地聚合物混凝土抗冻性影响因素

doi:10.11896/cldb.20090292

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Abstract Geopolymer concretes with different compressive strength were prepared by alkali-activated metakaolin by adjusting the molar ratio of geopolymer oxides SiO₂/Al₂O₃, Na₂O/Al₂O₃ and H₂O/Na₂O. The freeze-thaw cycles of geopolymer concrete and ordinary portland cement (OPC) concrete were tested and the anti-freeze property of those concrete were compared. Results showed that the anti-free-zing of geopolymer concrete decreased with the increase of the n(Na₂O)/n(Al₂O₃) and n(H₂O)/n(Na₂O). The optimal anti-freezing of geopolymer concrete was achieved when the n(SiO₂)/n(Al₂O₃)=3.3 was used and the freeze-thaw number could reach to 200 cycles. There was a slightly decrease in relative dynamic elasticity modulus when freeze-thaw damage of geopolymer concrete reached to the failure limit, illustrated that the main failure form of geopolymer concrete under the freeze-thaw cycles was the surface scale, but the damage ratio of inner structure was lower than that of the OPC concrete. For concrete with compressive strength between 30 MPa and 50 MPa, the anti-freezing of geopolymer concrete was slightly better than that of the OPC concrete. However, for concrete with compressive strength between 50 MPa and 70 MPa, the anti-freezing of geopolymer concrete was much lower than that of the OPC concrete. The coefficient of water saturation of geopolymer concrete ranged from 0.85 to 0.95, indicating that the majority pore was the open pore.

Key words： geopolymer concrete coefficient of water saturation anti-freezing damage mechanism

Published: 25 December 2021 Online: 2021-12-27

CLC number:

TU52

Fund:This work was financially supported by the National Natural Science Foundation of China (51678093), the Project of Fundamental Research Funds for the Central Universities (2019CDJGFCL002), the Graduate Scientific Research and Innovation Foundation of Chongqing (CYB19004).

About author: Keke Sunis currently a Ph.D. student in College of Materials Science and Engineering at Chongqing University, and focusing on the durability of alkali-activated materials.

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	SUN Keke
	PENG Xiaoqin
	RAN Peng
	WANG Shuping
	ZENG Lu
	LI Jingjing
	WANG Shuang

Cite this article:

SUN Keke,PENG Xiaoqin,RAN Peng, et al. The Influence Factor of the Anti-freeze of Geopolymer Concrete[J]. Materials Reports, 2021, 35(24): 24095-24100.

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http://www.mater-rep.com/EN/10.11896/cldb.20090292 OR http://www.mater-rep.com/EN/Y2021/V35/I24/24095

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