Cold asphalt with emulsion bitumen

bitumen 60/70

Cold asphalt, also known as cold mix asphalt or cold patch, is a type of asphalt mixture that can be used for road repairs and pavement maintenance without the need for hot-mix asphalt plants or extensive heating. It is called "cold" asphalt because it can be used at ambient temperatures, without the need for additional heating.

Cold asphalt is typically composed of bitumen emulsion or cutback bitumen, aggregates (such as crushed stone or gravel), and additives that help improve workability and adhesion. The bitumen used in cold asphalt is usually a slow-curing or medium-curing type, which allows the mixture to set and harden at ambient temperatures.

One of the advantages of cold asphalt is its convenience and ease of use. It can be applied directly from the bag or container onto potholes, cracks, or other damaged areas of the pavement. The material can be compacted with hand tools or compacting equipment, and traffic can resume shortly after the repair is completed.

Cold asphalt is commonly used for temporary repairs, emergency repairs, and in situations where hot-mix asphalt is not readily available or practical. It is often used in colder climates or during winter months when hot-mix asphalt plants may be closed or inaccessible.

It's important to note that cold asphalt may not have the same long-term durability and performance as hot-mix asphalt, especially in high-traffic areas or under heavy loads. Therefore, it is typically considered a temporary solution until a more permanent repair with hot-mix asphalt can be completed.

Overall, cold asphalt provides a quick and convenient option for minor repairs and temporary fixes in asphalt pavement, offering a temporary solution until hot-mix asphalt can be applied.

Cold asphalt production plants can be designed and operated continuously or in batches, with the continuous method being more common. In a continuous cold asphalt plant, the stone materials are not heated in the factory. Instead, hot emulsion bitumen is injected into the stone materials. These plants do not have burners, dryers, dust collectors, or grading machines. However, they may have hot bins and silos for storing mixed materials, which are optional.

Cold asphalt factories are simpler compared to hot asphalt factories and are often mobile and prepared as prefabricated units. They can also be used to produce cold asphalt with foamed bitumen. Foamed bitumen is produced by blowing air into the bitumen under pressure using nozzles. When the pressure is released, the water expands along with the air, creating foamed bitumen, which is then used to cover the cold asphalt materials.

In a continuous cold asphalt plant, the materials are pre-graded before entering the plant using calibrated feeders. The aggregates are then weighed with the help of a conveyor belt along with cement or hydrated lime as filler and enter the mixer. Pre-mixed single-size aggregates are fed into the plant using pre-calibrated and proprietary variable speed conveyor-shaped feeders. These feeders are adjusted to meet the percentage required in the final mix specification. Cement, hydrated lime, or filler is added before the weight section on the conveyor belt using a silo and a weight reduction system. The weighing conveyor measures the weight of the total wet material, including the dry filler.

The aggregates and filler are continuously discharged into a paddle mixer. The paddle mixer is a wide mixer with a rotary plate mounted at the end of the discharge section. The signal from the weighing conveyor controls the measurement of bitumen or emulsion, which is injected into the continuous mixer through the spray bar.

In summary, continuous cold asphalt plants inject hot emulsion bitumen into stone materials without heating them in the factory. They are simpler than hot asphalt plants and may have optional hot bins and silos for storing mixed materials. Foamed bitumen can also be produced in these plants. The materials are pre-graded and weighed before entering the continuous mixer, where bitumen or emulsion is injected.

The cold mixture can be discharged into trucks directly, through a conveyor, or via a funnel. In direct truck loading, a control system is set up to produce the specific quantity required in each truck. In a cold batch asphalt plant, a paddle mixer with bottom discharge is used instead of a continuous mixer, and a bitumen weighing hopper replaces the bitumen metering system. Each batch is made separately. On the other hand, in a continuous cold asphalt plant, the size of each truckload or silo capacity is determined for production.

Continuous unloading into trucks from a large hopper allows for continuous production, and capacities of up to 400 tons per hour can be easily achieved in cold asphalt factories.

It is important to note that pre-prepared aggregates of the same size must be used to feed the plant, and the performance of the final cold asphalt product may be limited. However, ongoing development of these cold asphalt plants is currently underway.

The benefits of cold asphalt plants include:

- Low initial cost of equipment

- Low operating and maintenance costs

- Low cost of the final mixture

- Reduced environmental impact, as there is no need to heat and dry the aggregates

- Simple design

- Easy adaptation for mobile and prefabricated designs

- Ability to achieve high production capacities

- Ability to produce small batches

- Production without material waste

- No need for storage of mixed materials

- Ability to incorporate reclaimed asphalt pavement (RAP)

In summary, cold asphalt plants offer advantages such as cost-effectiveness, reduced environmental impact, simplicity, and the ability to achieve high production capacities. Ongoing advancements in cold asphalt plant technology are being made to further improve their performance.

ATDM CO is a reputable manufacturer and exporter of Bitumen 60/70 and Bitumen 80/100. We specialize in offering high-quality bitumen products in various packaging options, including drums, bags, and bulk quantities. Our product line consists of three distinct quality grades: premium, second, and third types. Each grade is produced with meticulous attention to detail, utilizing advanced facilities and processes.

Our diverse range of options is designed to cater to the specific needs and volume requirements of our customers. Whether you require a smaller quantity for a specific project or a larger bulk order, we have the flexibility to accommodate your demands.

At ATDM CO, we prioritize product quality, reliability, and customer satisfaction. Our bitumen 60/70 is manufactured to meet international standards, ensuring optimal performance and durability in various applications. Currently, we have supplies in three countries of the United Arab Emirates (Dubai), Panama and Singapore are available. We take pride in delivering exceptional products that meet the diverse needs of our valued customers, both domestically and internationally.

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