中高温及低温作用后超高韧性水泥基复合材料的力学性能

钱维民; 苏骏; 史庆轩; 李扬; 嵇威

doi:10.13801/j.cnki.fhclxb.20230811.001

中高温及低温作用后超高韧性水泥基复合材料的力学性能

doi: 10.13801/j.cnki.fhclxb.20230811.001

钱维民^{1, 2},
苏骏^2, ,,
史庆轩¹,
李扬²,
嵇威²

1.
西安建筑科技大学　土木工程学院，西安 710055
2.
湖北工业大学　土木建筑与环境学院，武汉 430068

基金项目: 国家自然科学基金(52178505；51878540)；湖北省自然科学基金(2020CFB860)

详细信息

通讯作者:
苏骏，博士，教授，硕士生导师，研究方向为纤维混凝土及工程结构抗震　E-mail: sujun930@163.com

中图分类号: TB332
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- 被引次数: 0
出版历程
- 收稿日期: 2023-06-05
- 修回日期: 2023-07-18
- 录用日期: 2023-07-31
- 网络出版日期: 2023-08-14
- 刊出日期: 2024-04-15

Study on mechanical properties of ultra-high toughness cementitious composites after medium-high temperature and low temperature

QIAN Weimin^{1, 2},
SU Jun^{2
, ,},
SHI Qingxuan¹,
LI Yang²,
JI Wei²

1.
School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
2.
School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan 430068, China

Funds: National Natural Science Foundation of China (52178505; 51878540); Natural Science Foundation of Hubei Province of China (2020CFB860)

摘要

摘要: 为研究超高韧性水泥基复合材料(UHTCC)在200~−100℃温度作用后的力学性能，设计了不同纤维体积掺量的UHTCC，经中高温和低温作用后进行基本力学性能试验，通过UHTCC强度和变形等参数评价了中高温和低温作用后UHTCC的力学性能。结果表明：纤维的掺入能有效改善基体的脆性，提升材料的韧性；同时温度作用导致材料内部出现初始缺陷，对UHTCC的力学性能有明显的影响，且低温作用的影响要明显高于高温作用，当温度降低至−100℃时，UHTCC强度最大降低约75%，变形最大降低约92%，但温度作用未对UHTCC的泊松比产生明显影响。在此基础上提出了中高温及低温作用后UHTCC轴压和轴拉应力-应变关系回归模型，为UHTCC材料在极端温度环境下的性能设计和工程应用提供参考。
- 超高韧性水泥基复合材料 /
- 中高温 /
- 低温 /
- 力学性能 /
- 本构模型
Abstract: In order to study the mechanical properties of ultra-high toughness cementitious composites (UHTCC) after temperatures of 200-−100℃, UHTCC with different fiber volume content was designed. The basic mechanical properties of UHTCC after medium-high temperatures and cryogenic temperatures were tested, and the mechanical properties of UHTCC after medium-high temperatures and cryogenic temperatures were evaluated by parameters such as strength and deformation of UHTCC. The results show that the incorporation of fibers can effectively improve the brittleness of the material and enhance the toughness of the material. The temperature effect makes the initial defects appear inside the material, which has a significant effect on the mechanical properties of UHTCC, and the effect of low temperature is significantly higher than that of high temperature. When the temperature is reduced to −100℃, the strength of UHTCC is reduced by about 71% at most, and the deformation is reduced by about 92% at most, but the temperature has no significant effect on the Poisson's ratio of UHTCC. On this basis, the regression model of axial compression and axial tensile stress-strain relationship of UHTCC after medium-high temperatures and cryogenic temperatures is proposed, which provides a reference for the performance design and engineering application of UHTCC materials at extreme temperatures.
- ultra-high toughness cementitious composites /
- medium-high temperatures /
- cryogenic temperatures /
- mechanical properties /
- constitutive model

