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.
孙科科, 彭小芹, 冉鹏, 王淑萍, 曾路, 李静静, 王双. 地聚合物混凝土抗冻性影响因素[J]. 材料导报, 2021, 35(24): 24095-24100.
SUN Keke, PENG Xiaoqin, RAN Peng, WANG Shuping, ZENG Lu, LI Jingjing, WANG Shuang. The Influence Factor of the Anti-freeze of Geopolymer Concrete. Materials Reports, 2021, 35(24): 24095-24100.
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2021, Vol. 35 
