Hydration of Cement Blended with Flash-calcined Dredging Sediments

Author(s): Ruben Snellings1, Liesbeth Horckmans1, Céline Van Bunderen2, Lucie Vandewalle2, Koenraad Van Balen2, Joris Dockx3, Jonas Marlijn3, Jos Vandekeybus4 and Özlem Cizer2
Paper category: Proceedings
Book title: Proceedings of the 71st RILEM Annual Week & ICACMS 2017,Chennai,India, 3rd -8th September 2017
Editor(s): Manu Santhanam
Ravindra Gettu
Radhakrishna G. Pillai
Sunitha K. Nayar
ISBN: 978-2-35158-196-4
ISBN: 978-2-35158-190-2 (Set)
e-ISBN: 978-2-35158-191-9:
Publisher: Published by RILEM Publications S.A.R.L.
Publication year: 2017
Pages: 52-59
Total Pages: 8
Language : English

Abstract: In Europe alone, it is estimated that about 300 million tonnes of sediments need to be dredged
each year. The dredged sediments used in this study originate from the port of Antwerp,
Belgium, which is the second largest port in Europe. Each year about 450.000 tonnes (dry
matter) of sediments are dredged and subsequently treated, sand-separated and dewatered in a
state-of-the-art mechanical dewatering plant (AMORAS). Large volume applications for the
dewatered sediments are currently being investigated. This contribution describes the results
of a hydration study of cement blended with flash-calcined sediments.
Calorimetry data show that the hydration of the blended cement is slightly accelerated
and that the reaction of the clinker fraction is enhanced at early ages. This is clearly due to a
filler effect of the calcined dredging sediments. At 3-7 days a clear contribution of the
pozzolanic reaction is observed. The pozzolanic reaction consumed portlandite and produced
additional ettringite and AFm phases. The pozzolanic reaction thus contributed to an
increased binding of water and reduction of porosity in the blended cements, which is
believed to be the main reason for the additional strength development observed in the mortar
bar tests

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