Some aspects of cement chemistry regarding self-compacting concrete

Title: Some aspects of cement chemistry regarding self-compacting concrete
Author(s): J. Stark
Paper category : conference
Book title: SCC'2005-China: 1st International Symposium on Design, Performance and Use of Self-Consolidating Concrete
Editor(s): Zhiwu Yu, Caijun Shi, Kamal Henri Khayat and Youjun Xie
Print-ISBN: 2-912143-61-6
e-ISBN: 2912143624
Publisher: RILEM Publications SARL
Publication year: 2005
Pages: 237 - 244
Total Pages: 8
Nb references: 6
Language: English

Abstract: The rheological behaviour of SCC during the very first hours of hydration is influenced by the formation of syngenite and ettringite and consequently depends on the alkali- and sulfate content of the liquid phase. The probability of phase formations was determined by thermodynamic calculations.
Powdered limestone and fly ash as well acting as nucleation sites for C-S-H. Hence, the early stage of hydration is accelerated and the retarding effect of several superplasticisers is partially compensated. Due to the slow hydration of fly ash of merely 10 % after 3 month, for SCC with high fly ash content durability testing procedures should be carried out at later ages than intended for normal concretes.

Online publication: 2005-04-11
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143624.024