DIGEST 2006 - Sabita

Completed
early 2006
Phase 1: Inception study
• Obtain available performance data on pavements
incorporating bituminous stabilised materials (BSM);
• Review existing tests and protocols related to mix design
on BSM;
• Formulate approach and detailed planning for Phase 2.
in
Currently
progress
Phase 2: Develop new methods as needed
• Develop pavement design and materials classification
methods based on LTPP and APT data;
• Refine existing laboratory tests and develop new tests as
needed to facilitate mix design and classification of BSM
stability and flexibility.
Completion
in 2008
Phase 3: Compile guidelines
• Incorporate new methods and practices for Mix Design
and Structural Design from Phase 2;
• Review and expand sections related to construction,
materials selection and composition;
• Review and publish.
Figure 2: Structure of the Project
a more fundamental, reliable mix
design method for cold mixes in
general.
The overall framework of TG2 was
found to be well-founded but not
comprehensive, and certain
components to the mix design
procedure were found to be
lacking. In addition, this project
aims to use more explicit mix
design tests to classify the
emulsion and foamed bitumen
mixes for pavement design
purposes. The mix design
component of the study therefore
has four main objectives:
• Investigate the incorporation
of triaxial testing into the mix
design procedure. Shear
parameters reliably define the
performance properties of
cold mixes, but standardised
(simple) procedures need to
be developed to meet the
needs of both research and
commercial laboratory
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