What is a concrete block? What are the common concrete blocks?

Concrete blocks are solid.

In general, concrete has good durability. However, in cold areas, especially in engineering sites where water levels change and when subjected to frequent freeze-thaw alternation in a saturated state, concrete is prone to damage.

For this reason, there are certain frost resistance requirements for concrete. When used in impervious projects, concrete is required to have good impermeability and corrosion resistance, and impermeability, frost resistance, and erosion resistance are concrete durability.

Prevention and control measures for concrete blocks:

In order to reduce the adverse effects of temperature stress caused by temperature difference on the upper wall, it is recommended to set reinforced concrete along the inner and outer walls and gables at the window sill of the opening at both ends of the building.

wall strip or reinforced wall strip. Control cracks in the top wall.

The key is to reduce the temperature difference between the roof and the wall. Therefore, the insulation layer and the thermal insulation layer must be used at the same time, and the thickness of the insulation layer at the cornice must meet the requirements of the allowable temperature difference.

At the same time, the insulation layer should be fully paved, and there should be no gaps at the cornice. Dividing joints should be set at appropriate parts of the roof. Reinforced concrete is provided at the window sill on each floor.

window sill beams to reduce cracks due to pressure differences.

Concrete blocks are blocks made of cement, river sand or stone, fly ash and other materials to replace traditional bricks. Concrete blocks can be both solid and hollow, and there are many specifications. It can be slightly lower or higher than that of traditional red bricks, depending on the mix of raw materials used, local raw materials, labor costs and uses.

Solid concrete blocks, like solid red bricks, will gradually be eliminated by high-rise buildings, and are currently mainly used for low-rise buildings. Concrete blocks with higher grades are no less strong than wall structures formed by red bricks. The biggest disadvantage of the masonry structure wall is that the seismic ability is poor, and it is prone to cracking and collapse.

The blocks are represented by slashes in the drawings, the concrete is represented by "point + triangle" in the drawing, and the reinforced concrete is represented by "slash + point + triangle" in the drawing. As long as it is a masonry structure, no matter what kind of material the block is used, it is indicated by a diagonal line, and it should be stated in the drawing: the wall is built with a certain material of a certain specification.

The waterproof concrete wall is a reinforced concrete wall, in the drawing, the proportion of small directly filled, the proportion of the large point should be expressed by "oblique line + point + triangle", the limit of the size of this ratio is generally 1:50, such as, 1:50 below :

200 or something like that, just fill it up: 20 or 1:10, it should be represented by "slash + point + triangle".

When the temperature of aerated concrete is below 600, its compressive strength increases slightly, and when the temperature is about 600, its compressive strength is close to the compressive strength at room temperature, so the fire performance of aerated concrete as a building material reaches the national first-class fire protection standard.

Reading guide: Nowadays, with the improvement of people's living standards, the technology of building buildings is also improving, and concrete blocks have now become the main building materials products, which not only improve the quality of the building effect but also greatly improve the efficiency of building buildings. So for the most important building materials around you, do you know what are the concrete blocks?

The following will take you to understand the varieties and introductions of the most common concrete blocks on the market!

1. Ordinary concrete small hollow blocksOrdinary concrete small hollow block, also known as concrete block, its main material is made of cement, sand and gravel, this concrete block is often used in the construction of high-rise buildings or bridges, fences, flower beds, etc., and is used in high-rise buildings because the material of small concrete block can resist the magnitude of 8 and below. Of course, the specifications for the production of this material are also very high, and the specification size is usually required to be 390mm 190mm 190mm, and the hollow heart rate is not allowed to be less than 25%.

2. Light aggregate concrete small hollow blocksCavity light aggregate concrete small hollow block is mainly made of cement, slag, ceramsite, pumice, etc., because its materials include slag, pumice, ceramsite and other materials, so it has a certain water absorption and frost resistance. The specifications and sizes of light aggregate concrete small hollow blocks and ordinary concrete small hollow blocks are the same. However, the minimum load-bearing outer wall thickness should not be less than 30mm, and the rib thickness should not be less than 25mm; The minimum outer wall thickness and rib thickness of the non-load-bearing block shall not be less than 20mm.

3. Autoclaved aerated concrete blocksThe main raw materials of autoclaved aerated concrete blocks are cement, lime, pulverized coal, slag, aluminum powder, etc., according to the characteristics of raw materials, autoclaved aerated concrete blocks can have the functions of fire resistance, heat preservation, sound insulation, etc., and their own strength is also higher. There are many specifications and sizes of autoclaved aerated concrete blocks, and the most common ones are mainly divided into length: 600mm; Width:

75mm、100mm、125mm、150mm、175mm、200mm、200mm、250mm、60mm、120mm、180mm、240mm；Height: 200mm, 240mm, 250mm, 300mm, etc.

Fourth, foam concrete blocksFoam concrete block is a new type of lightweight insulation material, also known as foamed concrete, which is made of coal ash, sand, stone powder, calcium carbide powder, etc. Foam concrete block has the characteristics of water and moisture resistance, sound and heat insulation, high strength, etc., and this concrete is a first-class energy-saving product.

So much has been introduced to you, do you have a specific understanding of concrete blocks? In fact, no matter which concrete material has its advantages and disadvantages, so you need to choose each one carefully. Of course, Tuba Rabbit will continue to introduce you to more knowledge you want to know, please continue to pay attention to Tuba Rabbit**!

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<> four types: ordinary concrete small hollow block, light aggregate concrete small hollow block, autoclaved aerated concrete block, and foam concrete block. Ordinary concrete small hollow blocks are mainly used in high-rise buildings or bridges, because the concrete blocks of this material can withstand grade 8**. Light aggregate concrete small hollow blocks are very absorbent and very frost resistant.

Autoclaved aerated concrete blocks are mainly used in factory construction, so this kind of concrete blocks have the functions of heat preservation and heat resistance. Foam concrete blocks are mainly used for sound insulation because of their own very high strength.

1. The bulk density is different.

The bulk density grade of concrete aerated block B05 is 500, and the bulk density grade of concrete aerated block B06 is 600.

2. The quality is different.

B05 requires the bulk density of the block per cubic meter to be less than 525 kg (qualified product) or less than 500 kg (excellent product) B05 block has two strength grades, which are excellent products, qualified products, and excellent products of B05 level blocks.

B06 requires the bulk density of blocks per cubic meter to be less than 625 kg (qualified products) or less than 600 kg (excellent products), which is a qualified product of B06 level blocks.

1. The aerated block is hollow inside, and the bulk density is much smaller, which is generally used as a filling wall, and the self-weight load of the object is relatively small, which is conducive to the fiber structure of the cover. Ordinary concrete blocks have a slightly larger bulk density and are generally used in load-bearing walls.

2. The process is also very different, the aerated concrete block is formed by the chemical reaction of raw materials crushing, ball milling, metering, pulping, mixing, pouring, resting, cutting, steaming, and raw materials through high temperature and high pressure. Concrete blocks can be understood as cement concrete blocks, and in popular terms, cement bricks, this kind of masonry is formed by vibration. The thermal insulation and thermal insulation effect of aerated concrete blocks are higher than those of concrete blocks.

Answers]: a, b, c, d

This question examines masonry materials. The concrete block is made of cement or clinker-free cement as the adhesive, with sand, stone or light aggregate (floating high laughing stone, ceramsite, etc.), and the air is mixed by agitation, molding and curing.