Pavement Layer Compaction Update (covering NZTA T24 and T28)

Presented by Rob Damhuis, NZTA Waka Kotahi

19 June 2025 

Pavement layer compaction – Laboratory to construction
Since the 2020 pavement performance review, NZTA has been working hard with industry to improve our practices in materials testing and characterisation, pavement design, and construction specification. The result of this has been the recent release of T24 and T28, and the changeover to NDM Direct Transmission for compliance testing.
This short webinar will provide a brief overview of compaction theory, and some background to the two new test methods.
 

Rob Damhuis Bio
Rob is a practical, innovative and resourceful pavements SME with considerable knowledge of the road industry gained over 40 years’ experience in various aspects of road design and construction.
He is a Principal Pavement Engineer in the Engineering Standards Team at NZTA. His role is a national one, covering reviewing and auditing pavement design and construction and updating Standards and specifications. He is champion for the review and rewrite of the Pavement Design Guidelines as a Pavement Design Standard.
He has a Higher Diploma in Civil Engineering Materials Testing, and a Bachelor of Technology in Geotechnical Engineering. In his career Rob has fulfilled various management roles around South Africa, Australia and New Zealand in pavement design, materials laboratories, quality assurance, contract and construction management, geotechnical engineering, and asset management.

Link to cloud recording. Passcode: 56rJ?A@Q