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Bitumen standards

Bitumen standards

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Bitumen

Standards & Grades

Performance Grade (PG) bitumen is categorized based on traffic and pavement temperature. Modification and monitoring done here, are meant to simulate conditions and traffic volumes to enable us to longer the life span of the pavement and enhance the quality. The PG grading system is defined by two numbers, representing the pavement temperatures. The first number e.g.: PG 64-XX represents the highest pavement temperature in Celsius, while the second number e.g.: PG XX-22 represents the lowest. Note that these numbers are pavement temperatures, not the air temperatures (these pavement temperatures are derived from air temperatures). The high temperature is related to the effects of rutting and the low temperature relates to cold results such as fatigue cracking

Performance Grading Should consider the actual conditions of different paving projects, since it’s dominantly used for paving, such as strain relationship under the field load, traffic speed and volume and the pavement structure.

Performance Grading Should

Include measures describing stress: strain Relationships under field loading.

Consider the pavement conditions: Temperature, traffic speed, traffic volume, and pavement structure.

Include acceptance limits derived from experience and actual field performance: Variables that affect Binder Selection

Geographic Area: Air Temperature, solar radiation Pavement Temperature: Max & Min

Traffic volume: High, Medium, Low

Traffic speed: Fast, Slow

Pavement Structure: Strong, Weak Stress and strain Methods of Selection

Select base grade based upon Geographic Area, Air Temperature,Pavement Temperature

Adjust base grade based upon Traffic Speed & Traffic Volume

Application of Performance Grade (PG) Bitumen

PG52-28 is dominantly used in paving for both new construction and road care and also in both dense-graded and open-graded Hot Mix Asphalt (HMA). This product could also be used for sealing cracks in paving and also edges. Other applications include spraying in places like bridge deck and pavement protective membranes with fabrics.

PG58-22 is initially used in paving for both dense-graded and open-graded Hot Mix Asphalt (HMA) and also in road construction usages as well as spraying and crack sealing applications.

This grade is widely used in very cold areas.

PG58-34 is generally used in the higher elevation roadways. This grade is a paving asphalt cement dominantly used for the production of Hot Mix Asphalt (HMA). It could also be used for sealing the edges of new to old paving and cracks sealing.

PG58-40 is primarily used on the high elevation locations. This grade is paving asphalt for the production of Hot Mix Asphalt (HMA). It can be easily used for sealing purposes and crack treating as well.

PG64-22 is mostly used in paving for both new construction and pavement treatment projects and in both dense-graded and open graded Hot Mix Asphalt (HMA) as well as others. It can be easily used for sealing purposes and crack treating too. Other uses include spray applications for bridge decks and pavement protective layer with fabrics and some modifications. It has been reported that with proper aggregate selections and asphalt content, HMA with PG64-22 as the binder may show less tenderness compared to a similar mixture with a lower viscosity/softer asphalt. This will lead to a significant reduction of typical tenderness problems of mixture shoving and checking during pavement surface scuffing and rolling and markings caused by traffic immediately after paving.

PG64-28 is primarily used in road construction and paving for new and pave care projects and in both dense-graded and open-graded HMA. Other uses include spray applications for bridge deck and pavement protective layer with fabrics. PG64-28 is generally used for the locations with low elevation.

PG70-22 is primarily used in areas with high traffic volume and is also the paving asphalt cement used for the production of Hot Mix Asphalt (HMA). This grade is also a good choice for sealing the edges of pavement and for crack sealing.

PG Grades with the best resistance in thermal cracking

PG 64 -22
PG 76 -22
PG 64 -28
PG 58 -34

PG Grades with the best resistance against rutting

PG 82 -22
PG 76 -28
PG 70 -28
PG 76 -22

Common in toll roads (high Volume)

PG 64-22

Common in toll booth (high volume and slow traffic)

PG 70-22

Common in the rest area (high volume and standing traffic)

PG 76-22

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