1. Original grassroots treatment

According to the different conditions of the original concrete floor on site, different treatment methods are adopted to achieve a hard and clean surface of the base layer. Cracks on the surface of the base layer should be chiseled into "V" shaped grooves and repaired with self-leveling mortar. Large pits and holes should also be repaired with self-leveling mortar. If the strength of the original base concrete floor is too low, there is cement laitance on the surface of the concrete base, or the sand is severe, the entire surface layer must be polished off. The low strength of the base concrete will lead to a reduction in the degree of adhesion between the self-leveling material and the base concrete, which may cause cracks and crusting in the finished self-leveling floor. Therefore, we require that the polishing process must be meticulous. If the flatness is not good, the areas with large height differences should be polished as smooth as possible, because the thickness of the self-leveling floor we make is 3~9mm. Too large height difference will affect the flatness of the self-leveling finished product.

2. Floor cleaning

After the polishing work is in place, the next step is to clean up the polished cement slurry dust and waste. First, use a broom to sweep the waste, and then use a vacuum cleaner to thoroughly clean the cleaned floor. Note: The cleaning work must be very meticulous, otherwise it will affect the construction speed and finished product effect of subsequent application of interface agent and self-leveling mortar.

3. Application of interface agent

The cleaned base concrete floor is spotless. We use two brushing methods to avoid missed brushing and incomplete brushing. We use different brushing sequences in different directions to ensure better painting effects and avoid missed brushing. And the painting is not in place. In addition, every time you paint, you should use the painting method of pressing the roller brush with the roller brush and the half-roller brush. This can more effectively avoid missing brushes and incomplete brushing. When applying the second coat of interface agent, be sure to wait until the first coat of interface agent is completely dry. The interface agent has formed a transparent film layer without white emulsion. The self-leveling mortar construction can only be carried out after the second coat of interface agent is completely dry. Otherwise, bubbles will easily form on the self-leveling surface. Note: The primer will take a longer time to dry when the temperature is low or the humidity is high. Do not apply self-leveling until the primer is completely dry.

4. Construction of self-leveling mortar

Before construction of self-leveling mortar, construction joints need to be set according to the width of the working surface and site conditions. The width of the cement self-leveling construction work surface should generally not exceed 6 to 8 meters. The construction section can be separated by foam rubber strips, and the lines should be positioned before pasting the foam rubber strips. Weigh the water required for each bag of self-leveling powder according to the given amount of water. Slowly pour the self-leveling dry powder into a mixing bucket filled with water. Stir with a mixer while adding the powder. Do not pour the powder at once. After the powder is completely added and stirred evenly, leave it for 1 to 2 minutes, then stir with a mixer for 1 minute before use. Be sure to avoid agglomeration. Pour the stirred self-leveling slurry evenly into the construction area. When pouring the slurry, be sure to pour each slurry on top of the last slurry. There should be no gap between the slurry and the last slurry. The working time of self-leveling surface layer is about 15~25 minutes at 20°C.

The higher temperature, the shorter working time. Reasonably arrange the work process so that the self-leveling mixing, pouring, and scraping processes can be completed within the working hours of the self-leveling mortar. Use the height control trolley to control the self-leveling thickness, and use the flat trowel to control the smoothness of the self-leveling surface. If a defoaming roller is used, the operation must be completed within the working hours of self-leveling, and the roller must be operated no more than 2 times. Spikes must be worn to avoid leaving marks on the self-leveling surface.

This process is the most important link, you should pay attention to:

1) No water or power outage is allowed during construction, and no intermittent construction is allowed.

2) Water consumption must be controlled using an electronic scale, and the amount of water added must be strictly in accordance with the proportion.

3) Self-leveling materials must be stirred evenly before being poured onto the construction floor.

4) The defoaming roller must be rolled during construction time to avoid roller marks.

5. Maintenance of finished self-leveling floor

Windows should be closed before construction work, all doors should be closed after construction work completed. It can be used 3 to 5 hours after construction, can be used normally after 7 days (depending on site conditions and thickness). If the site conditions are poor, appropriate maintenance treatment of the covering film must be carried out 24 hours after the completion of construction.

6. Expansion joint treatment

24 hours after the completion of the self-leveling ground construction, you can use a cutting machine to cut 3mm expansion joints at the expansion joints of the base concrete structure, clean the cut expansion joints, and seal and fill them with elastic sealant.

7． Protection of construction environment

During the cement self-leveling construction process, it is easy to contaminate the walls around the construction site. It is best to paste 5-7cm wide textured paper on the skirting board. After the floor construction is completed, use a blade to remove the excess textured paper.