Uniaxial Compressive Stress–Strain Relation of Recycled Coarse Aggregate Concrete with Different Carbonation Depths
Abstract
:Highlights
- Uniaxial compressive stress–strain curves of recycled aggregate concrete (RAC) with different carbonation depth were investigated.
- The effect of carbonation depth on peak stress, strain, elastic modulus, and the relative toughness of RAC was studied.
- Stress–strain models of recycled aggregate concrete with different carbonation depths were established.
Abstract
1. Introduction
2. Experimental Method
2.1. Materials and Mixture Proportions
2.2. Accelerated Carbonation Procedure
2.3. Uniaxial Compressive Loading Test
3. Experimental Results and Discussion
3.1. Carbonation Depth
3.2. Failure Pattern
3.3. Uniaxial Compressive Stress–Strain Curves
3.3.1. Peak Stress
3.3.2. Strain
3.3.3. Elastic Modulus
3.3.4. Relative Toughness
4. Stress–Strain Relation of Carbonated RAC and NAC
5. Summary
- (1)
- During the accelerated carbonation, the values of the carbonation depth of RAC increases as the replacement ratio of recycled coarse aggregate increases. At 84 days, RAC100 was fully carbonated and the carbonation depth was 35.0 mm, whereas that of RAC50 and NAC were 31.0 and 19.2 mm, respectively.
- (2)
- The peak stress and elastic modulus of RAC and NAC specimens increased with the increase of carbonation depth, and the peak stress of fully carbonated RAC100 increased by about 62.8% and elastic modulus has increased by about 28.3%. The ratio of ultimate strain to peak strain and relative toughness of RAC and NAC specimens decreased overall with the increase of carbonation depth. When the carbonation depth reached about 20 mm, the relative toughness of RAC50 and RAC100 specimens decreased by about 7.1% and 16.2%, respectively, compared with non-carbonated specimens.
- (3)
- Stress–strain models of recycled aggregate concrete with different carbonation depths were established, and the experimental values are in good agreement with the theoretical values and correlation coefficients are over 0.9. Carbonation decreased the relative slope of the ascending part and increased the relative steepness of the descending part of stress–strain curves of recycled aggregate concrete.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Property | Value |
---|---|
Type and class | P.O 42.5 |
Specific surface area (m2 kg−1) | 335 |
Initial and final setting times (min) | 215/265 |
28-day compressive and flexural strength (MPa) | 49.8/8.7 |
SO3 (%) | 2.4 |
MgO (%) | 1.8 |
CaO (%) | 62.6 |
SiO2 (%) | 21.2 |
Al2O3 (%) | 5.6 |
Fe2O3 (%) | 4.6 |
Aggregate Type | Coarse Aggregate Grading (mm) | Apparent Density (kg/m3) | Water Absorption (%) | Crushing Value (%) |
---|---|---|---|---|
NCA | 5–20 | 2773 | 1.08 | 3.2 |
RCA | 5–20 | 2541 | 5.12 | 14.2 |
Concrete Type | Water (kg/m3) | Cement (kg/m3) | Water to Cement Ratio | NCA (kg/m3) | RCA (kg/m3) | Fine Aggregates (kg/m3) |
---|---|---|---|---|---|---|
NAC | 195 | 274.6 | 0.71 | 1131.1 | 0.0 | 754.1 |
RAC50 | 200 | 333.3 | 0.60 | 566.8 | 519.0 | 694.2 |
RAC100 | 205 | 410.0 | 0.50 | 0.0 | 1006.6 | 643.5 |
Specimens | Coefficient a | Correlation Coefficient | Coefficient b | Correlation Coefficient |
---|---|---|---|---|
NAC-0.0 mm | 1.057 | 0.998 | 3.568 | 0.993 |
NAC-4.9 mm | 0.871 | 0.999 | 1.835 | 0.960 |
NAC-9.0 mm | 0.624 | 0.999 | 3.010 | 0.950 |
NAC-12.2 mm | 0.653 | 0.999 | 3.432 | 0.947 |
NAC-14.5 mm | 0.674 | 0.999 | 3.466 | 0.944 |
NAC-17.5 mm | 0.473 | 0.999 | 3.648 | 0.999 |
NAC-19.8 mm | 0.214 | 0.997 | 4.706 | 0.988 |
RAC50-0 mm | 1.099 | 0.990 | 2.170 | 0.943 |
RAC50-9.3mm | 1.213 | 0.997 | 2.284 | 0.943 |
RAC50-15.3 mm | 0.540 | 0.998 | 2.813 | 0.950 |
RAC50-19.4 mm | 0.766 | 0.996 | 3.065 | 0.931 |
RAC50-21.3 mm | 0.926 | 0.996 | 2.554 | 0.911 |
RAC50-29.1mm | 0.571 | 0.997 | 3.434 | 0.930 |
RAC50-31.0 mm | 0.613 | 0.999 | 3.505 | 0.959 |
RAC100-0 mm | 1.841 | 0.986 | 1.962 | 0.921 |
RAC100-11.4 mm | 1.482 | 0.985 | 2.220 | 0.926 |
RAC100-16.8 mm | 1.551 | 0.988 | 2.445 | 0.945 |
RAC100-21.5 mm | 0.636 | 0.986 | 3.104 | 0.972 |
RAC100-25.2 mm | 0.636 | 0.999 | 3.032 | 0.957 |
RAC100-28.9 mm | 0.558 | 0.995 | 3.193 | 0.944 |
RAC100-35.0 mm | 0.705 | 0.999 | 2.005 | 0.999 |
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Tu, K.; Wu, J.; Wang, Y.; Deng, H.; Zhang, R. Uniaxial Compressive Stress–Strain Relation of Recycled Coarse Aggregate Concrete with Different Carbonation Depths. Materials 2022, 15, 5429. https://doi.org/10.3390/ma15155429
Tu K, Wu J, Wang Y, Deng H, Zhang R. Uniaxial Compressive Stress–Strain Relation of Recycled Coarse Aggregate Concrete with Different Carbonation Depths. Materials. 2022; 15(15):5429. https://doi.org/10.3390/ma15155429
Chicago/Turabian StyleTu, Kun, Jin Wu, Yiyuan Wang, Huachao Deng, and Rui Zhang. 2022. "Uniaxial Compressive Stress–Strain Relation of Recycled Coarse Aggregate Concrete with Different Carbonation Depths" Materials 15, no. 15: 5429. https://doi.org/10.3390/ma15155429