Polystyrene insulation board external wall insulation construction technology
Polystyrene insulation board (EPS) thin plaster external wall insulation system is the most widely used system in many external wall insulation systems. However, some projects that use EPS thin plastering exterior insulation have emerged with relatively serious quality problems such as cracking and shedding. The root causes of these problems are mainly attributed to materials, design, construction, etc. This article mainly introduces the quality problems caused by construction reasons and solutions. 1 Introduction to Construction 1.1 Construction Process Basics Wall Treatments * Strike Lines * Base Wall Treatments * Adhesion of Polystyrene Boards - Cleaning Caulkings - Polishing of Polystyrene Sheets - Installation of Decorative Parts - Treatment of Special Parts - Coating Paste - Laying network cloth - smearing surface mortar * leveling repair - embedded sealant * painted coating - acceptance. 1.2 Construction Environment Conditions During the construction period of the external thermal insulation project and within 24 hours after completion, the grass-roots level and the ambient air temperature should not be lower than 5*C. During the summer, the sun should be avoided from sunlight exposure. For grades 5 and above, strong winds and rain and fog must not be used for construction. Otherwise, not only the health time will change. If the material is frozen, it will also destroy the quality of the product, resulting in cracking and reduced water resistance, which will seriously affect the quality of the entire system. It is forbidden to construct on rainy days and the construction can be carried out until the surface is completely dry. 1.3 Technical Measures Before the construction, we must compile the construction plan and carry out technical disclosure and safety disclosure. The construction plan must be specific and operability is strong. For example, the position, specification, quantity, and anti-corrosion treatment of the anchor should meet the design requirements and specifications. The overlap of the fiber mesh cloth and the position and method of reinforcing the mesh cloth must be detailed for the details such as the door and window openings, balconies, awnings, parapets, and deformation joints. At the same time in the construction process to strengthen self-inspection, mutual inspection and special inspection, and timely completion of concealed project acceptance work, we can effectively control and improve the construction of the external insulation quality, in order to ensure the external wall insulation quality to provide a reliable guarantee. 2Problems during construction 2.1 Reasons for EPS thin-plaster outer wall external insulation system falling off (1) The adhesive and silica sand used cannot reach the quality and performance requirements of external thermal insulation technology or the depth of the anchoring of the anchorage when mechanical fixing is used. Insufficient and anchorage quantity is excessive, anchor bolts are installed between the board seams, and the distribution of anchor bolts is incorrect. (2) The cement paste with inaccurate proportion or the selected cement does not meet the technical requirements of the external insulation and causes the external insulation system to fall off. (3) The flatness of the surface of the grass-roots level does not meet the quality requirements of the deviation of the external thermal insulation project from the grass-roots level, and the flatness deviation is too large. The surface of the base layer contained substances that prevented the sticking and was not subjected to an interface treatment. Bonding area does not meet the specification requirements, bonding area is too small, does not meet the quality requirements of 40% bond area. The density of the polystyrene board used is less than 18kg/m3 or too large, resulting in its low tensile strength, which can not meet the bearing requirements of its own weight and facing load on the strength of the insulation system, resulting in damage to the middle of the benzene board. 2.2 Outer layer plastering surface cracks * Some external thermal insulation projects of affixed polystyrene board In the short period of time after completion, cracks appear on the thin plastering surface of the external wall, especially in the horizontal and vertical seams of the polystyrene board. It tends to produce longer horizontal cracks and longitudinal cracks. According to the analysis, the cause of the cracking is on the one hand that the mortar of the trowel layer is thicker here, and the flexibility of the glue is insufficient, the shrinkage is large, causing cracks; another reason comes from the self-shrinkage of the polystyrene board, and some construction units The performance and use requirements for polyphenyl plate are not well understood, so the surface layer cracks. These surface cracks not only affect the appearance of buildings, but also seriously damage the protective surface, affect the use of functions, and shorten the useful life. 20 Tu 4 Techniques and Abstracts 2.3 Improper handling of joints and special parts Special windows such as window sills, balconies, awnings, provocations, water fallouts, and parapets are places where problems can easily occur. Due to the poor construction of these sites, and because of different practices, there have been more adverse reactions. It is more common to have insufficient mesh splicing at these sites, improper handling of the ends, or poor sealing of the screed, resulting in leakage of rainwater or even thermal bridges. In the newly completed buildings in China in recent years, due to the poor construction of the external insulation, the leakage of the wall in the window, water fallout, provocation, etc. occurs more frequently, and it is more difficult to conduct plugging because Leakage points are not easy to find exactly. 