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Proceedings pro002 : International RILEM Workshop on Chloride Penetration into Concrete Saint-Rémy-lès-Chevreuse, France (1995)


Title: International RILEM Workshop on Chloride Penetration into Concrete
Saint-Rémy-lès-Chevreuse, France (1995)
Edited by L.-O. Nilsson and J.-P. Ollivier
ISBN: 2-912143-00-04
e-ISBN: 2912143454
Pages: 496
Publication date: 1995

Chloride penetration into concrete is one of the most decisive processes for durability and service-life of concrete structures. Design for durability of new structures, and maintenance and repair of existing structures, requires a correct understanding and quantification of the processes involved.


Throughout the world, much work has been done and is going on, but still we cannot predict the penetration process with any accuracy. On the contrary, recent findings show that a larger lack of knowledge exists than expected only a few years ago. At numerous international conferences and in papers published in journals, it seems that only more data is added but that very little new knowledge is gained. Improved discussion and cooperation, between researchers, as well as between researchers and engineers, may push development in a fruitful direction. This book is proposed to take a first step in this direction.


Contents


Foreword and Introduction
Pages: XIII - XV

Session 1: Chloride Binding


The determination of chloride binding relationships
Pages: 3 - 9

Quick method to determine free and bound chlorides in concrete
Pages: 10 - 16

Chloride penetration - non destructive determination of the free chloride content in mortar and concrete
Pages: 17 - 26

Effect of type of aggregate, temperature and drying/rewetting on chloride binding and pore solution composition
Pages: 27 - 35

Chloride binding isotherms - An approach by applying the modified BET equation
Pages: 36 - 42

An original method to determine the non linear chloride binding isotherm from bulk specimens of mortar
Pages: 43 - 50

Session 2. Steady state chloride diffusion


Diffusion behaviour of chloride ions in concrete
Pages: 53 - 63

On the non-applicability of unmodified Fick's laws to ion transport through cement based materials
Pages: 64 - 73

Evidence of the concentration dependent ionic diffusivity through saturated porous media
Pages: 74 - 76

Steady-state diffusion characteristics of cementitious materials
Pages: 77 - 84

Multi-scale modelling of the diffusivity of mortar and concrete
Pages: 85 - 94

Fundamentals of migration experiments
Pages: 95 - 104

An electrochemical method for accelerated testing of chloride diffusivity in concrete
Pages: 105 - 114

Rapid determination of chloride diffusivity in concrete with blending agents
Pages: 115 - 125

On chloride diffusion coefficients obtained by using the electrically accelerated methods
Pages: 126 - 134

Comparison of AASHTO T-277 (electrical) and AASHTO T-259 (90d ponding) results
Pages: 135 - 149

Determination of chloride diffusion coefficient using two different steady-state methods : influence of concentration gradient
Pages: 150 - 160

The effect of concentration on the accelerated chloride ion migration test for modified concretes
Pages: 161 - 168

Session 3: Non-steady state chloride transport


A non-parametric method for estimation of the diffusion coefficient of chloride in concrete
Pages: 171 - 181

Modelling of skin effects on diffusion processes in concrete
Pages: 182 - 194

A new approach to the analysis of time-dependent changes in chloride profiles to determine effective diffusion coefficients for use in modelling of chloride ingress
Pages: 195 - 205

A Windows program for the prediction of chloride penetration into submerged concrete
Pages: 206 - 215

Non-steady state chloride transport in modified concretes
Pages: 216 - 224

Chloride diffusion and resistivity testing of five concrete mixes for marine environment
Pages: 225 - 233

The effect of some test variables on chloride profiles
Pages: 234 - 242

Chloride penetration into cracked concrete
Pages: 243 - 249

Influence of the loading on the penetration of chlorides in reinforced concrete
Pages: 250 - 262

Session 4: Combined transport processes


Mixture theory applied to chemical reactions and diffusion of different mediums in mature concrete ; A hypothetical model, part I
Pages: 265 - 278

Mixture theory applied to chemical reactions and diffusion of different mediums in mature concrete ; A hypothetical model, part II
Pages: 279 - 289

Experimental investigations on binding of chloride and combined effects of moisture and chloride in cementitious materials
Pages: 290 - 301

Experimental results concerning combined transport of humidity and chloride in non steady state
Pages: 302 - 314

Chloride transport due to wick action in concrete
Pages: 315 - 324

Penetration of chlorides into concrete - Phenomena and consequences
Pages: 325 - 333

Chloride penetration due to the hydratation suction of the cement
Pages: 334 - 344

Session 5: Chloride environments


Chloride profiles in concrete repair materials
Pages: 347 - 355

Description of exposure to chloride of marine concrete strutures
Pages: 356 - 372

Session 6: Chloride profiles in concrete structures


Chloride penetration into concrete exposed to severe marine environment
Pages: 373 - 380

Chloride penetration results for several prestressed- concrete motorway viaducts in Slovenia
Pages: 381 - 387

Issues related to recent developments in service life specifications for concrete structures
Pages: 388 - 397

Practical non-steady state chloride transport as a part of a model for predicting the initiation period
Pages: 398 - 406

Design of rebar concrete covers in marine concrete structures. Deterministic approach
Pages: 407 - 416

Design of rebar concrete covers in marine concrete structures Probabilistic approach
Pages: 417 - 426

Session 7: Chloride threshold level


Chloride threshold levels for corrosion induced deterioration of steel in concrete
Pages: 429 - 440

Time to depassivation depending on concrete composition and environmental conditions
Pages: 441 - 452

Critical chloride concentrations for the onset of active reinforcement corrosion
Pages: 453 - 459

A proposed technique for determining chloride thresholds
Pages: 460 - 469

The importance of chloride diffusion
Pages: 470 - 480