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Pro061

Microstructure development during early Portland cement hydration



Title: Microstructure development during early Portland cement hydration
Author(s): S. Brendle, M.R. de Rooij
Paper category : conference
Book title: International Conference on Microstructure Related Durability of Cementitious Composites
Editor(s): W. Sun, K. van Breugel, C. Miao, G. Ye and H. Chen
Print-ISBN: 978-2-35158-065-3
e-ISBN: 978-2-35158-084-4
Publisher: RILEM Publications
Publication year: 2008
Pages: 189 - 197
Total Pages: 9
Nb references: 5
Language: English


Abstract: Two main properties of concrete are most important on the construction site: the setting time and the hardening time. The setting determines the workability and casting period of the mixture. The hardening is responsible for the strength developments and controls the necessary time point to demould concrete.
In this study five different Portland cements were examined by using ultrasonic wave propagation techniques and thermal calorimetry measurements. The aim is to find a better understanding of the early hydration kinetics to enhance the forming material properties of concrete. The focus is put on the chemical and physical factors of the early hydration mechanism. Ultrasonic pulse velocity offers a possibility to follow in situ and non destructive the developments of the microstructure. Isothermal conduction calorimetry determines the overall chemical reactivity. With the help of these methods the end of the dormant period could be clearly defined and the diversity of the acceleration processes were documented of the single Portland cements.


Online publication: 2009-06-09
Publication type : full_text
Public price (Euros): 0.00