Internal post-curing of hydrating cement pastes of high performance concretes studied by low-field NMR relaxometry

Title: Internal post-curing of hydrating cement pastes of high performance concretes studied by low-field NMR relaxometry
Author(s): Karen Friedemann, Frank Stallmach, Nikolaus Nestle, Jörg Kärger
Paper category : conference
Book title: International RILEM Conference on Volume Changes of Hardening Concrete: Testing and Mitigation
Editor(s): O. M. Jensen, P. Lura, K. Kovler
Print-ISBN: 2-35158-004-4
e-ISBN: 2351580052
Publisher: RILEM Publications SARL
Publication year: 2006
Pages: 147 - 155
Total Pages: 9
Nb references: 20
Language: English

Abstract: The internal post-curing of hydrating white and ordinary Portland cement pastes of high performance concretes prepared with an initial water-to-cement ratio of 0.25 is studied by non-destructive low-field NMR relaxometry. As water source for the internal post-curing, a polyelectrolyte gel is used. By analysing the distribution of the transverse relaxation times of the water obtained from the NMR measurements, the water transition from the gel material added as internal water source into the hydrating cement pastes is observed. The water consumptions of different cement pastes are estimated. Additionally, the hydration progress in the cement paste is qualitatively monitored by studying the dependence of the amount of the physically bound water as function of hydration time. Based on this experimental data, the influence of superplasticizer and microsilica additives on the hydration progress and the water transition by internal post-curing is discussed.

Online publication: 2006-07-30
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2351580052.016