不同损伤源对玄武岩纤维增强混凝土孔隙结构变化特征的影响

薛维培; 刘晓媛; 姚直书; 程桦; 李昊鹏

doi:10.13801/j.cnki.fhclxb.20200219.001

不同损伤源对玄武岩纤维增强混凝土孔隙结构变化特征的影响

doi: 10.13801/j.cnki.fhclxb.20200219.001

薛维培^{1, 2, ,},
刘晓媛^1,,
姚直书^1,,
程桦^1,,
李昊鹏^1,

1.
安徽理工大学　土木建筑学院，淮南 232001
2.
安徽理工大学　安全科学与工程博士后科研流动站，淮南 232001

基金项目: 安徽省自然科学基金青年项目(1908085QE185)；中国博士后科学基金面上项目(2018M642502)；安徽省高等学校自然科学研究重点项目(KJ2018A0098)；国家自然科学基金面上项目(51674006; 51874005)

详细信息

通讯作者:
薛维培，博士，副教授，硕士生导师，研究方向为混杂纤维混凝土水力耦合特性及耐久性　 E-mail：xueweipei@163.com

中图分类号: TB528
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出版历程
- 收稿日期: 2019-10-23
- 录用日期: 2020-01-03
- 网络出版日期: 2020-02-19
- 刊出日期: 2020-09-15

Effects of different damage sources on pore structure change characteristics of basalt fiber reinforced concrete

XUE Weipei^{1, 2
, ,},
LIU Xiaoyuan^1
,,
YAO Zhishu^1
,,
CHENG Hua^1
,,
LI Haopeng^1
,

1.
School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China
2.
Post-doctoral Research Station of Safety Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China

摘要

摘要: 为了研究玄武岩纤维增强混凝土在高温和力学两种损伤源下的孔隙结构变化特征，采用核磁共振(NMR)和扫描电镜(SEM)技术，观察试件T₂谱分布、孔径分布、孔洞和裂隙发育情况。结果表明，高温作用后基准混凝土、短玄武岩纤维增强混凝土、长玄武岩纤维增强混凝土均呈微孔数量不断减小、介孔数量不断增加的趋势。通过对比发现，长玄武岩纤维增强混凝土T₂谱主峰孔隙数量最多，孔径分布最大。以长玄武岩纤维增强混凝土为例，研究在高温和力学两种损伤源下玄武岩纤维增强混凝土的孔隙结构变化特征。发现弛豫时间在0.1~10 ms内高温损伤下玄武岩纤维增强混凝土的孔隙数量大于力学损伤下的孔隙数量，且随着温度升高，T₂谱主峰向右偏移，随着荷载增加，T₂谱主峰几乎不发生变化，表明温度升高更能加剧损伤，每级温度作用下新生孔径不断增大。T₂谱主峰幅值和孔径分布随温度升高不断增大，随荷载增加出现先减小后增大的现象，表明高温作用对混凝土直接构成损伤，而力学作用使混凝土先密实再产生损伤，SEM观察得到了相同的结论。
- 玄武岩纤维增强混凝土 /
- 高温损伤 /
- 力学损伤 /
- 孔隙结构 /
- 核磁共振 /
- 扫描电镜
Abstract: In order to study the pore structure change characteristics of basalt fiber reinforced concrete under two sources of damage, high temperature and mechanics, nuclear magnetic resonance(NMR) and scanning electron microscopy(SEM) techniques were used to observe the T₂ spectrum distribution, pore size distribution and flaw development of the basalt fiber reinforced concrete. The results show that normal concrete, short basalt fiber reinforced concrete and long basalt fiber reinforced concrete show a trend of decreasing the number of micropores and increasing the number of mesopores after high temperature. By comparison, it is found that long basalt fiber reinforced concrete has the largest number of pores in the main peak of the T₂ spectrum and the largest pore size distribution. The long basalt fiber reinforced concrete was taken as an example to illustrate the change characteristics of pore structure under two kinds of damage sources. The number of pores under high temperature damage with a relaxation time of 0.1–10 ms is greater than the number of pores under mechanical damage. And the main peak of T₂ spectrum shiftes to the right as the temperature increases. However, the main peak of T₂ spectrum hardly changes with the increase of load, indicating that the increase in temperature can aggravate the damage more than mechanical. And the new pore diameter increases continuously under each temperature. The main peak of T₂ spectrum and pore size distribution increase with temperature increasing, and decrease at first and then increase with increasing load, which indicates that the high temperature directly causes damages to the concrete, while the mechanical makes the concrete dense at first and then damage. The same conclusion is obtained by electron microscope observation.
- basalt fiber reinforced concrete /
- high temperature damage /
- mechanical damage /
- pore structure /
- nuclear magnetic resonance /
- scanning electron microscope

