Gluconate action in the hydration of calcium aluminate cements: Theoretical study, processing of aqueous suspensions and hydration reactivation

Autor(es)

dos Santos, Jr., T. ^[1] ; Pereira, I, C. ; Goncalves, R. ^[2] ; Salvini, V. R. ^[3] ; Zetterstrom, C. ^[4] ; Wohrmeyer, C. ^[4] ; Parr, C. ^[4] ; Pandolfelli, V. C. ^[5]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, FIRE Associate Lab, Mat Microstruct Engn Grp GEMM, Mat Engn Dept, Rodovia Washington Luis, Km 235, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Fed Sao Carlos, Ctr Dev Funct Mat CDMF, Chem Dept, Rodovia Washington Luis, Km 235, BR-13566905 Sao Carlos, SP - Brazil

^[3] Coll Technol FATEC Sertaozinho, Jordao Borghetti St 480, BR-14160050 Sertaozinho, SP - Brazil

^[4] FIRE Associate Co, Imerys Technol Ctr ITC Lyon, Le Chatelier St 1, ZAC Parc Technol, F-38090 Vaulx Milieu - France

^[5] Pereira, C., I, Univ Fed Sao Carlos, FIRE Associate Lab, Mat Microstruct Engn Grp GEMM, Mat Engn Dept, Rodovia Washington Luis, Km 235, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of the European Ceramic Society; v. 39, n. 8, p. 2748-2759, JUL 2019.
• Citações Web of Science: 0

Resumo

Considering the production of stable CAC aqueous suspensions, this work addressed the action of gluconate anion as a Ca2+ complexing agent and retarder of CAC hydration. Using quantum simulations, the complexation energy of gluconate complexes was calculated. The pH range of stability for the complexes was estimated and aqueous suspensions containing CAC and sodium gluconate (NaG), stable up to 4 days at room temperature, were prepared. Afterwards, their hydration reactions were reactivated by adjusting the systems' pH. Results of solidification kinetics and mineralogical characterisation highlighted that, after reactivation, calcium aluminate hydrates were formed. Thermodynamics simulations indicated that using NaG up to 1 wt% would not be deleterious to the systems refractoriness up to 1700 degrees C. These systems could be applied in less explored processing routes for CAC-based refractory compositions (e.g. slip casting, direct foaming and additive manufacturing), resulting in innovations to produce advanced refractory ceramics. (AU)

• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs