How do you think to improve the appearance quality of aerated concrete products.

The release agent and stencil are important, in addition, the material grade is coordinated to achieve continuous wrapping, and the mold is removed after the mold removal strength is reached.

With the increasing beautification of people's living environment, the appearance of concrete injection has gradually attracted people's attention, on the one hand, people decorate the concrete structure to achieve the purpose of beautifying the structure: on the other hand, they have refocused on the improvement of the appearance quality of concrete. The special passenger dedicated railway has regarded the appearance quality of concrete as an important aspect of the construction of high-quality projects.

Due to the high construction standards, high technical requirements, high quality objectives of the passenger dedicated railway, the use of high-performance durable concrete, and our understanding of high-performance durable concrete is still insufficient, therefore, how to improve the appearance quality of high-performance durable concrete, so that the passenger dedicated line railway pier body is beautiful has become a new topic in front of us.

After on-site inspection and statistics, there are some main problems in the appearance of the inspection

Surface sanding, misalignment at joints, surface bubbles, color difference, wrinkles, and slurry leakage. Through many investigations and verifications, it is found that the causes of these problems are as follows, the concrete vibrator has little experience, the vibrating rod does not meet the requirements (using 3 sets of 70mm vibrating rods), the poor quality of concrete raw materials, the instability of concrete collapse, concrete cohesion, concrete lag and water leakage, the concrete mixing time is short, the concrete transportation time is too long, the temperature does not meet the requirements, the formwork level is poor, the quality awareness is poor, the formwork processing accuracy is poor (the pier body formwork of the iron first bureau), the formwork is deformed, and the temperature difference is too large.

According to the above cause analysis, and according to the actual situation of the construction site, the following countermeasures are proposed:

Improve the skill level of the vibrator or replace the vibrator with a high skill level, improve the quality of concrete raw materials, adjust the concrete mix ratio to ensure the cohesion and water retention of concrete, put an end to the lag of concrete leakage, extend the concrete mixing time (the mixing time is not less than 90s), strictly control the concrete vibration time (20s 30s), replace the appropriate vibrating rod (use 4 sets of 50mm vibrating rods), improve the quality of the formwork (use the pier body template of Longchen steel structure), and strengthen the quality awareness of the formwork worker.

By improving the construction process, controlling the construction process, and strengthening the control of key links, the appearance quality of the pier body can reach

The surface color is uniform and consistent, the surface is smooth and clean, and there is no misalignment, slurry leakage, missing edges and corners, honeycomb, and sand line, so as to improve the appearance quality.

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Solved in terms of strength and appearance.

As an important part of wall material innovation and building energy saving, aerated concrete is an ideal wall material to replace clay bricks that has been proven in practice after years of application, and it has strong competitiveness in various wall materials. The state in the "Eleventh Five-Year Plan" clearly proposed: "the development of aerated concrete slabs and an annual output of 10-200,000 cubic meters of aerated concrete block production line, autoclaved curing, mechanical cutting."

Due to the needs of wall reform and the advantages of aerated concrete products, aerated concrete will be a new type of lightweight building material that has been vigorously developed in the past ten years.

Aerated concrete has the advantages of light weight, good thermal insulation, good sound absorption effect, and has certain strength and processability, as the filling and insulation material of the envelope structure, it is widely used in construction, and is widely valued by countries around the world, and has become the preferred building material for the promotion and development of many countries. China has become a big country in the production of aerated concrete, but also has become an independent category of emerging industries, the production of raw materials, especially the use of fly ash as raw materials, that is, the comprehensive use of industrial waste residue, environmental pollution, do not destroy arable land, the production of aerated concrete blocks, is an ideal wall material to replace solid clay bricks, can meet the requirements of the Ministry of Construction of the building energy saving up to 50% of the construction type rebuilding standard, can promote the renovation of wall materials, While making the industrial waste slag fly ash that brings serious harm to be comprehensively treated and utilized, it can enjoy a number of preferential policies such as wall reform and taxation, so as to obtain better environmental, social and economic benefits, and has broad market development prospects.

Aerated concrete products have been developed in foreign countries for nearly 100 years, and have become the pillar industry of the construction industry. Because aerated concrete has the advantages of light bulk density, high thermal insulation performance, good sound absorption effect, certain strength and processability, etc., and the production of raw materials is abundant, especially the use of fly ash as raw materials, that is, it can answer the beam comprehensive utilization of industrial waste residue, control environmental pollution, do not destroy cultivated land, and can create good social and economic benefits, is a wall material that replaces the traditional solid clay brick physiognomy, and has been strongly supported by the national wall reform policy, tax policy and environmental protection policy for many years. Aerated impulse concrete products have become an important part of new building materials and have broad market development prospects.

