Reinforced concrete density, how much concrete is dense

The apparent density of concrete is the "mass per unit volume" of the concrete mixture after tamping, measured in kg m 3. The main points of the method are as follows:

Instrument: (1) 5L volumetric cylinder;

2) 50kg bench scale;

3) concrete vibrating table;

4) Tamper 16 650mm.

Method: When the slump is greater than 70mm, it is advisable to use a tamper, and when the slump is less than 70mm, it is advisable to use a vibrating table.

When using a tamper to pound in real time, the number of layering and tamping should be determined according to the size of the capacity cylinder: when using a 5L capacity cylinder, the concrete mixture should be loaded in two layers, and the number of insertions and pounding of each layer should be 25 times; When using a capacity cylinder greater than 5L, the height of each layer of concrete should not be greater than 100mm, and the number of insertions per layer should be calculated as not less than 12 times per 10000 mm 2 cross-section. Each insertion should be evenly inserted from the edge to the center, the tamper should run through the entire depth when inserting the bottom layer, and the tamper should penetrate the surface of this layer to the next layer when inserting the second layer; After each layer is pounded, gently beat 5-10 times along the outer wall of the container with a rubber hammer to beat until the punching hole on the surface of the mixture disappears and there are no large bubbles.

When the vibrating table is used, the concrete mixture should be poured into the high capacity cylinder mouth at one time. When loading, you can use a tamper to insert a little pounding, if the concrete is lower than the cylinder mouth during the vibration process, concrete should be added at any time, and the vibration will be until the surface is slurry. Use a scraper to scrape off the excess concrete mixture at the mouth of the cylinder, and fill it if there is a depression on the surface; Wipe the outer wall of the volumetric cylinder and weigh out the total mass of the concrete sample and the volumetric cylinder, accurate to 50g.

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Generally, the density of ordinary concrete is: 2500kg-2700kg cubic meters.

What is the building structure in the code GB 50009-2001 in Article 52 stipulates that the self-weight of reinforced concrete is 24 25kn m3, about 2551kg m3

The 04 version of the specification stipulates that 26kn cubic meters are taken.

Reinforced concrete is about 2551kg m.

The amount of stress bars in reinforced concrete is usually very small, ranging from 1% (mostly in beams and slabs) to 6% (mostly in columns) of the cross-sectional area of the component. The cross-section of the reinforcement is round. In the United States, from 1 to 1 foot, each level increases by 1 8 feet; In Europe from 8 to 30 mm, in 2 mm increments per level; In Chinese mainland from 3 to 40 mm, a total of 19 and so on.

In the United States, according to the carbon content of steel bars, it is divided into 40 steel and 60 steel. The latter has a higher carbon content and higher strength and stiffness, but is difficult to bend. In corrosive environments, electroplating, epoxy-coated rebars, and stainless steel are also used.

In wet and cold climates, epoxy rebar or other composite concrete should be used for structures such as reinforced concrete pavements, bridges, parking lots, etc., which may use de-icing salt, and epoxy rebar can be easily identified by the light green paint on the surface.

Concrete action

In concrete, sand and stone play the role of skeleton and are called aggregates; Cement forms a cement slurry with water, which wraps around the surface of the aggregate and fills its voids. Before hardening, the cement slurry plays a lubricating role, giving the mixture a certain workability and facilitating construction. After the cement slurry hardens, the aggregate is cemented into a solid whole.

The bulk density of C10 to C20 grade concrete is between 2360-2400kg m3, C25-C35 is generally about 2400-2420kg m3, and C35-C40 is generally between 2420-2440kg m3.

Concrete is made of cementitious materials cement, sand, gravel and water, and admixtures and admixtures in a certain proportion. After solidification, it is as hard as stone, and has good compression ability, but poor tensile ability, and is easy to break due to tension. In order to solve this contradiction and give full play to the compressive capacity of concrete, a certain number of steel bars are often added in the concrete tension area or the corresponding part, so that the two materials are bonded into a whole and bear external force together.

Reinforced concrete structures refer to structures made of concrete reinforced with steel bars. The main load-bearing elements are built with reinforced concrete. It includes thin shell structures, cast-in-situ structures of large formwork, and reinforced concrete structures constructed using sliding formwork, rising plates, etc.

A structure made of steel and concrete.

The advantages of reinforced concrete structure are that it can be made of local materials, easy to build, particularly good durability, fire resistance, good moldability, strong solidity and long service life. The disadvantage of reinforced concrete structure is that the weight is large, because it is the combination of steel bar and concrete, the tensile strength of concrete is low, it is easy to break, it is time-consuming, labor-intensive, the production cycle is long, and the construction is affected by the season. It is not suitable in winter, and it is more difficult to reinforce and repair.

The density of the reinforcement is: The minimum standard for the density of building reinforcement is grams of cubic centimeters tons of cubic meters of cubic meters (kilograms) cubic decimeters.

The unit of measurement for calculating the theoretical weight of steel is kilograms (kg).

