The base layer is the basis of epoxy floor paint. Detailed inspection and analysis are needed to determine the treatment measures. (1) measuring compressive strength. The compressive strength of industrial epoxy floor paint should not be less than 24 MPa. In order to meet some important requirements, it may need higher strength, it is necessary to use rebound meter to measure the strength, or take core to measure the compressive strength.
(2) determine bond strength. The surface of concrete base is usually a low strength layer formed by cement slurry within a few millimeters of thickness. The stress caused by shrinkage, temperature change or repeated action of load caused by hydration reaction of cement will lead to the decrease of bond strength. Bonding strength should not be lower than 1.5MPa.
(3) moisture content at the basic level。 Only when the moisture content of cement base is not more than 6%, can the coating be applied, so the measurement of moisture content is particularly important。 The best method to determine the moisture content of the base course is the plastic film covering experiment method, that is, at least 1mX1m polyethylene film is sealed on the concrete surface with tape, and after at least 24 hours, the moisture content is determined according to the amount of condensate water appearing on the plastic film。
(4) ambient temperature。 Ignoring the temperature factors of construction environment can lead to quality defects of epoxy floor paint, such as lower bond strength, watermarking, voids, irregular surface and hardening。 Therefore, the environmental temperature (air temperature), the surface temperature of the base, dew point temperature and other data must be measured several times a day in the construction。
(5) grass-roots clean-up. For oil, oil or organic acid, inorganic acid or cement slurry pollution, if not thoroughly removed, will affect the bonding performance of epoxy floor paint coating. Therefore, the surface must be cleaned by mechanical means and checked by measuring the bond strength.
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