再生PET塑料骨料砂浆的弯曲韧性及阻尼特性

鲍聪; 赵晓钦; 樊伟; 梁超锋; 占海华

doi:10.13801/j.cnki.fhclxb.20220623.002

再生PET塑料骨料砂浆的弯曲韧性及阻尼特性

doi: 10.13801/j.cnki.fhclxb.20220623.002

鲍聪^{1, 2},
赵晓钦²,
樊伟²,
梁超锋^{1, 3, ,},
占海华⁴

1.
绍兴文理学院　土木工程学院，绍兴 312000
2.
浙江精工钢结构集团有限公司，绍兴 312030
3.
同济大学　建筑工程系，上海 200092
4.
绍兴文理学院　纺织服装学院，绍兴 312000

基金项目: 浙江省自然科学基金项目(LGF22 E080035)；住房与城乡建设部科技研发项目(2021-K-123)；绍兴市揭榜挂帅专项基金(2021 B41003)

详细信息

通讯作者:
梁超锋，博士，教授，硕士生导师，研究方向为水泥基材料动力特性　E-mail: liangcf@tongji.edu.cn

中图分类号: TU528.57
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出版历程
- 收稿日期: 2022-04-22
- 修回日期: 2022-05-30
- 录用日期: 2022-06-12
- 网络出版日期: 2022-06-24
- 刊出日期: 2023-04-15

Flexural toughness and damping property of recycled PET plastic aggregate mortar

BAO Cong^{1, 2},
ZHAO Xiaoqin²,
FAN Wei²,
LIANG Chaofeng^{1, 3
, ,},
ZHAN Haihua⁴

1.
School of Civil Engineering, Shaoxing University, Shaoxing 312000, China
2.
Zhejiang Jinggong Steel Building CO., LTD., Shaoxing 312030, China
3.
Department of Structural Engineering, Tongji University, Shanghai 200092, China
4.
College of Textile and Garment , Shaoxing University, Shaoxing 312000, China

Funds: Natural Science Foundation of Zhejiang Province (LGF22 E080035); Science and Technology R&D Project of the Ministry of Housing and Urban Rural Development (2021-K-123); The Special Fundation of Shaoxing Science Technology Bureau (2021 B41003)

摘要

摘要: 为研究再生聚对苯二甲酸乙二醇酯(PET)塑料骨料砂浆(RPAM)的弯曲韧性及阻尼特性，利用废弃PET塑料制备再生PET塑料骨料(RPA)，以RPA取代率为参变量，开展了RPAM三点弯曲加载试验和悬挂梁弯曲自由振动试验，分析了三点弯曲RPAM荷载-挠度全曲线与弯曲韧性、弯曲振动一阶阻尼比与频率随RPA取代率的演变规律，并通过SEM测试RPA界面特征，分析其阻尼机制。结果表明：随RPA取代率增加RPAM延性增加，荷载-挠度曲线上升段和下降段斜率逐渐降低，初裂强度和抗弯强度降低；RPA的掺入使得RPAM破坏更具延性，初裂挠度和峰值挠度均明显增大，韧性指数I₅、I₁₀ 、I₂₀分别比普通砂浆提高4.17倍、5.65倍、5.89倍，且RPAM的剩余强度随RPA取代率增加逐渐增大；随RPA取代率增加，RPAM一阶频率降低9.0%~25.9%，阻尼比增加11.3%~58.1%；RPA与水泥基体之间的界面过渡区(ITZ)微观结构疏松，ITZ界面滑移与摩擦作用及RPA的黏性增加了RPAM的阻尼耗能；RPA最佳用量为15.5vol%~17.2vol%。
- 再生PET塑料骨料砂浆 /
- 荷载-挠度曲线 /
- 韧性指数 /
- 延性 /
- 阻尼比 /
- 频率 /
- 界面过渡区 /
- 阻尼机制
Abstract: In order to study the flexural toughness and damping characteristics of recycled polyethylene terephthalate (PET) plastic aggregate mortar (RPAM), the recycled PET plastic aggregate (RPA) was prepared from the wasted PET plastics. Taking RPA substitution rate as the variable, the three-point bending loading test and the suspension beam bending free vibration test on RPAM were carried out. The load-deflection curve, flexural toughness, first-order damping ratio and frequency of RPAM with different RPA substitution rates were analyzed. Besides, the damping mechanism of RPA interface was analyzed based on the SEM test. The results show that with the increase of RPA substitution rate, the ductility of RPAM increases, the slopes of loading branch and unloading branch of load-deflection curve gradually decrease, and the initial crack strength and flexural strength decrease. The addition of RPA makes the failure of RPAM more ductile, which increases the initial crack deflection and peak deflection significantly. The toughness indexes I₅, I₁₀ and I₂₀ are 4.17, 5.65 and 5.89 times larger than that of ordinary mortar, respectively. The residual strength of RPAM increases gradually as the RPA substitution rate increasing. With the increase of RPA substitution rate, the first-order frequency of RPAM decreases by 9.0%-25.9%, while the damping ratio increases by 11.3%-58.1%. The micro structure of interface transition zone (ITZ) between RPA and cement matrix is loose. The slippage and friction of the ITZ and the viscosity of RPA increase the damping energy consumption of RPAM, and the recommended dosage of RPA is in the range of 15.5vol%-17.2vol%.
- recycled PET plastic aggregate mortar /
- load-deflection curve /
- toughness index /
- ductility /
- damping ratio /
- frequency /
- interface transition zone /
- damping mechanism

