EXPERIMENTAL STUDY ON THE INTERFACIAL SHEAR STRENGTH BETWEEN ULTRA-HIGH TOUGHNESS CEMENTITIOUS COMPOSITES AND REACTIVE POWDER CONCRETE
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摘要: 该研究使用双面剪切试验对500 d长龄期的超高韧性水泥基复合材料(UHTCC)、活性粉末混凝土(RPC)和UHTCC/RPC界面的剪切强度进行了测试，并结合数字图像相关技术对其破坏过程进行了观测。结果表明，UHTCC、RPC和UHTCC/RPC界面均表现出良好的剪切延性，在加载过程中均未发生脆性破坏。此外，改进浇筑工艺和提高粘结界面的粗糙度均能够提高UHTCC/RPC界面剪切强度。将现有的界面剪切强度计算经验公式与试验结果对比发现现有的经验公式无法准确预测UHTCC/RPC的界面剪切强度。该研究建立了UHTCC/RPC界面剪切试验的有限元分析模型，并使用COHESIVE单元模拟界面行为，模拟结果与试验结果吻合较好。
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关键词:
- 超高韧性水泥基复合材料 /
- 活性粉末混凝土 /
- 界面剪切强度 /
- 有限元分析 /
- 数字图像相关技术
Abstract: In this study, the shear strength of 500-day long-age ultra-high toughness cementitious composites (UHTCC), reactive powder concrete (RPC), and the interface of UHTCC/RPC was tested by double-shear test. The failure process was observed by the digital image correlation technique. The results show that the UHTCC, RPC, and the interface of UHTCC/RPC exhibit good shear toughness and no brittle failure during loading. In addition, the improved casting process and increased roughness of the interface can increase the interfacial shear strength of UHTCC/RPC. Comparison of the existing empirical formulas for calculating the interfacial shear strength with the test results revealed that the existing empirical formulas could not predict the interfacial shear strength of UHTCC/RPC accurately. A finite element analysis model of UHTCC/RPC interface shear test was established and the interfacial behavior was modelled by COHESIVE elements. The simulation results were in good agreement with the test results. -
图 1 功能梯度受弯构件的界面处存在剪力
Figure 1. Shear force at interface of a functional grade flexural member
图 7 RPC与UHTCC剪切试验试件的主应变
Figure 7. Principal strain of RPC and UHTCC shear test specimens
图 8 界面剪切试验试件在不同加载阶段的主应变(IST-WH-N)
Figure 8. Principal strain of interfacial shear specimens at different loading stages (IST-WH-N)
图 10 各试验组的平均剪切强度或界面剪切强度
Figure 10. Average shear strength or interfacial shear strength of test groups
图 11 ABAQUS中COHESIVE单元的牵引-分离法则
Figure 11. Traction-separation response of COHESIVE element in ABAQUS
表 1 纤维的性能指标
Table 1. Properties of fibers
性能指标 PVA纤维 钢纤维 长度/mm 12 13 直径/mm 0.04 0.21 拉伸强度/MPa 1620 2750 弹性模量/GPa 42.8 206 伸长率/(%) 7 − 质量密度/(kg/m3) 1300 7800 
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表 2 UHTCC与RPC的基本力学性能汇总
Table 2. Summaries of basic mechanical properties of UHTCC and RPC
性能指标 UHTCC RPC 平均抗拉强度/MPa 4.28 ± 0.22 10.43 ± 0.58 平均极限拉伸应变/(%) ≈ 3.2 ≈ 0.3 平均立方体抗压强度/MPa 58.48 ± 3.28 146.94 ± 5.47 平均抗折强度/MPa 28.83 ± 0.58 51.51 ± 3.12
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表 3 试件信息
Table 3. Details of specimens
编号 试验内容 浇筑方式 界面粗糙度 ST-UHTCC 材料剪切强度 一次性浇筑 − ST-RPC 材料剪切强度 一次性浇筑 − IST-WW 界面剪切强度 先浇筑UHTCC，
在其初凝前于其上浇筑RPC无 IST-WH-N 界面剪切强度 在硬化UHTCC上浇筑RPC 无 IST-WH-L 界面剪切强度 在硬化UHTCC上浇筑RPC 低 IST-WH-H 界面剪切强度 在硬化UHTCC上浇筑RPC 高
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表 4 双剪强度
Table 4. Double-shear strength
试验组别 双剪强度/MPa 平均值/
MPa标准差/
MPa平均值与UHTCC
剪切强度的比值试件1 试件2 试件3 ST-UHTCC 6.56 6.23 5.81 6.20 0.31 1.00 ST-RPC 20.87 19.91 19.88 20.22 0.46 3.26 IST-WW 3.84 4.53 4.37 4.25 0.29 0.69 IST-WH-N 1.23 1.20 1.26 1.23 0.02 0.20 IST-WH-L 1.92 1.83 1.73 1.82 0.08 0.29 IST-WH-H 3.64 3.26 3.37 3.42 0.16 0.55
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表 6 不同界面特性下c的取值
Table 6. Value of c under different interface characteristics
浇筑方式 界面粗糙度 c 先浇筑UHTCC，
在其初凝前于其上浇筑RPC− 0.59 在硬化UHTCC上浇筑RPC 光滑 0.17 在硬化UHTCC上浇筑RPC 低粗糙度 (Rt=1.0 mm) 0.25 在硬化UHTCC上浇筑RPC 高粗糙度 (Rt=1.4 mm) 0.46
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