Selection of large-scale asphalt mixing equipment High-grade highways have strict requirements for black pavement equipment. Mixing, paving, and rolling are the three main processes of mechanized pavement construction. Asphalt concrete mixing equipment is an important factor in determining progress and quality. Mixing equipment is generally divided into two categories, namely continuous and intermittent. Due to the poor specifications of domestic raw materials, high-grade highways do not use the continuous roller type and require the forced intermittent type. There are many types of asphalt mixing equipment, with different mixing and dust removal methods, and different site requirements.

Analysis of common faults in asphalt mixing plants
In asphalt pavement construction, asphalt concrete mixing plants are key equipment to ensure construction quality and improve efficiency. In the construction of domestic high-grade highway pavements, almost all imported asphalt mixing plants are used. The general specifications are more than 160 hours. The equipment investment is large and is a very critical part of the pavement construction technology.
The efficiency of the asphalt mixing plant and the quality of the concrete produced are related to whether the asphalt concrete mixing plant fails and the type and probability of failure. Combining many years of experience in asphalt concrete production and electric flat truck construction, the causes of failures in asphalt concrete mixing plants are analyzed to provide some experience in promoting the development of asphalt concrete and ensuring the construction quality of high-grade asphalt pavement.

Asphalt mixture mixing equipment is a proportion of the investment in asphalt mixture mixing plants. It not only affects the normal production, but also directly determines the quality of asphalt mixture and the cost of use.
    The model of asphalt mixing equipment should be scientifically and rationally selected based on the annual output. If the model is too large, it will increase the investment cost and reduce the effective use efficiency of polyurethane products; if the equipment model is too small, the output will be insufficient, resulting in the failure to improve construction efficiency, thereby prolonging the operation time. , poor economy, construction workers are also prone to fatigue. Asphalt mixing plants below type 2000 are usually used for local construction roads or municipal maintenance and repairs, while type 3000 or above are mostly used in large-scale road projects such as highways, national highways, and provincial highways. Usually these projects have tight construction periods.

Among the construction techniques of currently completed and planned highways, more than 95% are semi-rigid base asphalt pavements. This road pavement structure has advantages in terms of construction cost and load-bearing, but it is prone to cracks, loosening, slurry, and voiding. , subsidence, insufficient subgrade strength, subgrade slippage and other deep-seated diseases. It is not easy to treat deep-seated road diseases. The traditional maintenance plan is generally: do not treat the deep-seated diseases in the early stage and let them develop; when the deep-seated diseases develop to a certain extent, cover them or add pavement; and when the deep-seated diseases are serious enough to affect traffic, Then carry out excavation treatment, that is, traditional large and medium-sized maintenance construction, and the disadvantages it brings are also very obvious, such as high cost, serious waste, impact on traffic, impact on the environment, etc. In such an environment, extending the service life of roads, reducing the cost and waste caused by road maintenance, and improving the overall quality of roads have become a new round of topics.

[1].Hot asphalt mixture is composed of aggregate, powder and asphalt. The management of raw materials mainly involves how to ensure the quality and safe production of raw materials in all aspects of storage, transportation, loading and unloading, and inspection.
1.1 Management and sampling of asphalt materials
1.1.1 Quality management of asphalt materials
(1) Asphalt materials should be accompanied by the original factory’s quality certificate and factory inspection form when entering the asphalt mixing plant.
(2) The laboratory shall take samples of each batch of asphalt arriving at the site to check whether it meets the requirements of the specification.
(3) After the laboratory sampling and inspection pass, the materials department should issue an acceptance form, recording the asphalt source, label, quantity, arrival date, invoice number, storage location, inspection quality, and the location where the asphalt is used, etc.
(4) After each batch of asphalt is inspected, no less than 4kg of material sample should be retained for reference.

As a novice who has just entered the road maintenance industry, today we will learn about the differences between emulsified asphalt and modified asphalt that we commonly use in road maintenance construction.
First of all, the obvious difference between emulsified asphalt and modified asphalt is that emulsified asphalt contains water, while modified asphalt does not.