Also to be considered are the local weather conditions that will result in
minimuma nd maximum temperatures as seasonsc hange. Also to be considered are the possibilities of spillage of chemicals on the surface. Coatings
can be applied in varioust hicknesses depending upon the environment
and contaminants.
Thin filmc oatings are applied at less than 20 mils dry film thickness.
Commonly used aree poxiest hat may be formulationso fp olyamides,
polyamines, polyesters, or phenolics. These coatings will protect against
spillso fh ydrocarbon fuels, somew eak solutions of acids and alkalies, and
manyagricultural chemicals. Epoxies can also be formulated to resistspills
of aromatic solventss uch as xylol or toluol.
Most epoxies will lose someoftheir gloss and develop a“chalk face” when
exposed to weather.However,this does not affect theirchemical resistance.
Medium film coatings are applied at approximately 20–40 mils dry film
thickness. Epoxies used in this category are often flake filledt og ive them
rigidity,i mpact strength, and increased chemical resistance. The flakes can
be mica, glass, or other inorganic platelets.
Vinyl esters are also used in this medium film category.T hese coatings
exhibite xcellent resistance to manya cids, alkalies, hypochlorites, and
solvents. Vinyl estersm ay also be flake filledt oi mprove their resistance.
Sonic vinyl esters requiret he applicationo falow viscosity penetrating
primer to properlyc leaned andp rofiled concreteb efore application,
whereas, others may he applied directly.
Thick film coatings are installed by two means. The specialty epoxy types
are mixed with inorganic aggregates and trowel applied. The polyesters and
vinyl estersa re appliedwithar einforcing fiberglass mat.
Table 10.2 provides ag uideline for specifying film thickness.
Them ostp opular monolithics urfacingsa re formulatedf romt he
following resins:
1. Epoxy, includingepoxy novolac
2. Polyester
3. Vinyl ester,including vinyle ster novolac
4. Acrylic
5. Urethane
6. Phenolic novolacs
10.3 Installation of Coatings
As with the application of any coating system, proper surfacep reparation
and installation techniques are essential. Basic preparations for the application of acoating area sf ollows:
Coatings for Concrete
519
CAT8247—CHAPTER 10—6/10/2006—12:52—SRIDHAR—XML MODEL B–pp. 515–532
minimuma nd maximum temperatures as seasonsc hange. Also to be considered are the possibilities of spillage of chemicals on the surface. Coatings
can be applied in varioust hicknesses depending upon the environment
and contaminants.
Thin filmc oatings are applied at less than 20 mils dry film thickness.
Commonly used aree poxiest hat may be formulationso fp olyamides,
polyamines, polyesters, or phenolics. These coatings will protect against
spillso fh ydrocarbon fuels, somew eak solutions of acids and alkalies, and
manyagricultural chemicals. Epoxies can also be formulated to resistspills
of aromatic solventss uch as xylol or toluol.
Most epoxies will lose someoftheir gloss and develop a“chalk face” when
exposed to weather.However,this does not affect theirchemical resistance.
Medium film coatings are applied at approximately 20–40 mils dry film
thickness. Epoxies used in this category are often flake filledt og ive them
rigidity,i mpact strength, and increased chemical resistance. The flakes can
be mica, glass, or other inorganic platelets.
Vinyl esters are also used in this medium film category.T hese coatings
exhibite xcellent resistance to manya cids, alkalies, hypochlorites, and
solvents. Vinyl estersm ay also be flake filledt oi mprove their resistance.
Sonic vinyl esters requiret he applicationo falow viscosity penetrating
primer to properlyc leaned andp rofiled concreteb efore application,
whereas, others may he applied directly.
Thick film coatings are installed by two means. The specialty epoxy types
are mixed with inorganic aggregates and trowel applied. The polyesters and
vinyl estersa re appliedwithar einforcing fiberglass mat.
Table 10.2 provides ag uideline for specifying film thickness.
Them ostp opular monolithics urfacingsa re formulatedf romt he
following resins:
1. Epoxy, includingepoxy novolac
2. Polyester
3. Vinyl ester,including vinyle ster novolac
4. Acrylic
5. Urethane
6. Phenolic novolacs
10.3 Installation of Coatings
As with the application of any coating system, proper surfacep reparation
and installation techniques are essential. Basic preparations for the application of acoating area sf ollows:
Coatings for Concrete
519
CAT8247—CHAPTER 10—6/10/2006—12:52—SRIDHAR—XML MODEL B–pp. 515–532