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The T23 method for the estimation of the density of compacted aggregate layers by direct transmission is used to quantify the vertical uniformity of aggregate compacted in a pavement layer. It is particularly applicable to aggregates stabilised in-situ in accordance with NZTA B05 specification.

The areas covered by the method include:

• apparatus required
• testing procedure
• calculation of the estimated density for subsurface layers
• reporting requirements.

T23 is a new specification.

Related information
In-situ stabilisation of modified pavement layers specification (2008)