrete to date. Based on test results and field observations, the book demonstrates the easy application of this theory to practice.

The information is presented in a clear style with each chapter Diffusion of chloride in concrete book an introduction, technical applications and examples, and a fCited by: This book is the most comprehensive and flexible theory of chloride ingress in concrete to date.

Based on test results and field observations, the book demonstrates the easy application of this theory to practice. The information is presented in a clear style with each chapter containing an introduc.

This book is the most comprehensive and flexible theory of chloride ingress in concrete to date. Based on test results and field observations, the book demonstrates the easy application of this theory to practice.

The information is presented in a clear style with each chapter containing an introduction, technical applications and examples, and a final section covering the mathematics behind.

CONCEPTS ON THE CHLORIDE DIFFUSION COEFFICIENT C. Andrade Institute of Construction Science “Eduardo Torroja”, CSIC, Madrid, Spain Abstract Diffusion coefficient D, is considered the rate determining parameter of chloride ingress in concrete.

In the paper D is defined following Crank and emphasis is made in thatFile Size: KB. This volume presents a comprehensive and flexible theory of chloride ingress in concrete. Based on test results and field observations, the book demonstrates the easy application of this theory to practice.

Poursaee, in Sensor Technologies for Civil Infrastructures, Chloride induced corrosion. Chloride ions can be present in the concrete due to the use of chloride-contaminated components or the use of CaCl 2 as an accelerator when mixing the concrete, or by diffusion into the concrete from the outside environment (Thuresson, ).A localized breakdown of the passive layer occurs.

1 Determination of the concrete chloride diffusion coefficient based on an electrochemical test and an optimization model Juan Lizarazo-Marriagaa, Peter Claisseb a,b Departamento de Ingeniería Civil, Universidad Nacional, Bogotá, Colombia.

[email protected] b Materials Applied Research Group, Coventry University COV 5FB, [email protected] "Diffusion of Chloride in Concrete: Theory and Application presents the most comprehensive and flexible theory of chloride ingress in concrete to date.

Based on test results and field observations, the book demonstrates the easy application of this theory to practice."--Jacket. An attempt is made to replace partially GGBS for cement in concrete of M20 & M25 grades and study its Chloride diffusion.

GGBS is replaced for cement in the level of 10%, 20%, 30%, 40%, 50% and 60%. The study results showed that, with the increase in percentage of GGBS, the. The depth of chloride penetration into concrete made with pulverised-fuel ash was less than into Portland cement concrete, although the difference was marginal when high-quality mixes were compared.

Oxygen diffusion rates measured on standard-grade Portland cement concrete cured in air or with sea water were substantially lower for the. Diffusion of chloride in concrete - theory and application.

Product code: SPON Primarily aimed at practising engineers engaged in analysis and design of concrete structures exposed to a chloride laden environment, this book is also a useful reference for mathematicians and engineering students.L.

Mejlbro, Technical University of Denmark. (source: Nielsen Book Data) Summary This book is the most comprehensive and flexible theory of chloride ingress in concrete to date. Based on test results and field observations, the book demonstrates the easy application of this theory to practice.

This book is the most comprehensive and flexible theory of chloride ingress in concrete to date. Based on test results and field observations, the book demonstrates the easy application of this theory to practice. The information is presented in a. concrete has hardened, the diffusion of chloride ions is predomi-nantly controlled by the composition and microstructure of the concrete.

Diffusion of chloride is a time-dependent process. It will decrease with time since the capillary pore system will be altered as hydration products continue to form.

In addition to this, some chloride ions. The diffusion of chloride ions is one of the main factors that arouses steel corrosion in concrete. In this paper, a two-dimension cellular automaton (CA) model was developed to simulate the diffusion process of chloride ions in concrete.

Keywords: chloride diffusion; modeling; surface chloride concentration. Date: 9/1/ Abstract: Mathematical models are derived to predict chloride diffusion in concrete with an initial exposure period having a linear increase of surface chloride and decreasing diffusivity, and subsequent periods with a decreasing or constant by: 9.

of chloride transport is the diffusion which takes place under a concentration gradient. If the outside chloride concentration is higher than the inside of concrete, the migration of chloride ions through pore water in concrete will take place by diffusion.

The relative importance of the two major mechanisms of chloride transport, namely diffusion. The purpose of the present study is, therefore, to study the effects of reinforcement on the chloride diffusion in concrete structures by incorporating realistic diffusion models.

To this end, the nonlinear binding isotherm that includes the effects of cement types and mixture proportion has been introduced in the chloride diffusion by: Chloride diffusivity of concrete cracked in flexure Article (PDF Available) in Cement and Concrete Research 30(5) May with Reads How we measure 'reads'.

Chloride ingress into reinforced concrete sustaining in-service loads: A study trying to relate chloride diffusion coefficient to stresses or bending moments in concrete subjected to loads [Amre Deif] on *FREE* shipping on qualifying offers. The objectives of this study were to investigate the effect of sustained load on chloride ingress into concrete and to examine the reliability Cited by: 1.

In the saline environment, chloride ions diffusion depth in concrete is very important for predicting the service life of concrete structures. Moreover, concrete structures are not always crack-free.

Cracks with different widths and depths will reduce the cover thickness and accelerate the migration of chloride ions.Using experimental results of chloride penetration depth, the apparent chloride diffusion coefficient of sound concrete is calibrated as −12 m 2 /s, which is in the range for concretes and mortars made with the different cementitious systems (from 1 −12 to 5 −11 m 2 /s).

The contour of free chloride concentration and chloride penetration depth at 8 weeks and 20 weeks are shown in Cited by: 4.After concrete has hardened, the diffusion of chloride ions is predom-inantly controlled by the composition and microstructure of the concrete. Diffusion of chloride is a time dependent process.

It will decrease with time since the capillary pore system will be altered as hydration products continue to form.

In addition to this, some chloride.