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