The microcrystalline stone material, whether it is a whole body plate or a composite plate, has a cement mortar which is not well matched due to the special material. The problem of easy cracking in the paving application has been well known in the industry and is often encountered. It is recommended that the constructor read and refer to the following.
Here are six tips to prevent cracking of microcrystalline stone:
1. Precautions and special protection treatment when processing bricks
(1) The strength of the material is reduced on the rough surface formed by machining. Once the microcrystalline composite plate is cut by a profile, the strength of the cut portion will be somewhat reduced. In the application of cement mortar paving, in the special-shaped processing, the "overcut" sawing groove or the intersection of the groove formed on the back surface of the composite board may cause cracks during use after paving, so it is necessary to carry out the following Special treatment: directly add and fill the stone adhesive glue (commonly known as strong glue, marble glue) in the concave groove on the back side of the above microcrystalline stone to achieve the reinforcing effect. At the same time, a thin layer of stone adhesive is applied to the area 2 to 3 cm near the filled groove to achieve the isolation effect. The glue to be glued is basically solidified and can be used for normal paving.
(2) The surface of the microcrystalline stone is very high in gloss and the characteristics are somewhat similar to glass, so it is easy to show any slight scratches; therefore, when processing such as edging, dividing, excavating or opening, special care must be taken to protect it. Good surface.
2, the paving paste advocates the use of organic adhesive paste instead of cement wet paving solution, which can effectively avoid the poor matching problem, the paving effect is good.
3, if you must use the wet paste method, on the cement variety, the ordinary cement of the bed should not be more than 425 #, 325 # better. Pure cement "silver" should use 275# white cement.
4. Both the cement mortar bed and the pure cement “liquid ash†coated on the bottom of the brick should be mixed with appropriate amount of sawdust (wood raft).
(1) As the tidal dry mortar of the bed, the ratio of cement to sand is usually 1:4～1:6; when it is mixed with sawdust, the sawdust accounts for 10%-15% by weight (the rest is cement dry powder + dry sand). Whenever practicable, try to reach the upper limit of the blending ratio.
(2) For the pure cement “silver†layer immediately adjacent to the bottom of the brick, the weight ratio of the sawdust to the saw is 5% to 7% (the rest is cement dry powder), and the upper limit of the blending ratio is reached as far as practicable. For the satisfaction of mixing, the cement should be mixed well with the water, then the sawdust should be dispersed and sprinkled to continue to mix evenly; if mixed first, the sawdust is difficult to float. Hardening becomes slower after incorporation into the sawdust, but it is still suitable for operation; if necessary, a small amount of construction 107 glue can be added.
Special recommendation: According to the above principle and according to the specific conditions of the materials on the site, do some tests before the formal construction, practice and find a practical blending ratio and operating experience.
5. Arrangement principle: In the process of sequential paving, there is no restriction on the placement of the next brick relative to the upper brick. If necessary, it can be rotated 90° or counterclockwise, or 180°, in order to obtain a satisfactory overall. Color uniformity. (Note: The arrow on the bottom is purely an internal mark for the process connection in the production process, which is useless for the finished brick.)
6. When filling the joints, first clean the brick joints, then paste the four sides of the bricks for color separation protection, and then fill the joints with appropriate caulking agent. The glass-ceramic surface layer does not absorb water, and an appropriate amount of adhesive liquid can be added for reinforcing adhesion.
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