Surface parking lot concrete floor coating specification

A surface car park exposed to the sun and rain specifies a concrete floor coating

introduction:

A system for making a coating resistant to abrasion and resistant to fine rough UV is required for a lot of movement of vehicles, in a surface parking lot exposed to the sun in a surface parking lot complex. The coating will be carried out after proper treatment of cracks and expansion seams. And the coating will be smooth and slightly rough. The appropriate coating is a multi-thick UV-resistant monolithic polyurethane coating, on a primer layer that penetrates the concrete, and at least 3 mm thick  for abrasion resistance  and an upper UV protection layer. The casting layer of 3 mm and/or more will be done in one thick casting.

Surface parking concrete floor coating specification www.denber.net

A surface car park exposed to the sun and rain specifies a concrete floor coating

Area preparation:

• If there is light grease on the concrete and the grease has not penetrated the concrete – dissolve it with  ZX-12  degreaser by scrubbing (road sweeper or washing machine) and washing with high water pressure (Gernik – working pressure 150-160 atmospheres), after complete drying (moisture less than 4% Testing with a hygrometer with pins penetrating the concrete) – start polishing.
• If there is grease penetration into the concrete – spreading an emulsifier  Al shemen N  “for absorbing the grease” and washing with water until foam stops coming out. after complete drying. (moisture less than 4% test with a hygrometer with pins penetrating the concrete) – start polishing.
• If there is a layer of grease/hardened soot – spread  carbon cleaner  and rub until fully melted/soften and mechanically scrape until you get concrete free of oil/hardened soot, spread into N oil and rinse with water. After complete drying (as mentioned) – start polishing.
• Expansion seams  – removal of any previous sealing, including bituminous sheets and any other existing sealing. Diamond polishing on both sides of the seam. – and polishing the lip of the seam includes penetration into the seam to a depth of up to twice the width of the seam. Strict vacuum suction.

Polishing:

• On an old coating layer – for renewal – polishing with paper sander No. 26 until a matte surface is obtained. or fine planetary diamond polishing. Strict vacuum suction. In addition, before starting coating, the surface should be washed with methyl ethyl ketone MEK to soften and reduce the surface tension of the old coating layer.
• On old/new concrete – for large areas. Diamond polishing with a planetary polishing machine with 6 diamond discs or a large diamond disc “7-“10 for small areas. – and a 4” diamond disc for the corners. While polishing, the machine must be connected to a vacuum system. – And the polishing worker must wear protective glasses, earplugs and a dust mask. High-quality polishing of all concrete surfaces is required. – Until you get white (very light) concrete. Vacuum suction strict

A surface car park exposed to the sun and rain specifies a concrete floor coating

Primer layer:

• Mix part A + part B well with an electric stirrer until you get a uniform solution.
• Applying a layer of  epoxy floor primer  1 liter per 5 square meters of concrete. By spraying/spraying. For damp or partially cured concrete –  epoxy floor primer 450
• On an old existing coating layer there is no requirement for a primer and provided that there are no gaps in the coating exposing the concrete. Even then, primer can only be applied to bald spots. After high-quality polishing and pumping until you get white and clean concrete .

 Pouring grout and filling expansion seams:

• If there are “bald areas” in the floor/large holes, height differences must be filled with  a three-component epoxy grout  (base+hardener+filling aggregate of various sizes).
• Deep diamond polishing should be performed in the holes. Bald areas until white and clean concrete is obtained, pump and apply  epoxy floor primer  before applying the  grout .
• Preparation of grout mixture: mix part A + part B. – and while mixing, add mixed quartz into the bucket until you get a thick mixture like concrete.
• The mixture should be poured immediately into the clearings/holes and level two and a half. – with mulch until full compression is obtained and leveling to “zero” height. 24 hours drying at least.
• Expansion seams  –  for large and deep seams  where there is a chance of the sealant leaking to the floor below, the root of the seam must be sealed with  polyurethane gum  (let it dry for at least 3 hours) or, alternatively, compress a suitable backing profile so that there remains a depth to fill with sealant at least the width of the seam. The rest of the seam volume up to “zero” height must be filled with  Polyflex 225  two-component putty with the addition of Aerosil/Cabosil for qualification until a thick and comfortable mixture is obtained. With leveled expansion seams, you can work with no qualification at all or only a slight qualification. For narrow seams – you can fill directly with a well-certified polyplex 225 putty. No backing profile or gum at the root of the seam. 24 hours drying at least.

