The Modelling of Microstructure and its Potential for Studying Transport Properties and Durability / Edition 1

by H. Jennings, Jïrg Kropp, Karen Scrivener

Overview

From July 10th through July 13th, 1994, an informal workshop co-organized by RILEM committees 116-PCD and 123-MME was held at Saint-Remy-Ies­ Chevreuse, France, and attended by 38 delegates from 16 countries. Twenty-nine papers were presented, converging the general subjects of modelling micro­ structures and predicting durability of concrete and other cement-based materials. A short summary follows: G. M. Idom's paper entitled "Modelling Research for Concrete Engineering" serves as an introduction to the workshop, presenting an overview of modelling research with the conelusion that the broad practica1 objective is to produce high-quality concrete. This means that many characteristics, ranging from rheology to alkali-silica reaction, must be modelled. In other words, the system must be understood. Idom's paper sets the stage for papers in two general areas: 1) models and 2) transport properties. After this, abrief survey of the development of microstructurally-based models is presented. A elose relationship between computer power and speed is suggested. The first group of papers on models covers the subjects of scale and resolution. Most models define and predict characteristics of the pore system, which range in scale from nanometer to millimeter. Various types ofnetworks are proposed in these papers. A good microstructural model must describe the pores and other phases at ascale appropriate to the properties that the model predicts. Also, a good model should be based on fundamental knowledge. In the case of cement-based materials, the important properties may depend on the microstructure, especially the porosity, at several scales.

Product Details

ISBN-13:	9780792338529
Publisher:	Springer Netherlands
Publication date:	12/31/1995
Series:	NATO Science Series E: , #304
Edition description:	1996
Pages:	558
Product dimensions:	6.14(w) x 9.21(h) x 0.36(d)

Table of Contents

Modelling Research for Concrete Engineering.- Modelling and Materials Science of Cement-Based Materials Part I: An Overview.- At What Scale Do Homogeneous Phenomena Become Localized: The Necessary and Sufficient Magnification.- Models for Prediction of Microstructural Development in Cement-Based Materials.- Multiscale Models: A Tool to Describe the Porosity of Cement-Based Materials and to Predict Their Transport Properties.- A Scaling Model of the Microstructural Evolution in C3S/C-S-H Pastes.- Effect of Mineralogy of Fillers on the Cement Hydration.- Application of Digital-Image-Based Models to Microstructure, Transport Properties, and Degradation of Cement-Based Materials.- Modelling and Materials Science of Cement-Based Materials Part II: Recent Developments.- Simulation of Effects of Small Inert Grains on Cement Hydration and Its Contact Surfaces.- Texture and Moisture Characterization of Hardened Cement Pastes and Concretes from Water Vapour Sorption Measurements.- Influence of Silica Fume on the Pore Structure of Mortar When Measured by Water Vapour Sorption Isotherms.- Expert Systems and Database Systems.- Transport Mechanisms in Porous Materials—An Introduction to Their Basic Laws and Correlations.- Relationships Between Transport Properties and Compressive Strength of Concrete.- Effects of Curing on the Gas Permeability of Cover Concrete.- Effect of Ageing on Pore Structure and Permeability of Cementitious Materials.- Permeability and Sorptivity Response of Concretes to Variations in Early-Age Curing—Implications for Durability Specifications.- Correlation Between the Transport Properties of the Transition Zone and Its Mineral Composition and Microstructure.- Modified Microstructure via Chemical Activation of Ferrite and Aluminate Phases in PortlandCement-Based Formulations-Repartition of Crystalline and Noncrystalline Phases vs. Cementitious Properties.- Influence of Environmental Parameters Upon Permeation in Concrete.- Neural Networks for Predicting the Deterioration of Concrete Structures.- Effect of Moisture Content on the Porosity and Transport Parameters of Concrete.- Effect of Moisture in Concrete on Fluid Absorption.- Corrosion Mechanisms of Concrete and Their Relevant Transport Processes.- Durability Design Based on Models for Corrosion Rates.- Prediction of Service Life of New and Existing Concrete Structures — On the Need for Models and Materials Parameters.- Predicting the Service Life of Concrete Exposed to Frost Action Through a Modelling of the Water Absorption Process in the Air-Pore System.- A Numerical Method for Prediction of Chloride Penetration Into Concrete Structures.- Decreasing the Penetration of Organic Liquids Into Concrete by Using Active Additions.