Electrokinetic and thermodynamic characterization of lime-water interface: Physical and rheological properties of lime mortar

• Published in: Construction & building materials Vol. 151; pp. 809 - 818
• Main Authors: Ontiveros-Ortega, E., Ontiveros-Ortega, A., Moleon, J.A., Ruiz-Agudo, E.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.10.2017; Elsevier B.V
• Subjects: Analysis; Lime; Lime industry; Management; Portlandite; Putty lime; Quicklime; Surface free energy; Thermodynamics; ξ potential; United States; Lime; ξ potential; Portlandite; Putty lime; Surface free energy; Quicklime
• ISSN: 0950-0618; 1879-0526
• DOI: 10.1016/j.conbuildmat.2017.06.147

•The calcination process of limestone modifies the surface free energy of the lime.•Quicklime is more hydrophilic when produced in a traditional kiln between 850–900°C.•ξ potential of traditional quicklime were much larger than industrial quicklime.•The traditional process generates products with more plasticity. The surface properties of the portlandite are very important in the behavior of the suspensions of lime used as binders, plasters, mortars and paint, for use in the architecture heritage conservation. These rheological properties depend heavily on surface thermodynamic properties, surface tension-surface free energy and load the lime present in aqueous medium. It selected two types of quicklime, originating from the same rock but made in two types of kilns: traditional and industrial Kiln. It has determined values of the surface free energy of the lime in the form of CaO and Ca(OH)2 as well as the rock used in its preparation. In addition, it conducted an electrokinetic study to determine electrophoretic mobility in a water/lime system. It analyzed various types of oxides after laboratory slaking and periods during which the portlandite remained in water. This study revealed that quicklime is monopolar and has a hydrophilic nature. Tradition quicklime, γTotal values decrease as temperature increases the calcination of limestone. This has greater hydrophilicity than that of industrial quicklime. Moreover, traditional lime, introduces more charges than that fabricated by industrial processes, with larger values of ξ Potential. ξ Potential data confirm the optimal plasticity properties of the traditional lime, and that this quality is maintained.