Report on Road Condition
Polycom Dry Powder Polymer Trials on

This report presents the pavement condition on the road sections where field trials of POLYCOM Dry Powder Polymer Stabiliser were conducted on the west bound heavy vehicle traffic lane on the Port W akefield to W allaroo Road near Kulpara. The trials were conducted in March 2003 and April 2003 to determine the saving of water used in compaction of road building materials used at the following site locations

• Trial Section 1 CH2040 – CH2070
• Trial Section 2 CH1360 – CH1395
• Trial Sections 3 & 4 CH340 – CH380
Adjacent areas with no POLYCOM added to the water were also included for comparison

Trial Section 1
Trial Section 1 on the west bound lane adopted a low moisture regime targeting
2.75% moisture content addition with a dosage rate of 1kg POLYCOM per 6000 litres mixed with the 30mm crushed rock basecourse. Optimum Moisture Content (OMC) was 6.0% to 6.6%.
Actual moisture content in the trial achieved only 3.0% - 3.5% or approximately 50% OMC and the resulting low densities (86.5% - 94.5%) were to be expected. Rolling was achieved using a 19 tonne steel drum roller in static mode and a 35 tonne pneumatic tyred roller which also contributed to the low density results. De- compaction was noted beyond 8 passes of the steel drum roller.
Re-working of this section to achieve specified density of 98% Relative Modified Compaction (RMC) is not documented, but is likely to have occurred as this work was completed under contract with tight specification control.
Trial Section 2
Trial Section 2 adopted a target moisture addition of 3.25% with a dosage rate of 1kg per 3500 litres of water.
Actual moisture content achieved was 4.7% (80% OMC) and densities achieved were 96.5% - 99.5% using the 19 tonne roller in vibratory mode followed by the 35 tonne pneumatic tyred roller. Density specification requirements of 98% RMC were met.

Trial Sections 3 & 4
Trial Section 3 was conducted on the 40mm sub-base layer and adopted a target moisture addition of 4.5% moisture addition, again with dosage rate of 1kg to 3500 litres of water

Actual moisture content achieved was 7.4% and densities achieved were 100.0% - 103.5% using the 19 tonne roller in vibratory mode. Following rolling with the 35 tonne pneumatic tyred roller and construction traffic Density increased to 102.5% - 105.5%. Density specification requirements of 98% RMC were exceeded. Trial Section 4 was conducted on the 30mm crushed rock layer over the 40mm layer in Trial Section 3. Moisture was increased to 6.7% (OMC 6.4%) and compaction densities of 100% minimum were achieved using a 19 tonne steel drum vibratory roller followed by the 35 tonne pneumatic tyre roller for static surface compaction.

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Mark Allingham, Operations Engineer Alpine Shire Council

Rural regional alpine roads have special conditions related to their Geographic isolation. These areas are also prone to sever weather variations & conditions as well as high seasonal, intermittent use. The distance to quarry and material sources creates inefficiencies and has been exacerbated by the closure of Parks Vic/DSE pits and material sources within national park areas. The high environmental value of region limits materials and methodologies as well as water sources and restrictions to access “off road” water sources. Alpine Shire council has taken an innovative approach in its road management procedures based on modernised practices and material use.

Geographic isolation Due to the nature of the natural topography of alpine terrain isolation of sites is a normal occurrence. While sites may be spatially close distance between sites can be vast. Valley roads are of a herringbone or tree nature rather than a grid that exists within the plains below the alpine ranges. The geographic nature of alpine areas is not only influencing the relationship between the location of resources in labour and machinery and the area of operations (works site).

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