Impact of Freeze-Thaw Cycles on the Long-Term Performance of Concrete Pavement and Related Improvement Measures: A Review

Abstract

Freeze-thaw damage is one of the most severe threats to the long-term performance of concrete pavement in cold regions. Currently, the freeze-thaw deterioration mechanism of concrete pavement has not been fully understood. This study summarizes the significant findings of concrete pavement freeze-thaw durability performance, identifies existing knowledge gaps, and proposes future research needs. The concrete material deterioration mechanism under freeze-thaw cycles is first critically reviewed. Current deterioration theories mainly include the hydrostatic pressure hypothesis, osmolarity, and salt crystallization pressure hypothesis. The critical saturation degree has been proposed to depict the influence of internal saturation on freeze-thaw damage development. Meanwhile, the influence of pore solution salinity on freeze-thaw damage level has not been widely investigated. Additionally, the deterioration mechanism of the typical D-cracking that occurs in concrete pavement has not been fully understood. Following this, we investigate the coupling effect between freeze-thaw and other loading or environmental factors. It is found that external loading can accelerate the development of freeze-thaw damage, and the acceleration becomes more evident under higher stress levels. Further, deicing salts can interact with concrete during freeze-thaw cycles, generating internal pores or leading to crystalline expansion pressure. Specifically, freeze-thaw development can be mitigated under relatively low ion concentration due to increased frozen points. The interactive mechanism between external loading, environmental ions, and freeze-thaw cycles has not been fully understood. Finally, the mitigation protocols to enhance frost resistance of concrete pavement are reviewed. Besides the widely used air-entraining process, the freeze-thaw durability of concrete can also be enhanced by using fiber reinforcement, pozzolanic materials, surface strengthening, Super Absorbent Polymers (SAPs), and Phase Change Materials. This study serves as a solid base of information to understand how to enhance the freeze-thaw durability of concrete pavement.

Keywords: concrete pavement; deicing agents; freeze–thaw cycles; multi-factor coupling.

Figure 1

Demonstration of D-cracking in concrete pavement [11].

Figure 2

Scheme of the review article.

Figure 3

Hydrostatic pressure model.

Figure 4

Cumulative mass scaling of identical samples with various ice-layer thicknesses (after three freezing–thawing cycles) [104].

Figure 5

Internal stress induced by temperature gradients [99].

Figure 6

Reaction diagrammatic sketch of silane protective layer [107].

Figure 7

Schematic depicting capillarity and “absorption” of water by air diffusion [109]: (a) Before immersion in water; (b) Before immersion in water; (c) During freezing and thawing.

Figure 8

Schematic of using PCM in concrete pavement to melt ice and snow using lightweight aggregate (LWA) [123].

Figure 9

Schematic illustrating three methods of incorporating PCM into concrete: (a) using pipes of PCM; (b) using particles containing PCM; (c) filling concrete surface voids via PCM absorption [123].