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图 1 试件尺寸与纤维形态

Figure 1. Specimen size and fiber morphology

PVA—Polyvinyl alcohol

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图 2 极端温度设备

Figure 2. Extreme temperature equipment

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图 3 加载装置示意图

Figure 3. Sketches of the test setup

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图 4 试件抗压破坏形态

Figure 4. Compressive failure mode of specimens

UHTCC—Ultra high toughness cementitious composites

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图 5 UHTCC抗压强度和强度损失率

Figure 5. Compressive strength and strength loss ratio of UHTCC

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图 6 试件劈拉试验破坏形态

Figure 6. Specimen splitting tensile failure mode

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图 7 UHTCC劈拉强度和强度损失率

Figure 7. Splitting tensile strength and strength loss ratio of UHTCC

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图 8 不同影响因素下UHTCC应力-应变曲线

Figure 8. UHTCC stress-strain curves under different influencing factors

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图 9 UHTCC抗压强度与轴压强度转换系数

Figure 9. UHTCC compression strength and axial compression strength conversion coefficient

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图 10 UHTCC泊松比

Figure 10. Poisson’s ratio of UHTCC

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图 11 UHTCC弹性模量

Figure 11. Elastic modulus of UHTCC

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图 12 UHTCC修正弹性模量计算值与试验值对比

Figure 12. Comparison of calculated and experimental values of UHTCC modified elastic modulus

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图 13 UHTCC破坏形态

Figure 13. Fracture morphology of UHTCC

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图 14 UHTCC应力-应变曲线

Figure 14. Stress-strain curves of UHTCC

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图 15 不同影响因素下UHTCC峰值应力、峰值应变的试验值与计算值

Figure 15. Experimental and calculated values of peak stress and peak strain of UHTCC under different influencing factors

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图 16 UHTCC受压计算模型与试验值对比

Figure 16. Comparison between UHTCC compression calculation model and experimental values

ECC—Engineered cementitious composites

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图 17 UHTCC受拉应力和应变

Figure 17. Tensile stress and strain of UHTCC

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图 18 UHTCC试验曲线与计算曲线对比

Figure 18. Comparison of test curves and calculation curves of UHTCC

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图 19 混凝土的热应变行为^[29]

Figure 19. Cooling-heating thermal strain behavior of concrete^[29]

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图 20 UHTCC低温损伤演化示意图

Figure 20. Cryogenic temperatures damage evolution of UHTCC

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图 21 UHTCC高温损伤示意图

Figure 21. High temperature damage diagram of UHTCC

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图 22 UHTCC的SEM图像

Figure 22. SEM images of UHTCC

C-S-H—Hydrate calcium silicate

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表 1 水泥、粉煤灰和硅灰的物理化学性质

Table 1. Physical and chemical properties of cement, fly ash and silica fume

Binder	Constituent mass fraction/wt%						Specific surface area/(cm²·g⁻¹)	Density/(g·cm⁻³)
Binder	CaO	Al₂O₃	SiO₂	Fe₂O₃	MgO	SO₃	Specific surface area/(cm²·g⁻¹)	Density/(g·cm⁻³)
Cement	64.94	4.50	19.58	3.20	2.14	3.06	3413	3.15
Fly ash	2.44	30.63	48.74	2.61	1.21	1.02	8000	1.90
Silica fume	4.32	0.42	93.52	0.18	0.34	0.15	200000	2.20

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表 2 材料配比

Table 2. Ratio of materials

Fly ash/(kg·m⁻³)	Cement/(kg·m⁻³)	Sand/(kg·m⁻³)	Silica fume/(kg·m⁻³)	Water/(kg·m⁻³)	Water reducer/(kg·m⁻³)	Fiber content/vol%
811.6	493.0	386.7	13.3	313.1	4.2	0, 0.5, 1.0, 1.5, 2.0

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表 3 聚乙烯醇(PVA)纤维性能指标

Table 3. Polyvinyl alcohol (PVA) fiber performance index

Model	Density/(g·cm⁻³)	Diameter/mm	Length/mm	Elastic modulus/GPa	Tensile strength/MPa	Elongation/%
REC15×12	1.3	0.04	12	42.8	1620	6

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表 4 UHTCC强度转换系数α

Table 4. Strength conversion coefficient α of UHTCC

T/℃	α
200	0.73
100	0.73
20	0.77
−25	0.76
−50	0.74
−75	0.74
−100	0.76
Note: T—Temperature.

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