University of Oulu

Srivastava, S., Jacklin, R., Snellings, R., Barker, R., Spooren, J., & Cool, P. (2022). Experiments and modelling to understand FeCO3 cement formation mechanism: Time-evolution of CO2-species, dissolved-Fe, and pH during CO2-induced dissolution of Fe(0). Construction and Building Materials, 345, 128281.

Experiments and modelling to understand FeCO3 cement formation mechanism : time-evolution of CO2-species, dissolved-Fe, and pH during CO2-induced dissolution of Fe(0)

Saved in:
Author: Srivastava, Sumit1,2,3; Jacklin, Rob4; Snellings, Ruben1;
Organizations: 1Sustainable Materials Management, Flemish Institute of Technological Research (VITO), Boeretang 200, B-2400 Mol, Belgium
2Laboratory of Adsorption and Catalysis, Dept. of Chemistry, University of Antwerp, B-2610 Wilrijk, Belgium
3Fibre and Particle Engineering Research Unit, University of Oulu, Oulu 90014, Finland
4Institute of Functional Surfaces, School of Mechanical Engineering, University of Leeds, Leeds LS2 9JT, UK
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 3.7 MB)
Persistent link:
Language: English
Published: Elsevier, 2022
Publish Date: 2022-11-30


FeCO3 cement can be produced by reacting CO2(aq) and particulate-Fe(0). Process conditions and solution compositions influence cement properties through kinetics of Fe-dissolution and FeCO3-precipitation. This study investigates Fe-dissolution in dilute systems (water(wt.)/Fe(wt.) = 1000) at 30/60 °C, and 1/10 barg CO2-pressures. Experimentally, time-evolution of solution composition shows increased [Fe] and solution-pH. As a proxy for high-pressure in-situ experiments, a modeling approach is developed to quantify with [Fe]-increase, the: decreased [H+], increased \([\mathit{HCO}_3^–]/[\mathrm{OH^–}]/[\mathit{CO}_3^{2–}],\), and undisturbed [CO2(aq)]/[H2CO3]. Fe-dissolution rates increase with: (a) pH-decrease with increased CO2-pressure, and (b) faster kinetics at higher temperatures, even with higher pH. Experimental and modeled pH are comparable at 1 bar, two causes are discussed for it being ∼ 1.2 times at 10 barg: CO2-depressurization, and Fe-precipitation. Lower CO2-mediated dissolution activation energies of ∼ 30 (1 barg) and ∼ 20 kJ/mol (10 barg) compared to strong acids (∼60 kJ/mol) are attributed to buffering action of CO2(aq).

see all

Series: Construction & building materials
ISSN: 0950-0618
ISSN-E: 1879-0526
ISSN-L: 0950-0618
Volume: 345
Article number: 128281
DOI: 10.1016/j.conbuildmat.2022.128281
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Funding: The authors wish to acknowledge the Province of Antwerp for research funding (Research project no. 33466).
Copyright information: © 2022 The Author(s). This is an open access article under the CC BY license (