A surface car park exposed to the sun and rain specifies a concrete floor coating

Casting  Polyflex Floor 225 A  100% solids:

• The casting can be done 4-24 hours after applying the primer. (if no grout is required in the area for alignment). or 24 hours after filling expansion joints and grout. It is recommended after 4 hours to check the stickiness of the primer. – and if it is dry enough to walk on. – It is recommended to start with casting. The optimal time point to start casting is the moment when, by pressing hard, there is no fingerprint left on the primer. Waiting more than 24 hours may make the primer too hard. – and a surface tension such that it will reject the top coating layer. Then the softening of the surface in MEK is required. – If 3 days or more have passed, another new primer layer is required. which after about 4 hours you can start casting.
• Another primer layer  after the grout. –  It is always recommended and will  ensure a final closure of open “porim” in concrete. – which were not finally closed in the first primer layer. Something that will prevent the phenomenon of bubbles resulting from gases emitted from completely unsealed concrete. Wait for drying 4 hours or fingerprint test and start pouring.
• The casting –  before starting the casting, make sure that the humidity in the air is lower than allowed. – relative to the ambient temperature on the day of casting. (See table for optimal castings of polyurethane coatings)
• Mix  Polyflex Floor 225A  part A 15 liters + part B 5 liters (ratio 3:1) and together 20 liters. You can add up to a third of the mixture (another 6-7 liters) quartz flour or fine quartz 0.1-0.3. – and provided that its humidity is lower than 4%. (must be checked and verified with a suitable spike moisture meter or a nylon sheet).

A surface car park exposed to the sun and rain specifies a concrete floor coating

• Transfer the mixture to a clean container and mix again – mandatory. All this within up to 10 minutes to prevent heating and spoilage of the material.
• Immediately pour the entire mixture in the corner of the area to be coated and level with a rubber notched ruler to the required thickness (at least 3 mm). Add and continue pouring sections until the completion of about 2 meters of molding strip from the wall.
• Go with a spiked roller to remove bubbles on the cast surface.
• Continue casting another area and again with the spike roller and so on until the entire casting is finished. Be sure to work quickly and intensively without breaks to maintain the casting sequence until the end.

Anti-slip roughness layer:

• After 12-24 hours. – and provided that the casting has dried. Prepare a polyplex 225A mix with the desired size abrasive aggregate for roughing. (A size up to 1.2 mm and no more is recommended so that it does not protrude so that with light blows or tire wear the aggregate will be pulled out of the coating).
• Apply with a short hair epoxy roller. – the mixture on the surface to obtain a uniform roughness without “baldness”.
• Alternatively, you can apply a 1 mm layer of polyplex 225A and spread the quartz manually over it uniformly.

Denbergloss UV protection layer  in the  shade of the casting: 

• After 4-24 hours drying of the rough polyplex 225A layer, apply with a roller one layer of at least 100 microns dry or spray with airless, 2 layers of  Denbergloss Floor assorted color  of at least 50 microns dry ca.

A surface car park exposed to the sun and rain specifies a concrete floor coating

warning:

• Coating on new concrete only after at least one month to ensure completion of the curing process.
• on damp concrete. If it is not possible to dry to the required level. (Due to lack of time, natural environmental humidity, it is forbidden to dry with a gas dog for safety reasons). Apply a coat of epoxy primer 450 only.

We will be happy to be at your service with advice and telephone support:

• 08-9960794 Dr. Belen Evgenia
• 050-3551551 – Kogan Baruch