Title: Mixture Proportions of Concrete with Dredging Sediments as Novel SCM

Author(s): Céline Van Bunderen, Ruben Snellings, Liesbeth Horckmans, Lucie Vandewalle, Özlem Cizer

Publication: Symposium Paper

Volume: 320

Issue:

Appears on pages(s): 27.1-27.10

Keywords: calcined dredging sediments; fresh concrete properties; mechanical parameters; mixture proportions; pozzolanic reactivity; superplasticizer; supplementary cementitious material; w/cm

DOI: 10.14359/51701065

Date: 8/1/2017

Abstract:
Maintenance dredging works in the port of Antwerp generate each year about 450,000 tons [408,240 metric tons] of dry matter of dredging sediments, for which suitable disposal solutions or applications are required. Mechanical dewatering of the sediments results in dewatered filter cakes, rich in clay minerals. When flash calcination is applied to activate the clay minerals, the sediments show pozzolanic properties superior to siliceous fly ash. Replacing 30 wt.% of cement by dredging sediments leads to a strength development equivalent to that of a reference mixture with normal portland cement at 28 and 90 days, as a result of pozzolanic reactions. Therefore, calcined dredging sediments have a great potential to be used as a novel supplementary cementitious material (SCM) for the production of sustainable cement and concrete. This paper presents concrete mixture proportions, compatibility of the dredging sediments with different types of superplasticizers and examines both fresh and hardened concrete properties.