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10.3390/ma13071750
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Article

Fabrication and Fireproofing Performance of the Coal Fly Ash-Metakaolin-Based Geopolymer Foams

by
Xi Peng
1,
Qin Shuai
2,
Han Li
2,
Qin Ding
2,3,
Yan Gu
2,
Chunjie Cheng
2 and
Zhonghui Xu
2,*
1
State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, China
2
Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China
3
School of Resources and Safety Engineering, Central South University, Changsha 410000, China
*
Author to whom correspondence should be addressed.
Materials 2020, 13(7), 1750; https://doi.org/10.3390/ma13071750
Submission received: 18 February 2020 / Revised: 21 March 2020 / Accepted: 30 March 2020 / Published: 9 April 2020
(This article belongs to the Section Porous Materials)
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Abstract

This paper aims to investigate the influence of coal fly ash (CFA) addition on the fireproof properties of the metakaolin-based geopolymer foams. The physical properties, thermal conductivity and fire resistance of the CFA-metakaolin-based geopolymer foams are discussed. The CFA-metakaolin-based geopolymer foams achieve a dry density between 259.43 kg/m3 and 349.73 kg/m3, a porosity between 71.78% and 72.98%, a thermal conductivity between 0.0871 W/(m·K) and 0.0944 W/(m·K) and a compressive strength between 0.38 MPa and 0.56 MPa, exhibiting better physical properties than that of the porous blocks without CFA addition. It is also found that the CFA addition could decrease the viscous sintering temperature and change the phase compositions of sintering products, resulting in the porous structure deterioration in a certain extent and obvious rise of the final reverse-side temperature during the fire-resistance tests. Fortunately, the conversion of the amorphous geopolymer gel to ceramics has helped to maintain the main skeleton structure stability. The CFA-metakaolin-based geopolymer foams still exhibit excellent fire resistance, and the reverse-side temperatures are always within 250 °C after 3 h fire-resistance tests.
Keywords: geopolymer foams; metakaolin; coal fly ash; physical properties; thermal conductivity; fire resistance geopolymer foams; metakaolin; coal fly ash; physical properties; thermal conductivity; fire resistance

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MDPI and ACS Style

Peng, X.; Shuai, Q.; Li, H.; Ding, Q.; Gu, Y.; Cheng, C.; Xu, Z. Fabrication and Fireproofing Performance of the Coal Fly Ash-Metakaolin-Based Geopolymer Foams. Materials 2020, 13, 1750. https://doi.org/10.3390/ma13071750

AMA Style

Peng X, Shuai Q, Li H, Ding Q, Gu Y, Cheng C, Xu Z. Fabrication and Fireproofing Performance of the Coal Fly Ash-Metakaolin-Based Geopolymer Foams. Materials. 2020; 13(7):1750. https://doi.org/10.3390/ma13071750

Chicago/Turabian Style

Peng, Xi, Qin Shuai, Han Li, Qin Ding, Yan Gu, Chunjie Cheng, and Zhonghui Xu. 2020. "Fabrication and Fireproofing Performance of the Coal Fly Ash-Metakaolin-Based Geopolymer Foams" Materials 13, no. 7: 1750. https://doi.org/10.3390/ma13071750

APA Style

Peng, X., Shuai, Q., Li, H., Ding, Q., Gu, Y., Cheng, C., & Xu, Z. (2020). Fabrication and Fireproofing Performance of the Coal Fly Ash-Metakaolin-Based Geopolymer Foams. Materials, 13(7), 1750. https://doi.org/10.3390/ma13071750

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