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This specification shall apply to the in-situ stabilisation of subgrade layers comprising either natural in situ soils, imported fill materials or a combination of both using cement, lime or a combination of these. 

The subgrade layer(s) shall be constructed in accordance with the levels, grades and cross-sections shown in the drawings of the Project Specifications. 

Before using the in-situ stabilisation specifications, the user needs to be aware of the aim of the stabilisation activity to understand what the stabilisation activity is intended to achieve. This specification covers subgrade stabilisation, aiming at reducing moisture content, reducing water susceptibility; provide a homogeneous substrate for overlying pavement layers and to increase the shear strength of the material being treated.

The other in-situ stabilisation specifications are:

• Stabilisation of modified pavement layers (TNZ B/5: 2008)
• Stabilisation of strongly bound pavement layers (NZTA B/6: 2010)

This document outlines the NZ Transport Agency's prequalification for physical works process.

See technical advice note:
TAN #20-02 Pilot specification for in-situ subgrade stabilisation