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Proceedings pro013 : 2nd International RILEM Symposium on Hydration and Setting


Title: 2nd International RILEM Symposium on Hydration and Setting
Edited by A. Nonat
ISBN: 2-912143-16-0
e-ISBN: 2351580281
Pages: 438
Publication date: 1997

Comparatively to the considerable number of works devoted to hydration and to the microstructure development in cement paste, those dealing with the fundamental mechanisms of setting are very few. Nevertheless, setting that marks, at the macroscopic state, the passage from the soft state to the hard state of the paste has a capital importance on the practical point of view and users are increasingly aware that final properties of the concrete is depending on characteristics of the paste at early age. The growing interest of the engineers for rheological measurements are a proof. On the other hand, the improvement of concrete performances is practically limited currently to two parameters, the porosity and the quantity of hydrates formed at a time t. To find new means of action necessitates to know processes at the origin of the paste cohesion from mixing to setting and hardening.
From a more microscopic point of view, setting concerns the early formation of a three dimensional network and its initial development of strength. It occurs during early hydration stage of cement paste or other mineral binders while the paste is still a dense suspension of particles in which different processes are involved such as electrokinetic processes, percolation, nucleation and growth of new phases...The understanding of the exact relation between the pure chemical evolution, hydration, and the cohesion emergence requires the mastery of concepts from different fields of science and so an interdisciplinary approach. It is the reason why, under the impetus of ATILH (French Technical Association of Industries of Hydraulic Binders) and Jacques Baron especially, the first workshop was organised in 1991 to promote the discussion between experts of cement chemistry and experts of colloid science.
These discussions with colloid scientists about particle interactions occurring during the early age were very fruitful. Following the successful first workshop, several French teams of physicists and physico-chemists have begun to be interested in the fundamental problems related to setting. On the other hand, more and more researchers and engineers worldwide are concerned with the evolution of the properties of cement or other mineral binders during the workability period. As a consequence, this second edition focused more on setting problem.

Three essential points have been covered balancing the theoretical approach and the practical aspects:
- the fundamental principles allowing to understand the origin of setting and identify the
relevant parameters,
- methodologies and experimental techniques leading to a better description of the system,
- the influence of relevant parameters on the evolution of systems of practical interest.

The Proceedings are arranged in four parts:
- interparticular interactions : from swelling to setting,
- fundamental mechanisms of adhesion. Relevance to particle interactions, sticking and
aggregation in a fluid medium,
- crystallisation concepts in aqueous solutions : influence of solubility and composition of
solution on nucleation and growth,
- rheology of pastes: systemic rheology : a new tool for the study of hydration and setting of
cement pastes.


Contents


Preface - Concrete: the new frontier is at the molecular level
Author(s): J. Baron
Pages: XI - XIV

Introduction
Author(s): A. Nonat, J.C. Mutin
Pages: XV - XVI

Part 1: Particle interactions at the origin of setting


Fundamental mechanisms of adhesion: relevance to particle interactions, sticking and aggregation in a fluid medium
Author(s): H. Haidara
Pages: 3 - 22

Can water be the glue?
Author(s): P. Acker, V. Baroghel-Bouny, S. Garcia
Pages: 23 - 36

Electrostatic interparticle forces: from swelling to setting
Author(s): A. Delville
Pages: 37 - 61

A (NVT) Monte-Carlo study of the stability of charged interfaces, application to cement and clay minerals
Author(s): R.J.-M. Pellenq, M. Crespin, N. Lequeux, C. Menager, L. Costalin, A. Delville, J.-M. Caillol, H. van Damme
Pages: 63 - 86

Use of osmotic pressure measurements in studying interactions in calcium silicate hydrate gels
Author(s): J. Persello, A. Jacquet, A. Pantaleo, B. Cabane
Pages: 87 - 100

Electrokinetic properties of C-S-H; relation with coagulation process
Author(s): L. Nachbaur, P.C. Nkinamubanzi, A. Nonat, J.C. Mutin
Pages: 101 - 115

Study of forces between microcrystals of gypsum by atomic force microscopy
Author(s): E. Finot, E. Lesniewska, J.P. Goudonnet
Pages: 117 - 134

Cohesion of agglomerated gibbsite (AI(OH)3) crystals
Author(s): I. Seyssiecq, S. Veesler, R. Boistelle
Pages: 135 - 142

Part 2: Nucleation, growth and properties of the crystallisation contact phase


Crystallization concepts in aqueous solutions: influence of solubility and composition of solution on nucleation and growth processes
Author(s): S. Veesler, R. Boistelle
Pages: 145 - 159

Factors influencing the nucleation and growth of the hydrates in cementitious systems: an experimental approach
Author(s): D. Damidot, D. Sorrentino, D. Guinot
Pages: 161 - 197

Experimental study and simulation of C-S-H nucleation and growth
Author(s): S. Gauffinet, E. Finot, A. Nonat
Pages: 199 - 214

Crystallinity in C-S-H gels: influence of preparation and cure conditions
Author(s): S. Gauffinet, E. Finot, A. Nonat
Pages: 215 - 225

Setting and microporosity of reactive powder concrete: proton nuclear relaxation and high resolution solid NMR studies
Author(s): S. Philippot, J.P. Korb, D. Petit, G. Counio, H. Zanni, V. Maret
Pages: 227 - 233

Chemically modified hydration of Portland cement and its implication for the kinetics of the hydration of ordinary Portland cement
Author(s): W. Schwarz, K. Sujata, H.M. Jennings, A. Gerdes, F.H. Wittmann
Pages: 235 - 253

Part 3: Rheology of cement pastes, properties and tools


Systemic rheology: a new tool for the study of hydration and setting of cement pastes
Author(s): L. Choplin
Pages: 257 - 269

Rheological changes associated with cement setting
Author(s): L.J. Struble, G.-K. Sun
Pages: 271 - 280

Dynamic mode rheology of cement pastes
Author(s): L. Nachbaur, A. Nonat, J.C. Mutin, L. Choplin
Pages: 281 - 293

Modelling the development of the elastic moduli as a function of the hydration degree of cement pastes and mortars
Author(s): A. Boumiz, D. Sorrentino, C. Vernet, F. Cohen Tenoudji
Pages: 295 - 316

Study of the viscoelastic behaviour of cement pastes at early ages with ultrasonic waves in echographic mode
Author(s): V. Morin, F. Cohen Tenoudji, C. Vernet
Pages: 317 - 327

Determination of viscosity changes of cement paste with a smart lamb-wave sensor system
Author(s): A. van Beek, A. Fransen, M.J. Vellekoop, K. van Breugel, A. Bosman
Pages: 329 - 338

Rheological monitoring of superplasticizers adsorption on reactive powder concrete (RPC)
Author(s): O. Bonneau, C. Vernet, M. Moranville, L. Moindrot
Pages: 339 - 351

Recent development on chemical shrinkage and setting properties using ultrasonic pulse
Author(s): Å. Rettvin
Pages: 353 - 361

Dispersion mechanism in processing in cement paste
Author(s): H. Matsuyama, J.A. Lewis, J.F. Young
Pages: 363 - 374

Part 4: Setting and properties of hardening mineral binders


Crystallization and mechanical properties of set plaster
Author(s): E. Badens, E. Garcia, S. Veesler, R. Boistelle
Pages: 377 - 389

Setting and hardening of gypsum-cement materials
Author(s): K. Kovler
Pages: 391 - 401

The influence of K2SO4 on action of superplasticizers and properties of cement paste and mortar
Author(s): W. Kurdowski, S. Grzeszczyk
Pages: 403 - 415