Updating Bituminous Stabilized Materials Guidelines Mix Design Report Phase II

2.2 BSMs for MMLS3 testing
The intention of this study is to validate materials that known to be resistant to moisture
damage and materials known to be susceptible to moisture damage. The Initial study included
validation of crushed Hornfels (G2) material. In the addition study, due to time constraints,
limited test were done on Hornfels (RAP) and Quartzites (G4) materials.
Due to the development of a compaction procedure for BSMs to produce triaxial sized
specimens, see Task 12, this procedure followed for the production of specimens for the MMLS3
tests. The triaxial specimens produced, have dimensions of 300mm high and 150mm in
diameter. By having specimen dimensions and an indication of the density of the material, the
amount of aggregates to mix one specimen is calculated. A mass of 12kg material needed to
make one specimen.
2.2.1 Mixing of the Materials
The initial study tested four different types of BSMs and additional study tested four different
types of materials as indicated in Table J.1. Three materials on the initial study tested after
accelerated laboratory curing. The fourth material selected from Hornfel-RAP with 1% cement
cured for more than 9 months at room temperature. The additional study also tested specimens
after accelerated laboratory curing, more tests are envisage on additional study however results
of only four tested materials were available during final report writing.
Table J.1: Mix type and testing Matrix
Binder type
A - Emulsion
B- Foamed
bitumen
Aggregates type
Initial test
Additional test
Crushed Hornfels (G2) Hornfels-RAP + 2% Quartzite + 2%
+2% residual binder residual binder
residual binder
Mix 1: 0% filler Mix 1: 0% filler Mix 4: 0% filler
Mix 2: 1% cement Mix 2: 1% cement
Mix 3: cured more than Mix 3: 1% lime
9 months
Mix 4: 0% filler
2.2.2 Curing
The curing of the specimens is an essential component on the development of strength within
the mixes before exposure to moisture. In order to carry out curing, the specimen is placed in
an oven just after compaction. Initially, the specimen is placed in the oven for 20 hours
unsealed at a temperature of 30ºC. Without sealing from the dry warm air, the moisture reduces
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