Early chemical shrinkage due to dissolution and hydration of cement

New investigations into very early volume change of aqueous cement dispersions allow us to understand better what is meant by the general term 'chemical shrinkage'. In fact, early chemical shrinkage should be subdivided into dissolution shrinkage and hydration shrinkage, the latter taking...

Full description

Saved in:
Bibliographic Details
Published in:Materials and structures 2001-06, Vol.34 (5), p.279-283
Main Authors: Beltzung, F, Wittmann, F H
Format: Article
Language:English
Subjects:
Building construction
Building materials
Cement
Cements
Civil engineering
Classification
Dispersions
Dissolution
Hydration
Mortars
Shrinkage
Straight lines
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:New investigations into very early volume change of aqueous cement dispersions allow us to understand better what is meant by the general term 'chemical shrinkage'. In fact, early chemical shrinkage should be subdivided into dissolution shrinkage and hydration shrinkage, the latter taking place before as well as after the induction period. Shrinkage is evaluated by picnometry and by linear measurement carried out in three directions by means of an experimental set-up specially built to measure endogenous shrinkage right from the time after mixing. As expected, the volume of dissolved cement is a function of w/c-ratio, whereas the volume of early hydrated cement is independent of w/c-ratio. This relation, is linear and the slope as well as the intersection of the straight line with the ordinate vary depending on the cement composition. Therefore, these values may be considered to be indicating characteristic cement properties. In this way it becomes possible to classify cements and to predict the extent of early chemical shrinkage of mortar and concrete by just knowing their w/c-ratio.[PUBLICATION ABSTRACT]
ISSN:1359-5997
1871-6873
DOI:10.1007/BF02482207