What is Lightweight Concrete? What is the difference between lightweight concrete and all light conc

Lightweight concrete.

Also known as foam concrete.

The blowing agent is applied through the foaming system of the foaming machine.

It is fully foamed by mechanical means, and the foam is evenly mixed with the cement slurry, and then the cast-in-place construction or mold forming is carried out through the pumping system of the foaming machine, and a new type of lightweight thermal insulation material containing a large number of closed pores is formed by natural curing. It belongs to bubble-like thermal insulation materials, and the outstanding feature is to form closed foam pores inside the concrete, so that the concrete is lightweight and insulated; At the same time, it is also aerated concrete.

It is a special variety, its pore structure and material properties are close to aerated concrete, the difference between the two is only in the shape of the pore and the difference between the means of aeration. The pores of aerated concrete are generally oval, while foam concrete is affected by the action of capillaries, resulting in deformation and the formation of polyhedra.

Aerated concrete is the use of chemical gas, through chemical reaction, from the internal gas generation and the formation of pores, lightweight concrete is through the method of mechanical foaming, the foaming agent is made into foam, and then the foam is added to cement, magnesite, gypsum slurry to form a foam slurry, and then cured by natural curing steam. Lightweight concrete is a big family of concrete.

In recent years, China and abroad have attached great importance to the research and development of foam concrete, making it more and more widely used in the field of construction. Lightweight concrete is usually a porous material made by mechanical method to prepare foam from aqueous solution of foaming agent, and then add foam to the slurry composed of siliceous materials, calcareous materials, water and various admixtures, etc., and mix and stir, pour molding and curing. Because foam concrete contains a large number of closed pores, it has the following good physical and mechanical properties.

With its good characteristics, lightweight concrete is widely used in energy-saving wall materials, and has also been applied in other aspects. At present, the application of lightweight concrete in China is mainly roof insulation layer cast-in-situ, lightweight wallboard, compensation foundation. However, by making full use of its good characteristics, it can be used as a retaining wall to expand its application field in construction engineering, speed up the progress of the project, improve the quality of the project.

The rock wall was mainly used as a port. The use as a lightweight backfill behind the quay wall reduces the vertical cut-off and also reduces the lateral load on the opposing quay wall. This is because it is a rigid body with good bonding properties, and it does not exert lateral pressure on the shore wall along the perimeter, which reduces settlement and consequently reduces maintenance costs, resulting in significant savings.

Foam concrete can also be used to improve the stability of the embankment slope, replacing part of the soil of the slope with a reduction in the mass, thus reducing the forces that affect the stability of the slope.

There are many raw materials for lightweight concrete, and the specific requirements are based on the performance indicators of lightweight concrete. If there are no special requirements, the most commonly used ones now are generally made of ceramsite, sand, cement and water. Lightweight concrete is a porous material, so it is also a good sound insulation material, which can be used as a sound insulation layer on the floor of buildings, on the sound insulation panels of highways, and on the top floor of underground buildings.

Lightweight concrete is an inorganic material that does not burn, so it has good fire resistance, and when used on buildings, it can improve the fire performance of buildings. The porosity of lightweight concrete gives it a low modulus of elasticity, which gives it good absorption and dispersion of impact loads.

Foam concrete.

It is also known as foamed cement and light concrete.

Wait. Lightweight concrete.

Foam concrete) is made by chemical or physical means to remove air or nitrogen and carbon dioxide according to the needs of the application.

Gas, oxygen and other gases are introduced into the concrete slurry, and after reasonable curing and molding, the concrete products containing a large number of small closed pores and having considerable strength are formed. The production of lightweight concrete (foam concrete) is usually a new type of lightweight thermal insulation material containing a large number of closed pores formed by mechanical method by mechanical method, and then the foam is added to the slurry composed of siliceous materials, calcareous materials, water and various admixtures.

The application of foam concrete in China is mainly cast-in-situ roof foam concrete insulation layer, foam concrete surface block, foam concrete lightweight wall panel, and foam concrete compensation foundation.

Advantages: light weight; Good thermal insulation performance; Good sound insulation and fire resistance; Good overall performance; Good low-elastic shock absorption; Strong waterproof performance; Convenient production and processing; Good environmental performance; Convenient construction; Good pumpability, compressive strength.

High (, good impact energy absorption performance, can make a large use of industrial waste residue, low cost and other advantages.

Disadvantages: low strength; High porosity; Cracking, water absorption: The surface of hardened foam concrete cracks, resulting in the absorption of a large amount of foreign moisture.

Ordinary concrete.

Normal concrete generally refers to cement as the main cementitious material.

It is an artificial stone made of water, sand and gravel, mixed with chemical admixtures and mineral admixtures if necessary, matched in appropriate proportions, and hardened by uniform stirring, dense molding and curing. Concrete is mainly divided into two stages and states: the plastic state before setting and hardening, that is, fresh concrete or concrete mixture; The hard state after hardening, i.e., hardened concrete or concrete.

in civil engineering.

The most widely used is ordinary concrete: cement concrete made of cement as cementitious material, sand and stone as aggregate, and mixed with water. Generalized concrete is an artificial stone prepared by cementitious materials, coarse and fine aggregates, water and other admixtures in appropriate proportions.

Advantages: abundant raw materials and low cost; Good plasticity; Strength; Good durability; Can be reinforced with reinforcing bar;

The main difference between control concrete and all-light concrete is that the quality per unit volume of their units is different, lightweight concrete is relatively light, and all-light concrete is particularly light.

Is there a difference between mixing soil and cleaning it yourself? Yes, the two of them are different um, the proportion of ingredients is adjusted, so there is a fundamental difference between the two of them, so although they both seem to be laborious, their functions are not the same.

