Performance degradation of polymer material under freeze-thaw cycles: A case study of extruded polystyrene board

Niu, Fujun; Jiang, Haiqiang; Su, Wenji; Jiang, Wangtao; He, Junlin

doi:10.1016/j.polymertesting.2021.107067

Cited by 23 publications

(8 citation statements)

References 29 publications

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“…For example, the temperature control system of the chamber was set as −20 °C, when the temperature inside the chamber reached −20 °C, the temperature control was set and kept 3 Geofluids 4 Geofluids constantly as 20 °C, and the whole time taken by one freezethaw cycle was 6 hours in the study [39]. Furthermore, the freezing and thawing durations also were set as 4 hours and 2 hours, respectively, in some studies [25]. The number of CFTs also differed considerably in previous tests.…”

Section: Testing Methodsmentioning

confidence: 99%

“…The results showed that the Yong's modulus was reduced by 5.35%, 2.83%, 9.14%, and 6.53% (FM200, FM700, SP350, and LB, respectively) after 50 CFTs, while the reduction rate of Young's modulus was 6.49%, 3.27%, 9.64%, and 7.48% for the XPS subjected to 400 times CFTs [25].…”

Section: Changes In Deformation Properties Of Tims Under Cftsmentioning

confidence: 95%

“…According to Yang et al, after 50 CFTs, the elastic modulus of the glazed hollow bead thermal insulation mortar decreased by 20%, which showed that CFTs caused irreversible strain to the mortar [70]. Niu et al [25] measured the elastic modulus of four kinds of XPS with different apparent densities, including FM200 (30.75 g•cm −3 ), FM700 (52.10 g•cm −3 ), SP350 (33.40 g•cm −3 ), and LB (32.64 g•cm −3 ).…”

Section: Changes In Deformation Properties Of Tims Under Cftsmentioning

confidence: 99%

“…According to Zhao et al, the creep properties of EPS, XPS, and ethylene vinyl acetate copolymer (EVA) were well in dry condition but the change of creep deformation of EVA was larger than that of EPS and XPS when these materials were immersed in water [53]. According to Niu et al, the creep strain of XPS is the decay creep [25].…”

Section: Changes In Deformation Properties Of Tims Under Cftsmentioning

confidence: 99%

“…The CFTs can cause cracks in more porous medium, particularly when moisture participates in this process. When the temperature falls below the freeze point, the water turns to ice and expands by 9% in volume [20][21][22][23][24][25] and the frost-heaving force will cause the destruction of solid skeleton and cellar [26]. After being subjected to the CFTs, the TIMs would suffer severe microstructure modifications and consequent deterioration in mechanical strength, thermal insulation characteristics, waterproof ability, fire resistance, and so on.…”

Section: Introductionmentioning

confidence: 99%

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Freeze-Thaw Resistance of Thermal Insulating Materials Used in Cold Regions Engineering: A State-of-the-Art Review

Zhang

et al. 2022

Geofluids

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Thermal insulating materials (TIMs) are widely used in roadways, tunnels, airfields, pipeline systems, and buildings in cold regions to prevent infrastructure from freeze damages and reduce energy consumption. During the period of use in cold regions, however, seasonal freeze-thaw actions can cause degradation of thermal and mechanical properties of TIMs and even malfunctions. Lots of research has been carried out on the durability of TIMs under cyclic freeze-thaw (CFT), but comprehensive reviews are scarce at present. Based on a literature review, the state and development of the test apparatus, temperature controls for the CFT test, and changes in the thermal and mechanical characteristics of TIMs during the CFT operations were summarized in this study. The review shows that the CFT can damage the TIMs’ microstructure, which will result in an increase in the materials’ thermal conductivity and water absorption rate with a decrease in their mechanical strength. However, since the application scenarios of TIMs are various, there are significant differences in previous researches, especially the test conditions. These differences limited the applicability of the test results and make a barrier among researchers and engineers. Thus, a unified test method for the durability of TIMs under the CFTs should be established in the future.

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Section: Testing Methodsmentioning

confidence: 99%

Section: Changes In Deformation Properties Of Tims Under Cftsmentioning

confidence: 95%

Section: Changes In Deformation Properties Of Tims Under Cftsmentioning

confidence: 99%

Section: Changes In Deformation Properties Of Tims Under Cftsmentioning

confidence: 99%