Xbloc - Effective ware protection for breakwaters and shores

Cotonou, Benin

To counteract coastal erosion, new groynes will be constructed east of the port of Cotonou, Benin. Both Xbloc armoured and rock armoured groynes will be applied. The design has been done by Roche from Canada. Construction is done by Boskalis. The Xbloc project in Cotonou is the fifth project where Boskalis is involved in the placement of Xbloc armour units.

The Xbloc groynes will have a main armour of 4 m3 Xblocs. The moulds of the Xbloc project at Pointe Noire will be re-used. 3D physical model testing has been carried out at LEM in Algiers, Tunisia.


Start of casting: January 2013
Start of placement:  February 2013
1/5 Xbloc groynes is completed:  April 2013
2/5 Xbloc groynes is completed: July 2013
3/5 Xbloc groynes is completed: November 2013
4/5 Xbloc groynes is completed December 2013
Production of Xblocs is completed: December 2013
Project completed: April 2014

Project Details

Hs: 3.5 m
Number of Groynes:   5
Size of Xblocs: 4m3
Number of units: 2,000
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