Australia’s first Light Weight Deflectometer (LWD) standard released

Nov 9, 2020 | Bearing Capacity, Compaction Control, Rail Formation & Ballast Condition Assessment

We are very happy to let you know that Australia now has it’s own Light Weight Deflectometer (LWD) standard.

Test Method Q726B: Deflections – Portable Impulse Plate Load Test Device

Our Zorn LWDs are fully compliant with Q726B.

The standard has been developed by Department of Transport and Main Roads Queensland (DTMR) and is based on the ASTM E2835: Standard Test Method for Measuring Deflections using a Portable Impulse Plate Load Test Device.

The standard is one of the outcomes of the “Best practice in compaction quality assurance for pavement and subgrade materials – P60” National Asset Centre of Excellence (NACOE) project carried by Queensland Department of Transport and Main Roads (DTMR) and the Australian Road Research Board (ARRB). To find out more about this project, we have brought all the reports, presentations and webinars into one place.

Modulus is the most accurate and independent means for judging deformation (stiffness) and, thus, a materials level of compaction. Modern geotechnical and pavement designs are based on in-situ modulus values.

However, the traditional state of practice is to base the field-testing parameter selection on the result of a non-deformation parameter, such as DCP or CBR results from site investigation or density/moisture relationships in earthworks QA.

This means that there is currently a disconnect between design and construction control.

The Light Weight Deflectometer (LWD) addresses this gap and Queensland DTMR have recognised this.

By measuring the modulus value, the LWD provides the direct link between the design specification (design modulus value) and the actual site condition (in-situ modulus value).

The LWD enables one to:

(a) reliably provide a direct measure of the strength or insitu modulus value; and

(b) offers significant time savings in turnaround time of QA test results.

We believe this is major step forward in pavement construction and are privileged to have been playing our role in this transformation over the last 15 years taking deflection based testing from the early adopter phase to more main stream adoption in Australia, New Zealand and the Pacific Islands. 

We are very appreciative of all those who have encouraged us along the way including our fabulous clients. Thank you!

I felt the training was very thorough. If anyone doesn’t know how to use a PANDA after that session, they shouldn’t be using one at all.

Sam Bamford

Laboratory Division Manager, Protest Engineering

Insitutek imports, sells and services, unique geotech equipment that has proved of great benefit to those who use it. It has a particularly beneficial role to play for those compacting soil in infrastructure projects.

David Palmer

Earthmover and Civil Contractor

Since hiring the LWD I have used it on numerous jobs in a wide variety of material types all over WA. The ability to give “real time” test results have worked particularly well for me as i can show my clients numerical values which gives them a direct understanding of some of the benefits using Betta Roads has brought to their road construction projects. The feedback I have been receiving over the last few months has lead me to purchase the LWD and incorporate its use as an integral part of our projects.

Paul Bright

Director at Betta Roads Pty Ltd Perth Area, Australia



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