Civil Engineering Reference
In-Depth Information
Common generic types
Main performance characteristics
Thermosetting systems
Solvented, water-borne or solvent-free
Undergo chemical reaction during cure
Formulations and performance vary
widely
Extremely versatile - can be 'tailored' to
specific requirements
Usually two-pack
Solvent-free systems are particularly
suited to very high-build applications (up
to at least 250 μm/coat)
Excellent barrier properties against liquids, gases and moisture vapour
Acceptable appearance although chalking and colour instability prevalent with some
products
Excellent durability under all conditions including frequent contact with, or immersion in,
aggressive chemicals
Good impact/abrasion resistance
May accommodate cracks in the concrete (likely to require fibre reinforcement)
Generally require a high level of surface preparation for potential to be fully realised
Systems available for application to wet surfaces (or, in some cases, under water)
Use may be limited/not possible at low temperatures (generally below 5°C)
Cure rate often slow, even at 'normal' temperatures
Fairly demanding application requirements (specialist applicator usually advisable)
Maintenance often difficult due to potentially poor old/new intercoat adhesion
Bituminous systems
Hot-applied (generally with fabric
reinforcement)
Cold-applied
Water-borne emulsions or solvent-borne
(± reinforcement)
Used mainly for waterproofing applications below and above ground
Reasonably durable but can tend to embrittle with age, particularly when exposed to
sunlight and hot conditions
Relatively easy to apply/re-apply with good tolerance of surface and ambient conditions
