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Self-leveling gypsum is the abbreviation of self-leveling ground leveling gypsum, also known as gypsum-based self-leveling mortar. It is a kind of gypsum material, special aggregates and a variety of construction chemical additives prepared in the factory and mixed evenly. It is specially used for the ground. Leveled dry powder mortar.

Self-leveling mortar is an ideal material for accurate ground leveling of buildings. It can be used as a bedding base for various types of ground decoration materials, and can also be directly used as a surface floor.

It originated in Europe in the 1960s. In the European market, gypsum-based self-leveling mortar occupies a large portion of the floor mortar; the main cementitious material of gypsum-based self-leveling mortar is gypsum, and has the performance of automatic leveling, with many advantage:

Energy saving and sound insulation

It is used as a “floor heating” leveling cover layer with good thermal insulation performance (the energy saving range of floor heating is about 20% compared with other heating methods, such as the use of zoned temperature control devices, the energy saving range can be as high as 40%); it will not be like the cement mortar layer , Cracking and bulging due to thermal expansion and contraction;

In addition, the gypsum-based self-leveling mortar hardened floor has a certain elasticity, warm and comfortable feet; and has a certain sound insulation effect.

Good shrinkage and heat resistance

Gypsum-based self-leveling mortar is superior to traditional cement mortar in terms of strength stability and thermal stability, and is the preferred material for floor heating systems.

Under the same conditions, the shrinkage of cement-based self-leveling mortar is much higher than that of gypsum-based self-leveling mortar. By 28 days, the shrinkage of cement-based self-leveling mortar is about 1.17 mm/m.

With the extension of time, the shrinkage value of cement-based self-leveling mortar reaches about 1.3 mm/m after 90 days, but the shrinkage value of gypsum-based self-leveling mortar remains at about 0.19 mm/m, that is, in cement-based self-flow The excessively high shrinkage value in the flat mortar is most likely to cause the self-leveling mortar to crack.

High temperature resistance

The heat resistance of gypsum-based self-leveling at 50 ℃ is basically stable, and the shrinkage values, flexural and compressive strengths of 28d and 194d are almost the same.

Environmental protection, anti-noise

As a floor heating system, the porosity of the gypsum material itself can play a role in sound insulation and heat preservation. Gypsum-based self-leveling mortar has low density, which can reduce the bearing quality of buildings, and does not contain harmful substances such as formaldehyde, casein, VOC, and no ammonia gas release. It has significantly improved the environmental protection standards of the entire decoration, and is a green and environmentally friendly energy-saving type. product.

The self-leveling construction process is low-noise, without knocking nails or using electric tools, without sanding, and avoiding the generation of dust. Self-leveling also provides a comfortable and quiet use environment, avoiding the noisy sound of footsteps due to the uneven ground and the gap left by the keel.

Easy construction

The ground constructed with gypsum-based self-leveling mortar has accurate size, extremely high level, no hollowing, and no cracking; it is easy and convenient to operate, high efficiency, and short time-consuming (only one day can be used, and the decoration period is shortened) ; And can use pumping construction, the daily paved ground can reach 800~1000㎡, 5-10 times faster than the traditional ground material construction speed.

In the process of use, self-leveling supporting installation is adopted, which can easily meet the requirements of floor installation. It can provide a stable base surface, and the life of the base surface can reach at least 50 years;

The leveling accuracy of the ground is provided so that the joints are in the same plane after the floor is installed and installed, thereby protecting the surface material above and extending the service life of the floor material.

Beauty

The self-leveling ground leveling effect is very obvious, which makes the floor paved on the self-leveling surface more beautiful. The flat base ensures that the floor can achieve a mirror-like effect and a perfect visual enjoyment; because the new floor paving does not hit the keel The installation process method makes your indoor space more about 45mm in height, the height of the keel is about 50mm, and the self-leveling only needs about 5mm, the space is more open.

