what is Anionic Bitumen Emulsion?
ZUMRUT KIMYA is a reputable supplier of high-quality anionic bitumen emulsion, which is produced by dispersing bitumen in water with the aid of a surfactant. The choice of emulsifier is crucial for the quality and characteristics of the product, as it is categorized based on the charge of their particles. Two primary types of emulsifiers are employed: anionic and cationic.
Anionic bitumen emulsions are formed by the movement of bitumen particles under an electric field, with the tail portion aligning itself within the bitumen and the positive portion remaining in the water. This negative charge causes all droplets to repel each other, resulting in the suspension of distinct bitumen drops.
The difference between anionic and cationic emulsions lies in the electric charge. Anionic emulsions carry a negative charge, while cationic emulsions are positively charged. The choice of emulsifier plays a crucial role in determining the efficiency and reliability of the product.
Anionic emulsions exhibit less versatility and are most effective when used with alkaline minerals. The quantity of emulsifier applied directly affects the emulsion’s breakdown rate, which refers to the duration until the bitumen returns to its original state.
Types of Anionic Bitumen Emulsion:
Rapid Setting :RS-1 ,RS-2 , HFRS-2
Medium Setting :MS-1 ,MS-2 ,MS-2h ,HFMS-1 ,HFMS-2 ,HFMS-2s
A suffix of “h” or “s” at the end of the emulsion grade indicates that a hard or soft base asphalt was used. Some anionic emulsions are designated “HF” for “high float,” which indicates that chemicals were used to give the asphalt a thicker film. When applied to an aggregate surface, this helps more of the asphalt film stay in place on the aggregate particles without draining into the pavement structure.
Application
This anionic bitumen emulsion has a lot of versatility in its applications throughout different stages of road construction and maintenance.
Among its main uses are applications in prime coating, where the solution of bitumen in water is applied to the base layer of roads for the purpose of giving strength to the wearing surface, developing a bonding layer for asphalt. It enhances the durability and load-carrying capacity of the pavement.
The second major application is tack coating, which works as an adhesive between the two layers of asphalt. This ensures strong interlayer bonding to avoid delamination and to further enhance the structural integrity of the road.
Anionic bitumen emulsion, on the other hand, shows application in surface dressing, where it would bind aggregates onto the road surface to enhance skid resistance and seal the pavement against water ingression, hence prolonging its life.
Moreover, it is also used in the making of cold mix asphalt, wherein the aggregates are mixed with bitumen at ambient temperature. The process is cost-effective and also considered to be environmentally friendly because heating is not required.
Besides, anionic emulsions have a wide use in crack sealing, which seals minor cracks in pavements from water penetration, hence reducing further damage.
These diverse applications make anionic bitumen emulsion indispensable in road construction and maintenance processes, while making the structure safer and more durable.
Storage-stable Anionic Emulsions
Because anionic bitumen emulsions have a long shelf-life, many engineers consider it more suited for transport into remote locations than their cationic countertype. This knowledge stems from years of practical experience. Also, the product has earned the reputation of best choice for use in rural and remote road construction. In such places, the surrounding infrastructure is often insufficient, such as appropriate storage conditions. Also, construction rates are slow. Thus, anionic emulsions are the most appropriate choice here.
Packing
Anionic bitumen emulsion is typically packed in sealed, leak-proof containers to protect it from air and moisture exposure. Common options include drums, Intermediate Bulk Containers (IBCs), and bulk tankers.
Drums are stackable, stackable containers that can be easily transported by truck or ship. IBCs are large containers with a capacity of up to 1000 liters, ideal for easy handling and storage on construction sites. Bulk tankers, with a capacity of up to 30,000 liters, are suitable for large construction projects or long-distance transportation. The choice of packing depends on the amount of material needed, transportation and storage conditions, and application method. Storage should be in a cool, dry place away from direct sunlight and heat sources.
Conclusion
Anionic bitumen emulsion is a vital material in road construction, offering a balance of efficiency, safety, and environmental benefits. Its compatibility with positively charged aggregates and ability to work without heating make it a preferred choice for many applications. By understanding its composition, production, and uses, engineers and contractors can make the most of this innovative material for sustainable and durable infrastructure.
