| 摘要: |
| 通过玄武岩纤维混凝土(BFRC)的快速冻融试验和微观孔结构试验,研究了2种冻融介质(水和质量分数为35%NaCl溶液)条件下BFRC相对动弹性模量、冻融损伤度以及强度的变化规律,分析了孔结构参数(含气量、孔比表面积、气泡间距系数和气泡平均弦长)与BFRC抗压强度、抗折强度和冻融损伤度的关系,采用灰熵法探讨了BFRC孔结构参数对其抗压强度、抗折强度以及冻融损伤度的影响规律.结果表明:BFRC强度随其含气量、气泡间距系数、气泡平均弦长的增加而减小,而冻融损伤度随上述3个孔结构参数的增加而增加;BFRC强度随其孔比表面积的增加而增加,而冻融损伤度随孔比表面积的增加而减小;对BFRC抗压强度、抗折强度影响最大的因素均为孔比表面积;影响BFRC冻融损伤度的主要因素为气泡间距系数和气泡平均弦长,这2个因素随冻融循环次数、玄武岩纤维掺量的变化而变化. |
| 关键词: 玄武岩纤维混凝土 冻融损伤度 灰熵 孔结构参数 |
| DOI：103969/j.issn.1007 9629201901007 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(11762015,11362013) |
|
| Grey Entropy Analysis of Macro and Micro Properties of BFRC after Freeze Thaw Cycles |
|
ZHAO Yanru, WANG Zhihui, WANG Lei, FAN Xiaoqi
|
|
School of Civil Engineering, Inner Mongolia University of Technology, Hohhot 010051, China
|
| Abstract: |
| Through the rapid freeze thaw test and micro pore structure test, the relative dynamic elastic modulus, freeze thaw damage degree and strength of basalt fiber reinforced concrete(BFRC) after freezing and thawing cycles in water and NaCl solution with concentration of 35%(by mass) were studied. The relationships of the pore structure parameters(air content, specific surface area, spacing factor, average chord length) with the compressive strength, flexural strength and freeze thaw damage degree of BFRC were investigated. Finally, the influences of pore structure parameters on compressive strength, flexural strength and freeze thaw damage degree were studied by means of grey entropy analysis. The results show that the strength of BFRC decreases with the increase of air content, spacing factor and average chord length, and the freeze thaw damage degree of BFRC increases with the increase of the above three pore structure parameters. The strength of BFRC increases with the increase of specific surface area, and the freeze thaw damage degree of BFRC decreases with the increase of specific surface area. The most important influential factor on the compressive and flexural strength of BFRC is specific surface area, and the main influencing factors of the freeze thaw damage degree of BFRC are spacing factor and average chord length with different freez thaw cycles and different basalt fiber contents. |
| Key words: basalt fiber reinforced concrete(BFRC) freeze thaw damage degree grey entropy pore structure parameter |
