Freeze-Thaw Resistance and Reliability Analysis of Iron Tailings Sand Foam Concrete

Abstract

Abstract: In order to study the freeze-thaw resistance of iron tailings sand foam concrete, five groups of foam concrete with a target density of 900 kg/m³ were prepared. The mass loss, strength loss, pore area rate and microstructure of foam concrete with different iron tailings sand content after freeze-thaw cycle in sulfate environment were compared and analyzed. Taking the mass loss and strength loss as the measurement indexes, the optimal mix ratio was selected, and the reliability analysis and residual life prediction were carried out based on the Wiener degradation process. The results show that during the sulfate freeze-thaw cycle, the surface of foam concrete is damaged, the internal pores are connected to form cracks, and the mass of each specimen increases first and then decreases. The compressive strength and pore area rate continue to decline, and the addition of fine iron tailings sand effectively alleviates the damage of foamed concrete. Among them, the foam concrete with 20% (mass fraction) iron tailings sand content has the strongest freeze-thaw resistance, and the specimen fails after about 300 freeze-thaw cycles. This study can provide ideas for the application of foam concrete in frozen soil areas.

Key words: iron tailings sand, foam concrete, freeze-thaw cycle, sulfate environment, Wiener degradation process

CLC Number:

TU528

ZHU Liping, DU Xiaoli, ZOU Tianmin. Freeze-Thaw Resistance and Reliability Analysis of Iron Tailings Sand Foam Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(11): 3988-3995.

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