As a new material in the national green building materials industry, we always insist on selecting high-quality auxiliary materials with high quality, good performance, environmental protection and economic benefits. Gypsum-based self-leveling mortar is one of them.
It is used as a “floor heating” leveling cover layer with good thermal insulation performance (the energy saving range of floor heating is about 20% compared with other heating methods, such as the use of zoned temperature control devices, the energy saving range can be as high as 40%); it will not be like the cement mortar layer , Cracking and bulging due to thermal expansion and contraction; in addition, the gypsum-based self-leveling mortar hardened floor has a certain elasticity, warm and comfortable feet; and has a certain sound insulation effect. Gypsum-based self-leveling mortar is superior to traditional cement mortar in terms of strength stability and thermal stability, and is the preferred material for floor heating systems.

Under the same conditions, the shrinkage of cement-based self-leveling mortar is much higher than that of gypsum-based self-leveling mortar. By 28 days, the shrinkage of cement-based self-leveling mortar is about 1.17 mm/m. With the extension of time, the shrinkage value of cement-based self-leveling mortar reaches about 1.3 mm/m after 90 days, but the shrinkage value of gypsum-based self-leveling mortar remains at about 0.19 mm/m, that is, in cement-based self-flow The excessively high shrinkage value in the flat mortar is most likely to cause the self-leveling mortar to crack. The heat resistance of gypsum-based self-leveling at 50 ℃ is basically stable, and the shrinkage values, flexural and compressive strengths of 28d and 194d are almost the same.

The porosity of the gypsum material itself can play the role of sound insulation and heat preservation. Gypsum-based self-leveling mortar has low density, which can reduce the bearing quality of buildings, and does not contain harmful substances such as formaldehyde, casein, VOC, and no ammonia gas release. It has significantly improved the environmental protection standards of the entire decoration, and is a green and environmentally friendly energy-saving type. product. Gypsum-based self-leveling mortar, as a ground leveling layer, has advantages unmatched by other materials. It is an important product to replace cement and reduce carbon emissions, and has social and economic benefits of energy saving and emission reduction.

The ground constructed with gypsum-based self-leveling mortar has accurate size, extremely high level, no hollowing, and no cracking; it is easy and convenient to operate, high efficiency, and short time-consuming (only one day can be used, and the decoration period is shortened) ; And can use pumping construction, 5-10 times faster than traditional ground material construction speed. The new floor paving process method reduces the thickness and makes your indoor space more open.

In the process of use, the self-leveling supporting installation is easy to meet the requirements of floor installation. It can provide a stable base surface, and the life of the base surface can reach at least 50 years; provide the leveling accuracy of the ground to allow the floor to be installed after installation The seams are in the same plane, thus protecting the surface material above and extending the service life of the floor material.

Plastering gypsum is a common material in construction engineering. It can strengthen the cement between cements, shorten the construction period, reduce labor intensity, and improve labor efficiency. It is very popular in the construction industry.

Construction technology of plastering gypsum

The application process of plastering plaster walls is the same as plastering mortar, base treatment → plastering of cakes → preparation of slurry → bottom layer, middle layer plastering → yin and yang corners, edge sealing treatment of doors and windows → surface layer plastering.

1.Substrate processing

Make up the level difference between the masonry wall and the structural wall, clean up the wall pollutants, and fully water and moisten them, if necessary, treat with surfactant.

2. Inner beadsticking&boundary mortar painting

Determine the thickness of each inner bead according to the flatness and verticality of the wall, and use the adhesive plaster to bond the boundary mortar as the standard mortar. Generally, there are two horizontal standard mortars below 3 m, and three horizontal standard mortars above 3 m. Lay a rubber board on the ground against the wall in order to recover the dropped mortar.

3. Slurry preparation

Stir with electric mixer: Directly add the plastering gypsum mortar to clean water (water-to-powder weight ratio is about 75:100), use a high-power electric mixer to continuously stir for not less than 2min to mix evenly. The stirred material should be used within 20min～45min. It is necessary to mix and use frequently, and mix again after each mixed material is used up. It is strictly forbidden to add water to the mixed slurry before reuse. Clean up the dust on the wall surface, slag between the formwork and garbage before plastering.

4. Underlying& middle plastering

Before manual plastering, the flatness and verticality of the finished surface of the boundary mortar painting must be checked. Check with the ruler and cable. For the first plastering, it is recommended to apply and press the plastering gypsum mortar from bottom to top vertically, and horizontal direction for the second pass. The direction of two times of application and pressing must be crossed to ensure the bonding effect of the light plastering gypsum mortar and the substrate wall.

