Method for eliminating influence of bleeding on surface strength of bleeding surface of GRG (Glass Fiber Reinforced Gypsum) product

Abstract

The invention discloses a method for eliminating the influence of bleeding on the surface strength of a bleeding surface of a GRG (Glass Fiber Reinforced Gypsum) product. The method comprises the following steps of marking a corresponding contour line on the side wall of a mold cavity of a mold according to the gypsum board thickness value of the GRG product, wherein the vertical distance from any point of the contour line to the bottom of the mold cavity is equal to the gypsum board thickness value; arranging a plurality of bleeding water drainage holes on the contour line or slightly above the contour line; then arranging an embedded part at the bleeding water drainage holes; laying five layers of gypsum plaster and glass fiber felts in the mold cavity in layers; drawing the embedded part out after a reinforcing edge is prepared; after laying the fifth layer of gypsum plaster, erecting a shaping board at the upper edge of the side wall of the mold to smear towards the same direction or smear back and forth; then laying the fifth layer of glass fiber felt on the layer of gypsum plaster; and smearing again by using the shaping board along the upper edge of the side wall of the mold before the gypsum plaster is pre-hardened. According to the method, the problem of low strength of the bleeding surface caused by bleeding can be solved, the gypsum board thickness can be controlled, and the damage to the strength of the gypsum product caused by punching after the hardening of the gypsum product is avoided.

Description

technical field [0001] The invention relates to the technical field of gypsum building materials, in particular to a method for solving the effect of bleeding on the surface strength of the bleeding surface of GRG gypsum products. Background technique [0002] As one of the three major cementitious materials, gypsum has the advantages of light weight, good sound insulation and heat insulation, good dimensional stability, excellent fire resistance, environmental protection and energy saving, and is widely used in the construction field, but it has the disadvantage of low flexural strength. Therefore, various fibers are usually added as reinforcing materials for gypsum, common fiber reinforcing materials such as glass fibers and various plant fibers. Glass Fiber Reinforced Gypsum (Glass Fiber Reinforced Gypsum) is called "GRG" for short. After this kind of gypsum is reinforced with glass fiber, its flexural strength is greatly improved, and it has good nail pulling resistance ...

AI Technical Summary

Problems solved by technology

[0005] In the field of construction, the technical means usually used to solve the problem of concrete bleeding is to adjust the ratio or components in the concrete mortar, or to change the procedure of preparing the slurry, but at least 4 to 5 additives are used when configuring the gypsum slurry. And these additives will interact and affect each other. Most additives are beneficial to certain aspects and have side effects on other performances. Therefore, as long as the quality of one of the additives changes slightly during production, it will make it difficult to achieve the effect of the gypsum slurry formula. , the method of changing the pulping process and procedures cannot be applied to the production of GRG gypsum products due to the change of the on-site operation procedures and the extension of the on-site operation time. Moreover, generally GRG gypsum products have reinforced edges. Bleeding on the water surface cannot be ruled out, and we can only wait for it to slowly volatilize. In this way, when the bleeding is slightly serious, because the water-to-paste ratio of the gypsum on the bleeding surface is relatively high, and the concentration of retarder in the bleeding water is high, the bleeding will evaporate after the bleeding The strength of gypsum on the water surface is generally lower than that of other parts of the gypsum product

Therefore, the above-mentioned technical means cannot solve the problem of low surface strength of the bleeding surface of GRG gypsum products due to the problem of bleeding. At the same time, due to the limitation of the reinforcement edge, the thickness of the gypsum board cannot be accurately controlled. Compared with the specified size, it is sometimes thinner and sometimes thinner thick, uneven thickness

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