(Nantong Xinhua Construction Group Co., Ltd., Nantong, Jiangsu 226007, China) It has the characteristics of good adhesion, durability and combustion performance, such as Class A fire protection, low carbon environmental protection, energy saving and waste disposal. It is in line with the civil building exterior wall insulation system of the Ministry of Public Security and the Ministry of Housing and Urban-Rural Development. Interim Provisions on Fire Protection of Exterior Wall Decoration (Jongtongzi) [2009] No. 46 and the Ministry of Public Security's Notice on Clarifying the Relevant Requirements for Fire Supervision and Management of Civil Building Exterior Insulation Materials, No. 65, Applicable to External Wall Insulation and Fire Prevention The isolation belt meets the need for fireproof safety insulation materials for exterior insulation. The article introduces the performance of A-grade fire-retardant foam insulation board and the main points of external wall insulation construction.
The closed cell ratio of Class A fire-retardant foam insulation board is >95%, and the high closed cell ratio makes the heat transfer caused by air flow low, so the heat insulation performance is excellent. The thermal conductivity of Class A fire-retardant cement insulation board can reach 045W/mk, which is slightly lower than that of polystyrene board, which can meet the needs of building insulation.
Class A fireproof foaming cement insulation board is light in weight. The density is 150300kg/m3, which can meet the requirements of the external wall insulation board and reduce the cost. At the same time, the cement insulation board and the wall are easy to bond.
Grade A fire-retardant cement insulation board has high compressive and flexural strength, achieving relatively uniform density and high strength, and is not easily broken by use and transportation.
Class A fire-retardant cement insulation board will not burn under high temperature, and there is no release of toxic gas. It is a safe and environmentally-friendly waste material.
Class A fire-retardant foam insulation board has a life of more than 50 years and can be used for the same life as buildings.
The specification of Class A fire-retardant foam insulation board 250mmX250 II, Class A fire-retardant cement insulation board construction base wall experience acceptance. All kinds of household pipelines, water drop pipe brackets, embedded parts, etc. on the door and window frame and wall are installed according to the design.
2 The shear wall flatness is checked with a 2m ruler. When the deviation is greater than 20 awake, the 1:3 cement mortar is used for leveling.
The masonry wall is leveled with 20 thick 1:3 cement mortar.
The base wall and screed should be dry.
The ambient temperature of the construction site and the surface temperature of the wall shall not be lower than 5C within 24 hours after construction, and the wind shall not exceed 5 levels.
Effective measures should be taken during summer construction to prevent rain from scouring the wall.
Base wall treatment with a special adhesive, paste cement insulation board - buried mesh cloth, smear polymer mortar, a drill hole and mounting fixtures, a surface layer of polymer mortar, a spray (coating) surface coating or paste The tile is cleaned up and the finish is checked.
At the base layer treatment, surface residues such as floating pulp, floating ash, and cement blocks on the outer wall surface should be shoveled with a blade.
The horizontal line is measured at the position where the measuring line is placed, the line is slated, and the horizontal line is placed at the appropriate position on each floor. The line should be horizontally circled on the outer wall to control the verticality and flatness of the insulation board.
The polymer bonding mortar is configured according to the mixing ratio provided by the manufacturer's instructions. The person is responsible for the strict measurement. Stir for 5 minutes with a hand-held electric mixer until the mixing is uniform and the consistency is moderate. The mixture should be used up within 1 hour.
Pre-adhesive mesh: The pre-adhesive mesh is pre-applied to the outside of the door and window opening, on both sides of the deformation joint, and the side of the thermal insulation board on the side of the insulation wall is 72.03.
5 paste cement insulation board: the insulation board diagonal error is less than 3mm, the size tolerance is ±2. If you need to cut, you can use small cutting saw to cut, according to the actual size of the wall, typesetting, arrange in horizontal order, up and down The yin and yang angles should be treated with mistakes. When the cement insulation board is glued to the wall, it should be evenly squeezed, and the flatness and verticality should be checked at any time with a 2m ruler and a support plate. (1) Apply the special adhesive to the back of the cement insulation board. The thickness of the adhesive is about 3. To ensure a firm bond, it is best to use the full-stick method. Point method. Stripping method: Use a toothed file to evenly spread the special adhesive horizontally on the composite foamed cement board. The strip width is 10, the thickness is 10, and the middle distance is 50. The strip method: using a trowel around each board And a special adhesive for the intermediate wipe, and then a gray cake having a diameter of 50 and a thickness of 10 is applied in the separation zone of the composite foamed cement board. (2) The foamed cement insulation board with the special adhesive applied is quickly pasted on the wall surface to prevent the surface from crusting and lose the bonding effect.
