橡胶地聚物混凝土力学性能及阻尼特性试验研究

孙杰; 陈国珍; 吕康琪; 王安宁

doi:10.13801/j.cnki.fhclxb.20211201.002

橡胶地聚物混凝土力学性能及阻尼特性试验研究

doi: 10.13801/j.cnki.fhclxb.20211201.002

武汉科技大学　城市建设学院，武汉 430065

基金项目: 湖北省建设科技计划项目(202144)；湖北省教育厅科学研究计划青年人才项目(Q20201101)

详细信息

通讯作者:
孙杰，博士，副教授，硕士生导师，研究方向为路基路面材料、新型建筑材料　E-mail:63460968@qq.com

中图分类号: TU52
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出版历程
- 收稿日期: 2021-10-19
- 修回日期: 2021-11-23
- 录用日期: 2021-11-24
- 网络出版日期: 2021-12-03
- 刊出日期: 2022-11-01

Experimental study on mechanical properties and damping characteristics of rubber geopolymer concrete

School of Urban Construction, Wuhan University of Science and Technology, Wuhan 430065, China

摘要

摘要: 为了研究橡胶地聚物混凝土的力学性能及阻尼特性，基于橡胶颗粒替代体积分数为试验参数，进行了混凝土力学性能试验和悬臂梁在低周反复作用下的自由振动试验，分析了橡胶地聚物混凝土的力学性能随橡胶颗粒替代体积分数变化的影响规律，研究了橡胶地聚物混凝土悬臂梁在不同损伤控制位移下和不同橡胶颗粒替代体积分数下的阻尼性能，建立了悬臂梁阻尼比与损伤指数之间的关系。结果表明：少量的橡胶颗粒能够提高地聚物混凝土抗折强度，改善混凝土的韧性；相同损伤指数的橡胶地聚物混凝土悬臂梁的阻尼比随着橡胶颗粒替代体积分数的增大而增大；随着损伤指数的增大，同一橡胶颗粒替代体积分数下的橡胶地聚物混凝土悬臂梁阻尼比均呈现先增大后减小的趋势；通过分析不同替代体积分数下的橡胶地聚物混凝土的弯曲动刚度、损伤指数及阻尼比和损伤指数之间的关系，采用替代体积分数为10vol%的橡胶颗粒不仅可以增强橡胶地聚物混凝土悬臂梁的阻尼特性，而且其刚度退化规律具有可控性。
- 橡胶地聚物混凝土 /
- 力学性能 /
- 阻尼比 /
- 损伤指数 /
- 弯曲动刚度
Abstract: To investigate the mechanical properties and the damping performance of the rubber geopolymer concrete, the concrete mechanical performance test and the free vibration test of the cantilever beam under the low cyclic action were done based on the replacement volume fraction of the rubber particles for the test parameters. The influence law of the rubber geopolymer concrete with the variation of the replacement volume fraction of the rubber particles was analyzed. The damping performance of the rubber geopolymer concrete cantilever beam under the different damage control displacement and the different replacement volume fraction of the rubber particles was studied. The relationship between the damping ratio and the damage index of the cantilever beam was established. The results show that a small amount of the rubber particles can enhance the flexural strength and improve the toughness of the geopolymer concrete. The damping ratio of the rubber geopolymer concrete cantilever beam with the same damage index increases with the increase of the replacement volume fraction of rubber particles. With the increase of the damage index, the damping ratio of the rubber geopolymer concrete cantilever beam increases first and then decreases under the same replacement volume fraction of the rubber particles. By analyzing the bending dynamic stiffness, the damage index and the relationship between the damping ratio and the damage index of the rubber geopolymer concrete with the different replacement volume fraction of the rubber particles, it is found that the rubber particles with 10vol% replacement volume fraction can not only enhance the damping characteristics of cantilever beam, but also its stiffness degradation law is controllable.
- rubber geopolymer concrete /
- mechanical properties /
- damping ratio /
- damage index /
- bending dyna-mic stiffness

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图 1 钢筋布置图

Φ—First grade steel symbol

Figure 1. Reinforcement arrangement

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图 2 橡胶地聚物混凝土悬臂梁加载图

Figure 2. Loading diagram of the rubber geopolymer concrete cantilever beam

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图 3 自由振动试验加载程序

Figure 3. Free vibration test loading procedure

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图 4 自由振动测试装置

Figure 4. Free vibration testing device

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图 5 橡胶地聚物混凝土抗压强度

Figure 5. Compressive strength of the rubber geopolymer concrete

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图 6 橡胶地聚物混凝土抗折强度

Figure 6. Flexural strength of the rubber geopolymer concrete

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图 7 橡胶颗粒在混凝土中裂纹桥接

R—Rubber

Figure 7. Crack bridging of the rubber particles in the concrete

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图 8 抗折试验后橡胶地聚物混凝土试块

Figure 8. Rubber geopolymer concrete specimen after bending

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图 9 橡胶地聚物混凝土力学性能变异系数

Figure 9. Variation coefficient of the mechanical properties of the rubber geopolymer concrete

