Influence of ageing on the frost salt resistance of high performance concrete

Author(s): S. Palecki
Paper category: Conference
Book title: 2nd International conference on Microstructural-related Durability of Cementitious Composites
Editor(s): Guang Ye, K. Van Breugel, Wei Sun, Changwen Miao
Print ISBN: 978-2-35158-129-2
e-ISBN: 978-2-35158-123-0
Publisher: RILEM Publications SARL
Pages: 505-515
Total Pages: 10
Language: English

Abstract: Ageing effects have a great influence on the microstructure and durability of concrete structures, incorporating additives like silica fume or fly ash. In the past the freeze-thaw resistance of concrete mixtures has been always tested in the lab by accelerated test procedures after 28 days due to conformity reasons. However in practice structures are often exposed to frost attack at later point of times. On top of this, former investigations could verify that the results of durability testing of high-performance mix designs in combination with additives are highly affected by the testing age. Due to effects like autogenous shrinkage or self desiccation, which play a more important role when testing HPC, the microstructure is significantly influenced. This results also into different damage behavior with regard to internal deterioration.
In this paper the results of a spectrum of HPC mixes under frost salt attack with variation of additives and admixtures as well as different testing ages are introduced. The research program includes the investigation of the frost salt resistance of specimens with testing ages between 28 days and 9 years and different storage conditions such as storage under laboratory conditions as well as outdoor exposure. All specimens have been tested by means of the CDF/ CIF-test. Subsequently, the changes within damage progress and transport mechanisms have been analysed and correlated with parameters such as carbonation phenomena and structural properties. Overall aim of this research work, which is funded by the German Research Foundation (DFG), is the development of a time dependent damage model for frost salt exposed HPC.

Online publication: 2013
Publication Type: full_text
Public price (Euros): 0.00

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