What factors affect the strength of aerated concrete blocks

The benefits and advantages of aerated concrete blocks are as follows: 1. The general weight of light weight aerated concrete blocks is 500-700 kilograms of cubic meters, which is only equivalent to 1 4-1 3 of clay bricks and lime sand bricks, and 1 5 of ordinary concrete, which is a lighter kind of concrete, suitable for the infill wall of high-rise buildings and the load-bearing wall of low-rise buildings. Using this material, the dead weight of the whole building can be reduced by more than 40% compared with that of ordinary brick-concrete buildings.

Due to the reduction of the weight of the building, the destructive power is small, so the seismic resistance of the building is greatly improved. The thermal conductivity of thermal insulation aerated concrete is generally only 1 4-1 5 of granular earth bricks and lime sand bricks, (the thermal conductivity of granular soil bricks is; The thermal conductivity of sand-lime brick is about 1 6 of ordinary concrete. Practice has proven that:

The thermal insulation effect of a 20 cm thick aerated concrete wall is equivalent to that of a 49 cm thick clay brick wall, and the thermal insulation performance is also much better than that of a 24 cm brick wall. In this way, the thickness of the wall is greatly thinned, and the effective usable area of the building is expanded accordingly, the thickness of the building material is saved, the construction efficiency is improved, the project cost is reduced, and the self-weight of the building is reduced. 2. High strengthAfter experiments, the compressive strength of aerated concrete blocks is greater than 25 kg square centimeters, which is equivalent to the compressive strength of No. 125 clay bricks and lime sand bricks.

3. Seismic resistance in Fengnan, Tangshan and other places with a magnitude of magnitude, according to the post-earthquake investigation, only a few new cracks appeared in aerated concrete buildings, and almost all of the brick-concrete buildings collapsed, so that the two buildings that are not far apart, with the same structure and different materials, form a sharp contrast. According to the analysis, this is because the aerated concrete has a light bulk density, good overall performance, and small inertia force, so it has a certain seismic capacity. This will be of great benefit to our country.

Processable aerated concrete has very good processing properties. Can saw, plan, nail, mill, drill. And it can be reinforcing during the manufacturing process.

It has brought great convenience and flexibility to the construction. When the temperature is below 600, the compressive strength of high-temperature aerated concrete 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. 4. Sound insulation can be seen from the pore structure of aerated concrete, because the internal structure of aerated concrete is like bread, and a large number of closed pores are evenly distributed, so it has the sound absorption performance that general building materials do not have.

5. Mechanization As far as the current situation is concerned, the prefabricated aerated concrete assembly slab can save the finished product stacking site; Save masonry labor; Reduced wet work; The on-site construction progress was accelerated and the construction efficiency was improved. 6. Adaptability can be tailored according to different local raw materials and different conditions. The raw materials can be selected from river sand, fly ash, mineral sand, etc., according to local conditions.

And it can be used as waste, which is conducive to environmental protection and truly turns waste into treasure.

The scope of this problem is too wide, and there are dozens of factors that affect the strength of the autoclaved aerated concrete technician tutorial, some of which have a larger impact and some of which are small, which cannot be solved in a few words.

Strength The average value is not less than The minimum value of a single block is not less than [cubic compressive strength (MPa)] aerated concrete block is a new type of building material that is lightweight and porous, thermal insulation, good fire performance, nailable, sawable, planable and has a certain seismic capacity. As early as the early thirties, China began to produce this product, and is widely used in Shanghai International Hotel, Shanghai Building, Fuzhou Building, People's Bank of China Building and other high-rise buildings. It is an excellent new building material.

Aerated concrete block masonry is generally used in infill walls, and the strength grade of the blocks used is generally partition walls and exterior walls A5. The strength of the mortar is not less than m5.

At present, the strength level of the products used in the domestic market:

Is it autoclaved? If it's graded and graded.

Answer]: a, b, d

Aerated concrete blocks have good thermal insulation performance, and can be used as walls to reduce the energy consumption of buildings for heating and cooling. The apparent density of aerated concrete blocks is small, generally 1 3 of clay bricks, which can reduce the weight of the structure and is conducive to improving the seismic resistance of land buildings. In addition, the aerated concrete block has a smooth surface and accurate size, and it is easy to improve the flatness of the wall acceptance finger surface.

In particular, it is like wood, which can be sawed, planed, drilled, and drilled with nails, and the construction is convenient and fast. However, due to its slow water absorption and moisture conduction, it leads to large dry shrinkage, easy cracking, low strength, and easy pulverization of the surface, so special measures need to be taken. (Note:.)

This knowledge point has been deleted in the new textbook of the fourth edition).

Answer]: a, b, d

Advantages of aerated concrete blocks: Good thermal insulation performance, used as a wall can reduce the energy consumption of building width, heating, cooling and other use; Its apparent density is small and chaotic, generally 1 3 of clay bricks, which can reduce the weight of the structure and improve the seismic capacity of the building; The surface is flat, the size is accurate, and it is easy to improve the flatness of the wall; It can be sawed, planed, drilled and nailed, and the construction is convenient and fast; Disadvantages: Due to its slow water absorption and temperature conduction, it leads to shrinkage and large branches, easy to crack, and low strength, and the surface is easy to pulverize.

Therefore, the correct choice for this question should be "a, b, d".

