水泥胶结钙质砂热传导特性及微观机制

曾召田; 付慧丽; 吕海波; 梁珍; 于海浩

doi:10.11779/CJGE202112021

水泥胶结钙质砂热传导特性及微观机制 English Version

曾召田^1,,
付慧丽^{1, 2},
吕海波^{1, 3, ,},
梁珍¹,
于海浩¹

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.
中国建筑西南勘察设计研究院有限公司,四川　成都　610051
3.
贺州学院建筑与电气工程学院,广西　贺州　542899

基金项目:

国家自然科学基金项目 42167020

国家自然科学基金项目 41962014

广西自然科学基金项目 2018GXNSFAA138182

广西自然科学基金项目 2018GXNSFDA281038

广西自然科学基金项目 GXNSFGA380004

广西科技基地和人才专项桂科D20325010

详细信息

作者简介:
曾召田(1981— ),男,博士,教授,主要从事环境岩土工程专业研究。E-mail：zengzhaotian@163.com

通讯作者:
吕海波, E-mail：lhb@glut.edu.cn

中图分类号: TU443
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出版历程
- 收稿日期: 2020-11-30
- 网络出版日期: 2022-11-30
- 刊出日期: 2021-11-30

Thermal conduction characteristics and microcosmic mechanism of cement-cemented calcareous sand

ZENG Zhao-tian^1,,
FU Hui-li^{1, 2},
LÜ Hai-bo^{1, 3, ,},
LIANG Zhen¹,
YU Hai-hao¹

1.
Guangxi Key Laboratory of Geotechnical Mechanics and Engineering, Guilin University of Technology, Guilin 541004, China
2.
China Southwest Geotechnical Investigation & Design Institute Co., Ltd., Chengdu 610051, China
3.
School of Architecture and Electrical Engineering, Hezhou University, Hezhou 542899, China

摘要

摘要: 南海岛礁建设中,钙质砂地基面临的高温环境问题需要全面掌握钙质砂热传导性能的演变规律。基于热探针法测定了不同试验条件下水泥胶结钙质砂的导热系数 $λ$ ,探讨了水灰比W/C、养护时间t、胶结程度（水泥掺量P_s）、含水率w等因素对其产生的影响规律,发现水泥胶结钙质砂的导热系数 $λ$ 随养护龄期t的增加呈现出先急剧增大而后缓慢减小的变化规律,随水泥掺量P_s、含水率w的增加而递增,随水灰比W/C的增加反而递减；在此基础上,利用电镜扫描和压汞试验从微观角度解释了水泥胶结钙质砂导热系数随胶结程度的变化趋势：水泥胶结钙质砂内微孔隙大小、数量的变化从本质上决定了其宏观热传导特性,凝胶状水化产物连续填充其内部孔隙,引起其孔隙率降低,改善砂样内部传热,宏观表现为其导热系数λ随着胶结程度的增加而递增。
- 水泥胶结钙质砂 /
- 热传导特性 /
- 微观机制 /
- 扫描电镜 /
- 压汞试验
Abstract: In the construction of islands and reefs in the South China Sea, the high-temperature environment problem of calcareous sand foundation requires a comprehensive understanding of the evolution laws of calcareous sand thermal conductivity. Based on the thermal probe method, the thermal conductivity of cement-cemented calcareous sand under different test conditions is determined, and the variation laws of the influence factors such as water-cement ratio, curing period, cementing degree (cement content) and moisture content on the thermal conductivity are discussed. It is found that the thermal conductivity of the cement-cemented calcareous sand increases sharply firstly and then decreases slowly with the increasing curing period. At the same time, the thermal conductivity increases with the increase of the cement content and moisture content, and decreases with the increase of the water cement ratio. On this basis, the trend of thermal conductivity of the cement-cemented calcareous sand with the degree of cementation is explained by the scanning electron microscope and mercury intrusion porosimetry tests. The result shows that the macroscopic thermal conduction characteristics of the cement-cemented sand are determined by the variation of size and quantity of its micro-pores. The gelatinous hydration products continuously fill the internal pores of cemented sand, causing a reduction in porosity and improving the internal heat transfer of the sand sample. At the macro level, the thermal conductivity increases with the degree of cementation.
- cement-cemented calcareous sand /
- thermal conduction characteristic /
- microcosmic mechanism /
- scanning electron microscope /
- mercury intrusion porosimetry test

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图 1 钙质砂样

Figure 1. Calcareous sand

下载: 全尺寸图片幻灯片

图 2 水泥胶结钙质砂导热系数随养护时间的变化曲线

Figure 2. Variation curves of thermal conductivity of cement -cemented calcareous sand with curing time

