Researchers Examine Frost Heaving in Prestressed Concrete Structures

Recent research highlights the significant challenges posed by freeze-thaw (FT) damage in prestressed concrete (PC) structures, especially in cold regions. The study, conducted by Xiguang Liu from Xi’an University of Architecture and Technology and colleagues from Beijing YJK Building Software Co., Ltd., investigates the frost heaving behavior and mechanical deterioration of bonded post-tensioned PC components when exposed to FT cycles.

The research addresses a critical gap in understanding how FT cycles can lead to serious structural issues, such as frost heaving and cracking. These problems can ultimately compromise the safety and durability of PC structures. The study examined how varying stress levels and the number of FT cycles impact the strain characteristics of prestressing tendons.

Experimental Approach and Key Findings

The team designed and fabricated eight bonded post-tensioned PC components subjected to a series of FT cycles, specifically 0, 50, 100, 150, 200, 250, and 300 cycles, at varying stress levels of 0.1, 0.2, 0.3, and 0.4. Throughout the experiment, they meticulously measured strain variations along the components as they underwent FT exposure.

Results indicated a clear correlation between the number of FT cycles and the increase in concrete frost heaving strain, residual strain, and prestressing tendon strain loss. The study revealed that at lower stress levels, prestress can help mitigate concrete frost cracking. Conversely, as stress levels increase, the risk of frost cracking intensifies.

To better understand these phenomena, the researchers established a strain loss model that aligns closely with their experimental findings. This model provides crucial insights for the design and maintenance of PC structures in cold climates, offering a framework for engineers and architects working in these challenging environments.

Implications for Future Construction

The findings from this study are particularly relevant as the application of PC structures continues to grow in cold regions. The research underscores the importance of considering frost heaving behavior and mechanical deterioration in design specifications. By doing so, engineers can enhance the longevity and safety of these structures, ultimately benefiting infrastructure development in colder climates.

The comprehensive study titled “Frost heaving behavior and mechanical deterioration of prestressed concrete” offers valuable theoretical and experimental insights. For those interested in the detailed methodology and outcomes, the full text is available at https://doi.org/10.1007/s11709-025-1188-1.