Aluminum material for building is usually processed into aluminum bars and profiles before assembly and coloring. The construction industry is one of the three major markets of aluminum materials, widely used in curtain walls, doors and windows, frameworks, decorative plates, railings, fences and construction templates.

1 performance

Pure aluminum has low strength and its use is limited. However, aluminum alloy with different properties can be obtained by adding a small amount of one or several alloy elements, such as magnesium, silicon, manganese, copper, zinc, iron, chromium, titanium, etc. After cold working and heat treatment, aluminum alloy is further strengthened and hardened, and its tensile strength is greatly improved.

The standard potential of aluminum is - 1.67v, and its chemical property is very active. It is easy to react with oxygen in the air to form a solid and dense oxide film. Therefore, aluminum has good corrosion resistance in the ordinary atmosphere and clean water. However, electrochemical corrosion will occur when contacting with steel or other metal materials, corrosion will occur when contacting with alkaline materials such as concrete, cement mortar, lime, etc. in humid environment, corrosion will also occur when contacting with wood, soil, etc. Therefore, proper anti-corrosion treatment is needed.

2 classification

According to different production methods, aluminum alloy can be divided into two categories: cast aluminum alloy and deformed aluminum alloy. Generally, deformed aluminum alloy is used in construction to roll into plates, foils and strips, and to extrude into bars, tubes or various complex shapes of profiles. According to their different properties and uses, wrought aluminum alloy can be divided into antirust aluminum alloy, duralumin, super duralumin and special aluminum. Industrial pure aluminum (L1-L1), antirust aluminum alloy (LF2, LF21, etc.) and forged aluminum (LD2) are generally used in the building.

3 characteristics

The biggest characteristic of aluminum and aluminum alloy is that its bulk density is about 1 / 3 of that of steel, and its specific strength (ratio of strength limit to specific gravity) can reach or exceed that of structural steel. Secondly, aluminum and aluminum alloy are easy to be processed into various shapes and can adapt to various connection processes, so as to provide favorable conditions for the most economical and reasonable section form of the building structure. Therefore, the use of aluminum alloy can not only greatly reduce the weight of the building, save materials, but also reduce the transportation and installation of components, and speed up the construction progress. The economic effect is more significant for the earthquake area and the mountainous and remote areas with inconvenient traffic. Aluminum and aluminum alloy have beautiful color, good corrosion resistance, high reflectivity to light and heat, and good sound absorption performance. Various colors can be obtained by chemical and electrochemical methods. Therefore, aluminum is widely used in roof, wall, door and window, skeleton, interior and exterior decorative board, ceiling, ceiling, handrail, indoor furniture, store container and construction formwork of industrial and civil buildings.

4 uses

The construction industry is one of the three major markets of aluminum. About 20% of the total aluminum output in the world is used in the construction industry. In some industrial developed countries, the aluminum consumption has accounted for more than 30% of the total output. The products of building aluminum are constantly updated, and the application of new building products such as color aluminum plate, composite aluminum plate, composite door and window frame, aluminum alloy formwork is also increasing year by year. In China, aluminum alloy has been used to make roofs, walls, doors and windows in industrial and civil buildings, and gradually expanded to internal and external decoration, formwork for construction, etc., which has achieved good results.

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