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, William G. Fahrenholtz, Soshu Kirihara, Yiquan Wu, Jingyang Wang, William J. Weber, Jake Amoroso, Michael Halbig, Tobias Fey, Kiyoshi Shimamura, Paolo Colombo, Kathleen Shurgart
PublisherAmerican Ceramic Society
Pages173-181
Number of pages9
Edition3
ISBN (Print)9781119040439
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

Fingerprint

Geopolymers
Microstructure
Composite materials
Bending strength
Carbonates
Dehydration
Dust
Potassium
Reinforcement
Porosity
Gases
Heat treatment
Cracks
Temperature
dolomite
Water
Chemical analysis

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

Cite this

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

Microstructure and flexure strengths of dolomite particulate-reinforced geopolymer composites. / Keane, Patrick F.; Kriven, Waltraud M.

Ceramic Engineering and Science Proceedings. ed. / Waltraud Kriven; William G. Fahrenholtz; Soshu Kirihara; Yiquan Wu; Jingyang Wang; William J. Weber; Jake Amoroso; Michael Halbig; Tobias Fey; Kiyoshi Shimamura; Paolo Colombo; Kathleen Shurgart. 3. ed. American Ceramic Society, 2019. p. 173-181 (Ceramic Engineering and Science Proceedings; Vol. 39, No. 3).

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

Keane, PF & Kriven, WM 2019, Microstructure and flexure strengths of dolomite particulate-reinforced geopolymer composites. in W Kriven, WG Fahrenholtz, S Kirihara, Y Wu, J Wang, WJ Weber, J Amoroso, M Halbig, T Fey, K Shimamura, P Colombo & K Shurgart (eds), Ceramic Engineering and Science Proceedings. 3 edn, Ceramic Engineering and Science Proceedings, no. 3, vol. 39, American Ceramic Society, pp. 173-181, 42nd International Conference on Advanced Ceramics and Composites, ICACC 2018, Daytona Beach, United States, 1/21/18.
Keane PF, Kriven WM. Microstructure and flexure strengths of dolomite particulate-reinforced geopolymer composites. In Kriven W, Fahrenholtz WG, Kirihara S, Wu Y, Wang J, Weber WJ, Amoroso J, Halbig M, Fey T, Shimamura K, Colombo P, Shurgart K, editors, Ceramic Engineering and Science Proceedings. 3 ed. American Ceramic Society. 2019. p. 173-181. (Ceramic Engineering and Science Proceedings; 3).
Keane, Patrick F. ; Kriven, Waltraud M. / Microstructure and flexure strengths of dolomite particulate-reinforced geopolymer composites. Ceramic Engineering and Science Proceedings. editor / Waltraud Kriven ; William G. Fahrenholtz ; Soshu Kirihara ; Yiquan Wu ; Jingyang Wang ; William J. Weber ; Jake Amoroso ; Michael Halbig ; Tobias Fey ; Kiyoshi Shimamura ; Paolo Colombo ; Kathleen Shurgart. 3. ed. American Ceramic Society, 2019. pp. 173-181 (Ceramic Engineering and Science Proceedings; 3).
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