Study on Mechanical Properties and Mesoscopic Numerical Simulation of Recycled Concrete
Abstract
:1. Introduction
2. Specimen Preparation
3. Experimental Results
3.1. Quasi-Static Compressive Strength
3.2. Quasi-Static Splitting Tensile Strength
3.3. Dynamic Compressive Strength
4. Numerical Simulation
4.1. CDP Model
4.2. Recycled Concrete Parameters
4.3. Numerical Calculation Results
4.3.1. Meshing Size
4.3.2. Quasi-Static Uniaxial Compression Test
4.3.3. Quasi-Static Uniaxial Splitting Tensile Test
4.3.4. Dynamic Uniaxial Compression Test
5. Conclusions
- (1)
- With the increase in curing age, the uniaxial compressive strength and splitting tensile strength of RC increase continuously. The compressive strength and splitting strength of RC show a decreasing trend with the increase in the RR of RCA. The reason was that the increase in the proportion of RCA increases the number of initial micro-cracks and damages in concrete.
- (2)
- Under impact load, the dynamic compressive strength of RC increases linearly with the increase in strain rate, showing an obvious strain rate enhancement effect. With the increase in the RR of RCA, the strain rate sensitivity of RC decreases gradually, but slightly increases when the RR is 100%.
- (3)
- The CDP model can also describe the mechanical behavior of RC. The numerical simulation results show that the damage and failure of RC first occur at the old ITZ and old mortar under loading. With the increase in strain rate, the damage and failure degree of the specimen were intensified.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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Type | No. | Amount of Concrete Material Per Cubic Meter (kg/m3) | |||||
---|---|---|---|---|---|---|---|
Water Cement Ratio | Water (kg) | Cement (kg) | Sand (kg) | Natural Aggregate (kg) | Recycled Aggregate (kg) | ||
RCA | RCA-0 | 0.5 | 185 | 370 | 637 | 1157 | 0 |
RCA-20 | 0.5 | 185 | 370 | 637 | 926 | 231 | |
RCA-40 | 0.5 | 185 | 370 | 637 | 694 | 463 | |
RCA-60 | 0.5 | 185 | 370 | 637 | 463 | 694 | |
RCA-80 | 0.5 | 185 | 370 | 637 | 231 | 926 | |
RCA-100 | 0.5 | 185 | 370 | 637 | 0 | 1157 |
Material Phase | Elastic Modulus (GPa) | Compressive Strength (MPa) | Tensile Strength (MPa) | Poisson Ratio | Density (g/cm3) |
---|---|---|---|---|---|
New mortar | 26.52 | 38.66 | 3.08 | 0.22 | 2.36 |
Old mortar | 19.27 | 18.17 | 1.66 | 0.22 | 2.38 |
New ITZ | 26.52 | 13.41 | 1.34 | 0.2 | 2.37 |
Old ITZ | 19.27 | 10.21 | 1.02 | 0.2 | 2.36 |
Aggregate | 80 | 80 | 10 | 0.16 | 2.37 |
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Shi, D.; Shi, Q. Study on Mechanical Properties and Mesoscopic Numerical Simulation of Recycled Concrete. Sustainability 2022, 14, 12125. https://doi.org/10.3390/su141912125
Shi D, Shi Q. Study on Mechanical Properties and Mesoscopic Numerical Simulation of Recycled Concrete. Sustainability. 2022; 14(19):12125. https://doi.org/10.3390/su141912125
Chicago/Turabian StyleShi, Dandan, and Qingxuan Shi. 2022. "Study on Mechanical Properties and Mesoscopic Numerical Simulation of Recycled Concrete" Sustainability 14, no. 19: 12125. https://doi.org/10.3390/su141912125