PROPERTIES OF CONCRETE RECYCLING CLAY-RICH DREDGING SEDIMENTS AS A NOVEL SUPPLEMENTARY CEMENTITIOUS MATERIAL

Author(s): Céline Van Bunderen, Ruben Snellings, Liesbeth Horckmans, Joris Dockx, Jos Vandekeybus, Koenraad Van Balen, Lucie Vandewalle, Özlem Cizer
Paper category: Proceedings
Book title: proceedings of the International RILEM Conference on Materials, Systems and Structures in Civil Engineering Conference segment on Service Life of Cement-Based Materials and Structures
Editor(s): Miguel Azenha, Ivan Gabrijel, Dirk Schlicke, Terje Kanstad and Ole Mejlhede Jensen
ISBN:978-2-35158-170-4
e-ISBN: 978-2-35158-173-5
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 334-341
Total Pages: 8
Language : English

Abstract: Treated dredging sediments of the port of Antwerp are rich in clays (2:1 clays and kaolinite)
and contain relatively low contents of sulfur and chloride. When flash calcination is applied to
activate the clay minerals and to reduce the total organic content, the sediments show
pozzolanic properties superior to siliceous fly ash. This paper investigates the applicability of
the calcined dredging sediments as a supplementary cementitious material replacing Portland
cement in concrete, and evaluates the basic properties of fresh and hardened concrete in
comparison with two reference concrete mixes composed of Portland cement and Portland fly
ash cement. When cement is replaced at 20, 30 and 40 wt.% ratios by dredging sediments,
compressive and flexural strength values of concrete at 7 days decrease respectively. Low
early strength is, on the other hand, compensated by the pozzolanic reactions taking place up
to 28 days when the strength of blended concrete compositions reaches that of the reference
Portland cement concrete. The initial results clearly indicate that flash-calcined clay-rich
dredging sediments can potentially be used as a new pozzolanic supplementary cementitious
material in concrete.

Online publication : 2016
Publication type : full_text
Public price (Euros) : 0.00