3,4-dihydroxybenzoic acid forms soluble complexes in cementitious systems
Bagheri, Sepideh; Mankinen, Otto; Ojala, Satu; Telkki, Ville Veikko; Luukkonen, Tero; Yliniemi, Juho (2024-04-11)
Elsevier
11.04.2024
Sepideh Bagheri, Otto Mankinen, Satu Ojala, Ville-Veikko Telkki, Tero Luukkonen, Juho Yliniemi, 3,4-dihydroxybenzoic acid forms soluble complexes in cementitious systems, Journal of Non-Crystalline Solids, Volume 633, 2024, 122962, ISSN 0022-3093, https://doi.org/10.1016/j.jnoncrysol.2024.122962
https://creativecommons.org/licenses/by/4.0/
© 2024 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
https://creativecommons.org/licenses/by/4.0/
© 2024 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
https://creativecommons.org/licenses/by/4.0/
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:oulu-202404172807
https://urn.fi/URN:NBN:fi:oulu-202404172807
Tiivistelmä
Abstract
Various amorphous multi-oxide silicates can be used as a precursor for cementitious binders. However, their dissolution kinetics are often slow and further inhibited by ions adsorbed on their surfaces. Organic ligands as complexing agents could enhance their extent of dissolution. Here, the effect of 3,4-dihydroxybenzoic acid (DHBA) with 1 mM concentration on early-stage dissolution of blast furnace slag and basaltic glass was investigated at pH 12–14. DHBA impacted the dissolution depending on the pH and composition of the raw material. Liquid-state 13C and 1H NMR spectroscopy proved fast formation of two types of soluble complexes: 1) complexation between phenolic groups of DHBA and Al3+, Mg2+, Ca2+ and Fe3+, and 2) complexation between carboxylic groups of DHBA and Fe3+. Thermodynamic modelling of solution and precipitation chemistry showed that experimental results are in line with modelling. X-ray photoelectron spectroscopy indicated that DHBA prevents the accumulation of cations on the silicate surface.
Various amorphous multi-oxide silicates can be used as a precursor for cementitious binders. However, their dissolution kinetics are often slow and further inhibited by ions adsorbed on their surfaces. Organic ligands as complexing agents could enhance their extent of dissolution. Here, the effect of 3,4-dihydroxybenzoic acid (DHBA) with 1 mM concentration on early-stage dissolution of blast furnace slag and basaltic glass was investigated at pH 12–14. DHBA impacted the dissolution depending on the pH and composition of the raw material. Liquid-state 13C and 1H NMR spectroscopy proved fast formation of two types of soluble complexes: 1) complexation between phenolic groups of DHBA and Al3+, Mg2+, Ca2+ and Fe3+, and 2) complexation between carboxylic groups of DHBA and Fe3+. Thermodynamic modelling of solution and precipitation chemistry showed that experimental results are in line with modelling. X-ray photoelectron spectroscopy indicated that DHBA prevents the accumulation of cations on the silicate surface.
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