全固废煤矸石集料LUHPC外包钢管推移试验与黏结性能

付军; 杨淼; 邱鸿安; 孙钊; 丁庆军; 张高展

doi:10.19818/j.cnki.1671-1637.2025.05.017

全固废煤矸石集料LUHPC外包钢管推移试验与黏结性能

doi: 10.19818/j.cnki.1671-1637.2025.05.017

付军^{1, 2, ,},
杨淼¹,
邱鸿安¹,
孙钊¹,
丁庆军²,
张高展³

1.
武汉理工大学交通与船海工程学部，湖北武汉 430063
2.
武汉理工大学硅酸盐建筑材料国家重点实验室，湖北武汉 430063
3.
安徽建筑大学材料与化学工程学院，安徽合肥 230601

基金项目:

国家自然科学基金项目 U21A20149

详细信息

作者简介:
付军(1972-)，男，湖北武汉人，武汉理工大学教授，工学博士，从事基础设施新材料与新结构研究

通讯作者:
FU Jun (1972-), male, professor, PhD, fjgrant@whut.edu.cn

中图分类号: U444
计量
- 文章访问数: 49
- HTML全文浏览量: 16
- PDF下载量: 3
- 被引次数: 0
出版历程
- 收稿日期: 2024-07-19
- 录用日期: 2025-03-15
- 修回日期: 2024-11-10
- 刊出日期: 2025-10-28

Pushing test and bonding performance of LUHPC outsourcing steel tube with all-solid waste coal gangue aggregate

1.
Faculty of Transportation and Marine Engineering, Wuhan University of Technology, Wuhan 430063, Hubei, China
2.
State Key Laboratory of Silicate Building Materials, Wuhan University of Technology, Wuhan 430063, Hubei, China
3.
School of Materials and Chemical Engineering, Anhui Jianzhu University, Hefei 230601, Anhui, China

Funds:

National Natural Science Foundation of China U21A20149

Article Text (Baidu Translation)

摘要

摘要: 利用全固废煤矸石集料制备出密度低于2 100 kg·m^-3的轻质超高性能混凝土(LUHPC)，并对LUHPC进行力学性能测试，分析了其损伤本构模型并测得其准静态及动态抗压强度，研究了钢管与外包LUHPC的界面黏结与抗推移性能；按1∶6的比例制备与工程原型结构相同的缩尺模型，并在缩尺形式下进行全固废煤矸石集料LUHPC钢管混凝土推移试验，观察缩尺模型的加载过程和破坏形态，整理了试验数据并绘制了荷载-滑移曲线进行界面抗剪黏结强度分析；采用ABAQUS建立了LUHPC-钢管混凝土有限元模型，通过有限元对试验进行多参数分析。测试结果表明：制备出含全固废煤矸石集料的LUHPC，其准静态加载强度为92.20 MPa，动态抗压强度相比准静态增加13%~40%；通过分析损伤本构模型得出其中峰值应力取109 MPa，应变取3.4×10^-3，弹性模量取37.5 GPa；LUHPC-钢管混凝土中，LUHPC低水胶比胶凝材料提供了较高强度的黏结效应，协同钢纤维有效增强了钢管界面黏结性能，其黏结强度达1.96 MPa，远高于普通混凝土，有利于提升结构的安全性与完整性；通过考虑混凝土塑性损伤和钢材延性损伤的有限元模拟分析，得到推移试件模型加载全过程的荷载-滑移曲线，与试验曲线相吻合；可通过调节LUHPC外包钢管的相关设计参数，提升试件抗推移与黏结性能。
- 桥梁工程 /
- 钢-混凝土结构 /
- 推移试验 /
- LUHPC /
- 外包混凝土与钢管界面 /
- 全固废煤矸石集料 /
- 黏结抗剪强度
Abstract: Lightweight ultra-high performance concrete (LUHPC) with a density lower than 2 100 kg·m^-3 was prepared by using all-solid waste coal gangue aggregates. The mechanical properties of LUHPC were tested. Its damage constitutive model was analyzed, and the quasi-static and dynamic compressive strengths were measured. The interface bonding and pushing resistance performance between the steel tubes and the encased LUHPC were investigated. A scaled-down model of the engineering prototype structure in a 1∶6 ratio was prepared. A pushing test on the all-solid waste coal gangue aggregate LUHPC concrete was conducted using the scaled-down model in the reduced scale. The loading process and failure modes of the scaled-down model were observed. The interface shear adhesion strength was analyzed by compiling and drawing the load-slip curve diagram. The ABAQUS was employed to establish a finite element model of LUHPC-steel pipe concrete. A multi-parameter analysis of the test was carried out using finite element method. Test results show that the quasi-static loading strength of LUHPC containing waste coal gangue aggregate is 92.20 MPa. The dynamic compressive strength increases by 13%~40% compared with the quasi-static strength. Based on the damage constitutive model analysis, the peak stress is 109 MPa, the strain is 3.4×10^-3, and the elastic modulus is 37.5 GPa. For the LUHPC-steel tube concrete, the low water-binder ratio in the LUHPC binder material provides a strong bonding effect, and the inclusion of steel fibers effectively enhances the bond performance at the steel tube interface. The bonding strength reaches 1.96 MPa, significantly higher than that of ordinary concrete, which contributes to improved structural safety and integrity. The finite element simulation analysis, considering concrete plastic damage and steel ductile damage, yields a load-slip curve for the entire loading process of the pushing specimen model, which aligns with the experimental curve. The pushing resistance and bonding performance of the specimen can be improved by adjusting the design parameters of the LUHPC-encased steel tube.
- bridge engineering /
- steel-concrete structure /
- pushing test /
- LUHPC /
- outer concrete and steel tube interface /
- all-solid waste coal gangue aggregate /
- bond shear strength

