What Is Bitumen? Properties, Types, and Storage Methods
Bitumen is a black or dark brown hydrocarbon-based material obtained during the refining of crude oil or found naturally in certain geological deposits. It is a highly viscous, waterproof binder with excellent adhesion properties. Produced from the heavy residue remaining after the distillation of crude oil, bitumen is one of the most important construction materials used in road paving, asphalt production, waterproofing, and infrastructure projects thanks to its flexibility, durability, and long service life.
Throughout history, bitumen has been used since ancient civilizations, particularly in Mesopotamia, as a waterproofing and construction material. Today, with modern engineering technologies, it is widely used in highways, airport runways, bridge decks, roofing membranes, industrial flooring, and many other civil engineering applications.
What Are the Types of Bitumen ?
Bitumen is classified into four main categories depending on its intended application, climatic conditions, and the construction requirements of the project.
1. Penetration Grade Bitumen (Conventional Bitumen)
Penetration grade bitumen is the standard form of bitumen obtained directly from crude oil refining. It is the primary binder used in hot mix asphalt (HMA) production for road construction. The material is classified according to its penetration value, which indicates its hardness and consistency. The most commonly used grades are 50/70, 70/100, 100/150, and 160/220, each designed for different climatic conditions and pavement performance requirements.
2. Bitumen Emulsion
Bitumen emulsion is produced by blending bitumen with water and emulsifying agents using high-speed bitumen emulsion plants. It is widely used for tack coats, prime coats, surface dressing, and waterproofing applications before hot asphalt paving. Since it can be applied at lower temperatures, it offers environmental and economic advantages.
Cationic Bitumen Emulsion: Reacts quickly with mineral aggregates, making it the preferred choice for most road construction and asphalt maintenance projects.
Anionic Bitumen Emulsion: Breaks and cures more slowly, making it suitable for waterproofing systems and specific civil engineering applications.
3. Cutback Bitumen
Cutback bitumen is produced by blending penetration grade bitumen with petroleum-based solvents such as kerosene or diesel to reduce its viscosity and improve workability at lower temperatures. Before bitumen emulsions became widely available, it was extensively used for prime coating and road construction applications. Today, however, its use has significantly declined due to environmental concerns, higher costs, fire hazards, and VOC emissions, with bitumen emulsions becoming the preferred, safer, and more sustainable alternative.
4. Polymer Modified Bitumen (PMB)
Polymer Modified Bitumen (PMB) is produced by enhancing conventional bitumen with polymers such as SBS (Styrene-Butadiene-Styrene) or EVA (Ethylene Vinyl Acetate) to improve its mechanical performance. PMB provides superior resistance to heavy traffic loads, rutting, cracking, fatigue, and extreme temperature variations. It is widely used in high-performance asphalt pavements, particularly Stone Mastic Asphalt (SMA), airport runways, bridges, highways, and other demanding infrastructure projects. PMB is also used in waterproofing membranes, where its enhanced flexibility and heat resistance ensure long-term durability and excellent sealing performance.
How Is Bitumen Supplied and Transported ?
Bitumen supply and transportation methods vary depending on whether the material is handled in liquid or solid form.
Liquid Bitumen Supply and Transportation
In most countries, bitumen is supplied and transported in its liquid state directly from refineries. To maintain proper flow characteristics, loading, unloading, and transfer operations are typically carried out at temperatures above 110°C. During road transportation, insulated bitumen tanker trucks are used to minimize heat loss and ensure the material remains pumpable throughout long-distance delivery to asphalt plants or construction sites.
Solid Bitumen (Drums & Big Bags)
For international shipments and overseas transportation, liquid bitumen is often converted into solid form to reduce transportation costs and improve handling safety. Solid bitumen is packed in steel drums or Big Bags and transported in standard shipping containers or trailers.
Important Note: Before solid bitumen can be used for asphalt production or waterproofing applications, it must be reheated and converted back into liquid form. This process requires a high-efficiency bitumen melting plant, such as a drum bitumen melter or Big Bag bitumen melter, ensuring fast melting, energy efficiency, and continuous bitumen supply.
How Is Bitumen Stored on Construction Sites?
To maintain its properties after delivery or melting, bitumen must be stored at the required application temperature without losing heat or performance. This is achieved using insulated bitumen storage tanks equipped with efficient heating systems. These tanks are commonly integrated with thermal oil heaters or electric heating systems to prevent the bitumen from solidifying while ensuring a continuous and reliable supply for asphalt production and waterproofing applications.
What Are the Most Common Bitumen Equipment ?
From production and transportation to storage and application, the following equipment plays a vital role in modern bitumen handling systems:
Bitumen Storage Tank: Insulated vertical or horizontal tanks designed to store hot bitumen while minimizing heat loss.
Bitumen Melting Plant: Systems that efficiently melt solid bitumen supplied in steel drums or Big Bags, converting it back into liquid form for use.
Bitumen Emulsion Plant: Equipment used to produce high-quality bitumen emulsions for tack coats, prime coats, and road maintenance applications.
Polymer Modified Bitumen (PMB) Plant: Plants that blend bitumen with polymers such as SBS to produce high-performance binders with enhanced durability and flexibility.
Cutback Bitumen Plant: Systems designed to manufacture cutback bitumen by blending penetration grade bitumen with petroleum-based solvents.
Bitumen Storage Pool: Large-capacity underground or above-ground storage solutions for bulk bitumen stockpiling in industrial facilities.
Bitumen Tanker (Road Tanker): Insulated tanker trailers used for the safe transportation of hot liquid bitumen over long distances.
Asphalt Distributor Truck: Truck-mounted equipment that sprays bitumen or bitumen emulsion evenly onto road surfaces for prime coat, tack coat, and surface treatment applications.
Get Expert Support for Bitumen Equipment and Plant Solutions
Whether you need bitumen melting plants, bitumen storage tanks with thermal oil heating systems, or complete bitumen emulsion plants, MBA provides reliable and efficient engineering solutions tailored to your project requirements. Contact our experienced team today for technical consultation, detailed information, or a customized quotation for your bitumen production and storage needs.