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Decomposed Granite is permeable, allowing water to pass through the material. Due to the particle characteristics of DG, the permeability may be significantly decreased and California Bearing Ratio significantly increased with increasing compaction effort where the particle size is decreased.
The applications of the DG material may be increased through the addition of Ordinary Portland Cement or low carbon binder alternatives such as Hydrated Lime, Ground-granulated blast-furnace slag (Independent Cement), Fly Ash (Cement Australia) and tall oil (SoilBond).
Geotechnical test results summary - Wootong Vale Weathered Granite Gravel
Geotechnical laboratory testing completed on weathered granite gravel samples obtained direct from the quarry stockpiles indicate that the material is suitable for surface, shoulder, base and sub-base road building pavement layers for several road classes. Austroads Guide to Pavement Technology Part 4A: Granular Base and Subbase Materials provides a guide to geotechnical properties test limits for natural gravels (refer Appendix C) for base and subbase materials for sealed and unsealed roads.
Based on performance at many locations in the Coleraine and surrounding area from roads constructed by the local Council and contractors the material has proven to be suitable for road making (including base course).
The Wootong Vale granite gravel material is used for the construction of the following roads —
McKebery Street between Winter and Gage Streets
Gage Street between McConochie and McKebery Streets
Read Street between Whyte and Trangmar Streets
Henty Street between McLeod and Trangmar Streets
Turnbull Street between Winter and Read Streets
The gravel has also been used for the maintenance and/or construction of sections of the following roads —
Natimuk-Hamilton Road
6 Mile Lane
Top Hilgay Road
Tulse Hill Settlement Road, Carapook
To prove the full performance of the material in-situ testing is required during construction and prior to use to guarantee specific requirements are met. The performance of the weathered granite gravel material is subject to adequate drainage design, construction methods, and road pavement design. The laboratory test samples for test results provided here were from stockpiles at the Wootong Vale quarry at that time. As the gravel is a naturally occurring material extracted from the gravel pits, the material attributes may vary from time to time, and therefore the geotechnical variables need to be verified through further geotechnical testing for material supplied for a project. The color of the gravel will vary depending on moisture content (ie. lighter appearance when dry).
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