Abstract
The mechanical properties of alkali-activated binders based on blends of tungsten mining waste mud (TMWM) and electric arc furnace slag (EAF-S) were investigated. The synthesis of alkali-activated binders was conducted at 60°C for 24 h with different TMWM/EAF-Slag ratios (90:10, 80:20, 70:30, 60:40, and 50:50 vt.%). Using sodium hydroxide (SH) and sodium silicate (SS) solutions as alkaline activators with ratio solid/liquid 4 by unit of volume, and the sodium silicate to NaOH (SS:SH) ratio of 2:1. The X-ray Diffraction (XRD), mercury intrusion porosimetry (MIP) were determined. The different percentages of the precursors and the alkaline activators were optimised to produce paste samples. The compressive strength of samples with 10 vt.% EAF-Slag was close to 20.7 MPa after 90 curing days. The mechanical properties were further increased up to 30 MPa by increasing the percentage of EAF-Slag to 50 vt.%. This demonstrates a new potential for re-using waste material for various constructional applications.
Highlights
The use of slags in environmental applications were found to be eco-friendly as it does not possess any hazard to the health of people
The results show that porosities of the samples were different and changed with the change in the amounts of EAF-Slag added to the mixtures, the porosity measured varied from approximately 46.5% for the EAFS01TM09 paste cured for 90 days to 20.4% for the EAFS05TM05 paste cured for 90 days (Fig. 3a, Table. 3)
➢ The compressive strength of the AABs increase with the increasing in the amount of the EAFSlag, the compressive strength developed by the time of cure
Summary
The use of slags in environmental applications were found to be eco-friendly as it does not possess any hazard to the health of people. The waste generated from mining and quarry industry accumulated in large deposits present a potential risk of environmental pollution and cause serious landscape impacts. Pacheco-Torgal et al [12] in their initial study obtained alkali-activated materials using tungsten mine mud waste (TMWM) mixed with minor quantities of calcium hydroxide, sodium hydroxide and waterglass solutions. For this combination, they obtained an alkali-activated concrete compressive strength of fc(56) = 65.3 MPa at 56 days curing. Kastiukas et al [13] obtained a new alkali-activated binder where 20% of the tungsten mining waste was replaced by milled glass powder to increase the overall SiO2 content. The compressive strengths and microstructural of several alkali-activated TMWM and EAF-Slag mixtures have been carried out. The final aim of this experimental study is to determine the optimum percentage of EAF-Slag to obtain a binder with the best mechanical performances
Sign-in/Register to view highlights & summary 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.
