冻融环境下玄武岩纤维泡沫混凝土损伤-声发射特征

牛瀚仪; 陈波; 高志涵; 郭凌云

冻融环境下玄武岩纤维泡沫混凝土损伤-声发射特征

牛瀚仪^{1, 2, 3},
陈波^{1, 2, ,},
高志涵^{1, 2, 4},
郭凌云^{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.
南京水利科学研究院, 南京 210029
4.
水利部珠江水利委员会, 广州 510611

基金项目: 国家自然科学基金项目(52079049; 52239009)；国家重点实验室基本科研业务费(522012272)

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
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- 文章访问数: 52
- HTML全文浏览量: 22
- 被引次数: 0
出版历程
- 收稿日期: 2024-05-06
- 修回日期: 2024-05-30
- 录用日期: 2024-06-09
- 网络出版日期: 2024-06-22

Damage-acoustic emission characterization of basalt fiber foam concrete under freeze-thaw environment

NIU Hanyi^{1, 2, 3},
CHEN Bo^{1, 2
, ,},
GAO Zhihan^{1, 2, 4},
GUO Lingyun^{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.
Nanjing Hydraulic Research Institute, Nanjing 210029, China
4.
Pearl River Water Resources Commission of the Ministry of Water Resources,Guangzhou 510611, China

Funds: General Program of National Natural Science Foundation of China (52079049; 52239009); Basic Scientific Research Business Expenses of National Key Laboratories (522012272)

摘要

摘要: 对600和1000密度下4种不同玄武岩纤维掺量(0%、0.15%、0.30%和0.45%)泡沫混凝土(BFRFC)试样进行不同冻融环境下(0、20、40、60和80次冻融循环)单轴压缩联合声发射试验，探究了密度、纤维掺量、冻融循环次数对BFRFC单轴压缩性能的影响，并依据声发射与单轴压缩试验参数建立冻融环境下BFRFC受压损伤本构模型，定量分析不同冻融循环下BFRFC的损伤。结果表明：BFRFC在受压过程有明显的阶段性，分为密实、弹性、屈服和平台四个阶段，声发射特征呈现出接触期、陡增期和缓增期三个阶段；不同冻融循环次数下各试样的强度损失率范围为3.4%~63.6%；冻融环境会降低声发射的活跃度，严重影响BFRFC力学性能；玄武岩纤维掺入使试样累计振铃数先增加后减小，能在一定程度上减缓峰值强度的损失；冻融循环加速裂纹开展，玄武岩纤维可有效抑制裂纹发展，但高掺量时纤维团聚现象凸显，内部损伤加剧；BFRFC在受压前期损伤较低，在相对峰值应力大于0.7时损伤发展加速，直至破坏。
- 玄武岩纤维增强泡沫混凝土 /
- 冻融循环 /
- 声发射 /
- 单轴压缩 /
- 本构模型
Abstract: The uniaxial compression-acoustic emission tests were carried out on four different basalt fiber admixture (0%, 0.15%, 0.30%, and 0.45%) foam concrete (BFRFC) specimens at 600 and 1000 densities in different freeze-thaw environments (0, 20, 40, 60, and 80 freeze-thaw cycles) to investigate the effects of density, fiber admixture, and number of freeze-thaw cycles on the uniaxial compression performance of BFRFC. The compression damage model was established based on the acoustic emission and uniaxial compression parameters to quantitatively analyze the damage of BFRFC under different freezing and thawing cycles. The results show that: BFRFC has obvious stages in the compression process, which are divided into four stages of dense, elastic, yield and platform, and the acoustic emission characteristics show three stages of contact, steep increase and slow increase; the strength loss rate of each specimen under different numbers of freezing and thawing cycles ranges from 3.4% to 63.6%; the freezing and thawing environment would reduce the activity of acoustic emission, which would seriously affect the mechanical properties of BFRFC; basalt fiber doping causes the cumulative ringing number of the specimen to increase and then decrease, which could slow down the loss of peak strength to a certain extent; Freeze-thaw cycle accelerates the crack development, basalt fibers could effectively inhibit the development of cracks, but the fiber agglomeration phenomenon is highlighted at high doping, and the internal damage is aggravated; The damage of the BFRFC in the pre-pressure stage is low, and the damage development is accelerated at the relative peak stress of more than 0.7, until the damage is damaged.
- basalt fiber reinforced foam concrete /
- freeze-thaw cycle /
- acoustic emission /
- uniaxial compression /
- constitutive model

