Thermal conductivity and microstructure analysis of cemented calcareous sand with different cement contents

ZENG Shasha; MO Hongyan; GU Jianxiao; ZENG Zhaotian; FU Huili; LIANG Zhen

doi:10.11835/j.issn.2096-6717.2021.112

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Thermal conductivity and microstructure analysis of cemented calcareous sand with different cement contents

Civil Engineering | 更新时间：2023-07-10

- Thermal conductivity and microstructure analysis of cemented calcareous sand with different cement contents
- Journal of Civil and Environmental Engineering Vol. 45, Issue 4, Pages: 65-73(2023)
- 作者机构：
  
  1.桂林理工大学广西岩土力学与工程重点实验室,广西桂林 541004
  2.温州理工学院建筑与能源工程学院,浙江温州 325027
- 作者简介：
  
  brief: ZENG Shasha (1982- ), main research interest: marine engineering geology, E-mail: zengshasha2016@163.com.
  ZENG Zhaotian （corresponding author）, PhD, professor, E-mail: zengzhaotian@163.com.
- 基金信息：
  
  National Natural Science Foundation of China(41962014);Natural Science Foundation of Guangxi(2018GXNSFAA138182;2018GXNSFDA281038)
- DOI：10.11835/j.issn.2096-6717.2021.112
  CLC： TU411.92
- Received：13 April 2021，
  
  Published：25 August 2023
- 稿件说明：
移动端阅览
ZENG Shasha, MO Hongyan, GU Jianxiao, et al. Thermal conductivity and microstructure analysis of cemented calcareous sand with different cement contents[J]. Journal of Civil and Environmental Engineering, 2023, 45(4): 65-73.
DOI：

ZENG Shasha, MO Hongyan, GU Jianxiao, et al. Thermal conductivity and microstructure analysis of cemented calcareous sand with different cement contents[J]. Journal of Civil and Environmental Engineering, 2023, 45(4): 65-73. DOI： 10.11835/j.issn.2096-6717.2021.112.

摘要

钙质砂的导热性能影响周围土体的传热过程，引起不同环境温度下钙质砂的工程力学性能变化及灾害效应。基于热针法分析5种不同水泥掺量（

=5%、7.5%、10%、12.5%、15%）胶结钙质砂的导热系数变化规律，利用SEM、MIP、NMR技术综合揭示该过程中胶结钙质砂微观孔隙结构变化的本质特征，在此基础上阐释热特性演化的微观机理。试验结果表明：胶结钙质砂的导热系数

随水泥掺量

的增大而递增，

小于10%时，

呈线性递增，

大于10%时，

增长缓慢；随着水泥掺量

的增大，胶结钙质砂中孔隙数量越来越少，孔隙占比下降明显，但

增大到10%后，总孔隙面积、孔隙数量、孔隙率等微孔隙结构参数变化减缓；不同水泥掺量胶结钙质砂的导热系数

与其微观孔隙结构变化呈负相关关系，本质原因在于凝胶状的水泥水化产物连续填充了胶结钙质砂孔隙，降低了其孔隙率，改善了砂样内部传热，宏观表现为其导热系数

随水泥掺量

的增大而增大。

Abstract

The thermal conductivity of calcareous sand affects the heat transfer process of the surrounding soil and causes the change of engineering mechanical properties and disaster effects of calcareous sand at different ambient temperatures. The variation law of thermal conductivity of cemented calcareous sand with five different cement contents (

=5%

7.5%

10%

12.5%

15%) was analyzed based on hot needle method. SEM

MIP and NMR were used to comprehensively reveal the essential characteristics of micro-pore structure changes of cemented calcareous sand during the process above. On this basis

the microcosmic mechanism of the evolution of the thermal characteristics above was explained. The results show that the thermal conductivity (

) of cemented calcareous sand increases with the increase of cement content (

). When

is less than 10%

increases linearly

and when

is more than 10%

increases slowly. With the increase of cement content (

)

the number of pores in the cemented calcareous sand becomes less

and the proportion of pores decreases obviously. However

when

increases up to 10%

the change of micro-pore structure parameters such as total pore area

pore number and porosity stabilizes. The thermal conductivity (

) of cemented calcareous sand with different cement contents is negatively correlated with the changes of their microscopic pore structure. The reason lies in that the gel-like cement hydration products continuously fill the pores of cemented calcareous sand

reducing its porosity and improving the heat transfer inside the sand sample. The macroscopic performance is that its thermal conductivity (

) increases with the increase of cement content (

关键词

Keywords

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