Experimental Study of Environmental Conditions on In-Situ Engineered Cementitious Composites-Steel Deck Interface
Abstract
:1. Introduction
2. Materials and Experiments
2.1. Materials
2.2. Specimen Preparation
2.3. Mechanical Performance of ECC
2.4. Bonding Properties of Steel/ECC Interface
2.4.1. Single Shear Test
2.4.2. Pull-Off Test
2.4.3. Inclined Shear Test
2.5. Effects of Hostile Environment on Interfacial Properties
2.6. Microscopic Interface Observation
3. Results and Discussion
3.1. Mechanical Properties of ECC
3.2. Failure Mode of Steel-ECC Interface
3.3. Effect of Freeze-Thaw on Interfacial Strength
3.4. Effect of Hydrothermal Aging on Interfacial Strength
3.5. Criterion of Interfacial Failure Based on Inclined Shear Test
- (1)
- The initiation of interface failure occurs at the maximum interfacial shear stress.
- (2)
- The initiation of interface failure is influenced by normal stress at the interface. The greater the interfacial compressive stress, the greater the maximum interfacial shear stress.
- (3)
- The interface failure criterion is similar to Mohr–Coulomb criterion (shown in Figure 13b), i. e., the effect of interface compressive stress on the maximum interface shear stress is linear when failure occurs. The criterion is found to exclude the effect of experimental conditions and reflect the intrinsic strength characteristics of interface.
3.6. Micromechanism of Bonding Property Reduction
4. Conclusions
- (1)
- Wet-bonding technology using epoxy adhesive can provide a convenient alternative to the traditional mechanical shear key bonding method and introduce opportunities to develop new overlay structures for orthotropic steel deck bridges.
- (2)
- The interfacial shear and pull-off strength decrease with an increase in the freeze-thaw cycles and with the duration of immersion in hot and humid environment. The strength is approximately linear with the number of freeze-thaw cycles. Perfect fitting can be obtained while using a quadratic polynomial to fit the relationship between strength and duration of immersion in hot water.
- (3)
- The SEM images show the presence of microvoids or microcracks at the interface. Exposure to freeze-thaw cycles and hot and humid environment increased interfacial defects. The presence of water reduces the effective bearing area, worsens the interface bonding ability, and degrades the macroperformance.
- (4)
- The interfacial shear stress is linear with the normal stress. The failure criterion under normal stress for the steel-ECC bonding interface can be obtained as , which is similar to Mohr–Coulomb criterion.
Author Contributions
Funding
Conflicts of Interest
References
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Material | Chemical Components (by Weight, %) | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
SiO2 | CaO | Al2O3 | Fe2O3 | SO3 | P2O5 | K2O | Na2O | TiO2 | MgO | |
Cement | 21.26 | 57.82 | 7.67 | 2.88 | 4.04 | 5.26 | 0.78 | - | 0.21 | - |
Fly ash | 56.18 | 2.82 | 31.46 | 3.85 | 0.69 | 0.91 | - | 1.32 | - | 1.33 |
Diameter (μm) | Length (mm) | Elongation (%) | Density (g/cm3) | Elastic Modulus (GPa) | Tensile Strength (MPa) |
---|---|---|---|---|---|
35 | 12 | 7.3 | 1.3 | 31.3 | 1287 |
Cement | Fly Ash | Water | Sand | Fiber | Water Reducer |
---|---|---|---|---|---|
479 | 719 | 359 | 431 | 26 | 9.6 |
Strength (MPa) | Modulus(GPa) | Elongation Rate | ||||
---|---|---|---|---|---|---|
Tension | Compression | Shear | Tension | Compression | Shear | |
25 | 75 | 8.9 | 4.6 | 5.0 | 3.05 | 0.30% |
Inclination Angle (°) | Shear Strength (MPa) | Normal Stress (MPa) | ||||
---|---|---|---|---|---|---|
Measured Value | Mean Value | Standard Deviation | Measured Value | Mean Value | Standard Deviation | |
26.57 | 7.653 | 7.439 | 0.235 | 6.845 | 6.654 | 0.211 |
7.187 | 6.428 | |||||
7.477 | 6.687 | |||||
38.66 | 3.925 | 4.119 | 0.223 | 3.065 | 3.217 | 0.174 |
4.363 | 3.407 | |||||
4.069 | 3.177 | |||||
45.00 | 2.988 | 3.193 | 0.206 | 2.113 | 2.258 | 0.146 |
3.192 | 2.257 | |||||
3.399 | 2.404 | |||||
90.00 | 1.564 | 1.525 | 0.034 | 0.000 | 0.000 | 0.000 |
1.503 | 0.000 | |||||
1.507 | 0.000 |
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Wu, S.; Sun, X.; Yang, J.; Yang, R.; Zhu, J. Experimental Study of Environmental Conditions on In-Situ Engineered Cementitious Composites-Steel Deck Interface. Appl. Sci. 2020, 10, 2123. https://doi.org/10.3390/app10062123
Wu S, Sun X, Yang J, Yang R, Zhu J. Experimental Study of Environmental Conditions on In-Situ Engineered Cementitious Composites-Steel Deck Interface. Applied Sciences. 2020; 10(6):2123. https://doi.org/10.3390/app10062123
Chicago/Turabian StyleWu, Shuyin, Xiaoyin Sun, Jun Yang, Ruochong Yang, and Jipeng Zhu. 2020. "Experimental Study of Environmental Conditions on In-Situ Engineered Cementitious Composites-Steel Deck Interface" Applied Sciences 10, no. 6: 2123. https://doi.org/10.3390/app10062123