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AS/NZS 2891.14.2:1999
Methods of sampling and testing asphalt - Field density tests - Determination of field density of compacted asphalt using a nuclear thin-layer density gauge


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Document Type Standard
Status Superseded
Publisher:    Standards Australia
Committee CE-006
Superseded By:
AS/NZS 2891.14.2:2013
Supersedes:
DR 94089



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Scope

This Standard sets out the method for determining the field density of thin layers of asphalt using a nuclear thin- layer density gauge with two backscatter modes of operation or geometries. The gauge simultaneously determines, by the independent backscatter geometries, two values of gross mass per unit volume. The density of the top layer of asphalt of selected thickness is estimated by mathematically eliminating the influence from the underlying layer(s).
The method is applicable to asphalt layers between 25 mm and 100 mm thick and to asphalts having a nominal maximum size not greater than 40 mm.
The method does not detail the operation of the gauge but refers the operator to the manufacturer's handbook.
When nuclear gauges are used for density measurement, the quantity of material being assessed is not precisely known. However, reference to the manufacturer's handbook and to current literature may indicate the likely volume.
A nuclear gauge gives an indirect measure of field density and, hence, requires calibration, in accordance with AS/NZS 2891.14.3. Regular checks on the operation and the calibration of the gauge are also required (see Appendix A). A density offset is determined for each material being tested (see Appendix B).

History

First published as AS/NZS 2891.14.2:1999.

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