Experimental and Numerical Study on the Dynamic Response of a Superthick Backfill Subgrade under High-Speed Railway Loading: A Case Study of Qianjiang–Zhangjiajie–Changde Railway

Wang, Jun; Han, Jianyong; Chen, Juan; Ding, Guangya; Guo-sen, Feng; Liu, Tongjiang; Guo, Bijun

doi:10.1061/(asce)co.1943-7862.0002407

Cited by 14 publications

(9 citation statements)

References 21 publications

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“…e heat absorbed or released per unit mass of PCM in the process of phase transformation is known as the phasechange enthalpy, which is equal to the change in enthalpy of the system in the process of phase transformation in quantity. erefore, the enthalpy of tested sample can be calculated according to equation (2).…”

Section: Calculation Principle Of Enthalpy Dsc Test Is Based Onmentioning

confidence: 99%

“…e melting enthalpy and curing enthalpy of MPCM-LWAC with different MPCM contents were calculated according to (2). As can be seen from Figure 10, the melting enthalpy and curing enthalpy of MPCM-LWAC are positively correlated with the MPCM content.…”

Section: Effect Of Mpcm Content On Enthalpy Of Mpcm-lwac Figures 9(amentioning

confidence: 99%

“…(2) e enthalpy of MPCM-LWAC is positively correlated with the MPCM content. Outside the phasechange temperature range, the specific heat capacity of MPCM-LWAC does not change with the change of temperature, but inside the phase-change temperature range, the specific heat capacity of MPCM-LWAC changes greatly with the change of temperature.…”

mentioning

confidence: 94%

“…Particularly, the construction sector alone accounts for approximately 30% of the total energy consumption. Energy used for refrigeration and heating to maintain indoor comfort temperature is one of the major parts of building energy consumption [1,2]. e use of fossil fuels to maintain indoor comfort temperature increases the emission of harmful gases.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical and Thermal Properties of Shale Ceramsite Concrete: Experimental Study on the Influence Law due to Microencapsulated Phase‐Change Material Content and Phase‐Change Cycle Numbers

Ding

Zhu

et al. 2022

Advances in Civil Engineering

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The addition of microencapsulated phase-change materials (MPCM) to concrete will inevitably cause changes in the mechanical and thermal properties of concrete, and this is vitally important for the safety and energy saving of concrete building components. In this research, shale ceramsite and shale ceramics sand were used as the main raw materials to produce lightweight aggregate concrete (LWAC) mixed with MPCM. In order to investigate the effect of MPCM content and phase-change cycle numbers on the mechanical and thermal properties of MPCM-LWAC, two groups of MPCM-LWAC specimens were prepared. One group consists of specimens containing 2.5%, 5.0%, 7.5%, and 10% MPCM, respectively, and they are used to reveal the change law of tensile strength, compressive strength, enthalpy, and specific heat capacity of LWAC integrated into MPCM. The other group includes specimens with the same MPCM content, but the specimens are subjected to different phase-change cycle numbers of 50, 100, 150, and 200 at the environment temperature of −10–60°C to study the thermal properties of MPCM-LWAC. Findings from the experimental results include the following: (1)The tensile and compressive strengths of MPCM-LWAC concrete are negatively correlated with the MPCM content, while the enthalpy and specific heat capacity are positively correlated with the MPCM content. When the MPCM content reaches 10%, the compressive and tensile strengths of MPCM-LWAC decreased, respectively, by 45.49% and 52.63% than the LWAC without MPCM. (2) Under heating and curing condition, the corresponding maximum specific heat capacity of LWAC with 10% MPCM is 328.35% and 249.50% higher than the LWAC without MPCM, respectively, and the average specific heat capacities increase 71.21% and 44.94%, respectively. (3) The melting enthalpy of MPCM-LWAC is slightly larger than the curing enthalpy, and the difference is more noticeable with the increase of MPCM content. In addition, when the number of phase-change cycle is below 200, the compressive strength and splitting tensile strength of MPCM-LWAC decrease by less than 5%, and the specific heat capacity decreases by less than 1.33%. Hence, it concludes that shale ceramsite concrete with MPCM has promising application prospects.

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Section: Calculation Principle Of Enthalpy Dsc Test Is Based Onmentioning

confidence: 99%

Section: Effect Of Mpcm Content On Enthalpy Of Mpcm-lwac Figures 9(amentioning

confidence: 99%

mentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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Mechanical and Thermal Properties of Shale Ceramsite Concrete: Experimental Study on the Influence Law due to Microencapsulated Phase‐Change Material Content and Phase‐Change Cycle Numbers

Ding

Zhu

et al. 2022

Advances in Civil Engineering

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“…Currently, concrete is the most commonly used building material, of which deformation and cracks are affected by the construction method [1][2][3][4]. As a winter concrete heating and curing method, the local high temperature provided by the electric heating system influences the overall structural performance of the concrete, which results in obvious cracks on the surface after the concrete is hardened [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Coupled Analysis of Thermofluid-Structure Field for Thermal Properties of Early-Age Concrete Influenced by Electric Heating System

et al. 2022

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When heat energy is transferred to concrete through energy conversion by an electric heating system, the overall thermal performance of the early-age concrete is affected by the local high temperature of the concrete. This, in turn, affects the accuracy of the prediction and calculation of concrete deformation. Concrete thermal physical parameter models considering the mutual influence of heat and humidity were established to clarify the influence of an electric heat tracing system on the heat transfer performance of concrete at an early age, based on the concepts of equivalent age and hydration degree. Additionally, the COMSOL numerical simulation software was used for realizing the numerical solution of concrete heat transfer. The research indicates that the degree of hydration is affected by the heating provided by the electric heat tracing system. When curing for 40 h, the degree of hydration approaches 0.82 and remains unchanged, which indicates that the hydration of cement was almost complete in less than 2 days. The specific heat value of concrete in the early stage was significantly affected by electric heat tracing. This value of concrete at a high initial temperature was larger than that at a low temperature, while the specific heat of each point in the later stage tended to be the same. The thermal conductivity was significantly affected by the local electrical heating. The higher the temperature was, the lower the thermal conductivity was, which remained stable for two days under the influence of temperature. The key contribution of this research is to provide a coupling model for concrete curing. The findings from the study also provide industry practitioners with a comprehensive guide regarding the specific applications of the electric heating system in early-age concrete curing.

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Numerical simulation for vibration-induced settlement and permanent deformation accumulation in permafrost subgrades of the Qinghai-Tibet Railway

Tang,

Zhu,

et al. 2024

Computers and Geotechnics

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Experimental and Numerical Study on the Dynamic Response of a Superthick Backfill Subgrade under High-Speed Railway Loading: A Case Study of Qianjiang–Zhangjiajie–Changde Railway

Cited by 14 publications

References 21 publications

Mechanical and Thermal Properties of Shale Ceramsite Concrete: Experimental Study on the Influence Law due to Microencapsulated Phase‐Change Material Content and Phase‐Change Cycle Numbers

Mechanical and Thermal Properties of Shale Ceramsite Concrete: Experimental Study on the Influence Law due to Microencapsulated Phase‐Change Material Content and Phase‐Change Cycle Numbers

Coupled Analysis of Thermofluid-Structure Field for Thermal Properties of Early-Age Concrete Influenced by Electric Heating System

Numerical simulation for vibration-induced settlement and permanent deformation accumulation in permafrost subgrades of the Qinghai-Tibet Railway

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