Foam concrete formula:
The main formulations of foamed concrete are cement, water, fly ash, foaming agent, aggregate and admixture. Other ingredients such as chopped fiber, organic polymer, etc. Can also be added as needed. Cement is the main influencing factor and source of foam concrete strength. Every kind of foam concrete with absolute dry density has the best cement content.
Fly ash has a wide range of sources, low price and certain activity, which can significantly improve the strength of foamed concrete and improve the effect after molding. There are many substances that can produce foam, but only when the foam is mixed with mortar, it is stable enough to not affect the setting and hardening of cementitious materials, can it be used to prepare foaming agents? . Commonly used additives for foamed concrete are dispersant, waterproof agent, early strength agent and accelerator.
Characteristics of foamed concrete:
(1) thermal insulation: the thermal conductivity is 0080-0. 135W/(m? K), the thermal resistance is about 20-30 times that of ordinary concrete.
(2) Water-resistant foamed concrete has small water absorption rate, independent closed bubbles, good integrity and water resistance.
(3) Durability: the same as the engineering life of the main body.
(4) Simple construction: automatic operation can be realized only by cement foaming machine.
(5) Lightweight: the volume is about1/5 ~110 of ordinary cement concrete.
(6) Integrity: It is closely integrated with the main project, and there is no need to leave gaps.
(7) Sound insulation: it contains a large number of independent bubbles, which are evenly distributed and have sound absorption capacity five times that of ordinary concrete.
(8) compressive strength: the compressive strength is 0.6-5.5Mpa.
Foam concrete application:
(1) is used as the rock wall of the port.
(2) Used for landscaping. Can be used as garden rockery, trash can, table and stool, etc.
(3) track and field track and field construction.
(4) Pipe backfilling. The method of foam concrete backfilling can solve the problem of underground abandoned oil tanks and? Sewage pipes and other problems that lead to fire or collapse.
(5) Lean concrete filling layer. The used hose can be bent at will, and the foam concrete has great adaptability and working degree.
(6) Foamed concrete used in roof slope has the advantages of low price, light weight and low cost. And the construction speed is fast.
Application scope of foamed concrete:
Foamed concrete is widely used in energy-saving wall materials because of its good characteristics, and it is also used in other aspects. At present, the application of foam concrete in China is mainly the cast-in-place insulation layer of foam concrete on the roof, foam concrete block, foam concrete lightweight wallboard and foam concrete compensation foundation. However, making full use of the good characteristics of foamed concrete can continuously expand its application fields in building engineering, speed up the progress of the project and improve the quality of the project, as follows:
(1), used as a retaining wall. Mainly used as the rock wall of the port. As a lightweight backfill material, foam concrete can reduce the vertical interception load and lateral load of the shore wall. This is because foam concrete is a rigid body with good bonding performance, and it does not exert lateral pressure on the bank wall along the periphery, which reduces settlement, maintenance costs and saves a lot of expenses. Foamed concrete can also be used to improve the stability of embankment slope, replacing part of the soil on the slope with it, and reducing the force that affects the stability of slope due to quality reduction.
(2) Construction of sports fields and track and field runways. Permeable foam concrete with strong drainage capacity is used as a light foundation, and the surface is covered with gravel or artificial turf as a sports ground. The density of foamed concrete is 800-900kg/m? This kind of playground can be used for hockey, football and tennis. Or cover 0.05m thick porous asphalt layer and plastic layer on foamed concrete, which can be used as track and field.
(3) As a sandwich ingredient. Foamed concrete can be used as the inner core of precast reinforced concrete members, which makes it have good properties of light weight, high strength and heat insulation. Usually the density is 400? -? 600kg/m？ Foam concrete.
(4), pipe backfill. Underground abandoned oil tanks and pipelines (including crude oil and chemicals). Cavities such as sewage pipes are easy to cause fires or landslides, and using foam concrete to backfill can solve these problems with less cost. The density of foamed concrete depends on the pipe diameter and groundwater level, and is generally 600- 1 100kg/m? .
(5), lean concrete filling layer. Because of the flexibility of hose, foam concrete has great workability and adaptability, so it is often used to fill lean concrete. If the thermal insulation requirements are not very high, the density 1200kg/m? Lean concrete filling layer, with an average thickness of 0.05m; If the heat preservation requirement is very high, what is the density of 500kg/m? The average thickness of lean concrete filling layer is 0. 1-? 0.2 meters.
(6) Roof slope. The roof slope adopts foam concrete, which has the advantages of light weight and low cost. The construction speed is fast and the price is low. The slope is generally 10mm/m, the thickness is 0.03-0.2m, and the density adopted is 800? -? 1200kg/m？ Foam concrete.
(7), tank foot support. Foam concrete is poured at the foot of steel storage tank (containing crude oil and chemicals), which can form a convex foundation when necessary, and can ensure that the support of the whole tank bottom is in the best stress state during welding. This kind of continuous support can make the storage tank adopt thin plate bottom. At the same time, the raised foundation is also easy to clean. The use density of foamed concrete is 800- 1000kgm? .
(8), used for landscaping. Making foamed concrete with bulk density of 600- 1000kg/m? , can be used for garden rockeries, trash cans, tables and stools, etc.
(9) National defense (modern warfare uses information and advanced mobile devices as attack tools). This foamed cement can be used for immediate emergency repair of military projects damaged by enemy bombing, such as airports and important traffic roads. With our equipment and technology, projects damaged by the enemy can be repaired quickly. The experimental results show that the aircraft can take off and land within 10 minutes after the repair, and the chariots can pass through.
(10), others. Foamed concrete can also be used for thermal insulation filling of firewall, sound insulation floor filling and tunnel lining backfilling; And the isolation of power supply and water supply pipelines.
Process flow:
Check the quality of cement, sand and foaming agent → mixture ratio test → technical disclosure → prepare machines and equipment → clean the basement → find the elevation → mix and pour concrete → leveling and calendering → maintenance → inspection and acceptance.
1. basement treatment: clean up the garbage in the basement and water it before pouring concrete.
2. Find the elevation: according to the horizontal standard line and design thickness, pop up the elevation control line of the upper surface layer on the surrounding walls and columns.
3. Concrete mixing: The mixture ratio of concrete should be determined by experiments according to the design requirements. Feeding must be strictly weighed and the ratio must be accurately controlled. The feeding order of each board is cement → sand → foaming agent → water.
4, according to the provisions, design test block.
5. Laying: Before laying, the base should be wetted, and a layer of plain cement slurry or interface binder should be brushed on the base, and the evenly mixed concrete should be laid back from the room. The low-lying areas should be filled with concrete when vibrating or rolling.
6. Leveling and calendering: After the surface of the grey surface absorbs water, rub it flat with a wood trowel.
First plastering: gently plastering with an iron trowel until the pulp is produced;
Plastering for the second time: after the initial setting of the surface mortar, fill the pits and sand holes with an iron trowel, and be careful not to leak pressure;
Plastering for the third time: before the final setting of the surface mortar, use an iron trowel to plaster hard, and smooth all plastering lines to make the surface of the surface layer dense and flat.
7. Maintenance: After the construction is completed, it should be covered with water for maintenance about 24 hours, at least twice a day, and people are forbidden. The maintenance period should not be less than 7 days.
Xiaobian on foam concrete will introduce this aspect to you, and our website "Tuba Rabbit Decoration Network" will bring more practical knowledge.
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