Stress–Strain Curve and Carbonation Resistance of Recycled Aggregate Concrete after Using Different RCA Treatment Techniques
Abstract
:1. Introduction
2. Materials and Experimental Program
2.1. Materials
2.2. Different RCA Treatment Techniques
2.2.1. Flow-Through Carbonation
2.2.2. Pressurized Carbonation
2.2.3. Wet Carbonation
2.2.4. NS Pre-Spraying
2.2.5. Combined Pressurized Carbonation with NS Pre-Spraying
2.3. New Concrete Mix Proportions
2.4. Testing Methods
2.4.1. Measurement of Water Absorption and Particle Density of RCA
2.4.2. Measurement of Density of Hardened Concrete
2.4.3. Measurement of Stress–Strain Curve of Concrete
2.4.4. Measurement of Carbonation Resistance of Concrete
3. Results and Discussion
3.1. Water Absorption and Particle Density of RCA
3.2. Density of Hardened Concrete
3.3. Stress–Strain Curve of Concrete
3.3.1. Peak Stress
3.3.2. Elastic Modulus
3.3.3. Peak Strain
3.3.4. Ultimate Strain
3.3.5. Toughness
3.3.6. Theoretical Model of Stress–Strain Curve
3.4. Carbonation Resistance of Concrete
4. Conclusions
- (1)
- The theoretical model for stress–strain curve of natural aggregate concrete was also suitable to RAC after subjecting to the RCA treatment techniques. For all the studied RCA treatment techniques, the peak stress and elastic modulus of RAC were enhanced, but the peak strain did not show significantly changes while the ultimate strain exhibited some reduction.
- (2)
- The 7-day carbonation depths of RAC after using flow-through carbonation, pressurized carbonation and combined pressurized carbonation with NS pre-spraying were larger than that of RAC using untreated RCA because of the negative effect the carbonated RCA. However, the 28-day carbonation depth of RAC was reduced after using all the studied RCA treatment techniques. In other words, the carbonation resistance of RAC could be enhanced by using these techniques.
- (3)
- Comparing the efficiency of different RCA treatment techniques in enhancement of the peak stress and elastic modulus, the combined pressurized carbonation with NS pre-spraying was the best because both the RA and the new ITZ between RA and the new mortar was enhanced, followed by NS pre-spraying, pressurized carbonation and flow-through carbonation, and the worst was the wet carbonation because only the surface layer of RA was carbonated. The combined pressurized carbonation with NS pre-spraying can significantly improve the performance of RAC, which was better than the other four techniques. Thus, this technique has potential to be used in practical applications.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Acknowledgments
Conflicts of Interest
References
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Aggregate | Size (mm) | Water Absorption (%) | Particle Density (kg/m3) |
---|---|---|---|
RCA5–10 | 5–10 | 6.72% | 2229 |
RCA10–20 | 10–20 | 7.77% | 2196 |
NCA5–10 | 5–10 | 0.69% | 2634 |
NCA10–20 | 10–20 | 0.57% | 2602 |
W/C Ratio | Water | Cement | Sand | Coarse Aggregate (5–10 mm) | Coarse Aggregate (10–20 mm) |
---|---|---|---|---|---|
0.60 | 195 | 325 | 752 | 282 | 846 |
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Li, L.; Xuan, D.; Poon, C.S. Stress–Strain Curve and Carbonation Resistance of Recycled Aggregate Concrete after Using Different RCA Treatment Techniques. Appl. Sci. 2021, 11, 4283. https://doi.org/10.3390/app11094283
Li L, Xuan D, Poon CS. Stress–Strain Curve and Carbonation Resistance of Recycled Aggregate Concrete after Using Different RCA Treatment Techniques. Applied Sciences. 2021; 11(9):4283. https://doi.org/10.3390/app11094283
Chicago/Turabian StyleLi, Long, Dongxing Xuan, and Chi Sun Poon. 2021. "Stress–Strain Curve and Carbonation Resistance of Recycled Aggregate Concrete after Using Different RCA Treatment Techniques" Applied Sciences 11, no. 9: 4283. https://doi.org/10.3390/app11094283
APA StyleLi, L., Xuan, D., & Poon, C. S. (2021). Stress–Strain Curve and Carbonation Resistance of Recycled Aggregate Concrete after Using Different RCA Treatment Techniques. Applied Sciences, 11(9), 4283. https://doi.org/10.3390/app11094283