Question 1: What are the raw materials of lightweight concrete? There are many customized materials for lightweight concrete, depending on the performance requirements of lightweight concrete.

If there is no special requirement, it is generally made of ceramsite, sand, cement and water.

Question 2: What kinds of lightweight concrete are there? Who knows that lightweight concrete is concrete with apparent density less than 1950 kg/m3? It can be divided into three categories:

1. lightweight aggregate concrete, its apparent density is 800 ~ 1950kg/m3. Lightweight aggregate includes pumice, volcanic slag, ceramsite, expanded perlite, expanded slag and slag.

2. Porous concrete (foamed concrete, aerated concrete), its apparent density is 300 ~ 1000 kg/m3. Foam concrete is made of cement slurry or cement mortar and stable foam. Aerated concrete is made of cement, water and gas-generating agent.

3. Macroporous concrete (ordinary macroporous concrete and lightweight aggregate macroporous concrete) does not contain fine aggregate. The apparent density range of ordinary macroporous concrete is 1500 ~ 1900 kg/m3, which is made of crushed stone, soft stone and heavy slag. The apparent density of lightweight aggregate macroporous concrete is 500 ~ 1500 kg/m3, which is made of ceramsite, pumice, broken bricks and slag.

Chuang qi qi Dian decoration

Question 3: What's the difference between lightweight concrete and ordinary concrete? Foamed concrete is also called foamed cement and lightweight concrete.

Lightweight concrete (foamed concrete) is a kind of concrete product with considerable strength, which contains a large number of tiny closed cells by introducing air, nitrogen, carbon dioxide, oxygen and other gases into the concrete slurry through chemical or physical means according to the application needs. The manufacture of lightweight concrete (foamed concrete) is usually to mechanically foam the aqueous solution of foaming agent, and then add the foam into the slurry containing siliceous materials, calcareous materials, water and various additives, and after mixing, stirring and casting, a new lightweight thermal insulation material with a large number of closed cells is formed after natural curing.

The applications of foamed concrete in China are mainly cast-in-place foamed concrete insulation layer on the roof, foamed concrete block, foamed concrete lightweight wallboard and foamed concrete compensation foundation.

Advantages: light weight; Good thermal insulation performance; Good sound insulation and fire prevention performance; Overall performance is good; Low elasticity and good shock absorption; Strong waterproof performance; Convenient production and processing; Good environmental protection performance; Convenient construction; Good pumpability, high compressive strength (0.5-22.2Mpa), good impact energy absorption performance, large use of industrial waste residue, low price and so on.

Disadvantages: low strength; High opening rate; Cracking and water absorption: The surface of hardened foamed concrete cracks, resulting in absorbing a lot of external moisture.

common concrete

Ordinary concrete generally refers to the artificial stone made of cement as the main cementing material, when necessary, mixed with water, sand, stone, chemical admixture and mineral admixture, mixed in a proper proportion, evenly stirred, compacted and maintained. 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, that is, hardened concrete or concrete.

In civil engineering, the most widely used is ordinary concrete: cement concrete made of cement as cementing material, sand and gravel as aggregate and mixed with water. Concrete in a broad sense is an artificial stone made of cementitious materials, coarse and fine aggregates, water and other additives in a proper proportion.

Advantages: rich raw materials and low cost; Good plasticity; High strength; Good durability; Can be reinforced with steel bars;

Disadvantages: self-importance; Brittle material;

Question: What's the difference between GRC and lightweight concrete? There is still a big difference between the two. Different concepts have different composition materials, technical performance and application fields.

Firstly, GRC is glass fiber reinforced concrete, so it is glass fiber reinforced cement. It is a fiber cement composite material with alkali-resistant glass fiber as reinforcing material and cement mortar as matrix material. The key is that there is no coarse aggregate (greater than 5mm) in the composition material! !

Generally, it can be used as a decorative component of GRC building details; GRC sculpture; Do more GRC external wall hanging boards, GRC lightweight partition boards, GRC insulation boards, ventilation pipes, permanent tubular core molds, permanent templates, roof components of industrial buildings, etc.

For example, GRC composite wallboard is a new type of composite wall material, which is based on low alkalinity cement mortar, reinforced by alkali-resistant glass fiber, and compounded with other light thermal insulation materials after cast-in-place or prefabrication.

