What is the use of alkali resistant fiberglass mesh cloth on the exterior wall?
Standard: to strengthen the material function and alkali fiberglass mesh cloth to external wall thermal insulation layer, the main role is: to improve the mechanical strength of the surface layer, ensure the continuity of the surface layer resistance, shrinkage pressure and insulation dispersed surface layer stress, avoid stress concentration, surface resistance nature temperature and humidity changes and accidents caused by the impact of the cracking. Therefore, alkali resistant glass fiber mesh fabric plays an important role in the external insulation system, so the selection of good glass fiber mesh fabric is also an important component to ensure the comprehensive quality of the external insulation system. The current national standard technology of exterior insulation (JG149-2003): glass fiber warp and weft resistance tensile strength shall not be less than 750N/50mm, alkali resistant tensile strength retention rate of not less than 50%, more than 130 grams of weight per square meter.
How to identify quality problems of alkali resistant glass fiber cloth, glass fiber cloth market price of 1. of the worst is usually around 1 yuan -1.60 yuan, his glass fiber is usually made of some kind of waste glass beer bottles, the production process for clay crucible drawing, production process is prohibited by the state, the surface coating is non alkali resistant emulsion. From the intuitive point of view: the work is relatively rough, generally sold in the market volume of the theory, often lack of length, grams of weight is not enough, two fold on the break, the contact is not firm, easy to shift, and easy to stab the skin. In the insulation layer in general in the two months after the loss of strength using the grid cloth, if the mortar off grid cloth out, just gently crushed, fiberglass yarn is made into powder.
The use of composite plaster mortar of alkali resistant glass fiber cloth, on the one hand, can effectively increase the tensile strength of the protective layer, on the other hand, can effectively disperse stress, can be originally may have wider cracks spread into many smaller cracks, thus forming the crack in. The surface coating material and the amount of coating have important significance to the alkali resistance of glass fiber mesh cloth, and the glass fiber variety has a decisive significance for long-term alkali resistance. In the process of using glass fiber mesh: mesh between lap width not less than 50mm, the negative corner mesh to pressure stubble lap, its width is larger than 50mm, yang angle is greater than or equal to 200mm. In the construction, mesh paving should be smooth, no wrinkles, mortar plumpness reached 100%, at the same time to find and maintain smooth, straight corner square and the verticality of yin and yang.
