Polymer modified bitumen or PMB is a kind of bitumen modified by adding polymer. Bitumen, also called asphalt or tar, is a sticky, black, highly viscous liquid used in the construction of roads, roofs, and other structures. Byadding polymers to bitumen, it improves the properties of bitumen, making it more durable, flexible, and resistant to weathering and deformation.
The most used polymers to modify bitumen are Styrene Butadiene Styrene (SBS) and Ethylene Vinyl Acetate (EVA). SBS is a thermoplastic elastomer that mixes easily with bitumen at elevated temperatures. The addition of SBS improves the viscosity, elasticity, and thermal stability of bitumen. EVA, on the other hand, is a thermoplastic polymer that is more flexible than SBS. The addition of EVA improves the adhesion, tensile strength, and low temperature properties of bitumen.
PMB is widely used in road construction, especially in the production of high-performance asphalt mixtures. PMB can be used as a binder in asphalt mixtures or as a surface treatment for asphalt pavements. PMB improves the resistance of asphalt mixtures to rutting, cracking and deformation, extending the life of asphalt pavements. PMB also reduces the sensitivity of asphalt pavements to temperature changes and increases their resistance to aging, oxidation and water damage.
PMB is produced by mixing bitumen and polymer at elevated temperatures in a high shear mixer. The mixing process must be carefully controlled to ensure homogeneity of the mixture and proper dispersion of the polymer. The resulting PMB has higher viscosity, lower penetration, and higher softening point than regular bitumen. PMB properties can be further optimized by adjusting the type and amount of polymer, mixing temperature, and mixing time.
In summary, polymer-modified bitumen is a highly effective and widely used material in road construction. Adding polymers to bitumen improves its properties and extends its life. PMB is a careful mixture of bitumen and polymer at high temperature and has superior properties compared to ordinary bitumen. The use of PMB in road construction is expected to increase in the future as it offers significant benefits in terms of durability, safety, and sustainability.
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