Hot Mix Asphalt Machine: Asphalt Drum Plant

 

Types of asphalt concrete

Asphalt concrete pavement should use appropriate hot mix asphalt mixture according to usage conditions, environment, construction conditions, pavement properties, highway grade, etc. The following types are commonly used:

1. Ordinary asphalt mixture

That is AC type asphalt mixture, which is suitable for urban secondary roads, auxiliary roads or sidewalks.

2. Modified asphalt mixture

Modified asphalt mixture refers to an asphalt mixture made by adding rubber, resin, high molecular polymer, finely ground rubber powder or other fillers and other additives (modifiers) to improve the performance of asphalt or asphalt mixture.

Compared with AC-type asphalt mixture, modified asphalt mixture has higher high-temperature rutting resistance, good low-temperature resistance to cracking, higher wear resistance and longer service life. The modified asphalt mixture surface layer is suitable for urban expressways and trunk roads.

3. Asphalt masculine mixture (SMA for short)

SMA mixture is a mixture composed of asphalt, mineral powder and fiber stabilizer, which is filled in the discontinuous skeleton. SMA is a discontinuously graded asphalt mixture. The proportion of coarse aggregate over 5mm is as high as 70%~80%, the amount of mineral powder is 7%~13% and the amount of asphalt is relatively high, up to 6.5%~7%.

SMA is an asphalt surface mixture with strong deformation resistance and good durability that is currently used at home and abroad; it is suitable for urban expressways and main roads.

4. Modified (asphalt) asphalt masala gravel mixture

This type uses modified asphalt and adopts SMA structure type. It has very good high-temperature anti-rutting performance, low-temperature anti-deformation performance and water stability, and has a large structural depth, good anti-skid performance, and greatly improved aging resistance and durability.

Types of asphalt mixing plants

The hot mix asphalt machine is a complete set of equipment used for batch production of asphalt concrete. The asphalt mixing station uses aggregate, powder and asphalt as raw materials and mixes them according to a certain mix ratio. According to the mixing method, it can be divided into batch type and continuous type. According to the transportation method, it can be divided into stationary, mobile and semi-fixed.

The quality control of asphalt mixing plant

1. Asphalt temperature control

Asphalt temperature is one of the important factors affecting the quality of asphalt mixture. During the production process, the temperature of asphalt must be strictly controlled to ensure that it is within the specified range. Generally speaking, the temperature of asphalt should be maintained between 130℃-170℃.

2. Aggregate gradation control

Aggregate gradation is an important indicator of asphalt mixture, which directly affects the strength and stability of the mixture. During the production process, the gradation of aggregates must be controlled through testing and inspection to ensure that it meets specified requirements.

3. Asphalt mixture oil-stone ratio control

The asphalt mixture oil-stone ratio refers to the ratio of the mass of asphalt in the asphalt mixture to the total mass of aggregates and fillers. During the production process, batching must be carried out in strict accordance with the design requirements of the oil-stone ratio, and the oil-stone ratio must be controlled through testing and inspection.

4. Mixing time control

The length of mixing time also affects the quality of asphalt mixture. During the production process, mixing must be carried out strictly in accordance with the mixing time requirements to achieve a uniform and consistent effect.

5. Equipment maintenance

The asphalt drum plant maintenance is also one of the important factors to ensure the quality of asphalt mixing plants. Equipment must be inspected and maintained regularly to ensure the integrity of the equipment and the stability of its operation.

Original source: https://www.haomei-machinery.com/a/hot-mix-asphalt-machine-asphalt-drum-plant.html

How to Build An ECO-friendly Hot Asphalt Plant

The environmental pollution such as smoke, dust, noise and high energy consumption generated by the hot asphalt plant during the production process has always been criticized. Asphalt batching plant with with large pollution and high energy consumption has been ordered to shut down in many countries. How to build an ECO-friendly hot mix asphalt plant for sale? There are some measures for dust prevention.

1. Site management

Site management can reduce dust emissions and improve the comfort of the plant. Sprinkle water on the roads and try to reduce the dust caused by the loader and truck in the dry weather. Negative pressure devices are provided in those places including the screening, metering, mixing and hot aggregate bin.

2. The dust removal system of the cold storage

The dust of asphalt hot mix plant is mainly produced by cold material feeding and heating. The cold aggregate feeding belt is equipped with a separate dust removal system. During production, the fan is turned on and the pulse dust collector starts working.

3. Dust removal system of the mixing tower

The mixing tower is equipped with negative pressure devices. The dust removal system adopts atmospheric back blowing dust removal and two-stage dust removal, which effectively prevents the phenomenon of dust overflow.

4. A closed management of the mixing tower

In order to control the problem of disorderly discharge of dust, the mixing tower is completely closed and treated with negative pressure. There is also a temporary overflow storage bin for the centralized treatment when the bin is full, effectively preventing the dust caused by continuous overflow.

5. Closed storage of cold materials
The cold aggregate is stored in a closed plant or silo. The fully enclosed design of the material yard prevents the dust from escaping outwards, and also prevents the aggregates from being exposed to rain to increase the moisture content of the aggregates, thus reducing the additional energy consumption caused by drying the aggregates.

It is certain that for the ECO-friendly hot mix asphalt plant, they are all equipped with advanced bag dust removal system.

Original source: https://www.haomei-machinery.com/a/how-to-build-an-eco-friendly-hot-asphalt-plant.html

The Production Quality Control of Hot Mix Asphalt Plant

It is necessary to strengthen the installation and maintenance of the hot mix asphalt plant for sale, thus ensuring the safe and efficient operation of the whole plant. It also will ensure the quality of the asphalt mixture and improve its own economic benefits. How to control the production quality?

1. Minerals

In the construction process, the coarse ore material is the gravel of which the size is from 2.36mm to 25mm. During the construction process, the coarse aggregate must be cube particles after being crushed.

2. Asphalt

Before using, all indicators of the asphalt must be checked to ensure its quality. When selecting asphalt grades, be sure to investigate the local climate. When the temperature is low, the ones with high asphalt grades should be selected, mainly because the high-grade asphalt has better crack resistance when paved.

3. Aggregate

Aggregate is the main factor that affects the strength of asphalt concrete. The key part that controls the aggregate grading is the vibrating screen. The mud content of the aggregate will also affect the adhesion performance of the aggregate and asphalt and the stability of the mixture. Therefore, before mixing the mixture, the muddy aggregate should be cleaned.

4. Temperature control

The mixing temperature determines the viscosity of the asphalt. At high temperatures, the asphalt has a high fluidity, so that the aggregate can be completely wrapped. However, if the mixing temperature is too high, the aging of asphalt will be very serious.

Generally, the mixing temperature of the hot asphalt mixture is 130～160℃, and the modified asphalt mixture temperature should be 10～20℃ higher than that of the ordinary asphalt mixture.

5. Mixing ratio

The mix ratio of the asphalt is determined by numerous test in the laboratory. During the production, each material should be feed in a certain order. During the mixing process of hot mix asphalt plant, all aggregate particles should be wrapped by the asphalt. The mixing time should be controlled between 45-90 seconds, and must be checked at any time.

As a big asphalt batching plant manufacturer, Haomei Machinery has made several innovative improvement in aggregate grading and asphalt weighing and spraying, thus ensuring the asphalt mixture in accordance with strict mixing ratio.

Original source: https://www.concretebatchplanthm.com/a/the-production-quality-control-of-hot-mix-asphalt-plant.html