Numerical simulation of pore structure and heat transfer behavior in aerated concrete

Zhao, Zhiguang; Qu, Xuecheng; Pang, Jun; Yang, Xingshuo; Wen, Huiying; Yu, Chaocheng; Chen, Chang; Tian, Changan; Zhao, Sanyin

doi:10.1016/j.conbuildmat.2022.129934

Cited by 4 publications

(4 citation statements)

References 37 publications

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“…It can be seen in the figure that regardless of the change in density, k 2 /k 1 is always close to 1, indicating that the contribution of convective heat transfer in actual foam concrete is very small. This is due to the pore size of foam concrete being less than 1 mm, which restricts the convective effect of the gas in the pores [40].…”

Section: Conduction and Convection Coupled Heat Transfer Analysismentioning

confidence: 99%

“…It can be seen in the figure that regardless of the change in density, 𝑘 2 /𝑘 1 is always close to 1, indicating that the contribution of convective heat transfer in actual foam concrete is very small. This is due to the pore size of foam concrete being less than 1 mm, which restricts the convective effect of the gas in the pores [40]. Related studies have shown that the influence of convective heat transfer needs to be considered only when the pore size of the porous medium is greater than 4 mm.…”

Section: Conduction and Convection Coupled Heat Transfer Analysismentioning

confidence: 99%

“…As the main mechanism of heat transfer is thermal conduction, most studies currently focus on the description of thermophysical properties generated by conductive transmission [39,40]. Some of the studies have found that the underestimation of the equivalent thermal conductivity may be due to the neglect of radiation, and related studies indicate that the contribution of radiation accounts for 6-30% of the overall equivalent thermal conductivity [37,39,41].…”

Section: Introductionmentioning

confidence: 99%

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Study on the Coupled Heat Transfer of Conduction, Convection, and Radiation in Foam Concrete Based on a Microstructure Numerical Model

Huang,

Wang,

Feng

et al. 2024

Buildings

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Foam concrete is a typical cement-based porous material; its special microstructure endows it with excellent properties, such as light weight, energy efficiency, thermal insulation, and fire resistance. Therefore, it is widely used as a thermal insulation material for buildings. The heat transfer modes of foam concrete include conduction, convection, and radiation. However, previous studies considered conduction to be the dominant mode, often neglecting the effects of convection and radiation. In this study, a stochastic numerical model of the foam concrete microstructure is established based on the statistical parameters of the pore structure. With this model, the heat transfer mechanism of foam concrete is analyzed at the mesoscopic level, and the equivalent thermal conductivity is calculated. By comparing four different working conditions, the influence of conduction, convection, and radiation on the heat transfer of foam concrete is analyzed, and the specific contribution rates of conduction, convection, and radiation are calculated. The results show that the convection effect is weak due to the pore size being smaller than 1 ; so, the influence of convection can be neglected in the heat transfer analysis of foam concrete. The contribution of radiation increases with the decrease in foam concrete density and the increase in temperature difference. When the temperature difference is 40 and the density is 300 , the contribution of radiation exceeds 20. Therefore, for low-density and high-temperature difference situations, the influence of radiation cannot be ignored. The heat transfer in foam concrete is mainly through conduction, but with the decrease in density and the increase in temperature difference, the contribution of conduction shows a downward trend. Nevertheless, the contribution of conduction is still much larger than that of radiation and convection.

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Section: Conduction and Convection Coupled Heat Transfer Analysismentioning

confidence: 99%

Section: Conduction and Convection Coupled Heat Transfer Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Study on the Coupled Heat Transfer of Conduction, Convection, and Radiation in Foam Concrete Based on a Microstructure Numerical Model

Huang,

Wang,

Feng

et al. 2024

Buildings

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“…When the density of the samples was low, cracks frequently occurred due to shrinkage. The cracks were often connective, which caused high heat convection and increased the thermal conductivity of the samples [50,51]. However, when a modified nanopore-forming agent (O-MMT) was used, the shrinkage value of the low-density sample significantly decreased, contributing to reducing cracks.…”

Section: Fundamental Performancementioning

confidence: 99%

Shrinkage Reduction in Nanopore-Rich Cement Paste Based on Facile Organic Modification of Montmorillonite

Yang,

Chen

et al. 2024

Materials

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The organic modification of montmorillonite was successfully achieved using cetyltrimethyl ammonium bromide under facile conditions. The modified montmorillonite was subsequently used for the fabrication of montmorillonite-induced nanopore-rich cement paste (MNCP), and the shrinkage behavior and fundamental performance of MNCP were also investigated. The results indicate that alkali cations on a montmorillonite layer surface were exchanged by using CTAB under 80 °C, successfully achieving the organic modification of montmorillonite. As a pore-forming agent, the modified montmorillonite caused a reduction in shrinkage: the 28-day autogenous shrinkage at a design density of 400 kg/m3 and 800 kg/m3 was reduced to 2.05 mm/m and 0.24 mm/m, and the highest reduction percentages during the 28-day drying shrinkage were 68.1% and 62.2%, respectively. The enlarged interlamellar pores and hydrophobic effects caused by the organic modification of montmorillonite aided this process. Organic-modified montmorillonite had a minor influence on dry density and thermal conductivity and could contribute to an enhancement of strength in MNCP.

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Preparation of eco-friendly functional lightweight gypsum: Effect of three different lightweight aggregates

Jin¹,

Cui²,

Wan³

et al. 2023

Construction and Building Materials

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Numerical simulation of pore structure and heat transfer behavior in aerated concrete

Cited by 4 publications

References 37 publications

Study on the Coupled Heat Transfer of Conduction, Convection, and Radiation in Foam Concrete Based on a Microstructure Numerical Model

Study on the Coupled Heat Transfer of Conduction, Convection, and Radiation in Foam Concrete Based on a Microstructure Numerical Model

Shrinkage Reduction in Nanopore-Rich Cement Paste Based on Facile Organic Modification of Montmorillonite

Preparation of eco-friendly functional lightweight gypsum: Effect of three different lightweight aggregates

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