Standards Development

Scope

This document specifies the methods for compacting parallelepipedal specimens (slabs) of bituminous mixtures, to be used directly for subsequent testing, or from which test specimens are cut.

For a given mass of bituminous mixture, the specimens are prepared either under controlled compaction energy, or until a specified volume and therefore air voids content is obtained.

This document describes the following methods of compaction:

— method using a wheel or two wheels fitted with pneumatic tyres;

— methods using a steel roller, which includes 3 different procedures:

— steel roller;

— steel roller used on wheel fitted with pneumatic tyres;

— steel roller running on vertical sliding steel plates;

— method using a steel roller sector.

This document is applicable to bituminous mixtures manufactured in the laboratory or in a mixing plant.

Purpose

The main purpose for the amendment is:

• Modification of Formula (1) and text in Clause 5.2.1.2, based on scientific information recently identified.

• The amendment of Formula (1) is needed because of the different design of the equation, the different units used and the use of the formula for selecting a suitable roller device, especially according to the required mass (vertical force).