Influence of the Freeze-Thaw Cycles on the Physical and Mechanical Properties of Granites

Martins, Lurdes; Vasconcelos, Graça; Lourénço, Paulo B.; Palha, Carlos Alberto Oliveira Fernandes

doi:10.1061/(asce)mt.1943-5533.0001488

Cited by 30 publications

(17 citation statements)

References 23 publications

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“…The dynamic conditions consist of relative humidity (RH), temperature, potential, freeze/thaw, or start/stop [35]. The crucial conditions for transportation requirements are dynamic load cycling, startup-shutdown, and freeze-thaw [36].…”

Section: Degradation Diagnoses Using Accelerated Stress Test (Ast) Prmentioning

confidence: 99%

Hydrogen Fuel Cell Implementation for the Transportation Sector

Yeetsorn¹,

Maiket²

2021

Advanced Applications of Hydrogen and Engineering Systems in the Automotive Industry

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Global transportation possesses have compelling rationales for reducing the consumption of oil, emissions of carbon dioxide, and noise pollution. Transitions to alternative transportation technologies such as electric vehicles (EVs) have gained increased attention from the automotive industries. A fuel cell electric vehicle (FCEV) occupying a hydrogen engine is one of the most stupendous technologies, since it is suitable for a large-scale transportation. However, its performance limitations are in question due to voltage degradation in long term operations through steady conditions under constant load and dynamic working conditions. Other drawbacks of using fuel cells in EVs are energy balances and management issues necessary for vehicle power and energy requirements. An efficient solution to accommodate driving behavior like dynamic loads comprises of hybridizing PEMFCs with energy storage devices like supercapacitors and batteries. This opening chapter reviews the projected gist of FCEV status; considers the factors that are going to affect how FCEVs could enter commercialization, including the importance of fuel cells for EV technologies; the degradation diagnoses using accelerated stress test (AST) procedures; FCEV hybridization; and the contribution of an energy storage device for charging EVs. The article also addresses case studies relating to material degradation occurring from driving behavior. Information about material degradation can be compiled into a database for the improvement of cell component performance and durability, leading to the creation of new materials and new fuel cell hybridization designs. To support the growth of EV technologies, an energy storage is required for the integrated alternative electricity generations. A redox flow battery is considered as a promising candidate in terms of attractive charging station for EVs or HEVs.

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Section: Degradation Diagnoses Using Accelerated Stress Test (Ast) Prmentioning

confidence: 99%

Hydrogen Fuel Cell Implementation for the Transportation Sector

Yeetsorn¹,

Maiket²

2021

Advanced Applications of Hydrogen and Engineering Systems in the Automotive Industry

View full text Add to dashboard Cite

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“…Most common are the determination of weight, and measuring porosity and apparent density through water absorption (e.g. Martins et al, 2016). Often, the pore-size distribution is found through mercury intrusion porosimetry (MIP) (Abell et al, 1999;Diamond, 2000).…”

Section: Steady State Evaluationmentioning

confidence: 99%

A review on freeze-thaw action and weathering of rocks

Deprez

Kock

Schutter

et al. 2020

Earth-Science Reviews

170

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“…Weng [32] et al studied the response mechanism of the rock microstructure and dynamic mechanical behaviour to freeze-thaw weathering cycles. Martins [33] studied the influence of freeze-thaw weathering cycles on the physical and mechanical properties of granite. Huang [34,35] constructed a constitutive model of rock damage under freeze-thaw and load conditions, as well as the thermal-hydraulic-mechanical (THM) coupling control equation of frozen rock under low-temperature conditions, and achieved good prediction results.…”

Section: Introductionmentioning

confidence: 99%

Research on the Pore Evolution of Sandstone in Cold Regions under Freeze-Thaw Weathering Cycles Based on NMR

et al. 2020

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The evolution of the rock pore structure is an important factor influencing rock mechanical properties in cold regions. To study the mesoscopic evolution law of the rock pore structure under freeze-thaw weathering cycles, a freeze-thaw weathering cycle experiment was performed on red sandstone from the cold region of western China with temperatures ranging from -20°C to +20°C. The porosity, T2 spectral distribution, and magnetic resonance imaging (MRI) characteristics of the red sandstone after 0, 20, 40, 60, 80, 100, and 120 freeze-thaw weathering cycles were measured by the nondestructive detection technique nuclear magnetic resonance (NMR). The results show that the porosity of sandstone decreases first and then increases with the increase of the freeze-thaw weathering cycles and reaches the minimum at 60 of freeze-thaw weathering cycles. The evolution characteristics of porosity can be divided into three stages, namely, the abrupt decrease in porosity, the slow decrease in porosity, and the steady increase in porosity. The evolution characteristics of the T2 spectrum distribution, movable fluid porosity (MFP), and MRI images in response to the freeze-thaw weathering process are positively correlated with the porosity. Analysis of the experimental data reveals that the decrease in the porosity of the red sandstone is mainly governed by mesopores, which is related to the water swelling phenomenon of montmorillonite. Hence, the pore connectivity decreases. As the number of freeze-thaw cycles increases, the effect of the hydrophysical reaction on the porosity gradually disappears, and the frost heaving effect caused by the water-ice phase transition gradually dominates the pore evolution law of red sandstone.

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Influence of the Freeze-Thaw Cycles on the Physical and Mechanical Properties of Granites

Abstract: granite presents values significantly higher after the cycles of freeze-thaw, which also leads to the increased on the absorption by immersion and capillary absorption coefficient.

Cited by 30 publications

References 23 publications

Hydrogen Fuel Cell Implementation for the Transportation Sector

Hydrogen Fuel Cell Implementation for the Transportation Sector

A review on freeze-thaw action and weathering of rocks

Research on the Pore Evolution of Sandstone in Cold Regions under Freeze-Thaw Weathering Cycles Based on NMR

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