DEFINITIONS

Stone mastic asphalt is defined as a gap-graded asphalt mixture that has bitumen as a binder, and is composed of a coarse crushed aggregate skeleton bound with a mastic mortar.

The standard defines two types of recipes (job mix formulae [JMF]):

• Input target composition—this is the determined composition of the mix­ture given through listing its constituent materials, the gradation curve, and the percentage content of binder added to the mixture; this formula is the result of laboratory validation of the mixture.

• Output target composition—this is the determined composition of the mixture given through listing its constituent materials, the midpoint grada­tion, and the percentage of soluble binder content in the mixture, which are obtained as results of the composition analysis (extraction) of a produced mixture; usually this formula is the result of production validation of the mixture.

An additive is defined as a constituent material supplemented to the mixture in small amounts, (e. g., organic or nonorganic fibers and polymers added to enhance mechan­ical properties, workability, or the color of the mixture).

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