Requirements for the Substrate in Self-Leveling Cement Flooring Construction
Release Time:
2015-09-07
Source:
Requirements for the Substrate in Self-Leveling Cement Flooring Construction
The quality of self-leveling cement flooring depends not only on the cement itself but also on the construction process; generally speaking, Self-leveling cement Floor construction is divided into the following steps: applying an interface agent, mixing the self-leveling compound, pouring the self-leveling material, screeding and deairing the self-leveling layer, finishing with grinding, and dust removal. To achieve a high-quality self-leveling floor, the following are the requirements for the substrate:
1. The substrate must be solid and robust, with no defects such as sanding, hollowing, delamination, peeling, looseness, rough surface, oil or grease, dust, or cracking. The compressive strength shall be not less than 15 MPa, preferably exceeding 20 MPa.
2. Ground moisture content: Measure the moisture level of the substrate, as cement-based substrates can only be worked on when their moisture content is below 8%. The best method for determining the extent of rising damp is the “rubber mat test” (place a polyethylene sheet at least 1 m × 1 m over the concrete surface and secure it with tape). Do not remove the sheet until at least 24 hours have elapsed. This will reveal the amount of condensation present.
