R23.1 This specification sets out the requirements for the subgrade zone in excavations and on embankments. It applies to new roadwork construction and to works on existing road pavements where the works involve the exposure of, or the construction of, the subgrade zone and pavement. The provisions of this specification cover: the quality requirements of imported materials used to construct the subgrade zone on embankments, and in cut and the exposed subgrade under an existing road pavement where excavation and replacement of the subgrade is judged to be required methods of assessment of the condition and compliance of exposed subgrade zone materials in cut and below existing pavements, including the representative Insitu CBR and proof rolling procedures construction of the subgrade zone including remedial treatments for exposed subgrade zones in cut, compaction, dimensions and shape tolerances evidence of compliance measurement and payment hold points. R23.2 The objective is to provide a subgrade zone that meets or exceeds the requirements of the pavement design to assist in achieving a stable, durable pavement. R23.3 Subgrade construction shall be compatible with the provisions of all DIER standard specifications for Design, Construction and Maintenance in particular: G1 - General Provision G2 - Contract Management Plan G3 - Traffic Management G4 - Compaction Assessment G6 - Production of Aggregate and Rock Products G9 - Product Quality G8 - Construction Survey R22 - Earthworks Subgrade construction shall also be compatible with a number of Australian Standards and Austroads Guides: Australian Standards AS 1348 Road and Traffic Engineering Glossary of Terms – – AS 1289.6 Methods for Testing Soils for Engineering Purposes. – Austroads Guide to Pavement Technology Part 2 Pavement Structural Design – Part 4 – Pavement Materials Part 4I Earthworks Materials – Part 5 Pavement Evaluation and Treatment Design. – Further to the documents referred to in Clause References and Standards the following definitions shall apply: Formation - the surface of the finished earthworks, excluding cut and fill batters. Note: the location of the formation relative to the subgrade is different for pavements constructed in cut and fill.
R23.1 This specification sets out the requirements for the subgrade zone in excavations and on embankments. It applies to new roadwork construction and to works on existing road pavements where the works involve the exposure of, or the construction of, the subgrade zone and pavement. The provisions of this specification cover: the quality requirements of imported materials used to construct the subgrade zone on embankments, and in cut and the exposed subgrade under an existing road pavement where excavation and replacement of the subgrade is judged to be required methods of assessment of the condition and compliance of exposed subgrade zone materials in cut and below existing pavements, including the representative Insitu CBR and proof rolling procedures construction of the subgrade zone including remedial treatments for exposed subgrade zones in cut, compaction, dimensions and shape tolerances evidence of compliance measurement and payment hold points. R23.2 The objective is to provide a subgrade zone that meets or exceeds the requirements of the pavement design to assist in achieving a stable, durable pavement. Subgrade construction shall be compatible with the provisions of all DIER standard specifications for Design, Construction and Maintenance in particular: G1 - General Provision G2 - Contract Management Plan G3 - Traffic Management G4 - Compaction Assessment G6 - Production of Aggregate and Rock Products G9 - Product Quality G8 - Construction Survey R22 - Earthworks Subgrade construction shall also be compatible with a number of Australian Standards and Austroads Guides: Australian Standards AS 1348 – Road and Traffic Engineering – Glossary of Terms AS 1289.6 – Methods for Testing Soils for Engineering Purposes. Austroads Guide to Pavement Technology Part 2 – Pavement Structural Design Part 4 – Pavement Materials Part 4I – Earthworks Materials Part 5 – Pavement Evaluation and Treatment Design. Further to the documents referred to in Clause R23.3 References and Standards the following definitions shall apply: Formation - the surface of the finished earthworks, excluding cut and fill batters. Note: the location of the formation relative to the subgrade is different for pavements constructed in cut and fill.
R23_Subgrade_Zone_June_2013.docx