Study on mechanical properties of ultra-high toughness cementitious composites after medium-high temperature and low temperature
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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。
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关键词:
- 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. -
图 4 试件抗压破坏形态
Figure 4. Compressive failure mode of specimens
UHTCC—Ultra high toughness cementitious composites
图 7 UHTCC劈拉强度和强度损失率
Figure 7. Splitting tensile strength and strength loss ratio of UHTCC
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
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
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
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
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
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
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) CaO Al2O3 SiO2 Fe2O3 MgO SO3 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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