5. Edge sealing treatment of corners, doors and windows

Carry out construction strictly in accordance with the requirements of construction drawings and technical disclosure on site; Strictly control the size of door and window openings; The plastering of the interior corners of the walls, columns, and door openings requires clear line angles and protection against damage.

6. Surface plastering

When the middle gypsum plastering mortar is 60%-70% dry, use professional gypsum plastering surface mortar for surface treatment; Carry out from top to bottom, and then compact with plastering; it is required that the surface mortar and the middle layer be firmly bonded.

 

In recent years, China’s economic construction has developed rapidly, the domestic infrastructure construction has taken the leading role, the brick manufacturing demand market has been fully open, brick machine has become an essential equipment. The reasons can be found in the following aspects:

1.The main body of the automatic hydraulic brick machine adopts the frame structure and is made of high-quality steel plates welded together. High strength, less active connection, easy maintenance, etc., brick machine adopts hydraulic drive injection, has the advantages of stable operation, safety and reliability, long service life, convenient operation, compact structure, simple installation;

2.Due to the advanced control technology, reduces the brick making machine power output reactive power loss, greatly improving the energy utilization ratio and need, from the perspective of the control system and hydraulic pump, the main motor in the process of circulation to reduce to a lower even stop waiting for the link, in the brick making machine work, when brick need power supply, can quick start, to meet the operating conditions of a brick making machine.

3.Modern hydraulic brick machine with fly ash as the main raw material, cement, lime, gypsum as auxiliary materials, according to a certain proportion of uniform mixing, after the brick machine pressing molding, drying into fly ash cement brick, its strength and other indicators are higher than the traditional fired brick. In addition, the brick machine mold can be replaced, now there are many kinds of bricks, such as hollow brick, porous brick, paving brick, etc., so in the production, we also need to adjust the equipment and production according to different brick products, hydraulic brick machine equipment can change the output of the product, just replace the mold can be achieved.

4. Hydraulic brick making machine can produce road stone, anti-collision roadside stone, slope protection brick, planting grass brick, etc., use the paint instead of the mould can suppress various kinds of color brick road, after pressing product pattern clear, geometry size standards, prevent slippery beautiful, mainly used in highway construction, city streets, flood control engineering, multi-purpose, fully meet the market demand, to reduce the user’s greater investment risk.

Now the country is vigorously promoting prefabricated buildings, and prefabricated buildings are ushering in good development opportunities. Autoclaved aerated concrete slabs are used as new wall materials because of their unique advantages. They are more and more popular, but  what are the characteristics or advantages of aerated concrete slabs that are so popular with everyone?

1. What is autoclaved aerated concrete panel

Autoclaved aerated concrete panel is a new type of light-weight porous green environmental protection building material that uses cement, lime, silica sand and other main raw materials, and then adds different amounts of anti-corrosion reinforced steel mesh according to structural requirements. After high-temperature and high-pressure, steam curing, the reaction produces autoclaved aerated concrete slabs with porous crystals, which have a lower density than ordinary cement materials, and have excellent fire resistance, fire prevention, sound insulation, heat insulation, thermal insulation and other unparalleled performance.

2. Features and advantages of autoclaved aerated concrete panel

1. Lightweight: The specific gravity is only 500 ~ 650kg / m3, which is only 1/4 of the concrete and 1/3 of the clay brick. It is known as the concrete floating on the water. The design value is 650kg / m3.

2. Fire resistance: 100mm thick sheet can reach 3.82 hours, 125mm thick can reach more than 4 hours, it is a first-class fireproof material.

3. Thermal insulation: The thermal conductivity is 0.114, and the thermal insulation effect of its 125mm thick material can reach the ordinary 370mm thick brick wall. It is a new type of building material that can achieve more than 65% of building energy saving with a single material.

