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5. Main characteristics of road bitumen
5.1 Needle penetration (EN 1426)
Needle penetration is the depth of penetration, expressed in tenths of a millimeter, of a standardized 1 mm diameter needle, under a 100 g load, applied for 5 s to a bitumen sample maintained at 25°C (figure 3 ).
Penetrability is one of the two fundamental characteristics that define a bitumen.
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Main characteristics of road bitumen
Fluidified and fluxed bitumens
References
Organizations
The bibliographical references relating to bitumens and bituminous binders are extremely numerous and cannot be grouped together in a single work. For this reason, readers are invited to consult the sites listed below:
• Oil Standards Bureau (BNPé)
• French Petroleum Institute (IFP)...
Standards
Specific standards are mentioned in the text. Here, the reader will find a summary of the specification standards and general test methods that apply upstream of the specific methods. The latter must be included in the specification standards which use them.
To keep the text as short as possible, the titles of the standards listed below have been kept to a strict minimum. As a general rule, only the...
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