正十四烷/石墨低温相变水泥基材料的制备及冻融损伤演化

于本田; 陈延飞; 李双洋; 杨玉祥; 胡柏春; 刘涛

doi:10.13801/j.cnki.fhclxb.20211110.002

正十四烷/石墨低温相变水泥基材料的制备及冻融损伤演化

doi: 10.13801/j.cnki.fhclxb.20211110.002

于本田^{1, 2, 3, ,},
陈延飞^1,,
李双洋⁴,
杨玉祥¹,
胡柏春⁵,
刘涛⁵

1.
兰州交通大学　土木工程学院，兰州 730070
2.
中铁十四局集团有限公司，济南 250014
3.
西南交通大学　土木工程学院，成都 610031
4.
中国科学院西北生态环境资源研究院　冻土工程国家重点实验室，兰州 730000
5.
中国电建集团贵阳勘测设计研究院有限公司，贵阳 550081

基金项目: 中国科学院重点部署项目(ZDRW-ZS-2020-1)；中国铁路总公司科技研究开发计划 (P2018G004)

详细信息

通讯作者:
于本田，博士，副教授，硕士生导师，研究方向为水泥混凝土材料与结构　 E-mail: yubentian@mail.lzjtu.cn

中图分类号: TU528
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出版历程
- 收稿日期: 2021-08-17
- 修回日期: 2021-10-30
- 录用日期: 2021-11-01
- 网络出版日期: 2021-11-11
- 刊出日期: 2022-06-01

Preparation and freeze-thaw damage evolution of n-tetradecane/graphite low-temperature phase change cement-based materials

YU Bentian^{1, 2, 3
, ,},
CHEN Yanfei^1
,,
LI Shuangyang⁴,
YANG Yuxiang¹,
HU Baichun⁵,
LIU Tao⁵

1.
School of Civil Engineering, Lanzhou Jiao tong University, Lanzhou 730070, China
2.
China Railway 14th Bureau Group Co. Ltd., Jinan 250014, China
3.
School of Civil Engineering, Southwest Jiao tong University, Chengdu 610031, China
4.
State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
5.
Power China Guiyang Engineering Corporation Limited, Guiyang 550081, China

摘要

摘要: 以正十四烷(C14)为相变材料，膨胀石墨(EG)为载体，通过物理吸附法制备C14/EG复合相变材料，采用SEM、DSC、FTIR对C14/EG复合相变材料的微观形貌、相变温度、相变潜热、化学结构进行了测试。开展了外掺(与水泥质量比)0%、2%、4%、6%相变材料的相变储能水泥基材料(PCESM)快速冻融循环试验，分析了冻融循环对表面损伤、质量损失、动弹模量损失、抗压强度及孔结构的影响规律，揭示了PCESM冻融循环劣化机制。试验结果表明：C14能够较好地吸附在EG孔隙中，C14与EG之间有良好的相容性，二者未发生化学反应。由于C14/EG相较于水泥基材料为弱相，因此随着C14/EG相变材料掺量的提高，PCESM的力学性能随之下降，但抗冻性能随着C14/EG相变材料掺量的提高呈现先提高后降低的规律，C14/EG相变材料掺量为4%的PCESM抗冻性最优。
- 相变材料 /
- 相变储能水泥基材料 /
- 力学性能 /
- 冻融循环 /
- 孔结构 /
- 损伤
Abstract: C14/EG composite phase change material was prepared by physical adsorption method with n-tetradecane (C14) as phase change material and expanded graphite (EG) as carrier. The micro-morphology, phase change temperature, phase change latent heat and chemical structure of C14/EG composite phase change material were tested by SEM, DSC and FTIR. The quick freeze-thaw cycle tests of phase change energy storage cement-based materials (PCESM) doped (mass ratio to cement) with 0%, 2%, 4% and 6% phase change materials were carried out. The effects of freeze-thaw cycle on the surface damage, mass loss, dynamic modulus loss, compressive strength and pore structure were analyzed, and the deterioration mechanism of PCESM during freeze-thaw cycle was revealed. The experimental results show that C14 can be well adsorbed in the pores of EG, and C14 has good compatibility with EG, and there is no chemical reaction between them. With the increase of C14/EG phase change material content, the porosity increases and the mechanical properties decrease, but the frost resistance increases first and then decreases. The frost resistance of PCESM with 4% C14/EG phase change material is the best.
- phase-change material /
- phase change energy storage cement-based material /
- mechanical properties /
- freezing-thawing cycle /
- pore structure /
- damage

HTML全文

图 1 石墨 (a)、膨胀石墨(EG) (b) 和正十四烷/膨胀石墨(C14/EG)复合相变材料 (c) 的SEM图像

Figure 1. SEM images of graphite (a), expanded graphite (EG) (b) and n-tetradecane/expanded graphite (C14/EG) composite phase change materials (c)

下载: 全尺寸图片幻灯片

图 2 C14和C14/EG复合相变材料的DSC曲线

Figure 2. DSC curves of C14 and C14/EG composite phase change materials

T_onset—Onset temperature of the phase transformation in each phase change material (PCM); T_max-peak—Temperature at the peak of heat flow; T_completion—Temperature when each PCM completes the phase transformation; ∆H—Latent heat of each PCM

下载: 全尺寸图片幻灯片

图 3 EG、C14和C14/EG的FTIR图谱

Figure 3. FTIR spectra of EG, C14 and C14/EG

下载: 全尺寸图片幻灯片

图 4 相变储能水泥基材料(PCESM)抗压强度

Figure 4. Compressive strength of phase change energy storage mortar (PCESM)

下载: 全尺寸图片幻灯片

图 5 不同冻融循环次数后PCESM试件表观现象

Figure 5. Apparent phenomena of PCESM specimens after different freeze-thaw cycles

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图 6 PCESM质量损失率 (a) 和相对动弹性模量 (b) 与冻融循环次数之间的关系

Figure 6. Relationship between mass loss rate (a), relative dynamic elastic modulus (b) and freeze-thaw cycles of PCESM

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图 7 PCESM抗压强度与冻融循环次数之间的关系曲线

Figure 7. Relationship between compressive strength and freeze-thaw cycles of PCESM

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图 8 不同冻融循环次数下PCESM T₂谱分布

Figure 8. T₂ spectrum distributions of PCESM under different freeze-thaw cycles

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图 9 不同冻融循环次数PCESM孔隙分布

Figure 9. Pore distributions of PCESM with different freeze-thaw cycles

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表 1 相变储能水泥基材料(PCESM)配合比

Table 1. Mixture ratios of phase change energy storage cement-based materials (PCESM) kg·m⁻³

Sample	C14/EG	Cement	Sand	Water
JC	0	540	1278	270
2%(C14/EG)/C	10.8	540	1278	270
4%(C14/EG)/C	21.6	540	1278	270
6%(C14/EG)/C	32.4	540	1278	270
Notes: JC—Reference concrete without phase change materials; C14—n-Tetradecane; EG—Expanded graphite; C—Cement.

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