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图 10 橡胶地聚物混凝土悬臂梁自由衰减时程曲线

Figure 10. Time history curve of vibration of the rubber geopolymer concrete cantilever beam

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图 11 橡胶地聚物混凝土悬臂梁各阶段裂缝发展

Figure 11. Fracture development of the rubber geopolymer concrete cantilever beam at the different stages

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图 12 橡胶地聚物混凝土悬臂梁各损伤阶段的阻尼比

Figure 12. Damping ratio at damage stages of the rubber geopolymer concrete cantilever beam

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图 13 橡胶地聚物混凝土悬臂梁各损伤阶段的基本频率

Figure 13. Fundamental frequency at damage stages of the rubber geopolymer concrete cantilever beam

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图 14 橡胶地聚物混凝土截面的弯曲动刚度与损伤位移的关系

Figure 14. Relationship between bending dynamic stiffness and the damage displacement of the rubber geopolymer concrete

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图 15 橡胶地聚物混凝土损伤指数随位移角的变化

Figure 15. Change of damage indexes of the rubber geopolymer concrete with displacement angle

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图 16 橡胶地聚物混凝土损伤指数$ {I}_{\text{D}} $与位移角的统计关系

P-R/GC—Plan of rubber geopolymer concrete fit curve; R/GC—Rubber geopolymer concrete

Figure 16. Statistical relationship between damage index $ {I}_{\text{D}} $ of the rubber geopolymer concrete and displacement angle

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图 17 橡胶地聚物混凝土阻尼比与损伤指数的关系

Figure 17. Relationship between damping ratio and damage index of the rubber geopolymer concrete

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图 18 橡胶地聚物混凝土阻尼比与损伤指数的统计关系

Figure 18. Statistical relationship between damping ratio and damage index of the rubber geopolymer concrete

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表 1 矿渣粉性能参数

Table 1. Performance parameters of slag powder

Density/ (g·cm⁻³)	Specific surface area/(kg·m⁻³)	28 days activity index/%	Ignition loss/%	Fluidity than/%
2.90	418	97	0.23	98

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表 2 橡胶颗粒替代体积分数

Table 2. Replacement volume fraction of the rubber particles

Specimen	Volume fraction of rubber replacement/vol%
GC	0
5%R/GC	5
10%R/GC	10
15%R/GC	15
Notes: R—Rubber; GC—Geopolymer concrete.

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表 3 橡胶地聚物混凝土立方体抗压强度及变异系数

Table 3. Compressive strength and variation coefficient of the rubber geopolymer concrete

Specimen	Compressive strength/MPa	Standard deviation	Variation coefficient
GC	71.88	8.35	0.11
5%R/GC	57.74	4.04	0.07
10%R/GC	54.66	7.31	0.13
15%R/GC	52.84	10.14	0.19

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表 4 橡胶地聚物混凝土抗折强度及变异系数

Table 4. Flexural strength and variation coefficient of the rubber geopolymer concrete

Specimen	Flexural strength/MPa	Standard deviation	Variation coefficient
GC	5.58	0.20	0.03
5%R/GC	6.08	0.62	0.10
10%R/GC	5.51	0.43	0.08
15%R/GC	5.41	0.55	0.10

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表 5 橡胶地聚物混凝土悬臂梁各损伤阶段基本频率$ f $和阻尼比$ \xi $

Table 5. Fundamental frequency$ f $ and damping ratio $ \xi $ of the rubber geopolymer concrete cantilever beam

$ {y}_{i} /$mm	GC		5%R/GC		10%R/GC		15%R/GC
$ {y}_{i} /$mm	$ f /$Hz	$ \xi /$%	$ f /$Hz	$ \xi /$%	$ f /$Hz	$ \xi /$%	$ f /$Hz	$ \xi /$%
0	79.5	1.03	77.0	1.26	76.8	1.74	75.5	1.88
5	73.5	1.26	74.0	1.83	71.5	2.20	68.5	2.34
10	70.0	1.84	70.0	2.78	69.0	2.98	55.2	4.67
20	65.0	2.46	63.0	3.65	61.2	3.54	51.4	4.44
30	61.0	2.19	58.5	2.16	53.6	3.21	48.5	3.32
40	59.0	1.96	54.0	1.86	47.5	2.44	45.2	2.84
Note: $ {y}_{i} $—Damage control displacement and the damage control displacement is 0 mm, 5 mm, 10 mm, 20 mm, 30 mm and 40 mm, which are respectively recorded as $ {y}_{0} $-$ {y}_{5} $.

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