Analysis of problems in waterproof construction of waterproof coatings Waterproof coating materials are a new material widely used in industrial and civil buildings after asphalt waterproofing and mortar waterproofing. The coating film is composed of various synthetic polymer waterproof coatings and caulking materials, and some are coated with only a few layers of coating film, and some are placed with glass fibers, synthetic fibers or non-woven reinforcing cloth between the coating films to form a kind of coating film. Enhanced coating waterproof layer.
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Because the coating waterproof material generally has good material properties, good waterproofness, strong adhesion and elongation, it can be applied at normal temperature and can be applied to various complex shapes of structural base layers, especially for yin and yang angles and trenchless rainwater. The closure of the mouth and end. Therefore, it has been developing in the near future. However, from the perspective of the use effect in recent years, the quality of the film waterproofing project cannot be ignored. The relevant issues are as follows:
1. It is not completely compatible with the construction surface layer. It is commonly used in solvent and water emulsion type. Solvent type waterproof materials are used more, such as neoprene waterproof coating and reclaimed asphalt waterproof coating. They can be sprayed or brushed separately. It can also be used together with glass cloth. Water-based waterproof coatings are also widely used. There are also some waterproof coatings based on rubber or resin, such as neoprene-haipalon coating and polyurethane thick coating. The performance, weather resistance and stability are relatively reliable. However, in practice, it is easy to occur that the construction surface layer cannot be completely adhered to. If the coating film cannot be adhered to the construction surface, it will not have a waterproof function. The main reason is that the construction surface is not dry, which is related to the ambient temperature during construction.
2. Whether the coating film thickness and uneven coating film waterproofing can be effective depends almost whether the uniform thickness is obtained after the conjunctiva, and whether the construction surface of the cement mortar is smooth and smooth. Since concrete and cement mortar are allowed to have certain errors during the construction process, this results in unevenness of the thickness of the coating film.
3. The dry cracking of concrete affected by structural cracking usually occurs within 1~6 months after concrete pouring. The width of initial cracks is above 0.03 mm. The corners of reinforced concrete boards after 1 year are often obvious. Oblique cracks or obvious lateral cracks in the center. Once cracking occurs, it is often affected by temperature changes, shrinkage and swelling, etc., which gradually enlarges the cracks. In addition, factors such as uneven settlement of foundation or earthquake, the crack degree is more obvious, and some engineering crack width is above 5 mm. There are also many. Under the above circumstances, generally only 1~2 mm thick coating film is difficult to break, even if it is not broken, the coating film becomes thin and cannot be restored due to being pulled, and becomes a tangible and weak overhead over the crack. The thin surface, which is shaped like a very thin wooden deck, is damaged by external forces. Once damaged, the rain will immerse into the entire crack, which is the source of building leakage.
4. Influenced by the quality of the construction base The current roof waterproofing project usually begins with a layer of cement mortar screed. Since the waterproof material of the coating film is adhered to the cement mortar, as the cement mortar cracks, it bulges (loose) and loses its waterproof function. Compared with the coil material, since the coating film is thin, it is more susceptible to the quality of the cement mortar, and this point should be taken seriously. Http://news.chinawj.com.cn 
Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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