EXPERIMENTAL STUDY ON CARBONATION AND CHLORIDE MIGRATION COEFFICIENTS OF SELF-COMPACTING CONCRETE (SCC) WITH BINARY AND TERNARY MIXTURES OF FLY ASH (FA) AND LIMESTONE FILLER (LF)

Author(s): Silva, P. R.and Brito, J.
Paper category: Conference
Book title: XIII International Conference on Durability of Building Materials and Components - XIII DBMC
Editor(s): Marco Quattrone, Vanderley M. John
Print ISBN: none
e-ISBN: 978-2-35158-149-0
Publication year: 2015
Pages: 312-319
Total Pages: 8
Language: English

Abstract: This paper’s goal is to present the results of an experimental study on the behaviour of SCC with binary and ternary mixtures incorporating high quantities of FA and LF regarding degradation mechanisms, namely carbonation and chloride migration.

Despite the requirements in terms of hardened state properties for SCC being the same as for conventional concrete (CC), the mix quantities used are different and that can substantially affect the SCC’s durability, namely regarding in terms of carbonation and chloride penetration. It is therefore relevant to expand the knowledge on the way the aggressive agents mentioned diffuse or penetrate SCC.

For that purpose, a total of 11 SCC mixes were produced: 1 with cement only (C); 3 with C+FA in 30%, 60% and 70% substitution; 3 with C+LF in 30%, 60% and 70% substitution; 4 with C+FA+LF in combinations of 10-20%, 20-10%, 20-40% and 40-20% substitution respectively.

The resistance against CO2 penetration into the SCC was tested by an accelerated laboratory test procedure described in specification LNEC-E391 and in recommendation RILEM CPC-18. The resistance to chloride ions migration was tested resorting to non-steadystate migration tests, according to specification LNEC-E463 based on NT-BUILD-492.

The results obtained indicate that the properties studied are strongly conditioned by the type and quantity of additions used. The use of ternary mixtures also proves to be extremely favourable, confirming a beneficial effect of the synergy between these additions.

Online publication: 2015
Publication Type: full_text
Public price (Euros): 0.00