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Meeting Materials Science & Technology 2020
Symposium Journal of the American Ceramic Society Awards Symposium
Presentation Title Advances in Polymer-assisted Sol-gel Synthesis of Aluminosilicate Precursors for Modern Cementitious Materials
Author(s) Juan Pablo Gevaudan, Jaqueline D. Wallat, Bimala Lama, Wil V. Srubar
On-Site Speaker (Planned) Juan Pablo Gevaudan
Abstract Scope This presentation explores recent advances and future trajectories in the utilization of polymer-assisted sol-gel (PSG) synthesis to produce modern cementitious materials. By leveraging nuclear magnetic resonance, X-ray diffraction and infrared spectroscopy experiments, we demonstrate how critical PSG factors (e.g., pH aging conditions, ion concentration, polymer type and architecture) affect the atomic structure of a sodium-stabilized aluminosilicate hydrate (N-A-S-H) geopolymer cement. More specifically, results demonstrate that polymer architecture is a key factor in producing undesirable phase segregation and incomplete dehydroxylation (vicinal silanol) in cement precursors. PEG-derived aluminosilicate precursors yield partial dissolution and produce geopolymer cements with variable silicate incorporation. Contrastingly, PVA-derived aluminosilicate powders produce geopolymer cements with identical mineralogy to that of metakaolin-based geopolymer cements and exhibit both Brønsted-acid sites near the aluminum nuclei and geminal silanol groups. We hypothesize three plausible metal-complexation processes of PSG, which can be leveraged to postulate future trajectories in the manufacturing of sustainable cementitious materials.

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Advances in Polymer-assisted Sol-gel Synthesis of Aluminosilicate Precursors for Modern Cementitious Materials
Direct-Writing of 3D Photonic Crystals with Tunable Terahertz Properties
Effect of CaF2, B2O3 and the CaO/SiO2 Mass Ratio on the Viscosity and Structure of B2O3–Containing Calcium–silicate–based Melts
Glass-ceramics as Potential Waste Forms for Actinide Immobilization
Improvements of Fergusonite-type Microwave Dielectric Ceramics by Ions Substitutions
Introductory Comments: Journal of the American Ceramic Society Awards Symposium
Phase Formation and Mechanical Properties of (Mg,Co,Ni,Cu,Zn)O High Entropy Ceramics by Field Assisted Sintering Technology
Substitutional Effect of Na2O with K2O on the Viscosity and Structure of CaO-SiO2-CaF2-based Mold Flux Systems
Thermochemical Investigation of Lithium Borate Glasses and Crystals

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