The classification of penetration-grade bitumen is based on the Penetration Test. In this test, a standard needle is placed on the surface of the bitumen under specific conditions for a defined period of time, and the depth of penetration is measured. The higher the penetration value, the softer the bitumen, while a lower penetration value indicates harder bitumen.
Characteristics of penetration-grade bitumen.
- Good adhesion to aggregate materials.
- Good resistance to water penetration.
- Suitable flexibility under various weather conditions.
- Acceptable durability and service life in road pavements.
- Ability to be used in the production of various types of hot asphalt mixtures.
When is penetration-grade bitumen used?
- Road construction and maintenance.
- Construction projects.
- Areas with different climatic conditions.
- Heavy traffic projects.
Difference between penetration-grade bitumen and viscosity-grade bitumen.
Although both products are used in the road construction industry, their classification methods are different. Penetration-grade bitumen is classified based on the penetration depth of a standard needle, while viscosity-grade bitumen is classified according to the bitumen’s resistance to flow at specific temperatures. Today, the use of viscosity-grade bitumen and Performance Grade (PG) bitumen has become more common in many large-scale projects due to their more accurate evaluation of performance.
Conclusion
قیر نفوذی یکی از مهمترین و پرکاربردترین انواع قیر در صنعت راهسازی است که بر اساس میزان سختی یا نرمی درجهبندی میشود. انتخاب صحیح گرید قیر با توجه به شرایط اقلیمی، نوع پروژه و حجم ترافیک، تأثیر مستقیمی بر کیفیت، دوام و عملکرد روسازی خواهد داشت. به همین دلیل، شناخت ویژگیها و کاربردهای قیر نفوذی برای پیمانکاران، مشاوران و فعالان صنعت راهسازی از اهمیت بالایی برخوردار است.
