Research and Application of Concrete Insulation Block Building in Hot Summer and Cold Winter Area

Research and Application of Concrete Insulation Block Building in Hot Summer and Cold Winter Area, Ji Yuan, Wang Guoan (Architectural Design and Research Institute of Xuzhou Institute of Architecture and Technology, Xuzhou, Jiangsu 221008, China). The results show that the thermal performance indicators of the composite thermal insulation block enclosure structure All meet local energy-saving standards, which can effectively improve indoor comfort and save energy.

In recent years, China's annual building energy consumption has reached 25% and 30% of the country's total energy production. At the same time, with the development of the economy and the improvement of people's living standards, people's requirements for building indoor comfort are getting higher and higher. Building energy efficiency issues are increasingly showing their importance. Combining regional advantages and climatic characteristics, it is of great significance to build a new type of energy-saving materials with advantages of light weight, high strength, thermal insulation, fire resistance, etc., to build an economical, applicable, national and local energy-saving standard.

Fund Project: Jiangsu Provincial Construction Research Fund Project (S200329) 1 Climate Characteristics and Building Energy Consumption in Summer Hot and Cold Winter Regions Summer hot winter cold regions generally refer to China's Central Yangtze River Basin and its surrounding areas. The region's climate is characterized by summer. Sweltering, wet and cold in winter, small temperature difference between day and night, large annual precipitation, less sunshine. In summer, the outdoor air temperature is greater than 35C for 10~40d, and the maximum temperature is above 40C. In winter, the average daily temperature is less than 5C, the number of days is 20~80d, the relative humidity is large (up to 80%), and the sunshine rate is much lower than the north. Most of the northern sunshine rate is more than 60%, while the hot summer and cold winter regions are from east to west. The winter heat rate is gradually reduced. The highest in the east is no more than 50%, with an average of 40%. The central average is 30%. 1969ca)"b Jiangsu Lishui Salt Tanks The average west of her right is only Jihe: 1 is located in the Yangtze River basin, the climate is not good, is the region with the bad climate at the same latitude in the world. With the improvement of people's living standards, the residents in such areas have increased the energy consumption of various cooling and heating facilities in order to improve the indoor and winter comfort. However, due to the poor thermal performance of the maintenance structure, etc., even a large amount of consumption Energy is also difficult to achieve. In view of this, it is very urgent to improve the thermal environment, comfort and building energy efficiency of residential buildings in hot summer and cold winter areas. If the area is filled with energy-saving houses filled with blocks, it is necessary to use roofing, wall and door and window materials with certain insulation properties, so that the thermal insulation performance index of the building meets or exceeds the energy-saving design standard for civil buildings (G26-1995). The thermal insulation of the exterior walls and roofs is the key to energy efficient construction. Therefore, to build an economical and applicable energy-saving housing, and to achieve energy-saving indicators of 50% or more, it is necessary to research and develop new thermal insulation materials suitable for use in the region to improve the thermal performance of the enclosure structure.

2 Research on small concrete hollow thermal insulation block There are five main ways to improve the thermal insulation performance of small concrete hollow block, namely, using lightweight aggregate concrete, changing the hole structure of the block, filling the insulation material in the block hole, and using light body refilling. Blocks and composite insulation structure, etc. 12. The research team combines domestic and foreign practical experience to respectively super light ceramsite concrete insulation block, fiber concrete insulation block, sandwich composite concrete insulation block, new light body aerated block The performance of the test was carried out. It is considered that the use of lightweight concrete-filled concrete in small-sized aerated concrete in the roof heating of the hot summer and cold winter area is a thermal insulation block with composite concrete small hollow structure. Affordable.

2.1 Light-weight aerated concrete insulation block This kind of block is made of fly ash and cement as the main raw materials, using the inorganic foaming technology to produce the waste, energy-saving and heat-insulating blocks, which can form closed-cell hollow entities and conduct heat. The coefficient is about 0.094W/(mK), its thermal insulation performance is good, its strength is high, its aging resistance and fire resistance are strong. 131. Because the block uses natural foaming, its shrinkage performance is small, its thermal insulation performance is long, and the raw materials are produced. Resin and high-aluminum cement are added to modify it to avoid the problem of returning halogen and frosting. The production cost of the block is relatively low, about 110 yuan/m3 in Xuzhou area, and the construction is convenient. It does not need to be soaked and watered before painting, and is directly bonded by cement mortar, which can be widely used for roof insulation, pipe insulation and buildings. Infill wall. The research group believes that the block is used for roof insulation, which overcomes the shortcomings of small polystyrene plate heat storage coefficient and poor heat insulation performance.

