TY - JOUR

T1 - Modeling hydration of mine tailings: Production of hydraulic binders from alkali-activated materials

AU - Blanc, Philippe

AU - Lach, Adeline

AU - Lassin, Arnault

AU - Falah, Mahroo

AU - Obenaus-Emler, Robert

AU - Guignot, Sylvain

PY - 2020/9/9

Y1 - 2020/9/9

N2 - The production of alkali-activated materials and geopolymers from the finer fraction of tailings is being increasingly investigated, as they could be used for building and public works, or to retain heavy metals in a consolidated solid matrix. The present study proposes a Pitzer-based geochemical model to reproduce the alkaline leaching for two mine tailing samples and the polymerization reactions. The model fits the results of the leaching tests quite well over the reaction duration and up to NaOH 10 M and 60 °C. Discrepancy for the dissolved Mg concentration indicates that the database can handle ionic strength up to 5 mol.kg−1. A geopolymer solid solution was developed for setting reactions modeling. The results compare favorably with compressive strength tests results, with C-S-H, M-S-H and geopolymers as the main hydration products. The study proposes an innovative application of Pitzer database developments with application to the mining industry.

AB - The production of alkali-activated materials and geopolymers from the finer fraction of tailings is being increasingly investigated, as they could be used for building and public works, or to retain heavy metals in a consolidated solid matrix. The present study proposes a Pitzer-based geochemical model to reproduce the alkaline leaching for two mine tailing samples and the polymerization reactions. The model fits the results of the leaching tests quite well over the reaction duration and up to NaOH 10 M and 60 °C. Discrepancy for the dissolved Mg concentration indicates that the database can handle ionic strength up to 5 mol.kg−1. A geopolymer solid solution was developed for setting reactions modeling. The results compare favorably with compressive strength tests results, with C-S-H, M-S-H and geopolymers as the main hydration products. The study proposes an innovative application of Pitzer database developments with application to the mining industry.

U2 - 10.1016/j.cemconres.2020.106216

DO - 10.1016/j.cemconres.2020.106216

M3 - Article

VL - 137.2020

JO - Cement and concrete research

JF - Cement and concrete research

SN - 0008-8846

IS - November

M1 - 106216

ER -