玄武岩纤维泡沫混凝土抗冻融性能

孙浩文; 陈波; 高志涵; 郭凌云

玄武岩纤维泡沫混凝土抗冻融性能

孙浩文^{1, 2},
陈波^{1, 2, ,},
高志涵^{1, 2, 3},
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.
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)；国家资助博士后项目(GZC20230671)；江苏省卓越博士后项目(2023ZB703)

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；TB332
计量
- 文章访问数: 29
- HTML全文浏览量: 15
- 被引次数: 0
出版历程
- 收稿日期: 2024-08-20
- 修回日期: 2024-10-09
- 录用日期: 2024-10-18
- 网络出版日期: 2024-10-28

Freeze-thaw resistance of basalt fiber reinforced foam concrete

SUN Haowen^{1, 2},
CHEN Bo^{1, 2
, ,},
GAO Zhihan^{1, 2, 3},
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.
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); National Funded Postdoctoral Program (GZC20230671); Jiangsu Province Outstanding Postdoctoral Program (2023ZB703)

摘要

摘要: 在0、25、50和75次冻融循环条件下，对不同密度(600 kg/m³和1000 kg/m³)和纤维掺量(0、0.15%、0.30%和0.45%)的玄武岩纤维泡沫混凝土试样(Basalt fiber reinforced foam concrete, BFRFC)进行了单轴压缩-声发射联合试验，并基于声发射RA-AF值分布规律、b值变化曲线以及三个宏观抗冻性能指标(吸水率、质量损失率、相对动弹性模量)，探究了BFRFC冻融劣化损伤特征与抗冻性能变化规律。结果表明：BFRFC单轴压缩过程中的应力-应变关系曲线具有明显阶段性；冻融循环会导致试样整体强度下降，开裂加快，内部剪切破坏占比提高，而增加玄武岩纤维掺量和材料密度均能够提高试样的峰值承载力(0、25、50和75次冻融循环下最高分别达到11.14 MPa、10.20 MPa、8.741 MPa、7.498 MPa)，抑制峰值强度的损失(最多可降低17.9%)，提高张拉破坏占比(最多可提高32.4%)，延缓试件破坏；另外，随冻融循环次数的增加，BFRFC的吸水率和质量损失率增大，相对动弹性模量下降，相比之下，高密度和高纤维掺量BFRFC的吸水率和质量损失率更小、相对动弹性模量更大，75次冻融循环下质量损失率和相对动弹性模量仍能分别保持在3%以下和70%以上，抗冻性能更佳。
- 玄武岩纤维泡沫混凝土 /
- 声发射 /
- 冻融劣化 /
- 损伤特征 /
- 抗冻性能
Abstract: Uniaxial compression-acoustic emission combined tests were conducted on basalt fiber reinforced foam concrete specimens (BFRFC) with different densities (600 kg/m³ and 1000 kg/m³) and fiber admixtures (0, 0.15%, 0.30%, and 0.45%) under the conditions of 0, 25, 50, and 75 freeze-thaw cycles. And based on the distribution law of acoustic emission RA-AF values, the b-value change curve as well as three macroscopic freezing performance indexes (water absorption, mass loss rate, and relative dynamic elastic modulus), the damage characteristics and freezing performance change rule of each grade of BFRFC under freeze-thaw environment were investigated. The results show that the stress-strain relationship curves during uniaxial compression of BFRFC have obvious stages. Freezing and thawing cycles lead to a decrease in the overall strength of the specimen, accelerated cracking, and an increase in the percentage of internal shear damage, whereas increasing both the basalt fiber doping and the material density can increase the peak load carrying capacity of the specimen (up to 11.14 MPa, 10.20 MPa, 8.741 MPa, and 7.498 MPa under 0, 25, 50, and 75 freezing and thawing cycles, respectively), inhibit the loss of the peak strength (up to 17.9%), increasing the percentage of tension damage (up to 32.4%) and delaying specimen damage. In addition, with the increase of the number of freeze-thaw cycles, the water absorption and mass loss rate of BFRFC increase, and the relative dynamic elastic modulus decreases. In contrast, the water absorption and mass loss rate of high-density and high-fiber doped BFRFC are smaller, the relative dynamic elastic modulus is larger, and the mass loss rate and relative dynamic elastic modulus can be kept below 3% and above 70% respectively under 75 freeze-thaw cycles, which has better frost resistance.
- basalt fiber reinforced foam concrete /
- acoustic emission /
- freeze-thaw deterioration /
- damage characteristics /
- frost resistance

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图 1 试验方法与仪器

Figure 1. Test methods and apparatus

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图 2 冻融环境下各等级BFRFC试样的应力-应变关系曲线

Figure 2. Stress-strain relationship for different grades of BFRFC under different freeze-thaw cycles

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图 3 BFRFC代表性试样破坏面

Figure 3. Damage surface of representative BFRFC specimen

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图 4 冻融环境下各等级BFRFC峰值强度

Figure 4. Peak strength for different grades of BFRFC under different freeze-thaw cycles

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图 5 冻融环境下各等级BFRFC峰值强度损失率

Figure 5. Strength loss rate for different grades of BFRFC under different freeze-thaw cycles

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图 6 声发射各特征参数示意图

Figure 6. Definition of the AE parameters

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图 7 冻融环境下基于RA-AF值的BFRFC裂纹分类

Figure 7. Crack classification of BFRFC based on RA-AF under different freeze-thaw cycles

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图 8 不同冻融循环次数下BFRFC声发射b值

Figure 8. Acoustic emission b-value of BFRFC under different freeze-thaw cycles

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图 9 冻融环境下各等级BFRFC吸水率

Figure 9. Water absorption for different grades of BFRFC under different freeze-thaw cycles

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图 10 冻融环境下各等级BFRFC质量损失率

Figure 10. Mass loss for different grades of BFRFC under different freeze-thaw cycles

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图 11 冻融环境下各等级BFRFC相对动弹性模量

Figure 11. Relative dynamic elastic modulus for different grades of BFRFC under different freeze-thaw cycles

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表 1 玄武岩纤维增强泡沫混凝土的配合比

Table 1. Mix ratio 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)
C06/P06	416.67	208.33	35.49	0/0.15/0.3/0.45	0/4.2/8.4/12.6
C10/P10	743.05	371.53	21.83	0/0.15/0.3/0.45	0/4.2/8.4/12.6
Notes: C06 and C10 represent cubic specimens with a density of 600 kg/m³ and 1000 kg/m³, respectively, while P06 and P10 represent prismatic specimens.

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