Summary. Hello, dear. The disadvantages of aerated concrete block development are as follows:

The disadvantage is that the aerated concrete masonry is limited by its own material, and the construction requirements are relatively high, such as the construction is not careful, and it is easy to appear ash cracking, cracking of the plastering layer, hollowing, leakage, etc., especially when used in the exterior wall, if the construction is not careful, it is easy to cause cracking and leakage of the external wall; Quality problems such as cracking, hollowing, and leakage have become bottlenecks restricting the further promotion and application of aerated concrete.

Hello, dear. The disadvantages of aerated concrete block development are as follows: the disadvantage is that the aerated grip beam concrete masonry has relatively high construction requirements due to its own material limitations, such as the construction is not paid attention to the cracking of ash joints, the cracking of the ash transport layer of the plastering section, hollowing, leakage, etc., especially when used in the exterior wall, if the construction does not pay attention to the cracking and leakage of the external wall; Quality problems such as cracking, hollowing, and leakage have become bottlenecks restricting the further promotion and application of aerated concrete.

Extended state return data: aerated concrete blocks. The production process is highly polluting and needs to be built in a relatively remote area.

Its strength increases with the increase of bulk density, and if high strength is required, it is necessary to increase its bulk density to increase the bearing capacity of the foundation and structure. After decoration, there are many common quality problems, and it is very difficult to deal with the closure, such as the interface treatment before plastering is difficult to ensure that it is not hollow, and it is difficult to control the cracks in the handover with other structures.

What is AAC? Is it a new type of concrete? In fact, aerated concrete is a kind of gassing additive, in the process of forming concrete, because there is gas coming out to the outside, so that the concrete block becomes very uniform, and because of the gas overflow, the surface of such a concrete block has many fine pores, so it is called aerated concrete.

This kind of concrete is very uniform because of the gas, and this structure makes the internal structure very strong, so it is used to build houses in some earthquake-prone areas.

Aerated concrete is a kind of raw materials that use siliceous materials, such as sand and fly ash, and then add lime, cement, etc., and add a gassing agent to the raw materials, and then form aerated concrete through the process of mixing, pouring, autoclaving, etc. In the process of autoclaving, a large amount of gas is spilled out, similar to the principle of baking slag bread, thus forming such a porous, but very strong concrete.

Classification of aerated concrete

Aerated concrete can be classified according to shape, raw materials, use, and so on. If it is divided according to the shape, it can be divided into various specifications of aerated concrete blocks, or plate types; According to the raw materials, it is divided into cement, slag, fly ash aerated bricks; If it is divided according to the purpose of use, it can be divided into wall panels and roof panels, non-load-bearing blocks, insulation blocks, and load-bearing blocks.

Advantages of aerated concrete blocks

First of all, it is the advantage of light weight, the concrete block of the same size, due to the reason that the aerated concrete block has pores, its density is greatly reduced, so that the quality of this concrete block becomes very light, but in the structure of the concrete, it does not become very fragile because the quality becomes light, on the contrary, the structure is very uniform, the force is more uniform, and it becomes stronger, which is another advantage of it.

In addition, because this concrete block is porous, there are some other advantages, such as having a certain thermal insulation effect, having a certain sound insulation effect, and this concrete block can be produced by using some waste materials, which has a certain environmental protection.

Specifications of aerated concrete blocks

There are not many types of specifications of aerated concrete blocks, basically there are such a few, the length is uniform 600mm, and the width is mm, and the height can be divided into mm. In actual use, it should be determined according to the needs and the size of the wall, and you can contact the manufacturer to determine the actual specifications.

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Summary. Hello dear! The mortar strength of the masonry aerated block is determined according to the specific situation, which is mainly affected by the following factors:

1.Mortar mix ratio: Mortar mix ratio refers to the ratio of cement, sand and water.

Different mix ratios will have different effects on the strength of the mortar. 2.The production process of mortar:

The production process of mortar includes factors such as mixing time, mixing method, and stirring speed. Different manufacturing processes will affect the strength of the mortar. 3.

Types of sand: Different types of sand have different effects on the strength of the mortar. 4.

Varieties of cement: The variety of cement will also affect the strength of the mortar, and the common ones are ordinary hard grinding cement and high-performance concrete cement. To sum up, the mortar strength of the masonry aerated block is affected by a variety of factors, and the specific strength needs to be tested according to the actual situation.

Generally speaking, the strength of mortar is required to be more than 5MPa in compressive strength and above in tensile strength.

Hello dear! The mortar strength of the masonry aerated block is determined according to the specific situation, which is mainly affected by the following factors:1

Mortar mix ratio: Mortar mix ratio refers to the ratio of cement, sand and water. Different mix ratios will have different effects on the strength of the mortar.

2.Mortar production process: The mortar production process includes factors such as mixing time, mixing method, and stirring speed.

Different manufacturing processes will affect the strength of the mortar. 3.Types of sand:

Different types of sand have different effects on the strength of the mortar. 4.Varieties of cement:

The variety of cement will also affect the strength of the mortar, and the common ones are ordinary hard ground cement and high-performance concrete cement. To sum up, the mortar strength of the masonry aerated block is affected by a variety of factors, and the specific strength needs to be tested according to the actual situation. Generally speaking, the strength of the mortar is required to be more than 5MPa in compressive strength and above tensile strength.

Interior and exterior wall plastering generally how much compressive strength.

The compressive strength of interior and exterior wall plastering is determined according to the type of plastering material, thickness, cover sailing process and other factors, generally speaking, the compressive strength of interior and exterior wall plastering should reach 5MPa to the lack of hail. In actual construction, the compressive strength of the plastering material will be different depending on the type and thickness of the beam. If you need exact compressive strength data, you can consult the building material manufacturer or technician, who can provide more detailed information on a case-by-case basis.