4. Sound insulation: the sound insulation index of 100mm thick plate (double-sided putty) reaches 40.8dB (transmission loss); the sound insulation index of 120mm thick plate (double-sided putty) reaches 45dB (transmission loss); 150mm thick plate (double-sided) (Putty) sound insulation index of 48dB (transmission loss); there are many small pores inside the AAC sheet, which has the dual performance of sound insulation and sound absorption.

5. Earthquake resistance: it can adapt to the larger interlayer angle displacement, allowing the interlayer displacement angle of 1/150, when using special contacts to reach 1/120, and in all cases of the interlayer displacement angle of 1/20 The board will not fall off at any time.

6. Environmental protection: no radiation, the hourly exposure is 12γμ / h, which is equivalent to the level on the outdoor grass; ALC is a new type of environmentally friendly building material, which can also save energy consumption during use. Building materials.

7. Carrying capacity: The inside of the board is equipped with double-layer, two-way reinforced mesh, providing external wall panels, partition wall panels, roof panels, floor panels, decorative panels, etc.

8. Crack resistance: ALC board is reinforced by anti-corrosion reinforced steel, and is cured by high temperature, high pressure and steam. It has the smallest shrinkage ratio among inorganic materials. It is caulked with special polymer binder to effectively prevent cracking.

9. Convenience: ALC board is processed by length measurement after actual measurement on site. It is a prefabricated product for the factory. It has high precision and can be planed, sawed and drilled. Dry operation is adopted, installation is simple, and the process is simple. The construction columns, waist beams, and plastering of the traditional wall are eliminated, and the putty is directly scraped, which greatly shortens the construction period, improves efficiency and construction quality.

10. Economical efficiency: ALC is used as the wall material, which can effectively increase the use area of ​​the building, reduce the energy consumption, and reach the national building energy saving standard. Under the same sound insulation and fire protection requirements, the thickness of the ALC board is the smallest, and no structural columns Auxiliary components such as ring beams and waist beams can reduce the wall load and reduce the construction cost.

11. Creativity: ALC board can be made into artistic pattern plate. After the material is installed, the effect of brick pattern, grid pattern, horizontal pattern, brick imitation, stone imitation, etc. can be achieved directly.

12. Extensiveness: It can be used for fire protection and maintenance of concrete structure, steel structure house, frame structure, frame and shear structure office building, interior and exterior wall of factory building, floor slab, roof slab, firewall, explosion-proof wall, steel structure beam and column, Soundproof walls, retrofitting of old buildings, etc.

13. Diversity: Another 50mm sheet and 30mm ultra-thin board (can be used as external wall insulation board and fireproof board).

14. Fastness: Eliminate the mixing, masonry, plastering, steel bar, formwork, concrete and other types of work in the traditional block process. Only the panel installer can do all the work, avoiding the conflicts and mutual restrictions of the types of work.

15. Uniqueness: The width of AAC sheet is 600mm, the maximum length can be 6 meters (150mm thick), and the length of other sheets cannot reach 6 meters.

3. Application range of autoclaved aerated concrete panel

1. Old building renovation project. The energy-saving renovation of existing buildings is a cause that the country has planned to implement and will continue for a long time. In such projects, it is a wise choice to use lightweight exterior wall panels. Compared with other external wall materials, light-weight insulation wall panels are simple and quick to install, with short construction period and low cost. The construction has less interference with the normal work and life of the residents, and has the advantages of waterproofing and anti-aging. People’s welcome.

2. Inner and outer partition walls of office buildings, hospitals, school classrooms, office buildings, shopping malls, supermarkets, hotels and guest rooms, and the filling walls of residential and apartment civil buildings (including toilets, kitchens, household walls, partition walls and external walls) Wall, etc.). The common feature of this type of building is that there are many compartments, the internal structure is relatively simple and uniform, and the internal structure often needs to be adjusted according to customer needs, so it is more suitable to use lightweight partition boards.

3. Interior decoration. At present, the material used as the room partition is mainly light steel keel gypsum board. Compared with light wallboard, this material has low strength, poor sound insulation, poor durability, and no obvious advantage in price. Therefore, many users are now switching to light-weight wall panels as room partitions.

4. Because of the lightness of this material, this material is the most important wall building material workshop specially used in supporting steel structures (plants / public buildings / residentials, etc.) that have been developed abroad.