下载: 全尺寸图片幻灯片

图 3 水泥胶结钙质砂水化过程示意图

Figure 3. Diagram of hydration process of cement-cemented calcareous sand

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图 4 水泥胶结钙质砂导热系数随水泥掺量的变化曲线

Figure 4. Variation curves of thermal conductivity of cement-cemented calcareous sand with cement content

下载: 全尺寸图片幻灯片

图 5 不同水灰比的水泥胶结钙质砂导热系数对比分析

Figure 5. Comparative analysis of thermal conductivity of cement -cemented calcareous sand with different water-cement ratios

下载: 全尺寸图片幻灯片

图 6 水泥胶结钙质砂导热系数随含水率的变化曲线

Figure 6. Variation curves of thermal conductivity of cement-cemented calcareous sand with water content

下载: 全尺寸图片幻灯片

图 7 电镜扫描图像（×200）

Figure 7. Scanning images of electron microscope（×200）

下载: 全尺寸图片幻灯片

图 8 水泥胶结钙质砂电镜扫描图像（×2000,P_s=10%）

Figure 8. Scanning image of electron microscope of cement-cemented calcareous sand（×2000,P_s=10%）

下载: 全尺寸图片幻灯片

图 9 胶结钙质砂孔隙孔径分布曲线

Figure 9. Pore-size distribution curves of cemented calcareous sand

下载: 全尺寸图片幻灯片

表 1 钙质砂的基本物理性质指标

Table 1 Basic physical properties of calcareous sand

G_s	最小干密度ρ_dmin/(g·cm^-3)	最大干密度ρ_dmax/(g·cm^-3)	相对密实度D_r	限制粒径d₆₀/mm	有效粒径d₁₀/mm	不均匀系数C_u(d₆₀/d₁₀)	颗粒组成/%
G_s	最小干密度ρ_dmin/(g·cm^-3)	最大干密度ρ_dmax/(g·cm^-3)	相对密实度D_r	限制粒径d₆₀/mm	有效粒径d₁₀/mm	不均匀系数C_u(d₆₀/d₁₀)	<0.075 mm	<0.25 mm	<0.5 mm	<1 mm	<2 mm
2.73	1.04	1.39	0.53	0.420	0.138	3.04	2.9	29.8	67.8	94.6	100

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表 2 水泥熟料的主要化学成分

Table 2 Main chemical components of cement clinker

化学成分	CaO	SiO₂	Al₂O₃	Fe₂O₃
含量/%	62~67	20~24	4~7	2.5~6

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表 3 水泥胶结钙质砂样品制备数量

Table 3 Sample numbers of cement-cemented calcareous sand

W/C	P_s=5.0%	P_s=7.5%	P_s=10.0%	P_s=12.5%	P_s=15.0%
0.6	2个	2个	2个	2个	2个
0.9	2个	2个	2个	2个	2个

下载: 导出CSV

表 4 极端含水状态水泥胶结钙质砂导热系数及比值

Table 4 Thermal conductivity and its ratio of cement-cemented calcareous sand under extreme water bearing state

P_s/%	W/C=0.6			W/C=0.9
P_s/%	λ_干燥/(W·m·K^-1)	λ_饱水/(W·m·K^-1)	$\frac{λ_{饱水}}{λ_{干燥}}$	λ_干燥/(W·m·K^-1)	λ_饱水/(W·m·K^-1)	$\frac{λ_{饱水}}{λ_{干燥}}$
5.0	0.345	0.992	2.88	0.315	0.985	3.13
7.5	0.309	0.971	3.14	0.228	0.957	4.20
10.0	0.324	1.013	3.13	0.247	0.972	3.94
12.5	0.298	0.997	3.35	0.221	0.953	4.31
15.0	0.312	1.000	3.21	0.241	0.974	4.04

下载: 导出CSV

表 5 天然钙质砂和水泥胶结钙质砂孔隙统计参数

Table 5 Statistical parameters of pores of natural calcareous sand and cement-cemented calcareous sand

孔隙统计参数		图像面积	总孔隙区域面积	孔隙数量	孔隙占比
天然钙质砂	P_s=0%	714752	239299	264	33.48
水泥胶结钙质砂	P _s =5.0%	714752	54792	69	7.67
	P_s =10.0%	714752	6390	11	0.89
	P_s =15.0%	714752	5349	8	0.75

下载: 导出CSV

表 6 不同水泥掺量胶结钙质砂孔隙结构特征参数统计表

Table 6 Statistical parameters of pores of cement-cemented calcareous sand with different cement contents

水泥掺量 $P_{s}$ /%	总进汞体积/(mL·g^-1)	总孔面积/(m²·g^-1)	孔隙率/%
0.0	0.3970	18.681	51.8218
5.0	0.3513	9.711	46.9556
10.0	0.2901	8.876	39.0809
15.0	0.2231	5.688	30.6353

下载: 导出CSV

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