Saturation level of the superficial zone of concrete and adhesion of repair systems

Luc Courard , Jean-François Lenaers , Frédéric Michel , Andrzej Garbacz

Abstract

Appropriate surface saturation level is essential for the durability of the repaired structure. The repair material is often blamed for “not sticking”, although the general source of the trouble lies with the substrate surface conditioning. An extensive research project has been undertaken to develop specifications and performance criteria for surface preparation of concrete substrates. A field test was developed to evaluate the optimum moisture conditioning of the substrate concrete prior to application of repair material; this has been calibrated and compared with destructive and non-destructive on three types of concrete and two types of surface preparation. In order to evaluate different saturation levels, concrete samples have been stored in more than 12 modes of conservation. Finally, repair mortars have been applied on concrete substrates and adhesion was measured for different concrete surface saturation levels. Initial Surface Absorption Test (ISAT) can be used as an attractive quantitative test to evaluate saturation level of concrete substrate. Moreover, it is clearly shown that saturation levels higher than 50\% and lower than 90\% are requested for promoting adhesion of PCC mortars.
Author Luc Courard
Luc Courard,,
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, Jean-François Lenaers
Jean-François Lenaers,,
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, Frédéric Michel
Frédéric Michel,,
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, Andrzej Garbacz IIB
Andrzej Garbacz,,
- The Institute of Civil Engineering
Journal seriesConstruction and Building Materials, ISSN 0950-0618
Issue year2011
Vol25
No5
Pages2488-2494
Publication size in sheets0.5
Keywords in Englishadhesion, Concrete, Repair materials, Saturation, water
DOIDOI:10.1016/j.conbuildmat.2010.11.076
URL http://www.sciencedirect.com/science/article/pii/S0950061810006069
Languageen angielski
File
saturation level.pdf 1.05 MB
Score (nominal)35
Publication indicators WoS Impact Factor: 2011 = 1.834 (2) - 2011=2.134 (5)
Citation count*30 (2018-06-20)
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