More recommendations about the characteristics of autoclaved aerated concrete panels:

Our AAC production advantages

Construction technology of autoclaved aerated concrete block

AAC block & panel performance

Advantages of autoclaved aerated concrete

The modernization process of China’s green building industry is speeding up. Relying on industrialization pilot projects, prefabricated buildings with ecological protection, excellent quality and affordable and comfortable benefits are becoming the main theme of future warehouse logistics construction in the future. It can be likened to building a house like a mobile phone, putting different parts on the assembly line of a factory. According to the standard production of steel structure, doors, Windows, light bulbs and other “building parts” to the factory for modular assembly, and then these semi-finished “building parts” to the site for construction, it has overturned the construction industry nearly a hundred years of history, changed the traditional construction mode.

(1) 10-fold construction safety (100% quality assurance)

Compared with traditional buildings, steel structure components are manufactured with high precision in the factory in the early stage, and the production is controlled by high-tech production equipment. Site construction by mechanical operation, reduce the error of manual operation, quality more guaranteed, construction more safe. And the construction efficiency is improved by 4-5 times.

(2) More convenient (1/3 building weight)

Steel structure wall gives full play to the comprehensive advantage of steel and concrete, less convex column, less wall number, strong double, indoor area utilization rate increased by 4%-6%. The number of steel structure walls is small, which reduces the building weight by 2/3 compared with traditional buildings. The layout of indoor lightweight non-load-bearing walls can be changed at will, and the decoration is more optional.

(3) More earthquake-resistant (grade 9)

The number of earthquake casualties is closely related to the structure of buildings. The traditional reinforced concrete building is 7 class earthquake resistant, which is easy to collapse and cause a large number of casualties. And the steel structure building 9 earthquake resistance, ductility, can absorb more earthquake energy, so more earthquake resistance.

(4) Short construction period (1/4 of the construction period)

Because, steel structure parts for the factory according to the specification of production, site construction assembly, construction is not affected by the weather. The floor slab adopts fabricated steel truss self-supporting floor slab, which can be constructed by multiple layers at the same time, realizing three-dimensional crossover operation. The construction speed is faster, three floors a day, saving 3/4 construction period compared with traditional buildings.

(5) 93% of factory work (1/10 of field work)

The work of the site is done in the factory, outdoor work is done indoors, construction simulation and site lofting are done by computer, and 85% ~ 95% of the parts and components can be processed in the factory, which is about 60% less than the traditional construction site operation. At the same time easy to dismantle, some products can be reused, materials can be recycled. In the future, more will be delivered to the site is not scattered steel, concrete, thermal insulation board, but a piece of wallboard, stairs and other “parts”; The workers assemble these “parts” into houses with the help of machines.

(6) 1% construction waste (green building)

Traditional buildings produce 200 kilograms of garbage per square meter, and a 50,000-square-meter building emits about 10,000 tons of garbage. Construction waste accounts for 30%-50% of urban waste, and construction material transportation and construction dust account for 10-30% of urban air pollution. It consumes a lot of water and pollutes water sources. Prefabricated buildings can be finished in factories, and construction sites are free of fire, water, dust and smell. No welding, no cement, no gauze, construction waste less than 1% of the conventional building.

(7) 5-fold energy saving (1/5 air conditioning consumption)

The wall adopts light energy saving standard precast wallboard instead of clay brick, which has good thermal insulation performance, and can save 50% energy compared with reinforced concrete building, and keep constant temperature in winter and summer. It saves heating energy in winter and energy consumption of air-conditioning and other refrigeration equipment in summer, which is only 1/5 of that of traditional buildings.

(8) More environmentally friendly (green building)

Steel structure housing USES dry construction, so noise pollution, dust pollution, water pollution is very low. During the construction, the amount of sand, stone and ash is greatly reduced. The materials used are mainly green 100% recycled or degraded materials. When the building is dismantled, garbage pollution will not be caused.

(9) 20-fold air purification

Through the unique “electrostatic precipitator” and “high efficiency filter”, the indoor air is 20 times cleaner than the outdoor air, with very few inhalable particles and 100% filtration of the outdoor dirty air.