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Performance Characteristics of Polymer Thermal Insulation Mortar of New Chinese Building Materials in National Chinese Core Journals Wang Zhiyu Fan Xingfei 2 Wang Zhiping 3 Lin Xutian 1 (1. Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China; 2. Fenghua City Education Development Investment Co., Ltd., Zhejiang Fenghua 315500; 3. Ningbo Rongshan New Material Co., Ltd., Ningbo, Zhejiang 315800) The polymer thermal insulation mortar technically solves the problem of easy water absorption and easy cracking of the ordinary expanded perlite cement mortar, thereby opening up its application field. According to the thermal insulation performance index of polymer thermal insulation mortar combined with the characteristics of building structure in hot summer and cold winter area, calculate the thickness of thermal insulation mortar required to reach the thermal insulation standard, and also indicate the feasibility of application of polymer thermal insulation mortar external thermal insulation system in hot summer and cold winter zone. Sex.
One of the main reasons for the electricity shortage in summer in recent years is that building energy consumption is rising. There are data showing that the annual increase in air-conditioning power consumption is equivalent to the total power generation of the Three Gorges Dam. Building energy conservation is imminent. General building exterior wall insulation materials are often Due to its poor strength, its scope of use is limited or it is not conducive to the promotion of its safe construction process. The performance characteristics of polymer insulation mortar are described below.
1 Polymer thermal insulation mortar composition Polymer thermal insulation mortar refers to surface-swelled expanded perlite (glass beads) supplemented with modified expanded perlite as insulation aggregate, cement as cementitious material, fly ash The main filler material, polypropylene monofilament staple fiber is a building exterior wall insulation mortar material made of reinforced crack resistant material and various special polymer admixtures.
2 Waterproof performance of polymer thermal insulation mortar 21 Surface fusion type expansion perlite waterproof mechanism Surface fusion type expansion perlite is a new type of expanded perlite product produced by step heating in a vertical electric furnace. Compared with the porous characteristics of the ordinary expanded perlite structure, it is easy to absorb a large amount of water. The product is funded by a key scientific research project of the Pearl River Mine Fund Project of Zhejiang Province (2006C21102). In the electric heating mode, the surface of the granulating granules is instantaneously melted at a high temperature to overcome the surface tension between the holes, and is freely closed to form a continuous vitrified particle surface after cooling to maintain a complete porous hollow structure. This surface closed structure does not absorb water. Therefore, the surface-swelled expanded perlite can reduce the water absorption of the entire mortar. 22 Polypropylene monofilament short fiber waterproof mechanism Polymer thermal insulation mortar is added with polypropylene monofilament short fibers, and evenly distributed inside the mortar, so that the microcracks formed in the early stage of hardening are difficult to further develop during the development process. The addition of polypropylene monofilament short fibers is like adding a large number of fine ribs in the mortar. These fibers inhibit the cracking process of the mortar. The crack is also one of the reasons why the mortar is easy to absorb water. Less cracks can improve the waterproofness of the mortar.
23 polymer waterproofing mechanism polymer thermal insulation mortar added ELOTEX redispersible rubber powder EL0-TEX redispersible rubber powder dried in the mortar to form a water-insoluble continuous film to bond the particles together, this continuous film is passed The single dispersed particles in the emulsion are formed by fusion into a homogeneous body. The process of polymer film formation is divided into three stages: the first stage: the polymer particles move freely in the form of Brownian motion in the initial emulsion. As the moisture evaporates, the movement of the particles naturally becomes more and more restricted by water and air. The interfacial tension causes them to align together; the second stage of the particles begin to contact each other and the net-like moisture evaporates through the capillary, and the high capillary tension applied to the surface of the particles causes the deformation of the latex spheres to fuse them together to form a film; The diffusion of polymer molecules forms a true continuous film.
The performance characteristics of polymer thermal insulation mortar such as Wang Zhiyu The continuous film in the dry product of mortar can improve the overall waterproof function of the mortar.圄1 is a photomicrograph of a polymer thermal insulation mortar with ELOTEX redispersible powder.
Micro-photograph of polymer thermal insulation mortar with ELOTEX redispersible rubber powder 2.4 Water-resistance performance test of polymer thermal insulation mortar Comparison of water absorption of polymer thermal insulation mortar and ordinary perlite cement mortar The ordinary density of ordinary perlite cement mortar and polymer thermal insulation mortar Prepare 200mmXZOOmmXZOmm sample pieces, dry to constant weight and weigh them, then immerse them in water for 1h, then dry them with warm towel. Weigh the test results. Table 1. Comparison of the water absorption of polymer thermal insulation mortar and Pudao perlite cement mortar. Material insulation mortar ordinary perlite cement mortar after drying quality / kg water immersion quality / kg water absorption rate /% after drying quality / kg water immersion quality / kg water absorption rate /% average can be seen from Table 1, U, polymer insulation mortar waterproof The performance is greatly improved. 3 The crack resistance of the polymer thermal insulation mortar. The polypropylene monofilament short fiber propylene monofilament short fiber is evenly distributed in the mortar, so that the development of microcracks formed in the early stage of the hardening of the mortar is blocked. Beach for further development. The addition of polypropylene monofilament staple fibers is like the incorporation of a large number of fine ribs in the mortar, which inhibit the cracking process of the mortar and increase the fracture toughness.
