Lightweight composite concrete external wall and production method

Abstract

The invention relates to lightweight concrete external walls and discloses a lightweight composite concrete external wall and a production method. The lightweight composite concrete external wall comprises a steel bar bracket, an embedded part fixed in the steel bar bracket, a concrete matrix which is used for filling and cladding the steel bar bracket and a coating layer which is coated on the outer side of the concrete matrix; the lightweight composite concrete external wall is prepared from the following raw materials in parts by mass: 100 parts of portland cement, 100 parts of water, 80 parts of crushed stone aggregate, 8 to 12 parts of strongly acidic action exchange resin, 30 to 40 parts of natural sand and 7 to 10 parts of polytetrafluoroethylene filler. The production method comprises the following steps: pouring lightweight composite concrete obtained by mixing the raw materials into an external wall mold provided with the steel bar bracket and the embedded part; after the lightweight composite concrete is solidified and cured, obtaining the concrete matrix; coating the concrete matrix with a coating layer, so as to obtain the lightweight composite concrete external wall.The carrying load of an external wall fixing bracket is reduced, and the compression resistance and bending strength of the lightweight composite concrete are improved; the possibility that the external wall is fractured or crushed when being impacted is reduced.

Description

technical field [0001] The invention relates to a lightweight concrete exterior wall, in particular to a lightweight composite concrete exterior wall and a production method. Background technique [0002] The building exterior wall is a common component in existing house construction. It uses metal pendants to directly hang the decorative building panels on the wall or hang them on the steel frame. There is an existing concrete exterior wall, which is composed of a concrete matrix composed of foamed concrete, equipped with embedded parts embedded in the concrete matrix and a decorative layer coated outside the concrete matrix. rack fixed. Among them, foamed concrete, also known as foamed concrete or lightweight concrete, is to fully foam the foaming agent mechanically through the foaming system of the foaming machine, and mix the foam and cement slurry evenly, and then pass through the pump of the foaming machine. It is a new type of lightweight thermal insulation material...

AI Technical Summary

Problems solved by technology

However, if the coarse aggregate is directly used, a large number of bubbles generated by the foaming agent will be adsorbed on the surface of the aggregate, resulting in low bonding strength of the aggregate on the outer surface of the concrete and easy to fall off. At the same time, the specific surface area of ​​the coarse aggregate is small. The formed closed pores will accumulate free water, promote the alkali-aggregate reaction, and cause the concrete to expand and crack, resulting in poor practical use of the foamed concrete exterior wall

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