scholarly journals Fly Ash/Paraffin Composite Phase Change Material Used to Treat Thermal and Mechanical Properties of Expansive Soil in Cold Regions

2022 ◽  
Vol 10 (4) ◽  
pp. 1153-1173
Author(s):  
Yong Chen ◽  
Yinghao Huang ◽  
Min Wu and Shuo Wang
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Phase Change ◽  
Phase Change Material ◽  
Expansive Soil ◽  
Thermal And Mechanical Properties ◽  
Cold Regions ◽  
Composite Phase Change Material ◽  
Change Material

scholarly journals Freeze-thaw Performance of Phase Change Material (PCM) Incorporated Canal Foundation Expansive Soil

2021 ◽  
Author(s):  
Yong Chen ◽  
Yinghao Huang ◽  
Shuo Wang ◽  
Rui Zhu ◽  
Xiaohan Liu
Keyword(s):  
Mechanical Properties ◽  
Phase Change ◽  
Phase Change Material ◽  
Expansive Soil ◽  
Volume Deformation ◽  
Foundation Soil ◽  
Cold Regions ◽  
Freeze Thaw ◽  
Change Material ◽  
Modified Soil

Abstract Drought and water shortages severely restrict the development of agriculture in China. The complex process of freezing and thawing experienced by the canal foundation soil in cold regions will cause leakage and loss of canal water. It is a common measure to improve the foundation soil of canals in cold regions. Phase change material (PCM) store or release heat in the form of latent heat during the phase change process, which is a new type of temperature control material. In this study, PCM-modified soil was used as the research object. Volume deformation measurement, unconfined compressive strength test, differential scanning calorimetry, and scanning electron microscopy tests were carried out on modified soil samples with different PCM content after freeze-thaw (F-T) cycles. The influence of the number of F-T cycles and the content of PCM on the expansion-shrinkage deformation and mechanical properties of the modified soil was revealed. The results show that: the greater the PCM content, the smaller the volume change, but there will be an optimal mixing ratio. The stress-strain curve characteristics, the failure strain with the number of F-T cycles and the PCM content have a great relationship. The effects of F-T cycles have a greater impact on the mechanical properties of PCM-modified soil. Among them, the first cycle is the most obvious, and it stabilizes after the third cycle. PCM can inhibit the attenuation of soil strength, and the greater the amount, the better the effect. The freezing time of PCM-modified soil has been increased, the supercooling phenomenon is no longer obvious, and the thermal stability has been improved. PCM reduces the connectivity of pores, and macroscopically suppresses the expansion and shrinkage characteristics and strength attenuation of expansive soil. The studies have shown that 8% PCM-modified soil has obvious advantages in resisting the harsh weather in cold regions, which can provide a reference for actual engineering design.

Elaboration of a composite material based on plaster reinforced with phase change material/Oakum Fiber: physical, thermal and mechanical properties.

2021 ◽  
Vol 35 ◽  
pp. 102321
Author(s):  
Oumayma M'ghari ◽  
Fatima‐Zahra Semlali Aouragh Hassani ◽  
Mohamed El Mehdi Mekhzoum ◽  
Nadia Zari ◽  
Rachid Bouhfid ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Composite Material ◽  
Phase Change ◽  
Phase Change Material ◽  
Thermal And Mechanical Properties ◽  
Change Material
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