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图 1 试验方法与仪器

Figure 1. Test method and apparatus

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图 2 BFRFC的应力-应变关系曲线

Figure 2. Stress-strain relationship curve of BFRFC

Sample number A06-0.15% represents the design of dry density of 1000 and the volume of basalt fiber mixed with 0.15%. The rest of the sample numbers are the same rules

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图 3 BFRFC代表性试样的破坏界面

Figure 3. Damage interface of representative specimen of BFRFC

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图 4 冻融环境下各等级BFRFC试样的应力-应变关系曲线

Figure 4. Stress-strain relationship curves of BFRFC specimens of various grades in freeze-thaw environment

20 F-T refers to the specimen with 20 freeze-thaw cycles, the rest of the specimen numbering rules are the same

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图 5 BFRFC的平均峰值强度损失情况

Figure 5. Average peak intensity loss for BFRFC

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图 6 A06、A10等级各试样的声发射累计振铃计数-荷载关系曲线

Figure 6. Acoustic emission cumulative ring count-load relationship curves for each specimen of A06 and A10 grades

The red vertical line represents the cumulative number of acoustic emission events

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图 7 A10-0.30%不同冻融循环次数下的声发射累计振铃计数-荷载关系曲线

Figure 7. Acoustic emission cumulative ring count-load curves for A10-0.30% with different number of freeze-thaw cycles

The red vertical line represents the cumulative number of acoustic emission events

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图 8 不同冻融循环次数下A10-0.30%的受压损伤演化

Figure 8. Compression damage evolution of A10-0.30% under different number of freeze-thaw cycles

20 F-T refers to the specimen with 20 freeze-thaw cycles, the rest of the specimen numbering rules are the same

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图 9 不同密度和纤维掺量BFRFC初始冻融损伤变量

Figure 9. Initial freeze-thaw damage variables of BFRFC with different densities and fiber dopings

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表 1 玄武岩纤维增强泡沫混凝土的配合比及密度

Table 1. Mix ratio and density of basalt fiber reinforced foam concrete

Density level	Cement/(kg·m⁻³)	Water/(kg·m⁻³)	Foam/(kg·m⁻³)	Basalt fiber volume fraction/vol%	Mass of basalt fiber/(kg·m⁻³)
A06	416.67	208.33	35.49	0/0.15/0.3/0.45	0/4.2/8.4/12.6
A10	743.05	371.53	21.83	0/0.15/0.3/0.45	0/4.2/8.4/12.6
Notes: A06 and A10 represent BFRFC with the density level of 600 and 1000 kg/m³, respectively.

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表 2 不同纤维含量下BFRFC峰值差异(MPa)

Table 2. Differences in peak values of basalt fiber foam concrete with different fiber contents (MPa)

Density grade	0	0.15%	0.30%	0.45%
A06	3.164	4.012	5.500	6.587
A10	6.431	7.042	8.336	11.176

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表 3 不同冻融循环次数下A10-0.30%试件的拟合参数值

Table 3. Fitted parameter values of A10-0.30% specimens under different freeze-thaw cycles

Freeze-thaw cycles	c	m	n
0	1.8347	3.7982	−0.0363
20	2019.3510	0.4204	0.0490
40	681.7456	1.2910	0.0227
60	203.2789	0.3836	0.1033
80	172.9196	−0.6244	0.1847

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