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图 1 玄武岩纤维

Figure 1. Basalt fibers

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图 2 MesoMR23-060V-1型核磁共振仪

Figure 2. MesoMR23-060V-1 nuclear magnetic resonance

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图 3 高温损伤后不同玄武岩纤维增强混凝土外观形貌

Figure 3. Appearances and morphologies of different basalt fiber reinforced concretes after different high temperatures damaging

P—Normal concrete; D—Short basalt fiber reinforced concrete; C—Long basalt fiber reinforced concrete

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图 4 不同温度下玄武岩纤维增强混凝土的T₂图谱

Figure 4. T₂ spectra of basalt fiber reinforced concretes at different temperatures

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图 5 不同温度下玄武岩纤维增强混凝土的孔径分布

Figure 5. Pore size distribution of basalt fiber reinforced concretes at different temperatures

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图 6 不同力学损伤下长玄武岩纤维增强混凝土T₂图谱及孔径分布

Figure 6. T₂ spectra and pore size distribution of long basalt fiber reinforced concrete under different mechanical damage

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图 7 长玄武岩纤维增强混凝土孔洞和裂隙经过高温作用后发展情况

Figure 7. Development of holes and fissures in long basalt fiber reinforced concrete after high temperatures

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图 8 长玄武岩纤维增强混凝土孔洞和裂隙经过力学损伤后发展情况

Figure 8. Development of holes and fissures in long basalt fiber reinforced concrete after mechanical damage

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表 1 混凝土配合比

Table 1. Mix proportion of concrete

Type of concrete	Material utilization amount/(kg·m⁻³)
Type of concrete	Cement	Water	Sand	Stone	NF-F	Fiber
Normal concrete	380	176	662.11	1 151.89	50	–
Short basalt fiber/concrete	380	176	662.11	1 151.89	50	1.9
Long basalt fiber/concrete	380	176	662.11	1 151.89	50	1.9
Note: NF-F——Compound admixture.

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表 2 玄武岩纤维主要性能指标

Table 2. Main performance indexes of basalt fibers

Fiber length/mm	Monofilament diameter/μm	Stretch strength/MPa	Density/(g·cm⁻³)	Elastic modulus/GPa
12, 24	11	3 900	2.64	105

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表 3 不同温度下玄武岩纤维增强混凝土的T₂图谱主峰幅值和面积

Table 3. Main peak amplitude and area of T₂ spectra of basalt fiber reinforced concretes at different temperatures

Concrete type	100℃		300℃		600℃		900℃
Concrete type	Amplitude	Area (a. u.)	Amplitude	Area (a. u.)	Amplitude	Area (a. u.)	Amplitude	Area (a. u.)
Normal concrete	102	179	143	324	140	312	165	493
Short basalt fiber reinforced concrete	110	172	145	313	155	350	169	535
Long basalt fiber reinforced concrete	136	153	161	253	174	370	178	566

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表 4 不同温度下玄武岩纤维增强混凝土孔径分布特征

Table 4. Pore size distribution characteristics of basalt fiber reinforced concretes at different temperatures

Temperature/℃	Normal concrete/%			Short basalt fiber reinforced concrete/%			Long basalt fiber reinforced concrete/%
Temperature/℃	Micropores	Mesoporous	Porosity	Micropores	Mesoporous	Porosity	Micropores	Mesoporous	Porosity
100	87.4	12.6	0.48	83.7	16.3	0.57	93.9	6.1	0.71
300	84.0	14.0	0.66	84.8	15.2	0.77	87.2	12.8	0.77
600	83.3	16.7	0.83	82.6	17.4	1.02	81.8	18.2	1.04
900	77.4	22.6	0.92	78.7	21.3	1.24	76.2	23.8	1.58

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表 5 不同力学损伤下长玄武岩纤维增强混凝土T₂图谱主峰面积

Table 5. Main peak area of T₂ spectra of long basalt fiber reinforced concrete under different mechanical damage

Mechanical load/MPa	5	10	15	25
Main peak area (a.u.)	124	108	114	146

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