Early-Age Properties of Flash-Calcined Dredging Sediment Blended Cements

Author(s): C. Van Bunderen, R. Snellings, L. Horckmans, L. Vandewalle and Ö. Cizer
Paper category: Proceedings
Book title: Proceeding of the 71st RILEM Annual Week & ICACMS 2017
Editor(s): Manu Santhanam, Ravindra Gettu, Radhakrishna G. Pillai, Sunitha K. Nayar
ISBN:978-2-35158-195-7, 978-2-35158-190-2 (Set)
e-ISBN: 978-2-35158-191-9
Publisher: RILEM Publications SARL
Publication year: 2017
Pages: 81-88
Total Pages: 9
Language : English

Abstract: A novel SCM used in this study originates from the dredging sediments of the port of Antwerp in Belgium. Annually about 450.000 tonnes dry matter base of sediments are dredged and treated by mechanical dewatering with membrane filter presses. These treated dredging sediments are rich in clays (2:1 clays and kaolinite) and contain relatively low contents of sulfur and chloride. Flash calcination was performed to activate the clay minerals and to reduce the total organic content. The flash-calcined dredging sediments show pozzolanic properties superior to siliceous fly ash. 30 wt. % cement replacement by calcined sediments results in mechanical strength
development, which is equivalent to Portland fly ash cement concrete.
This paper aims to assess the effect of flash-calcined dredging sediments on the early-age properties of cement paste in order to understand its early-age deformation potential. In particular, prediction of the autogenous deformation of such SCM blended cements remains of major importance for concrete performance. Parameters such as hydration reactions, setting and hardening, and autogenous shrinkage behaviour are studied. The results allow understanding the effect of flash - calcined dredging sediments on the early age behaviour, and also the complex issue of the autogenous deformation which is the combination of various combined mechanisms.

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