Abstract
Few studies focus on the co-valorization of river dredging sediments (DS) and residual waste glass (RWG) in alkali-activated binders. This study investigates the use of DS as an aluminosilicate source by substituting a natural resource (metakaolin (MK)), while using RWG as an activator (sodium silicate source). Suitable treatments are selected to increase the potential reactivity of each residue. The DS is thermally treated at 750 °C to promote limestone and aluminosilicate clays’ activation. The RWG (amorphous, rich in silicon, and containing sodium) is used as an alkaline activator after treatment in 10 M NaOH. Structural monitoring using nuclear magnetic resonance (29NMR and 27NMR), X-ray diffraction, and leaching is conducted to achieve processing optimization. In the second stage, mortars were prepared and characterized by determining compressive strength, water absorption, mercury porosimetry and Scanning Electron Microscopy with Energy Dispersive Spectroscopy (SEM-EDS). Results obtained show the great advantage of combining RWG and DS in an alkali-activation binder. The treated RWG offers advantages when used as sodium silicate activating solution, while the substitution of MK by calcined sediments (DS-750 °C) at 10%, 20%, and 30% leads to improvements in the properties of the matrix such as an increase in compressive strength and a refinement and reduction of the pore size within the matrix.
Highlights
Global warming and overexploitation of natural resources are concerning issues for the future
According to the chemical nature of this material, it is possible that other phases are present but difficult to detect under the effect of strong crystallinity and the strong presence of quartz
This work shows the possibility of the binary valorization of residual waste glass (RWG) and dredging sediments (DS) for use as an alkali-activated binder
Summary
Global warming and overexploitation of natural resources are concerning issues for the future. Several studies focus on the insertion of different types of solid waste into construction materials (such as sediments, fly ash, glass, bottom ash, silica fume, and slag) and on the reduction in the quantity of cement. Ecological binders such as geopolymers and alkali-activated materials (which do not have the same hardening mechanism as Portland binders) have received increasing interest. The term geopolymers was coined by Davidovits (1978) [1] and refers to inorganic polymers with an aluminosilicate backbone. Some studies refer to these polymers as polysialate [1] and (N/K)-A-S-H type gel [3]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
