Analysis on the superiority of alloy aluminum plate system in early formwork removal

It is reported that the alloy aluminum plate system conforms to the national regulations on energy saving, environmental protection, low carbon and emission reduction of construction projects. In terms of environmental protection, it can save materials, improve the utilization rate of materials and the value of recycling, and reduce the waste and garbage of construction. The stability and safety of alloy aluminum formwork are high, and the ability to bear the weight of floor concrete, construction load and the lateral pressure of wall concrete is high, and the appearance quality of concrete can reach the results of concrete. Building construction should be modular and factory-oriented, so as to improve the normalization of construction and management; The construction period is short, which can improve the working efficiency of workers and reduce the cost, working procedure and operation of labor. Analysis of the superiority of the aluminum alloy formwork system in early form removal;

The alloy aluminum plate system integrates the template quick release system. Taking a project as an example, its standard layer structure needs to be constructed for 4 days, and its template removal and installation can be completed in 2 days, and 47 standard layers can be completed with one template. According to relevant standards, if the span of bearing point of concrete bearing plate is less than 2m, as long as the concrete strength reaches 50% of the design mark, the bottom formwork and support can be removed within 2m, which is 75% in 7 days. Combined with the law that the early strength of concrete increases rapidly, the formwork support can be removed within 17 days after coagulation, and the formwork support can start to turn around again.

The quick-release formwork system is based on this theory. During the construction of aluminum alloy formwork, a fixed support is set every 2m span, and the fixed support is removed in strict accordance with the specifications according to the actual span and form of the structure, that is, the concrete strength of the beam-slab span of 2-8m should reach 75%, and the fixed support can only be removed when the cantilever structure is over 8 m and reaches 100.00%, and the formwork and support around the fixed support can be removed within 7 days.

According to this theory, the traditional formwork system can be quickly dismantled, but it also increases the materials and installation work of the formwork, which is not environmentally friendly. However, the faster the aluminum alloy plate can be designed, the more labor-saving, material-saving and environmentally friendly.

Analysis of quality problems of alloy aluminum slab

It is reported that the continuous casting and rolling of aluminum alloy slab has the characteristics of compact solidification structure, small center porosity, slight center segregation, fine columnar crystals, small secondary dendrite arm spacing and small head-tail temperature difference. Therefore, theoretically speaking, continuous casting and rolling has certain advantages in producing thin aluminum plates, but this process also has the problems of low surface quality of slabs and small application scope of products:

First, the surface quality:

For aluminum slab continuous casting and rolling, the surface quality is one of the main factors affecting its quality grade. The common defects in production are surface slag inclusion, surface longitudinal cracks, etc. For aluminum slab, due to its thin thickness, large width-to-thickness ratio and large surface area, a large amount of mold flux is needed.

If the mold flux is not selected properly, some mold fluxes with higher melting point will not melt, which may lead to smaller opening of the mold with slag, smaller melting space for solid slag, and increase the turbulence of the liquid surface, which is easy to involve the mold flux into the longitudinal cracks of the aluminum alloy slab. On the one hand, it is related to various stresses on the shell surface of the solidified slab, for example, the thermal stress caused by the temperature difference in the initial slab shell in the mold, the static pressure of molten aluminum, Static pressure is related to dynamic friction caused by shrinkage stress of solidified shell, bending stress caused by liquid level fluctuation, and tensile stress during continuous casting. On the other hand, the formation of longitudinal cracks in aluminum slab is related to solidification structure of slab, which is usually under the slab skin during continuous casting of aluminum slab.

Because of the high solidification speed, impurity elements solidify before precipitation, and when the solidification front advances to the columnar crystal region, impurity elements are enriched and precipitated, which reduces the melting point of this region and forms a low plastic region. Under the action of small external force, it will also become a crack source and then develop into a subcutaneous crack, which will extend to the slab surface to form a fine longitudinal crack defect, and the longitudinal crack begins with dendrite. It ends between columnar crystals and dendrites, and the alumina scale of aluminum slab that expands along the growth direction of dendrites is very thin and sticky on the surface of slab. It is difficult to clean the alumina skin, so the surface quality of tropical zone produced by aluminum slab has always been a big problem.

Second, the product range:

Although the continuous casting and rolling production line of alloy aluminum slab can cover most varieties of hot rolled strip aluminum, some varieties with high performance requirements and high added value cannot be produced yet. Continuous casting and rolling of aluminum slab can well control the aluminum nitride precipitated in the rolling process, which is beneficial to the production of deep drawing sheet, but the surface quality of aluminum slab produced by continuous casting and rolling is poor, which is unfavorable to the production of deep drawing sheet.

Link-B2B is a professional supplier listing service platform which will provide high quality and trustworthy supplier list to international buyers. If you are looking for alloy aluminum plate  suppliers, feel free to visit Link-B2B.com and send a request.