玄武岩纤维泡沫混凝土的细观结构及损伤特性

周程涛; 陈波; 张娟; 李松

doi:10.13801/j.cnki.fhclxb.20231109.001

玄武岩纤维泡沫混凝土的细观结构及损伤特性

doi: 10.13801/j.cnki.fhclxb.20231109.001

周程涛^{1, 2},
陈波^{1, 2, ,},
张娟³,
李松^{1, 2}

1.
河海大学　水利水电学院，南京 210098
2.
河海大学　水灾害防御全国重点实验室，南京 210098
3.
江苏省水利勘测设计研究院有限公司，扬州 225009

基金项目: 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)

详细信息

通讯作者:
陈波，博士，教授，博士生导师，研究方向为水工混凝土新材料　E-mail: chenbo@hhu.edu.cn

中图分类号: TU528.2；TB332
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- 被引次数: 0
出版历程
- 收稿日期: 2023-09-27
- 修回日期: 2023-10-20
- 录用日期: 2023-11-02
- 网络出版日期: 2023-11-10
- 刊出日期: 2024-08-15

Microstructure and damage characteristics of basalt fiber reinforced foam concrete

ZHOU Chengtao^{1, 2},
CHEN Bo^{1, 2
, ,},
ZHANG Juan³,
LI Song^{1, 2}

1.
College of Water-conservancy and Hydropower, Hohai University, Nanjing 210098, China
2.
State Key Laboratory of Water Disaster Prevention, Hohai University, Nanjing 210098, China
3.
Jiangsu Surveying and Design Institute of Water Resources CO., LTD., Yangzhou 225009, China

Funds: General Program of National Natural Science Foundation of China (52079049); Basic Scientific Research Business Expenses of National Key Laboratories (522012272; 5230248 A2)

摘要

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/cm³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b_i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。
- 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 /
- b_i值
Abstract: 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/cm³. Based on Avizo image processing and acoustic emission basic parameters and b_i 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.
- basalt fiber reinforced foam concrete /
- microstructure /
- acoustic emission /
- damage characteristics /
- uniaxial compression /
- b_i value

HTML全文

图 1 玄武岩纤维

Figure 1. Basalt fiber

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图 2 BFRFC的X-CT图像分析示意图

Figure 2. X-CT image analysis diagram of BFRFC

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图 3 泡沫混凝土中玄武岩纤维三维分布图

Figure 3. Three-dimensional distribution of basalt fiber in foam concrete

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图 4 玄武岩纤维三向均匀性分析图

Figure 4. Three-dimensional uniformity analysis diagram of basalt fiber

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图 5 空间方位角θ和极角φ示意图

Figure 5. Spatial azimuth θ and polar angle φ diagram

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图 6 纤维角度空间分布

Figure 6. Spatial distribution of fiber angle

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图 7 BFRFC的孔隙球形度

Figure 7. Pore sphericity of BFRFC

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图 8 BFRFC的单轴压缩应力-应变曲线

Figure 8. Uniaxial compression stress-strain curves of BFRFC

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图 9 BFRFC的声发射信号参数

Figure 9. Acoustic emission signal parameters of BFRFC

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图 10 BFRFC的声发射$ {b}_{\mathrm{i}} $值

Figure 10. Acoustic emission $ {b}_{\mathrm{i}} $ value of BFRFC

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表 1 玄武岩纤维增强泡沫混凝土(BFRFC)的配合比

Table 1. Mix proportion of basalt fiber reinforced foam concrete (BFRFC)

Sample	Mix proportion/(kg·m⁻³)				Wet density/(kg·m⁻³)	Dry density/(kg·m⁻³)
Sample	Cement	Water	Foam	Basalt fiber	Wet density/(kg·m⁻³)	Dry density/(kg·m⁻³)
0%BF/FC-1	743.05	371.53	21.38	0	1170	1033
0%BF/FC-2	743.05	371.53	21.38	0	1200	1046
0%BF/FC-3	743.05	371.53	21.38	0	1180	1041
0.5%BF/FC-1	743.05	371.53	21.38	4.2	1206	1052
0.5%BF/FC-2	743.05	371.53	21.38	4.2	1200	1050
0.5%BF/FC-3	743.05	371.53	21.38	4.2	1199	1048
1.5%BF/FC-1	743.05	371.53	21.38	8.4	1169	1032
1.5%BF/FC-2	743.05	371.53	21.38	8.4	1170	1035
1.5%BF/FC-3	743.05	371.53	21.38	8.4	1172	1036
2.5%BF/FC-1	743.05	371.53	21.38	12.6	1181	1045
2.5%BF/FC-2	743.05	371.53	21.38	12.6	1203	1047
2.5%BF/FC-3	743.05	371.53	21.38	12.6	1208	1050
Notes: The specimen number as 0.5%BF/FC-1, where 0.5%BF/FC represents the volume ratio of basalt fiber, and 1 represents the specimen number; BF—Basalt fiber; FC—Foam concrete.

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