Aerated concrete production requires the use of fly ash, sand, aluminum powder and other raw materials.

Generally, fly ash or sand is used as raw material for aeration.

It provides the main calcareous material for aerated concrete. Cement suitable for the production of fly ash aerated concrete should be mainly selected in two aspects: cement variety and label. In production, the first grade ordinary Portland cement should be selected.

In general, in order to reduce production costs, it is better to choose ordinary Portland cement.

3.Lime: Lime is also one of the main raw materials for the production of fly ash aerated concrete, and its main role is to provide effective calcium oxide in combination with cement, so that it can interact with SiO2 and Al2O3 in siliceous materials under hydrothermal conditions to produce hydrated calcium silicate.

Therefore, lime is one of the main strengths** of this product. The available calcium oxide content of lime used for the production of aerated concrete should be greater than 65%, preferably greater than 80%. It should comply with the (JC T621-1996) standard.

4.Gypsum: Gypsum is in fly ash aerated concrete and is a regulator of the gassing process.

The regulating effect of gypsum is mainly reflected in the delay of quicklime digestion and slurry thickening. The main chemical component of gypsum is caso4. There are three types of gypsum on the market:

Raw plaster, anhydrite, and cooked plaster. In addition, waste gypsum is also generated in the chemical production process. For example, phosphogypsum discharged from the production of phosphate fertilizers, fluorine gypsum discharged from the production of fluorine chemicals, titanium dioxide produced and discharged by titanium dioxide and so on.

These plasters are low-cost and can replace natural gypsum and reduce production costs.

5.Gassing agent: Fly ash aerated concrete [2] must have a gassing material as a gassing agent to make the concrete porosity in order to form a lightweight porous structure.

6.Foam stabilizer: After the gas generator is gasped, due to the thin bubble wall, it is sometimes easy to crack and extinguish the foam under the interference of various conditions, which affects the quality of concrete. Therefore, it is necessary to add a foam stabilizer to the slurry.

Aerated concrete equipment can be produced according to the category of raw materials, quality, process characteristics of the equipment, etc. Under normal circumstances, fly ash or silica sand and slag are ground into a slurry with water, powdered lime, an appropriate amount of cement, gypsum and foaming agent, and foaming agent are stirred and injected into the mold frame, and after the static curing foam is solidified, it is cut into blocks or plates of various specifications, which are sent into the autoclave by the steaming and curing vehicle, and are cured by high temperature and high pressure steam to form porous and lightweight concrete products. The selection and quantity of Qiangyuan Machinery aerated concrete equipment production equipment are determined according to the process design scheme, and due to the different aerated concrete production processes, different equipment technologies reflecting the characteristics of the process are formed.

These technical characteristics are reflected in the cutting unit. Zhengzhou Deyi Heavy Industry Co., Ltd. involves the pouring form, mold, trolley structure, transportation of the green body, demoulding, cutting, yard frame, kettle and other equipment are similar.

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Aerated concrete raw materials include sand, fly ash, aluminum powder, etc.

The production of aerated concrete equipment is not achieved overnight, and it needs to be made through the cooperation of multiple production procedures, the most important of which is the mixing operation, which is an important factor in determining the quality of aerated concrete equipment products, in other words, it has an important influence on the production of aerated concrete equipment. So what factors affect the mixing effect?

The consistency of the slurry during mixing will also have an impact on the overall mixing effect of aerated concrete equipment products. When the slurry is too thin, it is difficult to cohesive in a short time, that is, it takes too long to carry out pouring molding, and it is easy to have edge and corner defects in the demoulding stage, which reduces the production efficiency of aerated concrete equipment production line. The slurry is too thick, there is no fluidity, and it can not be evenly stirred, so that the slurry and water are completely integrated with the material, and the mixed slurry can not prepare high-quality aerated concrete blocks.

Whether the mixing is perfect, that is, it meets the production specifications, also depends on whether the temperature of the material is within the standard range, that is, whether the temperature of the slurry is kept between 30 and 40 degrees. Too high or too low will affect its gassing effect during pouring.

Aerated concrete production process improvement program.

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