Secondly, lightweight concrete refers to concrete with apparent density less than 1900 ~ 2000 kg/m 3, which can be prepared by using lightweight fine aggregate and lightweight coarse aggregate, adding cement and additives. Broadly speaking, it includes aerated concrete (excluding coarse aggregate), foamed concrete and ceramsite concrete. Generally, light coarse aggregate (such as ceramsite, expanded vermiculite and expanded perlite) is added. ) There is no glass fiber.

In terms of use, it has good heat insulation performance because of its light weight and high porosity. According to the apparent density, it can be used for bearings, diaphragms, shells or insulation. It is mainly used to make lightweight interior partition board, exterior wall board, composite wall board, or internal and external masonry structure.

So it is similar in use, and can be used to make lightweight wallboard.

Question 5: What is the proportion of lightweight aggregate concrete?

The mix design of lightweight aggregate concrete should mainly meet the requirements of compressive strength, density and consistency, and take the principle of rational use of materials and saving cement. When necessary, special requirements for concrete performance (such as elastic modulus, carbonation and frost resistance, etc.) should be met. ).

The mixture ratio of lightweight aggregate concrete should be determined by calculation and trial matching.

Lightweight aggregate in the mixture ratio of lightweight aggregate concrete should adopt the same variety of lightweight aggregate. When lightweight aggregate concrete for structural insulation and its products are mixed with coal (furnace) slag light coarse aggregate, the mixing amount should not be greater than 30% of the total coarse aggregate, and the carbon content of coal (furnace) slag should not be greater than 65438 00%. When another kind of coarse aggregate is added to improve some properties, its reasonable dosage must be determined through experiments.

The strength grade of lightweight aggregate concrete is divided into: LC5.0；; LC7.5LC 10； LC 15； LC20

Lc25LC30LC35LC40LC45LC55LC60 lightweight aggregate concrete is divided into fourteen grades according to its dry apparent density (see table 1).

Question 6: What is lightweight concrete and what is lightweight concrete?

Concrete whose density is less than ordinary concrete is called lightweight concrete.

Lightweight concrete has a low density, and its density grade is generally 300- 1800kg/m3.

Look at the textbook specifically.

Question 7: Is there a difference between lightweight concrete and lightweight aggregate concrete? Specifically, 10 is different. Lightweight concrete is also called foamed concrete (composed of sand, cement, foaming agent and water). Lightweight aggregate concrete is ordinary concrete (usually composed of sand, stone, cement and water).

Question 8: I want to know more about lightweight concrete. Lightweight concrete is the floorboard of concrete whose bulk density is less than half that of ordinary concrete, and its composition is an artificial building material block with aggregate and cement as gel.

1, the earliest lightweight concrete is aggregate-free. The cement slurry is foamed with foaming agent to form foams with large and small diameters. After hardening, the cement becomes a fixed body and is sawed into blocks. Its bulk density is 600 ~ 1200 k/m3. The compressive strength is about 3.0Mpa, which has good thermal insulation and sound insulation performance, and is not resistant to moisture and water. It can be used as a non-pressure partition wall and insulation layer. At that time, the foaming agents were rosin saponification agent, leather waste liquid, pig blood caustic soda and so on. It is difficult to control the volume shrinkage during hardening.

2. Modern lightweight concrete is autoclaved fly ash block, which is made of fly ash as gel and superfine quartz powder as aggregate, foamed to form small-diameter foam, autoclaved and sawed into blocks. The bulk density is 550 ~ 1000 k/m3. The compressive strength is about 2.5~5.0Mpa, which has good thermal insulation and sound insulation performance and is not resistant to moisture and water. It can be used as non-pressure filled wall, partition wall and insulation layer.

3. There is also a kind of ceramsite concrete, which is made of cement, ceramsite and pottery sand. It has certain thermal insulation and sound insulation performance and certain compressive strength, and can be used to build a one-story or two-story house. Authentic ceramsite concrete blocks are more expensive.

4. The bulk density of cast-in-place ceramsite concrete is 1500 ~ 1800 k/m3, and the compressive strength is 25Mpa. Some small high-rise reinforced concrete houses have been built in major cities on a trial basis due to the reduction of structural weight.

I am engaged in technical work, and the market price fluctuates, so it is inconvenient to comment. Excuse me!

