Can asphalt concrete mix design be cited

No. 1. Before adding asphalt, the gradation of various aggregates and fillers is different, and the gradation of each material must be obtained through screening, and the gradation after mixing various materials together must meet the range required in the specification, so the mass ratio of the material can not be referenced;

2. Asphalt performance is different, which must also be considered;

3. All kinds of materials, including asphalt, their density can never be applied, because the density is related to the porosity saturation of the asphalt mixture and other important technical indicators.

In recent years, asphalt pavement has dominated the road surface. With the rapid development of China's national economy, the highway traffic volume is getting larger and larger, the axle load is growing rapidly, the vehicle speed is constantly improving, and the quality problems of asphalt pavement are also increasing. This puts forward higher and higher requirements for the quality of asphalt pavement, and the important factor affecting the performance of asphalt surface course is the gradation composition of the mixture.

I just have an article on asphalt concrete mix design.

Dear, hello to the asphalt mixture mix design method: one is to determine the mix ratio of the ore, the other is to determine the amount of asphalt. Asphalt mixture mix design is based on the test, inspection, adjustment, improvement of a technical work, only in stages, and combined with the test, construction equipment repeated verification, adjustment, in order to obtain satisfactory mix design results.

1. The target mix ratio target mix design is basically completed in the laboratory, which is the basic work of the mixture composition design, including raw material test, mixture composition design test and verification test, and the proposed mix ratio is called the target mix ratio. Specific design steps: (1) Determination of mixture type and grading range (2) Selection and determination of raw materials (3) Selection of mineral gradation (4) Marshall test (6) Road performance inspection (5) Determination of the best asphalt dosage.

2. Production mix ratio production mix ratio adjustment should be combined with the mixing building, there are two types of mixing buildings used in production at present, one is the continuous mixing building, as long as the flow rate of the cold material bin is adjusted to meet the target mix ratio requirements, the mixing can be heated, and the production mix ratio design is not required; The other type is the batch mixing building, which needs to heat and screen the aggregates, and then weigh and match the hot silos in the hall, and the proportion of the distribution is the production mix ratio. Because the mixing ratio of the ore material of each hot silo will be different from the matching ratio of each ore with the target mixing ratio, it is necessary to determine the matching ratio of the ore material of each hot silo through the test, and the secondary gradation is called on site. The purpose of adjusting the production mix ratio is to adjust the flow rate of each cold silo to meet the requirements of the design synthesis gradation on the basis of the target mix ratio, and to determine the mix ratio of the ore in each hot silo for the batch mixing building.

Specific design steps: (1) Adjustment of the flow rate of the cold silo (2) Determine the mixing ratio of ore in each hot silo (3) Determine the amount of asphalt. 3. Production mix verification The target mix ratio is completed in the laboratory, although the production mix has started the mixing building, but there is no formal mixing, and the production standard mix design stage needs to be formally mixed and paved with test roads.

At the same time, the mix ratio is further adjusted, and finally the mix ratio is determined as the basis for production control and quality inspection, which is called the production standard mix ratio. The production standard mix ratio is mainly to solve two problems: to determine the mixing temperature and to carry out the mixture material and performance analysis.

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Asphalt mixture with key ratio design:

Abstract:With the rapid development of China's economy, the transportation lines are also under construction at an unimaginable speed every year, and asphalt is used as a highway.

Construction is an important material, so it occupies a very important position. The main factor affecting the performance of asphalt is the mix ratio of slow and slow mixture, so the mix ratio of asphalt mixture has more practical significance for the construction quality of the highway.

1. Asphalt mixture mix ratio design.

Production mix design. Before designing the asphalt mixture mix, the size comparison can be selected according to the gradation type of the pavement structure.

Suitable vibrating screen, vibrating screen should also follow the following three principles when choosing: first, the vibrating bin of the vibrating screen should be made in the hot silo.

The material is maintained in equilibrium, which can also effectively improve the production efficiency.

Second, the selection of raw materials.

1. Under normal circumstances, asphalt concrete is composed of the following raw materials: fine aggregates, coarse aggregates of different specifications, filling materials and asphalt, etc. The principles to be followed in the selection of raw materials include good economy, high technology and relative environmental protection.

2. Selection of fine aggregates. Generally speaking, fine aggregates mainly include artificial sand, natural sand and stone chips and other materials, which are in asphalt mixtures.

The main function is to make the void between the coarse aggregate smaller, so that the stability of the asphalt mixture is higher. In the actual selection, not only its technical indicators should be considered, but also its wear resistance and adhesion to asphalt.