How is putty layer powdery serious cause, how should handle?

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[Abstract]:

Putty dry powder, investigate its root cause, can be attributed to the bond system did not play its role, and why the bond system, whether it is inorganic binder or organic binder lost effect, can be considered from the following aspects: 1 putty itself binder quality problems; 2 binder didn't work, the adhesive mechanism of adhesive is containing the wet powder mortar, as the moisture absorption at the grassroots level, the hydraulic material consumption, to reduce air volatilization three aspects on the surface, the resin particles gradually close, interface gradually blurred, resin gradually mutual confluence, to eventually become a continuous polymer connecting, this process occurs mainly in mortar hole and solid surface, so to form the bonding effect. However, if we scrape putty layer is too thin or forced ventilation or heating drying after scraping, water will be lost too quickly, and the resin particles of the binder cannot form a connector well, thus losing the bonding effect.

Solution: light powder can be removed with wet towel floating ash, and then wall occlusion for interface treatment, and then batch scraping can pay attention to the batch scraping thickness;

If the powder of putty layer is serious, it is suggested to use wall occlusion for interface treatment after eradication and then conduct batch scraping.

Putty dry powder, investigate its root cause, can be attributed to the bond system did not play its role, and why the bond system, whether it is inorganic binder or organic binder lost effect, can be considered from the following aspects: 1 putty itself binder quality problems; 2 binder didn't work, the adhesive mechanism of adhesive is containing the wet powder mortar, as the moisture absorption at the grassroots level, the hydraulic material consumption, to reduce air volatilization three aspects on the surface, the resin particles gradually close, interface gradually blurred, resin gradually mutual confluence, to eventually become a continuous polymer connecting, this process occurs mainly in mortar hole and solid surface, so to form the bonding effect. However, if we scrape putty layer is too thin or forced ventilation or heating drying after scraping, water will be lost too quickly, and the resin particles of the binder cannot form a connector well, thus losing the bonding effect.

Solution: light powder can be removed with wet towel floating ash, and then wall occlusion for interface treatment, and then batch scraping can pay attention to the batch scraping thickness;

If the powder of putty layer is serious, it is suggested to use wall occlusion for interface treatment after eradication and then conduct batch scraping.

How is putty layer craze caused, how should handle?