Light aggregate concrete raw materials have coarse aggregates divided into natural aggregates, including pumice, volcanic, porous tuff. Industrial waste includes slag, broken bricks, and self-igniting coal gangue.

Expanded slag beads, fly ash ceramsite.

Artificial aggregates include expanded perlite, shale ceramsite, and clay ceramsite. Fine aggregates include light sand such as fly ash, rock sand, terracotta sand, and ordinary natural sand.

Wait. The composition of light aggregate concrete is shown in the figure below

The raw materials of lightweight concrete are generally made of light coarse aggregate, light sand or ordinary sand, cementitious materials, admixtures and water to prepare concrete with a surface dry density of no more than 1950kg per cubic meter. Generally, it is commonly used in lightweight aggregate plain concrete structures, reinforced lightweight aggregate concrete structures and prestressed lightweight aggregate concrete structures. The advantages are light weight, small cross-section, and reduced material consumption.

The difference between lightweight cement and ordinary cement is obvious, ** different, the name is different, but each has its own advantages and disadvantages, the following is a brief introduction:

Ordinary cement: It is mainly made by taking cement from the bridge pie, then adding an appropriate amount of water, sand, stone gelling and other materials, and then adding chemical admixtures to stir. Advantages: low cost, abundant materials, long service time.

Disadvantages: It is heavy and brittle material.

Lightweight cement: also known as foam concrete, through chemistry according to the needs of the oxygen and carbon dioxide in the air will be introduced into the concrete, forming closed pores of different sizes, generally using mechanical methods to make foam aqueous solution of foaming agent, adding to water and various admixture materials, forming a large number of new insulation materials that secrete pores.

Advantages: light weight, the function of thermal insulation is very sensitive, and it can also play the role of sound insulation and fire resistance, the construction will be very convenient, the compressive strength is high, and it is very affordable.

Disadvantages: The strength is slightly lower, and it is easy to crack. Lightweight cement, also known as low-density cement, is used for the preparation of low-density cement slurry.

This cement is suitable for oil or gas wells that encounter rock formations such as low pressure, holes, fractures, high permeability, etc. This cement is made by mixing the right amount of lightweight material into the cement.

Lightweight aggregate concrete is also commonly referred to as lightweight concreteThe main components are fly ash and cement, the English abbreviation of lightweight concrete is LC, water, ordinary sand and light coarse Huaiyu aggregate are added during the production, the density of the material per cubic is less than 1500 kg, the strength grade exceeds LC20, both material characteristics and pore structure, are very similar to aerated concrete.

Lead return section, the raw material of lightweight concrete.

The raw materials of lightweight concrete include siliceous materials, calcareous materials, water and various admixtures.

The density of lightweight concrete is small, the density grade is generally 300-1800kg m, the density grade of commonly used foam concrete is 300-1200 kg m, in recent years, the density of 160 kg m of ultra-light foam concrete has also been applied in construction projects.

Due to the small density of lightweight concrete, the use of this material in the building structure such as internal and external walls, layers, floors, columns, etc., can generally reduce the weight of the building by about 25%, and some can reach 30%-40% of the total weight of the structure.

Moreover, for structural components, if foam concrete is used instead of ordinary concrete, the bearing capacity of the component can be improved. Therefore, the use of foam concrete in construction projects has significant economic benefits.

<> lightweight concrete is a bubble-like thermal insulation material, and the prominent special tassel point is to form a foam hole in the concrete to close the peibu, so that the concrete is lightweight and insulated. Among them, what are the types of lightweight concrete? The following is an introduction to the main content of lightweight concrete types brought by Zhongda Consulting for reference.

Lightweight concrete is concrete with an apparent density of less than 1950 kg cubic meters. It can be further divided into three categories:

1 light aggregate concrete, its apparent density in 800 1950 kg cubic meters, light aggregate including pumice, volcanic slag, ceramsite, expanded perlite, expanded slag, slag, etc.

2 Hollow concrete (foam concrete, aerated concrete), the apparent density of which is 300 1000 kg cubic meters. Foam concrete is made from cement slurry or cement mortar with stable foam. Aerated concrete is made of cement, water and gassing agents.

3. Macroporous concrete transport soil (ordinary macroporous concrete, light aggregate macroporous concrete), there is no fine aggregate in its composition. The apparent density of ordinary macroporous concrete ranges from 1500 to 1900 kilograms of cubic meters, and it is prepared with crushed stone, soft stone, and heavy slag as aggregates. The apparent density of light aggregate macroporous concrete is 500 1500 kilograms of cubic meters, which is prepared with ceramsite, pumice, broken bricks, slag, etc. as aggregates.

1. ALC is the abbreviation of autoclaved lightweight concrete, which is a high-performance autoclaved aerated concrete. ALC board is a porous concrete forming board (reinforced with treated steel bar) made of fly ash (or silica sand), cement, lime and other main raw materials through high-pressure steam curing.

2. ALC board can be used as both wall material and roof panel, which is a new building material with superior performance. ALC board first appeared in Europe, while Japan, Europe and other regions have been produced and applied for more than 40 years. At present, the production technology and equipment of domestic manufacturers are mainly imported from Japan and Germany.

3. The sound insulation performance of ALC board is relatively good, and the surface is designed with multiple small holes, and the distribution is relatively uniform. Generally speaking, an ALC board with a thickness of 100 can block noise up to any cavity, while an ALC board with a thickness of 150 can block noise up to.

4. There are three main materials used in ALC board, namely fly ash, lime and cement. ALC board, also known as autoclaved aerated plum shirt concrete, needs to go through a multi-layer process in the production process, so as to create a new high-performance material that can be used as both wall material and roof panel.