Dynamic Compressive Mechanical Properties of UR50 Ultra-Early-Strength Cement-Based Concrete Material under High Strain Rate on SHPB Test
Abstract
:1. Introduction
2. UR50 Ultra-Early-Strength Concrete Material
3. Dynamic Test with SHPB
3.1. Experimental Specimen
3.2. Experimental Device
3.3. Experimental Design
3.4. Calibration of SHPB
4. Test Results
4.1. Average Strain Rate of 7.5 s−1
4.2. Average Strain Rate of 15.3 s−1
4.3. Average Strain Rate of 23.5 s−1
5. Discussion
5.1. Strain Rate Effect and Analysis of Compressive Strength
5.2. Energy Absorption Density Analysis
5.3. Damage Evolution Process Analysis
6. Conclusions
- (1)
- Under different loading conditions, different types of copper sheets were selected as the shaper to eliminate the dispersion effect. Under the same impact velocity, the stress–strain curves of the three specimens are in good agreement, which ensures the validity and reliability of the experimental results;
- (2)
- The compression brittleness of ultra-early-strength cement-based specimens is relatively large, and the failure mode is a mainly brittle fracture, and with the increase of loading speed, the failure mode of the specimens gradually transited from larger fragments to small fragments, with an eventual large amount of powder;
- (3)
- The dynamic compressive strength of ultra-early-strength cement-based materials increases with the increase of the strain rate, which has an obvious strain rate strengthening effect. Fitting determines the relationship curve between the dynamic increase factor, DIF, and the strain rate. It has a linear relationship with the logarithm of the strain rate. The higher the strain rate, the larger the DIF, indicating that it has the advantage of impact-resistant mechanical properties;
- (4)
- The concept of absorption density is introduced to facilitate a better understanding of the toughness of ultra-early-strength cement-based materials. As the impact velocity increases, the peak stress rises, the energy absorption density value increases, and its growth rate accelerates. The peak strain at an impact velocity of 15 m/s is lower than that of low-speed impact (5 m/s and 10 m/s);
- (5)
- Based on the theory and method of continuum mechanics, the evolution process of the damage variables of ultra-early-strength cement-based materials was analyzed from a macro perspective. The damage variable equations at different strain rates were fitted according to the test results and based on the stress–strain curve, and the rationality of the damage evolution process was proved. With the increase in strain rate, the internal crack propagation of the specimen is hindered, and the increase rate of the damage variable decreases. Under the same plastic strain, the damage variable of the specimen under the high strain rate is relatively small.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Times | Compressive Strength (MPa) | Flexural Strength (MPa) |
---|---|---|
2 h | 54.0 | 7.2 |
24 h | 71.0 | 9.7 |
7 d | 80.0 | 9.7 |
28 d | 81.2 | 10.1 |
Speeds | Specimen Number | Measured Size of Test Specimen |
---|---|---|
5 m/s | S_5-1 | Φ101.50 × 48.84 mm |
S_5-2 | Φ100.76 × 49.44 mm | |
S_5-3 | Φ101.08 × 51.44 mm | |
10 m/s | S_10-1 | Φ101.40 × 49.24 mm |
S_10-2 | Φ101.05 × 50.40 mm | |
S_10-3 | Φ101.40 × 50.54 mm | |
15 m/s | S_15-1 | Φ101.32 × 50.12 mm |
S_15-2 | Φ101.38 × 50.32 mm | |
S_15-3 | Φ101.42 × 51.10 mm |
Test No. | Before the Test | After the Test | Recycled |
---|---|---|---|
S_5-1 | | | |
S_5-2 | | | |
S_5-3 | | | |
Test No. | Before the Test | After the Test | Recycled |
---|---|---|---|
S_10-1 | | | |
S_10-2 | | | |
S_10-3 | | | |
Test No. | Before the Test | After the Test | Recycled |
---|---|---|---|
S_15-1 | | | |
S_15-2 | | | |
S_15-3 | | | |
Strain Rates | Dynamic Compressive Strength (Mpa) | ||
---|---|---|---|
7.5 (s−1) | 93.954 | 95.982 | 91.836 |
15.3 (s−1) | 146.194 | 149.262 | 144.668 |
23.5 (s−1) | 173.013 | 175.845 | 170.697 |
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Wang, W.; Zhang, Z.; Huo, Q.; Song, X.; Yang, J.; Wang, X.; Wang, J.; Wang, X. Dynamic Compressive Mechanical Properties of UR50 Ultra-Early-Strength Cement-Based Concrete Material under High Strain Rate on SHPB Test. Materials 2022, 15, 6154. https://doi.org/10.3390/ma15176154
Wang W, Zhang Z, Huo Q, Song X, Yang J, Wang X, Wang J, Wang X. Dynamic Compressive Mechanical Properties of UR50 Ultra-Early-Strength Cement-Based Concrete Material under High Strain Rate on SHPB Test. Materials. 2022; 15(17):6154. https://doi.org/10.3390/ma15176154
Chicago/Turabian StyleWang, Wei, Zhonghao Zhang, Qing Huo, Xiaodong Song, Jianchao Yang, Xiaofeng Wang, Jianhui Wang, and Xing Wang. 2022. "Dynamic Compressive Mechanical Properties of UR50 Ultra-Early-Strength Cement-Based Concrete Material under High Strain Rate on SHPB Test" Materials 15, no. 17: 6154. https://doi.org/10.3390/ma15176154
APA StyleWang, W., Zhang, Z., Huo, Q., Song, X., Yang, J., Wang, X., Wang, J., & Wang, X. (2022). Dynamic Compressive Mechanical Properties of UR50 Ultra-Early-Strength Cement-Based Concrete Material under High Strain Rate on SHPB Test. Materials, 15(17), 6154. https://doi.org/10.3390/ma15176154