When the polystyrene board is used for heat insulation in the roof of the hot summer and cold winter area, it is easy to cause cracks in the cross wall of the roof layer due to its own defects, while the light aerated concrete block has a small thermal conductivity and a density of 400kg/m3. , relatively light, and low production cost, flat rice cost is 12 yuan lower than polystyrene board left 2 cement fly ash slag composite thermal insulation block. This kind of block is about 50% fly ash, about 35% slag, 15 About 100% of cement and a certain amount of chemical activator and concrete early strength agent, the composite thermal insulation block 14 produced by self-extinguishing flame retardant polystyrene foam has a heat transfer coefficient of about 0.89 Wm2 K). Its remarkable feature is that there is no cold bridge, the heat transfer coefficient is low, the density is small, and the fireproof performance is good. The block is easy to process, and it is only necessary to increase the position and fixing device of the heat preservation profile on the production line forming system. The main dimensions of the block are 390X 190, which consists of three layers of composite structure: the base of the block is 175mm thick, the minimum thickness is 155, the single-row double-hole structure along the length direction, the minimum rib width is 28mm; the intermediate insulation layer adopts self-extinguishing resistance. The polystyrene foam profile has a maximum thickness of 50 and a minimum thickness of 25, and is provided with a dovetail-type tongue-and-groove structure along the adjacent side structural layers. Each side has a total of 6 gutter structures with a thickness of 20 mm to make the insulation layer and the base layer. It is reliably connected with the protective layer; the average thickness of the protective layer is 50mm, and the minimum thickness is 30mm. The side with the hole of the block is on the inner side of the wall, and the side is made of inorganic material for further decoration.

The structural form of the composite thermal insulation block has a significant influence on the thermal bridge because the thermal conductivity of the polystyrene foam is about 0.046 W/(mK) and the thermal conductivity of the cement fly ash slag block is about 0.48 W/(mK). The difference between the two is very large, so that the temperature field is two-dimensional, forming a local heat flux density channel. In order to reduce the influence of the thermal bridge, the thickness of the polystyrene foam in the block is appropriately increased by the test, or the shape and arrangement thereof are changed, and the influence on the heat flux density and the heat bridge is significantly reduced. In order to reduce the influence of the cold bridge, a 90-fold angle block can be used at the corner of the wall, and 90-fold linear polystyrene foam is placed in the block.

3 Application of concrete small hollow thermal insulation block 1 Project Overview The 11-story residential building of a residential district in Xuzhou, designed by our institute, has a general shear wall structure. The roof is partially northward and the south is double-sloping roof. The height of the building is 2.8m and the building is oriented south. The roof insulation layer of the project adopts light-weight aerated concrete insulation block, and the surrounding structure adopts cement fly ash slag composite insulation block.

The building has a simpler concave-convex surface, and the building body shape coefficient is 0.29. Under the lighting requirement, the external window-to-ground ratio is reasonably controlled, and the south-facing window ratio is 0.32. The north-to-window ratio is 0.30, and the summer windward surface is The difference between the wind pressure and the leeward surface is large, and it is easy to form a wind, which meets the requirements of energy-saving buildings in many aspects.

3.2 Structural measures of the envelope structure The roof is made of light-weight aerated concrete insulation block insulation, the specific structure is as shown. The right side meets the thermal insulation requirements and is economical. MEleeePushingf (2) The external wall is made of cement fly ash slag temperature block. The inner and outer walls are mixed mortar powder surface, and the inner and outer walls are all latex paint. The specific structure is as shown.

40 thick C20 fine stone concrete slab with inner wire mesh spacing 150 isolation layer: 25 cement mortar leveling 190 light body aerated concrete hollow block 2 thick polyurethane coating 3 degrees 3 cement mortar leveling concrete cast-in-place roofing panel 15 thick cement mortar flat The exterior wall structure of the outer wall structure adopts a single-layer sliding window with plastic steel, the heat transfer coefficient is 4.7W/(m2.K), and the sealing grade is grade, which has sound insulation and energy saving effect.

The partition wall of the stairwell is made of cement fly ash slag composite thermal insulation block, double-sided smeared mixed mortar, and the heat transfer resistance is 1.25m2. The cold bridge part adopts the external thermal insulation system with EPS board attached.

In the winter, central heating is adopted, household metering is adopted, and household air-conditioning design is adopted in summer. The average calculation temperature of winter heating is 18C, and the average indoor temperature of air conditioning in summer is 26°Q 3.3 Energy saving effect (1) Calculation of main coefficient. The heat transfer resistance of the composite thermal insulation block is 1.27m2 K/W, the thermal inertia index is 1.87, and the heat transfer coefficient is 0. K); the heat transfer resistance of the external wall cold bridge is K/W; the roof heat transfer resistance is Meet the requirements of local energy conservation standards DB32/478-2001.

2%, meeting the national energy saving requirements of 50%, the energy saving effect is remarkable.

3.4 Economic Benefits The composite thermal insulation block is about 130 yuan/m3, and the ordinary concrete block is about 105 yuan/m3. The composite insulation block is 12 yuan higher than the ordinary concrete block. However, the external wall of ordinary concrete block must be insulated with thermal insulation mortar or EPS board to meet the national energy-saving standards. The external wall insulation system such as EPS board is about 90 yuan per square meter, while the external wall is insulated. The cost per mortar of the mortar is about 45 yuan, and the outer wall of the composite thermal insulation block is made of inorganic materials. It is not necessary to take other measures to paste the bricks, and the construction is convenient.

4 Conclusions For the characteristics of hot summer and cold winter regions, it is recommended to use light-weight aerated concrete insulation blocks in roof insulation, and the composite retaining walls use composite insulation blocks.

From the economic point of view, it is concluded that the light-weight aerated concrete insulation block is used in the roof insulation, and the composite insulation wall using the composite insulation block is about 10% lower than the common practice.

Through reasonable structural measures and construction techniques, energy-saving problems and common disease prevention and control problems in composite thermal insulation block buildings can be solved.

(Finish)

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