The density of ordinary carbon steel is gram cubic centimeters, and the steel grade is slightly different, such as manganese steel.

Cement concrete density:

Density is the mass of a substance per unit volume. In general, we think of matter as continuous and without gaps. Therefore, the density is equal to the ratio between its mass and its volume, which is the density of the material.

However, in disciplines such as chemical engineering, the objects we study are small particles, which are stacked together and create voids due to irregularities in shape. In this case, the density obtained by dividing the mass of the pile of materials by the volume of its appearance is not the same as the density of the material itself, and this density is called the expressive density. The ratio of the sum of the void volume to the appearance volume is called porosity.

Porosity is a very important parameter. The expressive density of concrete is 2600.

Generally speaking, the bulk density of C10 to C20 grade concrete is between 2360-2400kg m, and C25-C35 is generally about 2400-2420kg m. C35-C40 is generally between about 2420-2440kg m.

1. Classification according to dry apparent density.

1 heavy concrete.

Heavy concrete refers to concrete with a dry apparent density greater than 2800kg m, which is made of aggregates with a particularly high density (such as barite, iron ore, steel chips, etc.), which has the performance of anti-X-ray and R-ray, so it is also known as anti-radiation concrete, which is widely used in shielding structures in the nuclear industry.

2 Ordinary concrete.

Ordinary concrete refers to the concrete with a dry apparent density of 2000 2800kg m, with cement as the cementitious material, and natural ordinary sand and stone as coarse and fine aggregates. Ordinary concrete is the most widely used and largest amount of concrete in construction projects, and is mainly used as a load-bearing structural material for various buildings.

3 Light concrete.

Light concrete refers to concrete with a dry apparent density of less than 2000kg m3. According to the composition of the material, it can be divided into three categories: light aggregate concrete, porous concrete, macroporous concrete, and can be divided into three types according to the use: structural use, thermal insulation and structural thermal insulation use.

2. Classification according to apparent density.

1.Heavy concrete. Concrete with an apparent density greater than 2600kg m. It is often formulated from barite and iron ore.

2.Ordinary concrete. Cement concrete with an apparent density of 1950 2500kg m. It is mainly formulated with sand, gravel and cement, and is the most commonly used type of concrete in civil engineering.

3.Light concrete. Concrete with an apparent density of less than 1950kg m. Including lightweight aggregate concrete, porous concrete and macroporous concrete, etc.

Specifically, depending on the design of the mix ratio, it is basically within 2350 2450, and the specific assumption in the mix specification is the requirement of 2350 2450.

Concrete without reinforcement, the standard bulk density is 2400kg m.

Theoretical calculations generally choose 2400 kg cubic meters, but in practice and the apparent density, sand rate, gas content of the aggregate is related. It is usually calculated using the volume method, and the actual density is finally known.

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28. If you are a technician on the construction site, you should keep these things in mind and open your mouth to come. There are also various grades of concrete and mortar ratio.

Rebar diameter * Rebar diameter * Example: 16 * 16 * 16 rebar is kilograms per meter.

The density of reinforced concrete is 2551 kg meters. The density of reinforced concrete is proportional to the amount of cement, the density of general C10 and C20 cement is about 2360 2400 kg cubic meters, the concrete density of C25 C35 is about 2400 2420 kg cubic meters, and the density of C35 C40 grade concrete is about 2420 2440 kg cubic meters. Concrete is a general term for composite materials obtained by mixing gel materials, aggregates and water in a certain proportion and hardening over a period of time.

Reinforced concrete is a composite material that adds reinforced mesh, steel plate, fiber, etc. to concrete, among which reinforced concrete is the most widely used one at present, and its linear expansion coefficient is basically the same as that of concrete, and will not cause excessive stress due to environmental differences.

Reinforced concrete is a kind of structure dominated by reinforced concrete, which includes a thin shell structure, a large formwork cast-in-place structure and a reinforced concrete structure with sliding formwork and rising plate structure.

Advantages: It is easier to build, and the materials are also easy to find and can be bought in the local market. It can be used for a long time, absolutely no problem for sixty or seventy years, and it can also be fireproof. As long as it is built, it is very easy to build, basically quick and not wrong, and it is very strong.

Defects: Due to the weight of these two materials, the workers had to spend a lot of effort during the construction process. If the soil is not strong, it is likely to break. It takes more time. Once something goes wrong, it's hard to fix.

Applicable performance. Under normal circumstances, this thing can be used, but if there is a little deformation, or crack, it cannot affect its normal use, otherwise, there will be a great danger.

Staying power. Moreover, there is a limit to this time, generally sixty or seventy years, and if it does not meet this standard, it is not eligible.

There are many things to pay attention to when building such a house, so it is best to hire a professional construction team.

The above is a detailed interpretation of the two issues of reinforced concrete density and the advantages and disadvantages of reinforced concrete structure, in summary, the density of reinforced concrete is 2551 kilogram meters.