Chemistry of the calcite/water interface: Influence of sulfate ions and consequences in terms of cohesion forces
Calcite suspensions are used to mimic the behavior of more complex cementitious systems. Therefore the characterization of calcite–water interface in strong alkaline conditions, through ionic adsorption, electrokinetic measurements, static rheology and atomic force microscopy is a prerequisite. Calc...
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| Veröffentlicht in: | Cement and concrete research 2013-10, Vol.52, p.22-30 |
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| creator | Pourchet, Sylvie Pochard, Isabelle Brunel, Fabrice Perrey, Danièle |
| description | Calcite suspensions are used to mimic the behavior of more complex cementitious systems. Therefore the characterization of calcite–water interface in strong alkaline conditions, through ionic adsorption, electrokinetic measurements, static rheology and atomic force microscopy is a prerequisite. Calcium, a potential determining ion for calcite, adsorbs specifically onto the weakly positively charged calcite surface in water. This leads to an increase of the repulsive electric double layer force and thus weakens the particle cohesion. Sulfate adsorption, made at constant calcium concentration and ionic strength, significantly increases the attractive interactions between the calcite particles despite its very low adsorption. This is attributed to a lowering of the electrostatic repulsion in connection with the evolution of the zeta potential. The linear relationship found between the yield stress and ζ2 proves that the classical DLVO theory applies for these systems, contrary to what was previously observed with C–S–H particles under the same conditions. |
| doi_str_mv | 10.1016/j.cemconres.2013.04.002 |
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Therefore the characterization of calcite–water interface in strong alkaline conditions, through ionic adsorption, electrokinetic measurements, static rheology and atomic force microscopy is a prerequisite. Calcium, a potential determining ion for calcite, adsorbs specifically onto the weakly positively charged calcite surface in water. This leads to an increase of the repulsive electric double layer force and thus weakens the particle cohesion. Sulfate adsorption, made at constant calcium concentration and ionic strength, significantly increases the attractive interactions between the calcite particles despite its very low adsorption. This is attributed to a lowering of the electrostatic repulsion in connection with the evolution of the zeta potential. The linear relationship found between the yield stress and ζ2 proves that the classical DLVO theory applies for these systems, contrary to what was previously observed with C–S–H particles under the same conditions.</description><identifier>ISSN: 0008-8846</identifier><identifier>EISSN: 1873-3948</identifier><identifier>DOI: 10.1016/j.cemconres.2013.04.002</identifier><identifier>CODEN: CCNRAI</identifier><language>eng</language><publisher>Kidlington: Elsevier Ltd</publisher><subject>ADSORPTION ; Adsorption (C) ; Aggregates and other concrete constituents ; Applied sciences ; ATOMIC FORCE MICROSCOPY ; Buildings. Public works ; CaCO3 (D) ; CALCITE ; CALCIUM ; Cement concrete constituents ; Cements ; Chemical Sciences ; Cohesion ; Computation methods. Tables. Charts ; Concrete additives (fillers, pozzolanic and hydraulic materials) ; ELECTRICAL PROPERTIES ; Electrical properties (C) ; Electrostatics ; Exact sciences and technology ; INTERACTIONS ; INTERFACES ; IONS ; Materials ; MATERIALS SCIENCE ; Polymers ; Rheology (A) ; STRESSES ; Structural analysis. 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Therefore the characterization of calcite–water interface in strong alkaline conditions, through ionic adsorption, electrokinetic measurements, static rheology and atomic force microscopy is a prerequisite. Calcium, a potential determining ion for calcite, adsorbs specifically onto the weakly positively charged calcite surface in water. This leads to an increase of the repulsive electric double layer force and thus weakens the particle cohesion. Sulfate adsorption, made at constant calcium concentration and ionic strength, significantly increases the attractive interactions between the calcite particles despite its very low adsorption. This is attributed to a lowering of the electrostatic repulsion in connection with the evolution of the zeta potential. The linear relationship found between the yield stress and ζ2 proves that the classical DLVO theory applies for these systems, contrary to what was previously observed with C–S–H particles under the same conditions.</description><subject>ADSORPTION</subject><subject>Adsorption (C)</subject><subject>Aggregates and other concrete constituents</subject><subject>Applied sciences</subject><subject>ATOMIC FORCE MICROSCOPY</subject><subject>Buildings. Public works</subject><subject>CaCO3 (D)</subject><subject>CALCITE</subject><subject>CALCIUM</subject><subject>Cement concrete constituents</subject><subject>Cements</subject><subject>Chemical Sciences</subject><subject>Cohesion</subject><subject>Computation methods. Tables. Charts</subject><subject>Concrete additives (fillers, pozzolanic and hydraulic materials)</subject><subject>ELECTRICAL PROPERTIES</subject><subject>Electrical properties (C)</subject><subject>Electrostatics</subject><subject>Exact sciences and technology</subject><subject>INTERACTIONS</subject><subject>INTERFACES</subject><subject>IONS</subject><subject>Materials</subject><subject>MATERIALS SCIENCE</subject><subject>Polymers</subject><subject>Rheology (A)</subject><subject>STRESSES</subject><subject>Structural analysis. 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Public works</topic><topic>CaCO3 (D)</topic><topic>CALCITE</topic><topic>CALCIUM</topic><topic>Cement concrete constituents</topic><topic>Cements</topic><topic>Chemical Sciences</topic><topic>Cohesion</topic><topic>Computation methods. Tables. Charts</topic><topic>Concrete additives (fillers, pozzolanic and hydraulic materials)</topic><topic>ELECTRICAL PROPERTIES</topic><topic>Electrical properties (C)</topic><topic>Electrostatics</topic><topic>Exact sciences and technology</topic><topic>INTERACTIONS</topic><topic>INTERFACES</topic><topic>IONS</topic><topic>Materials</topic><topic>MATERIALS SCIENCE</topic><topic>Polymers</topic><topic>Rheology (A)</topic><topic>STRESSES</topic><topic>Structural analysis. 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Therefore the characterization of calcite–water interface in strong alkaline conditions, through ionic adsorption, electrokinetic measurements, static rheology and atomic force microscopy is a prerequisite. Calcium, a potential determining ion for calcite, adsorbs specifically onto the weakly positively charged calcite surface in water. This leads to an increase of the repulsive electric double layer force and thus weakens the particle cohesion. Sulfate adsorption, made at constant calcium concentration and ionic strength, significantly increases the attractive interactions between the calcite particles despite its very low adsorption. This is attributed to a lowering of the electrostatic repulsion in connection with the evolution of the zeta potential. 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| subjects | ADSORPTION Adsorption (C) Aggregates and other concrete constituents Applied sciences ATOMIC FORCE MICROSCOPY Buildings. Public works CaCO3 (D) CALCITE CALCIUM Cement concrete constituents Cements Chemical Sciences Cohesion Computation methods. Tables. Charts Concrete additives (fillers, pozzolanic and hydraulic materials) ELECTRICAL PROPERTIES Electrical properties (C) Electrostatics Exact sciences and technology INTERACTIONS INTERFACES IONS Materials MATERIALS SCIENCE Polymers Rheology (A) STRESSES Structural analysis. Stresses Sulfate (D) SULFATES Surface chemistry SURFACES SUSPENSIONS |
| title | Chemistry of the calcite/water interface: Influence of sulfate ions and consequences in terms of cohesion forces |
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