In this article, you’ll find practical guidance on moving from a density based specification for compaction control to a modulus based approach to testing in the field.
The Best practice in compaction quality assurance for pavement and subgrade materials – P60 project final report has been released by National Asset Centre of Excellence (NACOE), a collaboration of Queensland Department of Transport and Main Roads and the Australian Road Research Board (ARRB).
Importantly, in Appendix A of this report, is the Draft Technical Note – Guidance on Use of Light Weight Falling Deflectometers (LWDs) to be Accepted as an Alternative Method for Verification of Earthworks Compaction Requirements – June 2021. This provides guidance on moving from a density based specification for compaction control to a modulus based approach to testing in the field.
This draft technical note provides guidance on implementation of Light Weight Deflectometers including a flow chart showing key steps for assessment/derivation of equivalent acceptance thresholds for LWD use (in lieu of traditional (density) testing minimum thresholds included in MRTS04 – General Earthworks).
We believe this “How to” guide will be very useful for industry on projects across the country.
You can also access all the Best practice in compaction quality assurance for pavement and subgrade materials – P60 project findings and learn more about why is there a shift from density to modulus based testing.
If you have any feedback and thoughts on the Draft Technical Note, we’d love to hear them! Contact us.
