General Technical Specification for Multilayer Epoxy Coating

Preliminary information:

The phrase “general” in the specification name; It was placed due to the availability of different multilayer epoxy coating system options, depending on the specific conditions of the application and the facility. The thickness should be determined according to the specific conditions of the area to be applied. Material consumption will occur according to the determined thickness. Multilayer epoxy coating applications are made in 2-3 mm. A special specification should be prepared depending on the characteristics and needs of the enterprise to be applied.

Reinforced Concrete Surfaces to be Epoxy Coated:

In the reinforced concrete floor where epoxy coating will be applied, the concrete compressive strength must be at least 25 N / mm 2 and the concrete surface tensile strength must be at least 1.5 N / mm 2 . Tensile strength will be made with a tensile tester (Pull Off Tensile Tester). While the field concrete is poured, tensile stresses will be taken into account and double layer steel mesh or reinforcement suitable for the project will be placed. Surface hardener will not be used when pouring field concrete in the area where epoxy will be applied.

The reinforced concrete surface will be smoothed properly while the tray is installed in the trowel, and a smooth and smooth surface will be obtained. Joint cutting will be performed within the framework of general engineering rules in order to control possible cracks in the field concrete. In order to start the epoxy coating process, the relative humidity of the concrete must be below 4%. Although it depends on the season and ambient conditions, at least 4 weeks should pass after the concrete pouring. If the required moisture conditions and waiting times cannot be achieved, different primer and coating systems will be considered.

Temperature and Humidity:

For epoxy coating application, the ambient and concrete surface temperature must be between + 10 ° C and + 30 ° C. The concrete moisture rate should be 4% by weight unconditionally and the relative humidity in the environment should be less than 80%. Relative humidity; It must be below the “Condensation Temperature”, also known as the dew point. Concrete moisture rate will be measured with a humidifier and the ambient temperature will be increased when necessary.

Surface Preparation:

In reinforced concrete floors suitable for epoxy coating; Surface preparation is made in order to remove possible loose particles, weak slurry layer, oil and dirt layer, if any, and roughen and clean the surface. Epoxy coating surface preparation should be done with a vacuum ball blasting machine (Shot Blasting-Blastrac). Traditionally, marble polishing machines, diamond-tipped hand machines and rotatigers are used for this process. With these machines, sufficient surface preparation cannot be made to absorb the primer on the surface. It is allowed to use hand spirals where the vacuum balling machine cannot enter. At the end of the surface preparation process, the surfaces will be clean, dry, free from oil and dirt layer, and curing materials, if any. Weak concrete will be removed,eyelet gaps and holes will be repaired in accordance with the technique. Cement laitance on reinforced concrete surfaces will be removed by using abrasive equipment and the surfaces will be made open porous. The high places on the surface will be abraded, sanded and cleaned. All dust, loose and volatile particles on the application surface will be cleaned with a brush and vacuum cleaner.

Surface Repair:

If there are pits, fractures and cracks on the reinforced concrete surface, segregations are made with epoxy primer and epoxy mortar. If the cracks are deeper than 4-5 mm and have a large area, cement-based repair mortars may also be preferred. If there is a danger of water coming from the floor, the option of filling the crack section by epoxy injection should be reviewed. If the reinforced concrete slab is working and there is a risk of cracking in the existing coating, it should be applied with glass fiber. If capillary rise of water or moisture cannot be prevented by epoxy injection, possible leakage areas should be filled with polyurethane injection method. In this case, moisture content conditions and waiting times should be observed before applying epoxy.

Epoxy Primer Application:

The reinforced concrete surface, which has been prepared, cleaned and repaired and provides minimum humidity conditions, is ready for epoxy primer application. Like other materials to be used in the application, epoxy primer will be solvent-free. While preparing the epoxy material, first component A (epoxy resin) will be mixed with a low-speed mixer, while the mixing process is continued, component B (epoxy hardener) will be added slowly and the mixing process will continue until the material becomes homogeneous. Material consumption will be 300-500 gr / m² depending on the surface conditions and the system to be applied. Solvent-free epoxy primer can be applied to the surface with or without a roller or trowel. This again determines the multilayer epoxy system to be applied. In the same way, silica or quartz filler can be sprinkled on it, depending on the system chosen.Epoxy primer; It penetrates into the concrete, fills the voids, increases the impact and chemical resistance of the surface, adheres to the reinforced concrete surface with a very high resistance. It enables the coating to be integrated with the reinforced concrete surface by adhering to the layers that come after it.

Mezzanine Application:

Solvent-free epoxy primer applied surfaces will be protected from moisture, dust and air flow and will not be opened to pedestrian or vehicle traffic. Depending on the weather and ambient temperature, a solvent-free epoxy intermediate coat will be applied on it 8-24 hours after the primer application. If filler is sprinkled on it before application, excess filler will be removed with the help of industrial brooms. While preparing the intermediate layer material, component A (epoxy resin) will first be mixed with a low-speed mixer, while the mixing process continues, component B (epoxy hardener) will be added slowly. After the material becomes homogeneous, component C (silica-quartz filler) will be added slowly. After mixing for about 3 more minutes, intermediate coat application will be started. Epoxy intermediate coat will be applied in the desired color and with a trowel.Depending on the multilayer epoxy coating system selected, silica – quartz filler can be sprinkled on it.

Epoksi Kaplama Son Kat Uygulaması:

After the epoxy intermediate coat application, the surfaces will be protected from moisture, dust and air flow. It will not be opened to pedestrian or vehicle traffic in any way. Depending on the weather and ambient temperature, solvent-free epoxy paint will be applied as a top coat 8-24 hours after the intermediate coat application. Before the application, if there is a filler that has been sprinkled, the loose materials on the surface are removed by sweeping with the help of industrial brooms. Sanding can be done depending on the desired and needed surface roughness. While preparing the epoxy paint, which is the top coat material for the multilayer epoxy coating, first component A (epoxy resin) will be mixed with a low speed mixer. While the mixing process continues, component B (epoxy hardener) will be added slowly. Mixing will continue until the ingredients are homogeneous.Solvent-free epoxy paint will be applied in the desired color, with a check rust and a roller. When the application is finished, an orange peel patterned (slightly rough) surface will be obtained. Depending on the weather and ambient temperature, the application area can be opened to pedestrian traffic within 48 hours.

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