Effect of flash-calcined dredging sediments on cement hydration and microstructure

Author(s): Cizer Özlem, Van Bunderen Céline, Vandewalle Luciea, Horckmans Liesbeth, Snellings Ruben
Paper category: Proceedings
Book title: Proceedings of the 2nd International RILEM/COST Conference on Early Age Cracking and Serviceability in Cement-based Materials and Structures Volume 1
Editor(s): Stéphanie Staquet and Dimitrios Aggelis
ISBN:978-2-35158-199-5
e-ISBN:978-2-35158-198-8
Publisher: RILEM Publications SARL
Publication year: 2017
Pages: 55-62
Total Pages: 8
Language: English

Abstract: This study deals with the potential use of treated and calcined dredging sediments from the port of Antwerp as a supplementary cementitious material (SCM). The dredging sediments are composed of mainly SiO2, CaO, Al2O3, Fe2O3, and relatively low contents of sulfur and chloride. Major mineral phases are clays (2:1 clays and kaolinite), quartz, calcite and an amorphous phase. Flash calcination of the sediments at 820, 865 and 905°C resulted in the dehydroxylation of the clay minerals, partial decarbonation of the calcite and reduction in the total organic carbon fraction. The calcined dredging sediments show pozzolanic reactivity superior to that of Class F fly ash. This leads to a gradual increase in compressive strength in blended cement mortars in the long term and densification of the microstructure. Results clearly demonstrate the potential of calcined dredged sediments as a new pozzolanic SCM for the production of low-CO2 blended cements.

Online publication : 2017
Publication type : full_text
Public price (Euros) : 0.00