Asphalt penetration number
PENETRATION GRADE BITUMEN
Penetration grade bitumen- road bitumen- paving grade bitumen
This penetration depth is empirically (albeit only roughly) correlated with asphalt binder performance. Therefore, asphalt binders with high penetration numbers.
Penetration Grade Bitumen is a standard bitumen usually used as a Paving Grade Bitumen essential for road construction and for the production of asphalt.
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Therefore, asphalt binders with high penetration numbers (called “soft”) are used for cold climates while asphalt binders with low penetration numbers (called.
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Description:The softening point is, therefore, an approximation of the equi-viscous temperature EVT for bitumen. The higher the PI, the more temperature susceptible will be the bitumen. The penetration grade bitumens have a thermoplastic property which causes the material to soften at high temperatures and to harden at lower temperatures. This may be done by placing the needlepoint in contact with its image reflected by the surface of the bituminous material. The designation is by penetration range only. The penetration bitumen grades range from 15 to for road bitumen. Descriptions of these test methods, which form the basis for most bitumen specifications, now follow.