Coatings for concrete - Concrete Repair - page 301

Other in-situ properties of coatings on concrete that can be checked easily
with portable instruments include the following:

• the presence of pin-holes ('holidays') using a high voltage detector

• the slip (or skid) resistance of horizontal trafficked surfaces

• aspects of appearance, such as gloss, colour, and light-reflectance values.

Trial areas can be useful, particularly on large contracts and where
maintenance of a high level of performance is critical. By this means,
standards of workmanship can be agreed - and any problems resolved - at
an early stage. Where necessary, extensive in-situ testing, or core removal
for laboratory assessment, can also be carried out conveniently at this stage.
Common problems that occur on site are variable, inadequate coating
thickness (can be checked by wet film thickness gauge, Figure 17.2, and dry
film laboratory tests on cores) and using an incorrect material (one material
specified, another one used!). The latter can be resolved by careful supervision
on site and techniques are available to positively identify the coating in the
event of a dispute (infra-red spectroscopy and electron microprobe analysis
of the pigment to identify elements present).

References
ACI (1999) Concrete Repair Manual , pp. 619-661, International Concrete Repair
Institute, ACI International.
Atkins, C. (2007) 'EN1504 Part 2, Surface Protection Systems.' Concrete , September,
pp 13-14.
BS EN 1504-2: 2004 'Products and Systems for the Protection and Repair of
Concrete structures. Definitions, Requirements, Quality Control and Evaluation
of Conformity. Surface Protection Systems for Concrete.'
BS EN 1504-9: 2008. 'Products and Systems for the Protection and Repair of
Concrete Structures. Definitions, Requirements, Quality Control and Evaluation
of Conformity. Part 9: General Principles for the Use of Products and Systems.'
BS EN 1504-10: 2003 'Products and Systems for the Protection and Repair of
Concrete Structures. Definitions, Requirements, Quality Control and Evaluation
of Conformity. Site Application of Products and Systems and Quality Control of
the Works.'
Bungey, J. H., Millard, S. G. and Grantham, M. G. (2006) Testing of Concrete in
Structures, fourth edition, London: Routledge.
CIRIA (1992) Technical Note 143, London: CIRIA
Concrete Repair Association (UK) (1992), The Application and Measurement of
Protective Coatings for Concrete - Guidance Note, Borden: Concrete Repair
Association.
Concrete Society (2000) Diagnosis of Deterioration in Concrete Structures, Technical
Report No. 54, London: Concrete Society.
Department of Transport/Highways Agency (UK) (1986) 'Materials for the Repair
of Concrete Highway Structures', Departmental Standard BD 27/86, London:
Department of Transport.