The proportion of the continuous gradation of crushed stone composition is calculated in concrete

<>2. The concept of continuous gradation:

It is the name in the standard, and it is called discontinuous gradation in the relevant books. Strictly speaking, there is a difference between the two, discontinuous gradation is to remove one (or several) particle fraction in continuous gradation, forming a gradation discontinuous mineral mixture, the gradation of this mineral mixture is called intermittent gradation, that is, the screening curve appears in a horizontal section, and the difference between single particle fraction and intermittent gradation is that the particle size range of single grain fraction is relatively smaller than that of intermittent gradation. Single-grain coarse aggregate can also be configured with dense and high-strength concrete, and the amount of unilateral concrete cement is smaller than that of continuous graded coarse aggregate, but it is only suitable for plastic concrete, and vibration must be strengthened.

Continuous gradation: refers to the use of a set of standard sieve with the size of the sieve hole to sieve a mineral mixture for sieve analysis, the gradation curve obtained is a smooth curve, with a continuous line, there is a certain proportion relationship between the adjacent particle size, this from large to small, each particle size has it, and according to the mass proportion of the composition of the mineral mixture, called continuous gradation mixture. The concrete mixture with continuous gradation coarse aggregate configuration has good workability, is not easy to produce segregation, and can obtain a dense concrete body after proper vibration, which is suitable for any fluidity concrete, especially large-fluidity concrete.

As for the grading requirements, you can refer to the "Quality Standards and Inspection Methods for Crushed Stone or Pebbles for Ordinary Concrete", as well as your training materials, bridge regulations, and many places have grading requirements. . . Nowadays, the average owner will require continuous grading.

The first is to adapt to the bulk density of the mixing ratio of the three materials, choose the largest, and the second is to do the synthesis and grading screening of the three materials.

Graded gravel mix ratio: 19% 2-3 stones, 27% 1-2 stones, 22% stones, 32% stone powder.

The particle size, gradation and quality of graded gravel filler in the transition section of the roadbed should meet the design requirements.

The content of needle and flake gravel in gravel particles is not more than 20%; The content of soft and fragile crushed stone should not exceed 10%. <

Graded sand and gravel specification requirements:

1. The abrasion rate of Los Angeles with a particle size greater than the particle size should not be more than 30%, and the immersion loss rate of sodium sulfate solution should not be more than 6%.

2. The liquid limit of fine particles with particle size less than 25% should not be greater than 25%, and the plasticity index should be less than 6.

The construction unit sampled and inspected the Los Angeles abrasion rate, sodium sulfate solution immersion loss rate, liquid limit and plasticity index twice in each yard.

Graded gravel fit is as follows:

1. The abrasion rate of particle size larger than the particle size should not be more than 30%, and the immersion loss rate of sodium sulfate solution should not be more than 6%.

2. The liquid limit of fine particles with particle size less than 25% should not be greater than 25%, and the plasticity index should be less than 6.

The graded crushed stone particle grading inhomogeneity coefficient cu shall not be less than 15, the mass percentage of the following particles shall not be greater than 3%, and the mass percentage of particles with crushing surface in the coarse particles greater than shall not be less than 30%.

Scope of application. Graded aggregate can be used as the base and subbase of asphalt pavement and cement concrete pavement, and can also be used as a subgrade improvement layer. Graded aggregates can be used in different climatic zones on roads with different traffic classes under the premise of good drainage. The use of graded aggregates is particularly advantageous in humid and rainy areas.

The graded aggregates are used for different levels of the pavement or for different positions in the pavement, depending on the characteristics of the material itself, the quality of the material, the climatic conditions, the composition and volume of traffic, and the experience of use in each country and region.

Summary. Hello Kiss is happy to answer this question for you. How much is the appropriate mix ratio of graded gravel soil:

Graded gravel is a mixture composed of aggregates of various sizes and different particle sizes, and when its gradation meets the provisions of the technical specifications, it is called graded aggregate. Coarse and fine crushed stone aggregates and stone chips each account for a certain proportion of the mixture, when its particle composition meets the requirements of dense gradation, it is called graded crushed stone. First, the proportion of graded gravel composition is convenient to control the gradation of the mixture, and the material should be prepared according to 6 gears, respectively:

900-600mm, 300-600mm, 20mm 30mm gravel, 10mm 20mm gravel, 5mm 10mm gravel, 0 5mm stone chips construction management should be based on the needs of the site schedule, targeted measures should be taken to control the quality of raw materials. Second, the mix ratio of graded gravel is graded with gravel (20mm-40mm): natural sand:

Water =::3. Graded crushed stone refers to the mixed material of sand or gravel particle size (particle size) mixed in a certain proportion for foundation or other purposes, and its ratio is different according to the specific engineering design.

Hello Kiss is happy to answer this question for you. How much is the appropriate mix ratio of graded gravel soil: graded gravel is a mixture composed of aggregates of various sizes and different particle sizes, and when its gradation meets the provisions of the technical specifications, it is called graded aggregate.

Coarse and fine crushed stone aggregates and stone chips each account for a certain proportion of the mixture, when its particle composition meets the requirements of dense gradation, it is called graded crushed stone. First, the proportion of graded gravel is convenient to control the gradation of the mixture, and the material should be prepared according to 6 gears, namely: 900-600mm, 300-600mm, 20mm 30mm gravel, 10mm 20mm gravel, 5mm 10mm gravel, 0 5mm stone chips construction management should be based on the needs of the site schedule, targeted measures to control the quality of raw materials.

Second, the mix ratio of graded gravel is graded with gravel (20mm-40mm): natural sand: water = ::

3。Graded gravel refers to the mixed material of sand or gravel particle size (particle size) mixed in a certain proportion for foundation or other purposes, and its ratio is different according to the specific engineering design.

Pro,:3 gradation is a mix ratio of gravel (20mm-40mm): natural sand: water =:3.

Summary. The mix ratio is 1Compact skeleton type. Cement: gravel = 78:22 Suspended dense structure type. Cement: gravel = 71:29 51:49.

What is the mix ratio of 4% cement stabilized graded gravel?

The mix ratio is 1Compact skeleton type. Cement: gravel = 78:22 Suspended dense structure type. Mizuno Absolute Mud: Crushed and Talc = 71:29 51:49.

Sidestep the question? Kiss. Don't you talk about matching?

4. Mix ratio of water-stabilized layer.

19 Gravel: Gravel: Gravel:

Stone chips % cement stabilized gravel mix ratio: cement: aggregate = 4:

100 Maximum Dry Density: Optimal Moisture Content % Cement Stabilized Crushed Stone Mix: Cement:

Noisy jujube aggregate = 5:100 Maximum dry density: the best moisture content of the highest liter of demolition % cement stabilized gravel mix ratio:

Cement: aggregate = 6:100 maximum dry density:

Zhenqiao Optimal water content: OK

Answer 1: Graded sand and gravel refers to a mixed material formed by sand and water as a basic structure or other purposes in a certain proportion. Its ratio will also vary depending on the design, so there are some differences.

2. If it refers to natural grade, the ratio between natural sand and water needs to be configured according to the proportion.

………I don't quite understand what you're talking about.

It is the result of blending according to the selected several kinds of gravel, first of all, it is necessary to single screen the gravel of each specification, and the blending is completed according to the use, so that the blending value meets the requirements of the specified range.

The scope of the regulations is different for different uses, and there is no specific test data, so there is no way to give you a ratio, and I hope to ask a specific point to help you.