Microstructure and flexure strengths of dolomite particulate-reinforced geopolymer composites

Patrick F. Keane, Waltraud M. Kriven

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Potassium‐based geopolymer was fabricated at room temperature by high shear mixing of potassium metasilicate and metakaolin, forming a composition of K2O Al2O3 4SiO211H2O. Dolomite dust waste product was used as a particulate reinforcement to form composites containing 0, 20, 30 and 40 wt % dolomite (CaMg(CO3)2). The composites were heat treated at 400, 800 and 1,000°C for 1 hour at a slow ramp rate of 1 °C/min. While single phase geopolymer exhibited 3‐pt flexural strengths of ˜7MPa, geopolymer composites containing 20 wt % dolomite and cured at room temperature achieved ˜16 ± 3.5 MPa. In general, strengths drastically decreased due to dehydration, but began to recover after 1000 °C heat treatments. Dolomite particulates helped to dissipate crack energy and enhanced flexural strengths. The geopolymer composites experienced increased porosity due to water loss at 400°C and liberation of CO2 gas from carbonates at ≥ 800°C.

Original languageEnglish (US)
Title of host publicationCeramic Engineering and Science Proceedings
EditorsWaltraud Kriven, Jingyang Wang, William J. Weber, Kiyoshi Shimamura, Yiquan Wu, Kathleen Shurgart, Soshu Kirihara, Jake Amoroso, Michael Halbig, William G. Fahrenholtz, Tobias Fey, Paolo Colombo
PublisherAmerican Ceramic Society
Pages173-181
Number of pages9
Edition3
ISBN (Electronic)9781119519645, 9781119543268, 9781119543305
StatePublished - Jan 1 2019
Event42nd International Conference on Advanced Ceramics and Composites, ICACC 2018 - Daytona Beach, United States
Duration: Jan 21 2018Jan 26 2018

Publication series

NameCeramic Engineering and Science Proceedings
Number3
Volume39
ISSN (Print)0196-6219

Conference

Conference42nd International Conference on Advanced Ceramics and Composites, ICACC 2018
CountryUnited States
CityDaytona Beach
Period1/21/181/26/18

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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  • Cite this

    Keane, P. F., & Kriven, W. M. (2019). Microstructure and flexure strengths of dolomite particulate-reinforced geopolymer composites. In W. Kriven, J. Wang, W. J. Weber, K. Shimamura, Y. Wu, K. Shurgart, S. Kirihara, J. Amoroso, M. Halbig, W. G. Fahrenholtz, T. Fey, & P. Colombo (Eds.), Ceramic Engineering and Science Proceedings (3 ed., pp. 173-181). (Ceramic Engineering and Science Proceedings; Vol. 39, No. 3). American Ceramic Society.