Autogenous shrinkage of different types of cement and different types of admixtures at early ages

Title: Autogenous shrinkage of different types of cement and different types of admixtures at early ages
Author(s): H. Mitani, J.-P. Bournazel, N. Rafaï
Paper category : conference
Book title: International RILEM Conference on Early Age Cracking in Cementitious Systems
Editor(s): K. Kovler and A. Bentur
Print-ISBN: 2-912143-29-2
e-ISBN: 2351580362
Publisher: RILEM Publications SARL
Publication year: 2003
Pages: 115 - 122
Total Pages: 8
Nb references: 7
Language: English

Abstract: Autogenous shrinkage of concrete is nothing else than a reduction of volume due to hydration of the cement paste. Any other causes such as desiccation, temperature changes or external loading influence this phenomenon.

The autogenous shrinkage is a physical consequence of self desiccation and of the so called Le Chatelier’s contraction which is a well known phenomenon. This shrinkage induces self stresses in the cement paste. These stresses are not negligible especially for high performance concrete. In most of the previous researches, measurement of autogenous shrinkage ceased after 24 hours, and therefore ¾ of the total shrinkage is not measured. We have developed, in the laboratory, a new experimental device to measure the volumetric variation from the end of mixing to three days. In this paper, we present the first results obtained on one composition of concrete with different types of cement and different types of superplasticizers.

Online publication: 2010-06-02
Publication type : full_text
Public price (Euros): 0.00