[1]宦文娟,张云升,刘国建,等.冻融环境下黏土红砖的性能劣化规律与微结构演化[J].东南大学学报(自然科学版),2014,44(2):401-405.[doi:10.3969/j.issn.1001-0505.2014.02.031]
 Huan Wenjuan,Zhang Yunsheng,Liu Guojian,et al.Performance deterioration and microstructure evolution of clay brick submitted to freeze-thaw cycles[J].Journal of Southeast University (Natural Science Edition),2014,44(2):401-405.[doi:10.3969/j.issn.1001-0505.2014.02.031]
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冻融环境下黏土红砖的性能劣化规律与微结构演化()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
44
期数:
2014年第2期
页码:
401-405
栏目:
材料科学与工程
出版日期:
2014-03-20

文章信息/Info

Title:
Performance deterioration and microstructure evolution of clay brick submitted to freeze-thaw cycles
作者:
宦文娟张云升刘国建赵鹏
东南大学材料科学与工程学院, 南京 211189; 东南大学江苏省土木工程材料重点实验室, 南京 211189
Author(s):
Huan Wenjuan Zhang Yunsheng Liu Guojian Zhao Peng
School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
Jiangsu Key Laboratory of Civil Engineering Materials, Southeast University, Nanjing 211189, China
关键词:
黏土砖 冻融循环 性能劣化 微结构演化
Keywords:
clay brick freeze-thaw cycle performance deterioration microstructure evolution
分类号:
TU522
DOI:
10.3969/j.issn.1001-0505.2014.02.031
摘要:
系统研究了黏土红砖在冻融环境下的外观、质量损失率及相对动弹模量变化;采用压汞法分析了黏土红砖冻融前后的孔径分布变化规律,并应用X射线计算机断层扫描技术原位定量追踪了黏土红砖冻融环境下的三维孔结构演化过程.结果表明,冻融初期黏土红砖外观破坏不明显,35次冻融循环后开始出现宏观裂纹,65次冻融循环后分层,并沿分层界面剥落.黏土红砖质量及相对动弹模量随冻融次数的增加均表现出先略有增大再下降的规律,并且质量变化敏感.孔结构分析结果表明,65次冻融循环后黏土红砖平均孔径增大近4倍,气孔总体积增加23%,体积为0.01~0.1 mm3的气孔数量和体积显著增多,抗冻性能明显降低.
Abstract:
The changes of appearance, mass loss percentage and relative dynamic elastic modulus of clay brick submitted to freeze-thaw cycles were systematically studied. The mercury intrusion porosimetry(MIP)was utilized to investigate the pore size distribution before and after freeze-thaw cycles. The X-ray computed tomography(CT)was also used to in situ quantitatively observe the evolution of the three-dimensional pore structure under freeze-thaw cycles. The results show that the frost damage is slight in the early stages. Macroscopic cracks appear on the surface after 35 freeze-thaw cycles and spalling occurs after 65 cycles. Mass is more sensitive when submitted to freeze-thaw cycles and shows a similar regulation as the relative dynamic elastic modulus with a first gradual increase, followed by a decrease. The pore structure analysis results show that the average pore size increases about 4 times after freeze-thaw cycles with coarse pores increasing by 23% in volume. Simultaneously, the number and the volume of pores with the volume of 0.01 to 0.1 mm3 increase evidently. The frost resistance of clay red brick is reduced consequently.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期: 2013-08-09.
作者简介: 宦文娟(1988—),女,硕士生;张云升(联系人),男,博士,教授,博士生导师,zhangys279@163.com.
基金项目: 国家自然科学基金重点资助项目(51138002)、“十二五”国家科技支撑计划资助项目(2012BAK14B05).
引用本文: 宦文娟,张云升,刘国建,等.冻融环境下黏土红砖的性能劣化规律与微结构演化[J].东南大学学报:自然科学版,2014,44(2):401-405. [doi:10.3969/j.issn.1001-0505.2014.02.031]
更新日期/Last Update: 2014-03-20