HTML全文

图 1 LUHPC单轴受压应力-应变曲线

Figure 1. Uniaxial compressive stress-strain curve of LUHPC

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图 2 抗压强度平均值与应变率关系

Figure 2. Relationship between average value of compressive strength and strain rate

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图 3 Weibull分布模型与试验数据对比

Figure 3. Comparison of Weibull distribution model and experimental data

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图 4 推移试件构造(单位：mm)

Figure 4. Structure of pushing specimen (unit: mm)

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图 5 推移试件制作流程

Figure 5. Production process of pushing specimen

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图 6 试验装置

Figure 6. Test setup

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图 7 试件整体破坏

Figure 7. Overall failure of specimen

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图 8 试件加载端及破坏细节

Figure 8. Loading end and failure detail of specimen

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图 9 试件自由端及破坏细节

Figure 9. Details of free end and failure detail of specimen

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图 10 荷载-滑移曲线

Figure 10. Load-slip curves

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图 11 LUHPC试件及普通混凝土损伤

Figure 11. Damage of LUHPC specimen and ordinary concrete

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图 12 试件有限元模型

Figure 12. Finite element model of specimen

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图 13 荷载-滑移曲线试验值与有限元模拟值

Figure 13. Test values and finite element simulation values of load-slip curves

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图 14 试件剖面

Figure 14. Section view of specimen

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图 15 不同收缩情况下最大竖向荷载

Figure 15. Maximum vertical load under different degrees of self-shrinkage

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图 16 不同LUHPC厚度下最大竖向力

Figure 16. Maximum vertical force at different thicknesses of LUHPC

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图 17 不同LUHPC弹性模量下最大竖向力

Figure 17. Maximum vertical force under different elastic moduli of LUHPC

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表 1 LUHPC基本配合比

Table 1. LUHPC basic mix proportion kg·m^-3

水泥	微珠	硅灰	固废煤矸石集料	钢纤维	水	减水剂
710~713	148~150	184~185	900~903	130~132	187~189	21~23

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表 2 煤矸石主要化学成分

Table 2. Main chemical composition of coal gangue %

化学成分	SiO₂	Al₂O₃	Fe₂O₃	CaO	MgO	Na₂O	K₂O	Loi
质量百分比	59.78	29.35	1.44	0.68	0.51	0.08	1.76	0.76

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表 3 煤矸石的物理性质

Table 3. Physical properties of coal gangue

物理性质	粒径/mm	吸水率/ %	筒压强度/ MPa	堆积密度/ (kg·m^-3)
数值	0.15~4.75	≥10	≥10	≤1 100

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