HTML全文

图 1 再生聚对苯二甲酸乙二醇酯(PET)塑料骨料

Figure 1. Recycled polyethylene terephthalate (PET) plastic aggregate

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图 2 骨料级配曲线

Figure 2. Aggregate grading curves

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图 3 三点弯曲试验装置

Figure 3. Three-point bending test device

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图 4 韧性指数计算简图

Figure 4. Calculation diagram of toughness index

δ—Initial crack deflection

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图 5 RPAM荷载-挠度曲线初裂点确定方法

Figure 5. Determination method of initial crack points of RPAM load-deflection curve

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图 6 阻尼测试装置及其示意图

Figure 6. Damping testing device and its schematic diagram

L—Specimen length

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图 7 RPAM加速度时程及其频率图谱

Figure 7. Acceleration history and frequency spectrum of RPAM

H—Resonance peak; f_n—Natural frequency

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图 8 RPAM弯曲破坏形态：(a) RPAM破坏断面；(b) 局部形态

Figure 8. Flexural failure mode of RPAM: (a) Broken section of RPAM; (b) Local morphology

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图 9 RPAM荷载-挠度曲线

Figure 9. Load-deflection curves of RPAM

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图 10 RPAM初裂挠度和峰值挠度

Figure 10. Initial crack deflection and peak deflection of RPAM

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图 11 RPAM初裂强度和抗弯强度

Figure 11. Initial crack strength and flexural strength of RPAM

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图 12 RPAM一阶频率

Figure 12. First order natural frequency of RPAM

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图 13 RPAM一阶阻尼比

Figure 13. First order damping ratio of RPAM

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图 14 NC和P40试件的微观结构

Figure 14. Microstructures of NC and P40 specimens

ITZ—Interfacial transition zone; C-S-H—Hydrate calcium silicate

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图 15 RPAM孔隙率^[40]

Figure 15. RPAM porosity^[40]

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图 16 RPAM各性能指标与RPA取代率关系

Figure 16. Relationship between RPAM performance indexes and RPA substitution rate

σ—Peak stress of RPAM; σ_m—Maximum peak stress; f—Flexural strength of RPAM; f_m—Maximum flexural strength; δ—Peak deflection of RPAM; δ_m—Maximum peak deflection; ζ—RPAM damping ratio of RPAM; ζ_m—Maximum damping ratio

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表 1 水泥化学成分

Table 1. Chemical composition of cement wt%

NaO	MgO	Al₂O₃	SiO₂	P₂O₅	K₂O	CaO	Fe₂O₃
0.37	1.80	5.41	14.24	0.51	0.89	64.74	2.46

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表 2 骨料基本性能

Table 2. Basic properties of aggregates

Aggregate type	Water content/wt%	Water absorption/wt%	Apparent density/(kg·m⁻³)	Modulus of elasticity/GPa	Tensile strength/MPa
River sand	1.0	1.2	2580	47.5	—
RPA	0	0.2	1350	3.3	60
Note: RPA—Recycled PET plastic aggregate.

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表 3 再生PET塑料骨料砂浆(RPAM)配合比

Table 3. Mixture proportion of recycled PET plastic aggregate mortar (RPAM)

Mixture	PRA replacement ratio/vol%	Material consumption/(kg·m⁻³)
Mixture	PRA replacement ratio/vol%	Cement	Water	Sand	RPA	Water reducer
NC	0	731	300	1217.0	0.0	1.59
P10	10	731	300	1095.3	63.7	1.42
P20	20	731	300	973.6	127.4	1.45
P30	30	731	300	851.9	191.0	1.40
P40	40	731	300	730.2	254.7	1.27
Notes: NC—Mortar with RPA volume substitution ratio of 0vol%; P10, P20, P30 and P40—Mortars with RPA volume substitution ratio of 10vol%, 20vol%, 30vol% and 40vol%, respectively.

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表 4 RPAM弯曲韧性

Table 4. Flexural toughness of RPAM

Mixture	I₅/%	I₁₀/%	I₂₀/%	R_5,10	R_10,20
NC	1.49	1.49	1.49	0	0
P10	2.78	3.04	3.04	5.2	0
P20	4.58	5.59	5.59	20.2	0
P30	5.28	6.62	6.63	26.8	0.1
P40	6.21	8.42	8.77	44.2	3.5
Notes: I—Toughness index; I₅, I₁₀, I₂₀—Corresponds to mid-span deflection 3δ, 5.5δ, 10δ; R—Residual strength.

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