Why is it said that gypsum plaster will eventually replace cement mortar for wall plastering?
Release Time:
2016-11-25
Source:
Why is it said that gypsum plaster will eventually replace cement mortar for wall plastering?
1. Gypsum, lime, and cement are the three major cementitious materials. However, gypsum causes particularly little pollution, effectively protects the environment, and can also help alleviate smog. Machine-sprayed gypsum mortar.
2. At present, the plastering materials commonly used in China for concrete interior walls and ceilings are primarily mixed mortar and lime mortar. The main drawbacks of this construction method include significant drying shrinkage, poor bond strength, complex procedures, and low labor productivity. Moreover, concrete mortar imposes stringent requirements on substrate preparation and the strength of each mortar layer; if any one of these steps is not properly controlled, it can lead to common quality defects such as hollowing, cracking, surface blistering, efflorescence, and whitening of the plaster layer. Directly applying putty powder for leveling also presents issues, including accelerated aging of the wall surface and a higher risk of cracking and spalling in areas where the coating is excessively thick.
To address the common shortcomings of traditional plastering, gypsum-based skim coats have been developed. Compared with conventional plastering techniques, this method offers numerous advantages: rapid setting, fire resistance, thermal insulation, sound insulation, indoor humidity regulation, prevention of hollowing and cracking, strong adhesion to the substrate, a smooth and fine surface finish, ease of application, shorter construction periods, and high efficiency—up to 50 times greater than that of traditional plastering.
Top Ten Advantages of Plaster for Painting:
1. Excellent bonding performance: after cleaning the wall substrate, this material can be applied directly to various types of wall plastering.
2. No interface treatment is required for concrete slabs, columns, beams, or lightweight masonry.
3. The raw materials are all natural ingredients; after application and curing, the coating exhibits no adverse shrinkage and possesses a slight expansion property, which helps prevent the formation of fine cracks on the wall surface. Once applied, it does not result in hollowing or cracking.
4. After spray application and shaping, the wall surface exhibits a certain degree of material plasticity and contains air bubbles and voids, endowing it with active functions that other materials lack—namely, gas absorption and sound absorption. In particular, during prolonged rainy weather, it effectively absorbs moisture-laden indoor air.
5. Possesses certain moisturizing and fire-resistant properties.
6. This material is made of natural ingredients; indoor air quality tests show that all measured values are significantly lower than the regulatory limits for painted cement mortar, confirming that it is a non-polluting product.
7. Excellent energy-saving performance, elimination of fugitive dust caused by the use of yellow sand on conventional construction sites, and reduced space required for stockpiling raw materials at the construction site.
8. This material is applied using mechanical spray construction, with a daily output of over 400 m² per shift, which effectively improves project schedule and quality while eliminating the substantial labor requirements associated with conventional mortar plastering.
9. For machine-sprayed gypsum mortar wall surfaces, any subsequent repairs required for re-embedding pipes or modifying equipment will not result in delamination or cracking of the wall surface.
10. Suitable for use with cast-in-place concrete, aerated concrete, polystyrene boards, various thermal insulation slurries, and fly-ash brick products.