The addition of polymer to the polymer thermal insulation mortar can improve the toughness and crack resistance of the thermal insulation mortar. The polymer thermal insulation mortar and ordinary perlite cement mortar were respectively made into 40mmX40mmX1600mm sample pieces, and then cured in the curing box for 28d. After being placed in the laboratory for 2 days, the test was carried out, and the flexural strength was 1.32 and 0.56 MPa, respectively. Compression test, compressive strength is 3.3, 3.5MPa, respectively, the compression ratio is 2.5, 6.25. An important indicator to evaluate the crack resistance of mortar is that the smaller the compression ratio, the stronger the crack resistance. From the above data, it can be seen that the crack resistance of the polymer thermal insulation mortar is greatly improved.
The polymer thermal insulation mortar has solved the problem that the ordinary perlite cement mortar is easy to absorb and crack easily, thereby opening up its application field.
4 Performance index of polymer thermal insulation mortar The performance of polymer thermal insulation mortar is: bulk density is not more than 450kg/m3, mass moisture content is not more than 0.8%, dry product density is not more than 520kg/m3, thermal conductivity is not more than 0.11W/(mK) The heat storage coefficient is not less than 3.5W/(m2K), the compressive strength is not less than 2.5MPa, the bond strength is not less than 0.4MPa, the frost resistance (strength retention rate) is not less than 75%, and the dry shrinkage value is not more than 3.0mm/ m. The research idea of ​​polymer thermal insulation mortar is to ensure sufficient strength according to the requirements of thermal insulation performance in hot summer and cold winter areas. According to G110<G110<Jianjian engineering veneer bonding strength test standard The strength should be not less than 0.4MPa. The weak insulation of the external wall insulation strength ensures sufficient tensile bond strength of the insulation layer in the insulation layer to ensure that the tile can be directly bonded in the insulation system.
5 External wall thermal insulation structure and thermal calculation 51 External wall external thermal insulation structural frame filled with KP1 clay sintered porous brick external wall external thermal insulation structure as interface layer (interface agent); thermal insulation layer (polymer thermal insulation mortar); protective layer (resistant Cracked waterproof mortar) finish (face tile finish).
Thermal insulation calculation of 52 polymer thermal insulation mortar 1342001 <Requirements for energy-saving design standards for residential buildings in hot summer and cold winter areas, enthusiasm index D2 3.0, external wall heat transfer coefficient KS1.5W/(m2.K); enthusiasm index D22.5 When, the external wall heat transfer coefficient KS1.0W / (mK).
In the outer wall insulation system of polymer thermal insulation mortar, the internal mixing mortar is 20mm, the base wall is 240mm, the interface layer, the insulation layer is 20mm, the crack protection layer is 8mm, and the correction coefficient of the veneer insulation mortar is 1.2. The KP1 clay perforated brick is filled with frame structure, wherein the frame occupies 15% of the outer wall area (S) CP1 clay perforated brick is 85% (Sz) as an example. The thermal calculation process is as follows: KP1 clay porous brick part heat transfer coefficient Rz is: new type Selection of Green Building Glass and Analysis Method of Energy Savings in Building Materials6 National Chinese Core Journal Yin Boyue 1濑明1 Xie Feihong 12(1 Beijing University of Science and Technology; Beijing 100083; Lanzhou Jiaotong University, Lanzhou 730070, China) Green building glass in building energy saving The advantages and disadvantages of the glass should be reasonably selected in different regions. The method of calculating the annual energy-saving evaluation of the latest sunshade energy-saving glass is proposed. This evaluation method is more versatile than the current selection method of sunshade energy-saving glass at home and abroad, which is conducive to the real energy-saving and construction of the green building glass system. Reasonable use of solar energy in winter.
China is a country with a large population, small arable land, lack of resources, high energy consumption, large sewage discharge, and rapid economic development. The per capita possession of coal, oil, natural gas, arable land, water resources and forest resources is only the world average. 1/2, 1/9, 1/23, 1/3, 1/4, and 1/6 of the value, while in the case of a severe shortage of resources, building energy consumption accounts for 28% of the country's total energy consumption. Construction of a four-part "Fund Project Science and Technology Ministry National Science and Technology Research Project" project (2004BA615A-05) students.
(2) The heat transfer coefficient Rh of the concrete beam and column is calculated according to the calculation method of the average heat transfer coefficient of the external wall of Appendix A of the energy-saving design standard for residential buildings in Zhejiang Province: (land saving, energy saving, water saving, material saving), comfort, pollution Green buildings with less environment, elegant environment and advanced management are important guarantees for realizing China's sustainable scientific development strategy, and the key to realizing green buildings is building energy conservation.
1 The key to building energy conservation is to use green building glass. 11 Building energy saving is mainly in the energy-saving building energy consumption of glass. The energy consumption of building exterior protection structure and outdoor environment heat exchange accounts for a large share. Therefore, the focus of building energy conservation is to improve the thermal performance of the envelope structure, reduce the heat transfer coefficient and reduce the heat loss. When the K value of the external wall is reduced to 1.1 W / (the m value is reduced, the K value is reduced to reduce the building energy consumption). It is not obvious (see) that the potential for energy saving through external wall insulation is very small. Therefore, the key to building energy conservation in the future is energy conservation of architectural glass.
The calculation result of 3.0 shows that the 20mm thick polymer thermal insulation mortar is painted, and the energy saving of the outer wall part can reach the standard.
6 Conclusion The addition of surface-sintered expanded perlite insulation aggregate in polymer thermal insulation mortar technically solves the drawbacks of ordinary expanded perlite cement slurry. Practice has shown that the polymer thermal insulation mortar is suitable for exterior insulation projects.
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