Assessment of Freeze-Thaw Cycles Impact on Flexural Tensile Characteristics of Asphalt Mixture in Cold Regions

Duojie, Cidan; Si, Wei; Ma, Biao; Hu, Yanjia; Xue, Liu; Wang, Xintong

doi:10.1155/2021/6697693

Cited by 14 publications

(9 citation statements)

References 19 publications

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“…Every spring, yellow sand fills the sky, the air is turbid, dust and sandstorms often occur, and the dust content in the air far exceeds the national regulations, which not only causes respiratory diseases but also affects travel safety. Therefore, the problem of desertification requires urgent need of treatment [ 10 ]. Many scholars at home and abroad have carried out applied research on it.…”

Section: Literature Reviewmentioning

confidence: 99%

Effect of Aeolian Sand Powder Addition on Frost Resistance of Concrete Pavement

Zhao

Deng

2022

International Journal of Analytical Chemistry

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In order to solve the problem of exploring the freeze-thaw characteristics of modified aeolian sand mixed with cement and silt, the authors propose a freeze-thaw cycle test of modified aeolian sand under the condition of mixing 5% cement and silt with different contents. In this experiment, under freeze-thaw conditions, its intensity decay and mass volume change law and the changes of freeze-thaw characteristics were comprehensively characterized by multiple indicators. The result shows that, after two freeze-thaw cycles, the compressive strength and peak strain of the improved aeolian sand were positively correlated with the silt content. With the increase of the number of freeze-thaw cycles, the compressive and antidestruction capacity of the improved aeolian sand with high silt content and low silt content decreased significantly. 15% silt content improves the structural stability of aeolian sand. It is proved that the authors’ experiment can intuitively and effectively reflect the change law of soil strength after freezing and thawing of such improved aeolian sandy soil, which has displayed significance.

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Section: Literature Reviewmentioning

confidence: 99%

Effect of Aeolian Sand Powder Addition on Frost Resistance of Concrete Pavement

Zhao

Deng

2022

International Journal of Analytical Chemistry

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“…The second stage is the main stage of material fatigue damage. The test specimen produces fatigue damage under the action of alternating load, and this stage is the initiation and development process of microcracks [ 39 ].…”

Section: Resultsmentioning

confidence: 99%

Investigation on Fatigue Performance of Diatomite/Basalt Fiber Composite Modified Asphalt Mixture

et al. 2022

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The fatigue resistance of asphalt mixture is an important indicator to evaluate the durability of asphalt pavement. In order to improve the fatigue properties of asphalt mixture, diatomite and environmental basalt fiber were added. Four types of asphalt mixtures, ordinary asphalt mixture (AM), diatomite modified asphalt mixture (DAM), basalt fiber modified asphalt mixture (BFAM) and diatomite/basalt fiber composite modified asphalt mixture (DBFAM), were chosen, whose optimum asphalt–aggregate ratio, optimum content of diatomite and optimum content of basalt fiber could be determined by Marshall test and response surface methodology (RSM). The multi-functional pneumatic servo Cooper test machine was carried out by a four-point bending fatigue test. Through the comparative analysis of flexural-tensile stiffness modulus (S), initial stiffness modulus(S0), residual stiffness modulus ratio, lag angle (ϕ) and cumulative dissipation energy (ECD), the fatigue resistance of asphalt mixture can be effectively improved by adding diatomite and basalt fiber. Grey correlation analysis was also used to analyze the degree of correlation between the fatigue life and the influencing factors such as VV, VMA, VFA, OAC, S, and ECD. The analysis results indicate that ECD has the greatest impact on the fatigue life of the asphalt mixture.

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“…The HFM is helpful to select the right performance grading of an asphalt binder according to the climatic condition in the area of uses. In permafrost regions, asphalt pavement is preferred because its flexible properties are advantageously adapted to differential settlement that is caused by the warming of the underlying frozen soils 29 . Asphalt pavement is typically placed on the top of an embankment.…”

Section: Discussionmentioning

confidence: 99%

A heat-flux upper boundary for modeling temperature of soils under an embankment in permafrost region

Wang

Li-e

2022

Sci Rep

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Building roads in permafrost region is challenged because permafrost is sensitive to temperature increase. As an embankment gains/drains heat mostly at the upper surface, accurately modeling the heat transfer in the upper surface is crucial to understand the thermal stability of the road. Popular methods treat the upper boundary as a temperature-controlled model (TCM), where temperature of the upper surface is set as a sinusoidal function. This simple function, however, fails to identify the influences of solar irradiance, heat convection, and thermal irradiance on the heat transfer on the ground surface. Here we introduce a heat-flux model (HFM) to calculate the heat fluxes at the embankment upper surface and at the adjacent ground surface. HFM-predicted temperature under an embankment is compared against the observed temperature to validate the model, and is compared to the TCM-predicted temperature. While TCM-predicted temperatures and HFM-predicted ones are similar in trend and in pattern, the HFM-predicted temperatures are far more coincident with the observed ones. The pros and cons of both HFM and TCM are discussed. Further studies are expected to use HFM to understand the heat flux components such as solar absorption, heat convection, and thermal irradiance on the temperature of permafrost under embankments.

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Assessment of Freeze-Thaw Cycles Impact on Flexural Tensile Characteristics of Asphalt Mixture in Cold Regions

Cited by 14 publications

References 19 publications

Effect of Aeolian Sand Powder Addition on Frost Resistance of Concrete Pavement

Effect of Aeolian Sand Powder Addition on Frost Resistance of Concrete Pavement

Investigation on Fatigue Performance of Diatomite/Basalt Fiber Composite Modified Asphalt Mixture

A heat-flux upper boundary for modeling temperature of soils under an embankment in permafrost region

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