The bottom layer of polymer mortar: (1) the configuration of the polymer mortar is the same as the special binder; (2) the polymer mortar is evenly spread on the cement insulation board, the thickness is 2mm. Press into the grid cloth: (1) The mesh cloth should be cut according to the length and width requirements of the working face, and the overlap width should be left; (2) The mesh cloth should be turned around the holes such as doors and windows, and the four corners should be reinforced with a layer of mesh cloth. The whole mesh The cloth should be overturned around the hole and attached to the mesh cloth; (3) The front and side of the cement insulation board at the opening of the hole and the mesh cloth are coated with polymer mortar (only the cement insulation board end is allowed here) Wipe the polymer mortar). The pre-extracted mesh cloth is flipped along the thickness of the plate and pressed into the polymer mortar; (4) the entire mesh cloth is stretched and stretched horizontally, paying attention to the inner side of the mesh cloth facing the inside, The trowel has the upper and lower sides to smooth the mesh cloth so that it fits snugly.
The width of the mesh cloth in the horizontal direction is not less than 100, and the length of the vertical joint is not less than 80. The vacant portion of the bottom mortar is supplemented with polymer mortar at the joint, and the mesh cloth shall not be wrinkled, hollowed or warped; 5) At the corner of the concave and convex line, a narrow mesh cloth should be buried in the bottom polymer mortar, and the whole mesh should be laid on the narrow mesh cloth with a lap width of 80; (6) the wall and the yin and yang The two sides of the corners of the grid are overlapped by two-way corners, and the width of each side is not less than 200. The nylon expansion sleeve is installed: the hole is designed according to the designed anchor arrangement, and the expansion sleeve is inserted. Anchor anchoring should be carried out during the first pass of the plaster (and pressed into the mesh). Use an electric drill to punch holes in the corner joints of the foamed cement board, insert the anchor into the hole and screw the flat surface of the plastic disc. In the plastering mortar, the effective anchoring depth: the concrete wall is not less than 25mm; the lightweight wall such as aerated concrete is not less than 50mm. The wall height is below 20m, 45 anchors per square meter, and more than 20m per square meter. Anchors.
The surface layer polymer mortar: (1) After the bottom layer of polymer mortar is applied and pressed into the mesh cloth, when the mortar is solidified until the surface is not sticky, the surface layer polymer mortar is started, and the thickness of the surface is covered to cover the mesh cloth. The total thickness of the polymer mortar is 2.53.0. (2) In order to improve the impact resistance of the external wall, a layer of mesh cloth should be added and the two sides should be carried out according to the first two steps. The total thickness of the polymer mortar is about 3.54. 0mm. Construction of deformation joint: The metal cover seam of the wall deformation joint should be positioned according to the design before the cement insulation board is pasted and fixed firmly with the base wall.
Construction of the finish layer: (1) When the finish layer is made of water-soluble high-elastic paint, the unevenness of the polymer mortar should be repaired before construction, and sanded with fine sandpaper, and then the paint is applied. (2) When the facing layer is made of tile, the adhesive and joint mortar should be made of special tile adhesive.
III. Conclusion Class A fire-retardant foam insulation board. After years of research and development, the technology has gradually matured. With the increase of building fire prevention, this product will gradually be promoted and applied, becoming one of the leading products of building insulation in the future. .
Member of the Expert Committee of the China Research Association, project management expert of the China Installation Association, member of the China Commodity Industry Expert Committee, academic advisory board member of the China High-tech Enterprise Journal, senior engineer, senior economist, national registered first-level construction engineer, national registered supervision engineer, Research direction: construction engineering technology and project management.
(Responsible editor: Zhao Xiujuan) 2012.03 high-tech private in 73
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