Question 9: What are the characteristics and uses of lightweight concrete? 1. The characteristics of lightweight concrete are as follows:

1. The main features of lightweight concrete include: low apparent density, good thermal insulation, good fire resistance, good mechanical properties and easy processing. And has good deformability, low elastic modulus and large shrinkage and creep in general.

2. Light weight: The bulk density of ordinary concrete is 2400kg/ m3, while that of load-bearing lightweight concrete is generally 1600- 1900kg/ m3.

3. Good thermal insulation performance: the thermal conductivity of ordinary concrete is 1.22- 1.45 w/m * k) in dry state, but it can reach 1.62- 1.74 w/(m * l) in wet state, which is light.

4. Small fire resistance: This is mainly due to the low thermal conductivity and good heat resistance of lightweight concrete. The former can delay the temperature rise of the structure, and the latter can reduce the strength reduction of concrete after heating.

5. Good sound insulation performance: This is mainly due to the large porosity of lightweight concrete, so its sound insulation effect is better than that of ordinary concrete.

Second, the use of lightweight concrete is as follows:

1, lightweight concrete is mainly used for non-bearing walls and thermal insulation materials. Lightweight concrete can also be used in load-bearing structures to reduce its own weight.

2. Lightweight aggregate concrete is applied to industrial and civil buildings and other projects, saving material consumption, improving the efficiency of component transportation and hoisting, reducing foundation load and improving building functions.

3. According to its different uses in construction engineering, lightweight aggregate concrete can be divided into thermal insulation lightweight aggregate concrete, structural thermal insulation lightweight aggregate concrete and structural lightweight aggregate concrete. In addition, lightweight concrete can also be used as heat-resistant concrete instead of kiln lining.

Lightweight concrete is one of the main types of concrete, and it is also the most used one among all kinds of concrete. Knowing the characteristics and uses of some lightweight concrete can help you choose and use it correctly and reasonably in daily use such as building construction and even home decoration.

Question 10: What kinds of concrete are there? According to cementitious materials, what kinds of concrete are there?

(1) inorganic cementitious material concrete, such as cement concrete, gypsum concrete, silicate concrete, sodium silicate concrete, etc. ;

② Organic binder concrete, such as asphalt concrete and polymer concrete.

Concrete is classified according to apparent density.

Concrete can be divided into heavy concrete, ordinary concrete and light concrete according to its apparent density. The difference between these three kinds of concrete is the difference of aggregate.

The apparent density of heavy concrete is more than 2500 kg/m3; Made of particularly dense and heavy aggregate. Such as barite concrete and steel chip concrete. , not affected by x-rays and gamma rays.

Ordinary concrete is commonly used in Yuanbao building, and its apparent density is 1950 ~ 2500 kg/m3. Aggregates are sand and stones.

The apparent density of light concrete is less than1950kg/m3; Concrete. It can be divided into three categories:

1. lightweight aggregate concrete, its apparent density is 800 ~1950kg/m3; , lightweight aggregate including pumice, volcanic slag, ceramsite, expanded perlite, expanded slag, slag, etc.

2. Porous concrete (foamed concrete, aerated concrete), its apparent density is 300 ~1000 kg/m3; . Foam concrete is made of cement slurry or cement mortar and stable foam. Aerated concrete is made of cement, water and gas-generating agent.

3. Macroporous concrete (ordinary macroporous concrete and lightweight aggregate macroporous concrete) does not contain fine aggregate. The apparent density range of ordinary macroporous concrete is1500 ~1900 kg/m3; , is made of crushed stone, soft stone and heavy slag as aggregate. The apparent density of lightweight aggregate macroporous concrete is 500 ~1500 kg/m3; , is made of ceramsite, pumice, brick and slag as aggregate.

According to the use function classification mainly include

Structural concrete, thermal insulation concrete, decorative concrete, waterproof concrete, refractory concrete, hydraulic concrete, marine concrete, road concrete, radiation-proof concrete, etc.

According to the construction technology classification mainly include

Centrifugal concrete, vacuum concrete, grouting concrete, shotcrete, roller compacted concrete, extruded concrete, pumping concrete, etc. According to the reinforcement methods, there are plain concrete, reinforced concrete, steel wire mesh cement, fiber concrete and prestressed concrete.

According to the workability of concrete mixture classification

Hard concrete, semi-hard concrete, plastic concrete, flowing concrete, high fluidity concrete, flowing concrete, etc.