Experimental and Numerical Studies on the Direct Shear Behavior of Sand–RCA (Recycled Concrete Aggregates) Mixtures with Different Contents of RCA
Abstract
:1. Introduction
2. Laboratory Tests
2.1. Materials
2.2. Test Plan
3. DEM Simulation of Direct Shear Test
3.1. Modeling Authentic RCA
3.2. Numerical Direct Shear Model
3.3. Contact Model and Micro-Parameters
4. Results Analyses
4.1. Macroscopic Behavior
4.2. Microscopic Behavior
4.2.1. Coordination Number
4.2.2. Contact Forces in the Peak State
4.2.3. Contact Force Anisotropy
5. Conclusions
- The RCA content plays an important role in the mechanical performance of RCA–sand mixtures. Both the laboratory test and numerical simulation results show that the shear strength increases after adding RCA to sand, and, with the increase of the RCA content, the shear strength of the RCA–sand mixtures increases.
- The coordination number of all contacts increases with the RCA content. For specific contacts, the decreases and the increases with RCA content, while the has an increasing trend with the RCA content increasing from 20% to 60%, and then it decreases as the RCA content increases to 80%.
- The distribution of contact force can be significantly affected by the RCA content. An increase in the RCA content leads to an increase in the average contact force. Analyses of the PDFs of contact forces show that RCA tends to have a more significant effect on the occurrence of large contact forces.
- The RCA content can significantly affect the anisotropies of normal contact forces. The rotation of the normal contact force anisotropy decreases with the RCA content. Meanwhile, the anisotropies of the shear contact forces seem to be much less affected by the RCA content, while the rotation of the shear contact force anisotropy was found to be independent of the RCA content.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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RCA Content | 0% | 20% | 40% | 60% | 80% |
---|---|---|---|---|---|
Density (kg/m3) | 1720 | 1742 | 1764 | 1786 | 1808 |
Parameters | RCA | Sand | Wall |
---|---|---|---|
Density, ρ (kg/m3) | 2500 | 2700 | - |
Normal stiffness, kn (N/m) | 5 × 105 | 5 × 105 | 5 × 106 |
Tangential stiffness, ks (N/m) | 5 × 105 | 5 × 105 | 5 × 106 |
Internal friction coefficient, μ | 0.7 | 0.5 | - |
Rolling friction coefficient, μr | - | 1.0 | - |
Local damping | 0.7 | 0.7 | - |
0% | 33,210.01 | 0.68 | 89.75 | 41,752.45 | 0.87 | 52.79 | 38,021.11 | 0.81 | 61.58 |
20% | 31,801.40 | 0.65 | 89.87 | 40,257.75 | 0.84 | 51.91 | 36,889.23 | 0.78 | 58.64 |
40% | 30,605.90 | 0.64 | 89.63 | 39,432.10 | 0.82 | 48.12 | 35,397.66 | 0.76 | 57.03 |
60% | 28,967.13 | 0.64 | 90.04 | 37,088.46 | 0.82 | 47.48 | 33,504.11 | 0.76 | 56.17 |
80% | 26,722.61 | 0.62 | 89.33 | 36,247.77 | 0.87 | 45.25 | 32,291.18 | 0.77 | 55.69 |
0% | 172.15 | 0.39 | 129.14 | 4867.23 | 0.92 | 115.15 | 3012.45 | 0.83 | 118.42 |
20% | 164.06 | 0.38 | 130.41 | 4811.37 | 0.94 | 116.48 | 2890.46 | 0.82 | 118.03 |
40% | 134.97 | 0.46 | 126.18 | 4878.95 | 0.95 | 117.59 | 2714.54 | 0.85 | 118.91 |
60% | 149.17 | 0.41 | 127.07 | 4857.70 | 0.96 | 118.18 | 2793.37 | 0.83 | 119.15 |
80% | 152.78 | 0.49 | 130.08 | 5241.15 | 0.98 | 118.86 | 2675.40 | 0.84 | 117.21 |
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Liu, Y.; Huang, S.; Li, L.; Xiao, H.; Chen, Z.; Mao, H. Experimental and Numerical Studies on the Direct Shear Behavior of Sand–RCA (Recycled Concrete Aggregates) Mixtures with Different Contents of RCA. Materials 2021, 14, 2909. https://doi.org/10.3390/ma14112909
Liu Y, Huang S, Li L, Xiao H, Chen Z, Mao H. Experimental and Numerical Studies on the Direct Shear Behavior of Sand–RCA (Recycled Concrete Aggregates) Mixtures with Different Contents of RCA. Materials. 2021; 14(11):2909. https://doi.org/10.3390/ma14112909
Chicago/Turabian StyleLiu, Yiming, Shiqiang Huang, Lihua Li, Henglin Xiao, Zhi Chen, and Haijun Mao. 2021. "Experimental and Numerical Studies on the Direct Shear Behavior of Sand–RCA (Recycled Concrete Aggregates) Mixtures with Different Contents of RCA" Materials 14, no. 11: 2909. https://doi.org/10.3390/ma14112909