摘要
为了研究玄武岩纤维增强泡沫混凝土的细观结构特征和不同纤维掺量对其损伤特性的影响,本文对密度等级1000 kg/cm^(3)的玄武岩纤维增强泡沫混凝土开展了X-CT试验及单轴压缩-声发射联合试验,基于Avizo图像处理及声发射bi值(改进版b值)等参数分析了纤维及孔隙的细观结构特征及材料损伤演化特性。结果表明:掺入玄武岩纤维可有效改善泡沫混凝土力学性能,掺入0.5vol%、1.5vol%、2.5vol%纤维后试件平均抗压强度分别提升了1.37 MPa、4.58 MPa、2.77 MPa;2.5vol%掺量的试件中纤维分形维数主要在1.0~1.3,纤维团聚明显,纤维角度集中,试件性能较1.5vol%掺量有所降低;掺入玄武岩纤维后试件声发射b_(i)值趋势更平缓,玄武岩纤维可有效抑制裂纹发育。
In order to study the microstructure characteristics of basalt fiber reinforced foam concrete and the influence of different fiber content on its damage characteristics,this paper carried out X-CT test and uniaxial compression acoustic emission joint test on basalt fiber reinforced foam concrete with density grade of 1000 kg/cm^(3).Based on Avizo image processing and acoustic emission basic parameters and bi values(Improved b value),the microstructure characteristics of fibers and pores and the damage evolution characteristics of materials were analyzed.The results show that the addition of basalt fiber can effectively improve the mechanical properties of foam concrete.The average compressive strength of the specimens with 0.5vol%,1.5vol%and 2.5vol%fibers increase by 1.37 MPa,4.58 MPa and 2.77 MPa,respectively.The fiber fractal dimension of the specimen with 2.5vol%content is mainly in the range of 1.0-1.3,the fiber agglomeration is obvious,the fiber angle is concentrated,and the performance of the specimen is reduced.After adding basalt fiber,the trend of acoustic emission b_(i) value of the specimen is gentler,and basalt fiber can effectively inhibit crack development.
作者
周程涛
陈波
张娟
李松
ZHOU Chengtao;CHEN Bo;ZHANG Juan;LI Song(College of Water-conservancy and Hydropower,Hohai University,Nanjing 210098,China;State Key Laboratory of Water Disaster Prevention,Hohai University,Nanjing 210098,China;Jiangsu Surveying and Design Institute of Water Resources CO.,LTD.,Yangzhou 225009,China)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2024年第8期4236-4245,共10页
Acta Materiae Compositae Sinica
基金
国家自然科学基金面上项目(52079049)
国家重点实验室基本科研业务费(522012272,5230248 A2)。
关键词
玄武岩纤维泡沫混凝土
细观结构
声发射
损伤特性
单轴压缩
bi_值
basalt fiber reinforced foam concrete
microstructure
acoustic emission
damage characteristics
uniaxial compression
bi value