3 Construction Proposal The construction of the expansion polystyrene foam board should be used for more than 42 days. In the construction process, all the polyphenylene plates shall be plastered before they are finished. This will allow sufficient time to complete the late shrinkage of the polyphenylene plates and prevent the plaster surface from cracking. It is advisable to stick the polystyrene board by sticking. The so-called sticking method is to spread the glue over the entire benzene board, and then serrated the trowel to flatten out and scrape off the excess glue. This method is applied to a smooth wall surface and can prevent the occurrence of empty drums. The warpage and deformation of the polyphenyl plate do not occur, and the water seepage, air leakage, and dropout due to lax edge sealing can also be prevented. The glue used by the sticking method is almost the same as the dot frame method. (3) For the insulation and renovation project on existing buildings, in addition to cleaning the paint on the surface of the old wall, it is also recommended to use anchors to reinforce the anchors. The number of anchors varies according to the height of the building. (4) In order to prevent cracking of the surface layer glue, attention should be paid to the following issues: (1) The surface layer mortar should be applied with two passes of plastering, the total thickness should be controlled at about 3mm, and the glue thickness is extremely easy to crack. 2 In actual construction, it is required that the glass fiber mesh cloth should be buried in the wiping layer, and neither can it stick to the polystyrene board nor be exposed to the surface glue. The impact test done on the same kind of mortar surface shows that the impact resistance of grids buried in different parts of the cement mortar is obviously different. After the grid cloth is closely attached to the surface of the polystyrene board, the impact is wiped. The surface layer is easily cracked; after the mesh cloth floats on the surface of the surface layer, the mesh fabric is cut off; only the surface layer buried in the mortar layer has the impact resistance. the best. 3 The gaps between the plate gaps are tightly packed with polyphenylene sheets to prevent the cracks from forming on the plate joints. 4 Conclusion In recent years, China's external thermal insulation technology has made great progress, has built hundreds of good quality of the newly built and reconstructed external insulation projects, for the country's building energy conservation has made a useful contribution . The practice of these projects proves that as long as the regularity of external insulation of the exterior wall is followed, reasonable technical requirements are put forward, and the design and construction are seriously carried out in accordance with relevant requirements, the quality of the external insulation of the external wall can be guaranteed. The 5th International Symposium on Anti-corrosion Coatings and Marine Anti-corrosion Technology was sponsored by the National Coatings Industry Information Center. The 4th International Symposium on Anti-corrosion Coatings and Marine Anti-corrosion Technology held in Beijing in July 2007 brought together China and the United States. More than 200 representatives from Japan, Malaysia and other countries came from CNOOC Research Center, COOEC, Oil Stocks Drilling Division, Base Oil Construction Pipeline Branch, Oilfield Service Company, Oil Production Technology Service Company, Sinopec Daqing Oilfield, Shengli Oilfield, and PetroChina Representatives of several oil and marine industry units, including marine companies and China Shipbuilding Industry Corporation, and researchers from anticorrosion coating production companies and universities and research institutes, aim at the anti-corrosion coating market, especially the marine and petroleum system anti-corrosion coating market status and new The development of technology has conducted in-depth and extensive exchanges. The National Coatings Industry Information Center has decided to hold the "5th International Symposium on Anti-corrosion Coatings and Marine Preservation Technology" in Qingdao City in early July 2008 in response to the requirements of numerous application units and anti-corrosion paint manufacturers. Institutes, universities, paint manufacturers, coating companies, etc., collected related papers related to anti-corrosion coatings and paintings. After being reviewed and accepted, they were included in the proceedings of this conference. Theme of the conference: The Road to Environmental Protection of Marine Anti-corrosion Coatings Contents: Research hotspot, direction of environmental protection, market status, latest international standards, and detection methods for anti-corrosion coatings. Writing requirements: The text of the paper is clearly defined, clearly structured, and clearly illustrated. Please attach,
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Different rollers will brush different effects, long hair rollers will brush out some fine texture, concave and convex feeling, similar to the texture effect. The paint surface after short wool roller besmear is more uniform, smooth, without concave and convex feeling, in the wool is between the two.
Roller brush is mostly made of wool and foam plastic, which can be divided into paint drum brush, hair drawing drum brush, floor paint drum brush, flat coating drum brush, etc., mainly used for large-area paint rolling in architectural decoration engineering. And can be used for coating and rolling all kinds of paint, such as: latex paint, anti-rust paint, internal and external wall paint, wallpaper glue, etc.
Note:
The use of drum brush as long as the straight brush can be wiped, if you want to daub evenly, the drum is best in the paint bucket to be fully absorbed, and then take out a few rolling on the inclined plane, press out the excess paint and then begin to brush the wall.
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