Portlandite solubility and Ca 2+ activity in presence of gluconate and hexitols

6533b870fe1ef96bd12cf388

RESEARCH PRODUCT

Portlandite solubility and Ca 2+ activity in presence of gluconate and hexitols

Bouzouaid Lina Fernandez-martinez Alejandro Barbara Lothenbach Christophe Labbez

subject

[CHIM.INOR] Chemical Sciences/Inorganic chemistry Alite Potentiometric titration Inorganic chemistry FOS: Physical sciences chemistry.chemical_element 02 engineering and technology engineering.material Calcium [CHIM.INOR]Chemical Sciences/Inorganic chemistry 010402 general chemistry 01 natural sciences Portlandite law.invention chemistry.chemical_compound law Physics - Chemical Physics [CHIM.CRIS]Chemical Sciences/Cristallography General Materials Science Solubility [CHIM.CRIS] Chemical Sciences/Cristallography Chemical Physics (physics.chem-ph)Condensed Matter - Materials Science [CHIM.MATE] Chemical Sciences/Material chemistry Materials Science (cond-mat.mtrl-sci)Sorption Building and Construction [CHIM.MATE]Chemical Sciences/Material chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Portland cement chemistry engineering Hydroxide 0210 nano-technology [SDU.STU.MI]Sciences of the Universe [physics]/Earth Sciences/Mineralogy [SDU.STU.MI] Sciences of the Universe [physics]/Earth Sciences/Mineralogy

description

The current paper investigates the impact of gluconate, D-sorbitol, D-mannitol and D-galactitol on calcium speciation at high pH values by i) solubility measurements of portlandite (Ca(OH)2) and ii) potentiometric titration measurements of calcium salt solutions. Thermodynamic modeling was used to fit the chemical activities of Ca2+ and OH- ions and thus to determine the strength and kind of the different Ca-organic-hydroxide complexes. The strength of complex formation with Ca decreases in the order gluconate >> sorbitol > mannitol > galactitol, which follows the same order as sorption on portlandite. Heteropolynuclear gluconate complexes with calcium and hydroxide dominate the Ca-speciation in the presence of portlandite, while for sorbitol ternary CaSorbOH+ complexes were dominant under alkaline conditions. We expect that these results will help in better understanding the influence of gluconate and hexitols on the hydration of alite and Portland cement.

year	journal	country	edition	language
2021-02-01

https://hal.science/hal-03370261

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