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Penetration Grade Bitumen

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By Author: Ronald
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Penetration grade bitumen is a commonly used term in the field of asphalt and road construction. Bitumen, also known as asphalt, is a black, sticky, and highly viscous liquid or semi-solid form of petroleum. It is a crucial component in the construction of roads, highways, and other infrastructure.
Penetration grade is a measure of the hardness or consistency of bitumen. It is determined by the depth in tenths of a millimetre to which a standard needle will penetrate vertically into a sample of bitumen under specified conditions of loading, time, and temperature. The test method for determining penetration is outlined in various standards, such as ASTM D5 and AASHTO T49.
The penetration grade is an indication of the bitumen's stiffness at a certain temperature. Bitumen with a higher penetration grade is softer and more flexible at a given temperature, while a lower penetration grade indicates a harder and less flexible bitumen. Different penetration grades are used for different climate conditions and types of road construction. Common penetration grades include:

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