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Dredging activities play an important role in maintaining and improving navigation in ports and harbours. In Antwerp port, Belgium, each year about 450.000 tons dry matter dredging material is generated and suitable applications are required. After a mechanical dewatering and flash calcination, the dredging sediments show pozzolanic properties and therefore have great potential to be used as novel supplementary cementitious material (SCM). This paper aims to assess the influence of the calcined dredging sediments on the autogenous deformation. The results indicate that the dredging sediments act as an SCM that typically decreases autogenous shrinkage and so reduces the cracking risk of concrete at early age, hereby improving concrete durability.