Analysis of Problems Existing in Production of Lightweight Partition Wall Panel

There are mainly the following problems in the production of partition boards

Some R&D personnel and manufacturers have misunderstandings about the "light weight" and "strength" of partition boards.

First of all, panel partition walls are not as light as possible, and "light weight" cannot be blindly pursued. There are two main ways to achieve light weight for partition panels: one is to use lightweight concrete with low density, and the other is to improve the evacuation rate.

The strength of concrete wall partitions is positively related to its density. Lightweight concrete with lower density is difficult to ensure the strength of the partition wall, and the density of lightweight porous concrete decreases, and its drying shrinkage will increase. The compressive strength of concrete wall partitions is ≥5 MPa, and the strength of the partition board is too low, and the surface of the partition board is prone to dust, which brings unnecessary trouble to the painting and subsequent decoration.

The strength of the partition board also includes its suspension force, impact resistance and bending resistance. Among them, the impact resistance and bending resistance of the partition board are important properties to ensure that it is not damaged during transportation and installation. The unreasonable setting of the evacuation rate not only affects the impact resistance and bending resistance of the partition board, but also affects its sound insulation effect and suspension force.

(2) Production process problems

Foamed concrete or air-entrained concrete is mainly used in the production of lightweight partition walls. When using the pre-foaming method to prepare the foamed concrete, it is necessary to use the foaming machine to prepare the foam, and then perform secondary stirring and mixing with the already stirred slurry.

For chemically foamed aerated concrete, although secondary stirring is not required, a "mushroom head" will be formed after foaming, and a "green body" cutting process needs to be carried out with specific tools.

Optimizing the preparation method of lightweight concrete is an important research direction to improve the production process of partition wall panels. From the production process of partition board, it can be known that autoclave curing is the key to ensure product quality. However, to achieve autoclave curing, it must rely on the autoclave powered by the boiler. However, the autoclave used in the partition board requires a large investment and has certain potential safety hazards. Under the current green and low-carbon development requirements, many regions have restricted the use of boilers that supply energy for autoclaves, and the promotion and use of clean energy. It also greatly increases the cost of the production process using the boiler. For this reason, when promoting production or expanding production capacity, partition panels not only need to solve financial problems, but also face policy constraints.

Partition wall material

The material problems faced in the production of Lightweight partition walls can be explained in terms of the properties of the lightweight concrete used and the raw materials from which the concrete is made.

Compared with air-entrained concrete, the foamed concrete prepared by the pre-foaming method has more processes. To prepare foamed concrete with stable quality (strength, density), attention should be paid to the foam stability during stirring and the foam stability at rest. The foam stability during the stirring process is related to the particle size of the aggregate used and the stirring system (stirring method, time, speed), while the foam stability at rest is mainly related to the viscosity and setting time of the slurry. When chemical foaming is used to prepare aerated concrete to produce partition board, its material and slurry properties need to be strictly controlled.

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