Why do many families seldom use it now?
First, briefly introduce the principle of self-leveling.
Self-leveling technology is that the liquid floor material flows automatically after spreading to the ground. Of course, this flow is not arbitrary. This liquid will automatically find low-lying areas on the ground and fill them up. Finally, after the whole ground flows like a mirror, it stands still and condenses. The whole process does not rely on manual scraping, and this flowing process is the best certification for real self-leveling floor materials.
Portland cement for home decoration takes 45 minutes for initial setting and 12 hours for final setting. The strength of cement is only 70% on the 7th day after completion, and it will not reach 100% until the 28th day. In these 28 days, except for the first 24 hours, they should be watered and maintained every day. Once there is no water, the surface will crack, but which owner is willing to put down his work and water your home every day? If it is less than 28 days, 14 days is acceptable, but few people will follow the standard (the cost is too high), so it is no wonder that the cement surface loves to crack.
Some people will think that this is not a problem. You can find a good master to do it, but if you are a good master, would you like to make a few hundred square meters of tooling, or would you like to keep the home decoration less than 100 square meters for 14 days?
In addition, the demand for cement self-leveling in home improvement is very small at present, and there is naturally no stable professional workers in the field of home improvement, which is also the biggest reason why the living mold can not provide cement self-leveling. Ordinary cement self-leveling = a layer of cement, 5mm thick. Cement powder light = two layers of cement, which can reach 20mm thick. The technological requirement of cement grinding is to spread a layer of 15mm cement mortar as the base, also called coarse germ layer; Then sift out the fine sand, stir it evenly into fine cement, and cover it with coarse germ layer, about 5mm thick, also called powder layer. The cost per square meter is between 120-200 yuan. The technological advantage of cement powder polishing is that the surface layer is uniform and delicate, and it is not easy to crack when spread on the ground, even if there are cracks, it is fine and not obvious. The disadvantage is that many bricklayers can't do it, and the construction is too troublesome. But even if it takes so much time, you should understand that no matter how good the workers, no matter how expensive the materials, and no matter how rigorous the technology, the cement self-leveling will crack, but the degree of cracking is different. If you want to spread cement self-leveling, you should be psychologically prepared for its cracking and sanding, which is a part of the physical properties of the material and the embodiment of uncontrollable natural forces.
In addition, you should also understand that this most common material should be maintained as diligently as solid wood flooring, otherwise it may lead to the collapse of the overall style as soon as it is introduced.
In short, you need to accept the disobedience and instability of cement in order to enjoy the unique traces left by it when it flows freely.
Self-leveling+epoxy varnish, the disadvantages have been said before. The causes of ash and cracks are that the interface treatment is not in place and the cement grade is not enough. More importantly, the thickness of self-leveling in home decoration is about 3mm, and the inherent thickness determines that the strength will not be too high.
Polishing the original ground, using concrete sealant, hardening and brightening+epoxy varnish. This terrace is stronger.
This floor material is not expensive, but it is not cheap either, because it takes a lot of manual polishing, especially the second one, which is more expensive. Please refer to the local fee information for details.
To sum up, at present, home improvement is not very practical for self-leveling, and it is often done as the base of tiles or floors.