Especially in Holland these tropical hardwood beams are used to prevent boats hitting bridges and the sides of canals. After about 25 years they have to be replaced. So they can be found at companies replacing them, in harbors and anywhere near big waterworks.
Basra locus tropical hardwood
It weighs about 800 kg /m3
It turns grey in the sunshine but the original color is red brown
The original new posts measure about 15 meters and have a section of 40/40 cm.
To reuse the generally rotten top of 3 m is cut of and the rough outside is sew of leaving a section of 35/35 cm
The planks that are cut of are usually cut of into 3m lengths, and have one rough side.
They have been cut to little pieces and used as cladding for a building by opmaat architects
http://www.opmaat.info/ click on projecten/rgd terneuzen
Or see how Mille Gommes Jan Korbes cut them into lego-blocks and built a wall from it:
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this entry was made possibe thanks to a contribution by the netherlands foundation for visual arts, design, and architecture