Practical Analysis of Exterior Wall Thermal Insulation Energy-saving Materials


Release time:

2015-07-22

Author:

New Earth Group

Source:

Practical Analysis of Exterior Wall Thermal Insulation Energy-saving Materials

With the continuous development of the economy and the improvement of living standards, China's energy consumption is also increasing, therefore, China's governments at all levels of building energy efficiency are attached great importance to the implementation of mandatory promotion policy, after several years of efforts to promote the application, has achieved initial results. Improving the efficiency of building insulation and energy saving and the quality and technical level of building insulation and energy saving engineering is the focus of research and application of insulation and energy saving technology. Line comparative analysis, for insulation and energy-saving building materials manufacturing, building energy-saving engineering design and construction, quality supervision departments and other related industries practitioners (architectural designers, production and technical personnel, construction personnel, engineering supervision personnel, quality inspection personnel, etc.) reference.

1. expansion polystyrene board thin plastering exterior insulation system

Expanded polystyrene board thin plastering exterior thermal insulation system was the first to be popularized and applied in Beijing, and quickly extended to Tianjin, Hebei, Northeast China, and even some southern provinces such as Shanghai, Jiangsu, and Hunan. It is still widely used in exterior thermal insulation projects, especially in the cold areas of the north. It is one of the product systems that are popularized faster in thermal insulation and energy-saving projects in my country. The thermal insulation material it uses is mainly polystyrene foam board, auxiliary materials and materials include special expanded mushroom anchor nails, alkali-resistant glass fiber grid cloth, polymer bonding mortar, plastering mortar, exterior wall coating or decorative tiles, etc. The construction method is to paste polystyrene foam board on the wall with polymer bonding mortar, riveting with special expanded mushroom anchor nails, sticking alkali-resistant glass fiber grid cloth on polystyrene foam board with anti-seepage and anti-crack mortar, then wipe 3mm of anti-seepage and anti-crack-mortar, brush exterior wall coating or make decorative tiles. Its advantages are: excellent heat preservation and energy saving efficiency, and the construction is relatively standardized.

2. rubber powder polystyrene particles exterior insulation system

The rubber powder polystyrene particle external wall insulation system is a main material used in the external wall internal and external insulation and energy saving after the expanded perlite insulation material. It is widely used in the south and north, and is widely used in Jiangsu, Anhui, Jiangxi, Hunan, Hubei and other provinces. Its main thermal insulation material is polystyrene particles, and the auxiliary materials are polymer rubber powder, alkali-resistant glass fiber grid cloth, expanded mushroom anchor nails, etc. The construction method is to add water to premix polystyrene particles and polymer rubber powder into slurry form (polymer rubber powder and polystyrene particles are packaged separately, and the use is to add water and stir evenly), wipe the wall flat, each layer thickness is 20mm, and then paste alkali-resistant glass fiber grid cloth after drying, apply 3~5 ㎜ of anti-seepage and anti-crack mortar, and fix the facing brick with galvanized steel wire mesh and expanded mushroom anchor nails, and then brush exterior wall paint or make brick decoration. The advantages are: good heat preservation and energy saving effect, easy bonding between heat preservation layer and wall, low requirement on flatness of base wall, simple construction process, low engineering cost, generally no large area cracking, hollowing and falling off problems, and technically feasible. Since the mixed slurry is as easy as powder plastering traditional cement mortar, and the bonding strength is very good, it is easy to popularize. Disadvantages include: poor fire resistance, but better than the expansion of polystyrene board thin plastering system. The main technical contradiction between the thermal insulation effect of the rubber powder polystyrene particle thermal insulation system and the strength of the thermal insulation layer is: the more polystyrene particle content in the thermal insulation slurry, the smaller cement powder content, the lower the thermal insulation layer strength, and the better the thermal insulation energy saving effect; If the cement powder content in the thermal insulation slurry is more, the polystyrene particle content is smaller, the strength of the thermal insulation layer is higher, and the thermal insulation energy saving effect is worse.

3. inorganic thermal insulation mortar (or vitrified hollow bead thermal insulation mortar) system

Inorganic thermal insulation mortar (or vitrified hollow bead thermal insulation mortar) system is a new type of thermal insulation material. The thermal insulation material uses inorganic hollow vitrified beads and is matched with polymer glue slurry, which can make the thermal insulation layer per square meter consist of tens of thousands and hundreds of millions of micro hollow thermal insulation vitrified beads. The advantages of this high-density integrated micro hollow thermal insulation system are as follows: 1, because the vitrified beads are inorganic materials, good fireproof performance; 2, compressive strength and shear bond strength is high; 3, good weather resistance, small shrinkage, no grid cloth; 4, the construction is also very simple, the project cost is low. Disadvantages are: due to the high density of inorganic vitrified beads, the dry density of the finished product is generally 420~450 ㎏ ﹤ m3, so its thermal conductivity is also large, generally above 0.096w ﹤ m k, and its heat preservation and energy saving effect is poor. in order to achieve the same heat preservation and energy saving effect as rubber powder polystyrene particles, the general measure is to thicken its heat preservation thickness, while vitrified beads are of high density, thickening its insulation thickness also increases its self-gravity, which definitely affects the stability of the long-term safe use of the insulation system. Therefore, when the energy-saving requirement reaches 50 ~ 65%, the insulation system should not be used and cannot reach the required energy-saving effect.

The key to the construction of wall base, thermal insulation and energy-saving layer and exterior wall decoration lies in materials and technology. Construction is a long-term plan. The level of construction technology and decoration technology reflects the cultural and scientific and technological level of a country and a nation, which is related to future generations. It is not only to look at the present, whether the technology and quality of thermal insulation layer are excellent or not will not only directly affect the efficiency of thermal insulation and energy saving, but also to the late exterior wall decoration project caused great quality and safety risks. Saving energy and reducing energy consumption is a long-term policy of the country and an important measure for the sustainable development of the national economy.

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