Test Methods and Specifications
Dry Deep Soil Mixing
- Publication no: ATS-2180-25
- Published: 9 December 2025
- Edition: 1.0
- PDF (free) Download
Austroads Technical Specification ATS 2180 sets out the requirements for ground improvement by deep soil mixing (DSM) using the dry mixing method.
DSM is undertaken by the following process:
- a) penetration of a special mixing tool into the ground to the required depth of treatment;
- b) injecting the Binder (as a dry powder) through the tip of the tool via compressed air; and
- c) mixing the Binder and soil by mechanical means to cause disaggregation of the soil and thorough mixing with the Binder to form a column.
This technical specification can also be downloaded as a Word document.
- 1. Scope
- 2. Referenced Documents
- 3. Definitions
- 4. Quality System Requirements
- 5. Site Investigation and Preliminary Testing
- General
- Lot Identification and Location
- Test Areas Within Lots
- 6. Materials
- 7. Plant and Equipment
- 8. Site Preparation and Management
- General
- 9. Construction – General
- Quality Plan
- Column Position and Dimension
- Control and Monitoring
- Ground/Column Heave and Lateral Displacement
- Construction Records
- 10. Trial Columns
- Field Trial Mixing Parameters
- Construction of the Trial Columns
- Testing of the Trial Columns
- Acceptance of Trial Columns
- 11. Production Columns
- 12. Testing of the DSM Columns
- 13. Conformity Requirements
- Acceptance Criteria
- Treatment of Nonconformity
- 14. Completion of the DSM Columns
- Annexure A Summary of Hold Points, Witness Points and Records
- Annexure B Test Method to Determine UCS and 50% UCS Secant Modulus
- Annexure C Test Method for Concrete Compressive Strength Using Cores
- Annexure D Column Pull Out Resistance Test (PORT) and Push In Resistance Test (PIRT)
- D.1 Vane Equipment Details
- D.2 Testing Procedure – PORT
- D.3 Testing Procedure – PIRT
- D.4 Submission of Test Results
- Annexure E Column Head Exposure Test
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