Strength Acquisition Mechanism of High Temperature Resistant Materials Prepared by Waste Architectural Ceramics

doi:10.19691/j.cnki.1004-4493.2022.01.002

China's Refractories ›› 2022, Vol. 31 ›› Issue (1): 8-15.DOI: 10.19691/j.cnki.1004-4493.2022.01.002

Strength Acquisition Mechanism of High Temperature Resistant Materials Prepared by Waste Architectural Ceramics

HUANG Zhaohui¹^,^*(), SHI Tengteng¹, LIU Yangai¹, WU Xiaowen¹, LIU Xianjie¹, LIN Fankai¹, LENG Gouqin¹, ZHAN Huasheng², LI Yanjing², GAO Changhe²

1 Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, School of Materials Science and Technology, China University of Geosciences (Beijing), Beijing 100083, China
2 Beijing Jinyu Tongda Refractory Technology Co., Ltd., Beijing 100043, China

Online:2022-03-15 Published:2022-04-02
Contact: HUANG Zhaohui
About author:Dr. Huang Zhaohui, born in 1963, is a professor of China University of Geosciences (Beijing). He got his B. Sc. and M. Sc. from Xi’an University of Architecture and Technology in 1983 and 1994, respectively, and his Ph. D. from University of Science and Technology Beijing in 2002, majoring in inorganic materials. From 2002 to 2004, he was engaged in postdoctoral research in the Department of Materials of Tsinghua University. He mainly focuses on the research of high temperature composite materials including metal oxides and non-oxides, lightweight high-temperature materials, circulatory utilization of mineral resources and industrial solid wastes, fire-resistant materials/wear-resistant materials and concrete for special construction, and imitation stone ceramic bricks.

Abstract

Abstract:

In order to realize the large-scale and high-value utilization of waste architectural ceramics, high-temperature resistant materials based on waste architectural ceramics were prepared with sodium silicate as the binder, clay/bauxite and metakaolin/bauxite as coating materials, and the cold strength obtaining mechanism was explored. The phase composition, the microstructure and the mechanical properties of the high temperature resistant materials based on waste architectural ceramics were tested and analyzed. The results showed that when the heat treatment temperature was between 110-1 000 ℃, the strength of the samples mainly came from the physical adhesion of sodium silicate and fine powder. When the temperature rose to 1 100 ℃, the strength of the sample was improved since the internal low-melting-point components melted and promoted sintering. The addition of clay and bauxite can effectively enhance the flexural strength of the samples when the heat treatment temperature is 1 000 ℃. When the heat treatment temperature rises from 900 to 1 000 ℃, the flexural strength of the samples will be enhanced owing to the formation of silica alumina spinel and mullite from metakaolin.

Key words: waste architectural ceramics, high value utilization, high-temperature resistant materials, flexural strength

HUANG Zhaohui, SHI Tengteng, LIU Yangai, WU Xiaowen, LIU Xianjie, LIN Fankai, LENG Gouqin, ZHAN Huasheng, LI Yanjing, GAO Changhe. Strength Acquisition Mechanism of High Temperature Resistant Materials Prepared by Waste Architectural Ceramics[J]. China's Refractories, 2022, 31(1): 8-15.

Figures/Tables 11

Table 1 Chemical composition of raw materials /mass%

Raw material	SiO₂	Al₂O₃	K₂O	Na₂O	Fe₂O₃	CaO	TiO₂	MgO	Others
Waste architectural ceramic	73.64	17.46	2.35	3.48	1.60	0.48	0.18	0.51	0.30
Clay	56.57	38.57	1.18	0.18	2.02	0.18	0.67	0.32	0.12
Bauxite	33.11	60.42	0.38	-	1.21	0.91	3.16	0.20	0.61
Metakaolin	53.96	45.00	0.04	0.08	0.19	0.16	0.49	-	0.08

Fig. 1 XRD pattern of waste architectural ceramic

Table 2 Ingredient composition of experimental schemes /mass%

Sample number	Coarse particles	Medium particles	Fine particles	Fine powder	Bauxite	Clay	Metakaolin	Sodium silicate (extra adding)
S1	45	25	-	30	-	-	-	5
S2	45	25	5	10	5	10	-	5
S3	45	25	5	10	5	-	10	5

Fig. 2 Appearance of samples S1 (a), S2 (b) and S3 (c) before and after heat treatment at different temperatures

Fig. 3 Cold flexural strength of samples S1 (a), S2 (b) and S3 (c) after heat treatment at different temperatures

Fig. 4 SEM images of fracture surface of samples S2 after heat treatment at different temperatures

Fig. 5 XRD patterns of samples S1 (a), S2 (b) and S3 (c) after heat treatment at different temperatures

Fig. 6 Cold flexural strength (a), apparent porosity (b) and bulk density (c) of samples prepared by different methods before and after thermal shock test

Fig. 7 SEM images of fracture surface of samples before and after thermal shock test

Fig. 8 Appearance of samples after high temperature flexural strength test

Fig. 9 Flexural strength of samples at 700 and 800 ℃

References 9

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