Introduction of the maximum particle size that can be passed by

1.

1. The maximum particle size refers to the minimum standard mesh size with 100% mesh passing rate in the mixture

2. The nominal maximum particle size refers to the minimum size of the standard sieve whose particle content retained on the maximum size standard sieve does not exceed 10% (that is, the mesh passing rate in the mixture is 90-100%). It is usually one fraction smaller than the maximum size of aggregate

3. Nominal maximum size of aggregate: refers to the minimum size of the sieve hole of the standard sieve in which the aggregate can pass completely or a small amount can not pass (generally, the allowable sieve resie is not more than 10%). It is usually one fraction smaller than the maximum particle size of aggregate, in mm

4. Maximum size of aggregate: refers to the minimum size of the standard sieve through which 100% of the aggregate is required to pass, in mm

5. Nominal maximum size of aggregate: refers to the minimum size of the sieve hole of the standard sieve in which the aggregate can pass completely or a small amount can not pass (generally, the allowable sieve resie is not more than 10%). It is usually one fraction smaller than the maximum particle size of aggregate, in mm. If both conditions are satisfied, the maximum particle size of aggregate is the same as the nominal maximum particle size. But that's not a lot

6. In our country, the maximum particle size and the nominal particle size are mixed (and not specified). For example, the mineral mixture used in AC --- 13 has a particle size of more than 13. I think "13" here refers to the nominal particle size, but for the coarse aggregate used in asphalt concrete, there is only "15" in the specification, In the design process, "13" is understood as the maximum particle size (the maximum particle size determined according to the structure type, horizon and road grade)

extended data:

the maximum particle size refers to 100% passing the required minimum standard sieve hole, that is, all must pass. The nominal maximum particle size refers to the minimum standard sieve size of not more than 10%

Basic classification of asphalt mixture:

1. According to material composition and structure, it can be divided into continuous graded mixture and discontinuous graded mixture. According to the composition of mineral aggregate gradation and porosity, it can be divided into dense graded mixture, semi open graded mixture and open graded mixture

According to the nominal maximum particle size, it can be divided into extra coarse type (nominal maximum particle size is greater than 31.5mm), coarse type (nominal maximum particle size is equal to or greater than 26.5mm)

2. The maximum particle size is just able to pass through the sieve, which is under the sieve; The minimum particle size is just above the sieve, which can't pass through the sieve. 5-31.5mm, 5-refers to more than 5mm mesh and less than 31.5mm mesh.

3.

1. Maximum size of aggregate: refers to the minimum size of the

standard sieve through which 100% of the aggregate is required to pass, in mm

2. Nominal maximum size of aggregate: refers to the minimum size of the sieve hole of the standard sieve in which the aggregate can pass through

completely or a small amount can not pass through (generally, the allowable sieve resie is not more than 10%). It is usually one fraction smaller than the maximum particle size of aggregate, in mm

If both conditions are satisfied, the maximum particle size and nominal maximum particle size of aggregate are the same. But that's not a lot

that is: the maximum particle size refers to 100% passing through the required minimum standard sieve hole. That is to say, all of them must pass. The nominal maximum particle size refers to the minimum standard sieve size of not more than 10%; It is usually one fraction larger than the maximum particle size

development data

gradation is the proportion of aggregate size particles matching each other. If the aggregate gradation is appropriate, the amount of mortar filling the aggregate voids can be reced, the water consumption per unit volume and the amount of cementitious materials can be reced accordingly, and the mixture is not easy to separate

The

gradation is analyzed by sieves of various sizes, expressed as the weight percentage of particles passing through sieves of various specified sizes

concrete aggregate is an important part of concrete, which plays the role of skeleton and filling in concrete. It is usually divided into fine aggregate and coarse aggregate. In concrete, the size of 0.155-5mm is called fine aggregate; The coarse aggregate with particle size larger than 5mm is called coarse aggregate

4. Reply to the building owner:
it is usually necessary to calculate the passing rate of a kind of material
it is necessary to carry out sample screening and screening test
simply calculate the passing rate of a certain sieve, such as 40 mesh, that is, the passing rate is divided by (total material weight resie) / total material weight, or directly by the weight of the material under the sieve

we usually stack multiple sieves, such as 20 mesh, 40 mesh, 80 mesh, According to the requirements of national pharmacopoeia, we can calculate the passing rate of each particle size

or intercept the specific passing rate and sieve requirements of each particle size distribution

respectively

5.

The maximum nominal particle size of coal is a kind of powder characteristics of coal. It is an experimental work to characterize the particle size characteristics of coal powder by specific instruments and methods

the nominal maximum particle size refers to the corresponding mesh size of the sieve which is closest to (but not greater than) 5% of the cumulative mass percentage of the material on the sieve

take about 600 kg of commercial coal sample, accurate to 0.5 kg, pass through 150 mm, 100 mm, 50 mm, 25 mm round hole sieve to form square hole sieve respectively, weigh out the mass of the material on the sieve, accurate to 0.5 kg, and calculate the mass fraction of the material on the sieve in the whole coal sample. The size of the best sieve hole with the cumulative yield of material on the sieve closest to but not more than 5% is the nominal maximum particle size of commercial coal

extended data:

several key indicators of particle size characteristics

< P > 1, D50: the corresponding particle size when the cumulative particle size distribution percentage of a sample reaches 50%. Its physical meaning is that particles larger than it account for 50%, and particles smaller than it also account for 50%. D50 is also called median size or median size. D50 is often used to represent the average particle size of powder

D97: the corresponding particle size when the cumulative particle size distribution of a sample reaches 97%. Its physical meaning is that 97% of the particles are smaller than it. D97 is often used to express the particle size index of the coarse end of powder

The definition and physical meaning of other parameters such as D16 and D90 are similar to D97

Specific surface area: the sum of the surface areas of particles per unit weight. The unit of specific surface area is m2 / kg or cm2 / g. There is a certain relationship between specific surface area and particle size. The finer the particle size is, the larger the specific surface area is, but this relationship is not necessarily proportional

6.

extended data:

classification:

1. Classification according to cementitious materials:

① inorganic cementitious materials concrete, such as cement concrete, gypsum concrete, silicate concrete, water glass concrete, etc

(2) organic binder concrete, such as asphalt concrete, polymer concrete, etc

2. Classification by apparent density:

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

3. Classification according to use function:

structural concrete, thermal insulation concrete, decorative concrete, waterproof concrete, fire-resistant concrete, hydraulic concrete, marine concrete, road concrete, radiation proof concrete, etc

4. Classified by construction technology:

centrifugal concrete, vacuum concrete, grouting concrete, shotcrete, roller compacted concrete, extruded concrete, pumping concrete, etc. According to the way of reinforcement: plain concrete, reinforced concrete, steel mesh cement, fiber concrete, prestressed concrete, etc

5. According to the workability of mixture:

dry hard concrete, semi dry hard concrete, plastic concrete, flow concrete, high flow concrete, flow concrete, etc

source of reference: Internet - ordinary concrete