The paper provides background on the Hanbar concrete armour unit which has been used since late 70s in Australia and more recently in New-Zealand. Guidelines for installation, including placement density and damaged coefficient, based on over physical modelling and field installation on over a dozen breakwaters are presented. The paper concludes with two recent case studies which have successfully capitalized on the economical, robustness and manufacturing simplicity of the Hanbar concrete units. The first study details the integrated physical modelling (2D and 3D at scale 1:40) for the Ōpōtiki Harbour Development in New Zealand. The second study provides an update on laboratory and field trials of high-density geopolymer concrete Hanbars units.
