Pre-Saturation Technique of the Recycled Aggregates: Solution to the Water Absorption Drawback in the Recycled Concrete Manufacture †
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
Standard | Test and result | Limit value [4] |
---|---|---|
UNE-EN 933-1:2012 [32] | Particle size analysis D/d ratio: 4 | ≥1.4 |
UNE-EN 933-2:1996+1M:1999 [33] | Fines content: 0.04% | ≤1.5% |
UNE-EN 1097-6:2001+A1:2006 [34] | Apparent density (ρa): 2.53 Mg/m3 | - |
After oven-drying density (ρrd): 2.08 Mg/m3 | - | |
Saturate surface density (ρssd): 2.26 Mg/m3 | - | |
Water absorption: 8.53% | ≤7% | |
UNE-EN 1097-2:2010 [35] | Los Angeles coefficient: 40.99% | ≤40% |
UNE-EN 933-3:2012 [36] | Flakiness index: 14.75% | ≤35% |
2.2. Concrete Mixtures
Mixes | Percentage of NA | Percentage of RA |
---|---|---|
Mix 0 | 100% | 0% |
Mix 1 | 80% | 20% |
Mix 2 | 50% | 50% |
Mix 3 | 0% | 100% |
Components (kg/m3) | Percentage of RA | |||
---|---|---|---|---|
0% | 20% | 50% | 100% | |
Water | 215 | 215 | 215 | 215 |
Water/cement ratio | 0.55 | 0.55 | 0.55 | 0.55 |
Cement | 390.9 | 390.9 | 390.9 | 390.9 |
Sand | 667.1 | 669.2 | 744.1 | 811.0 |
Gravel | 1060.9 | 790.0 | 442.6 | 0.0 |
Recycled aggregate | 0.0 | 197.5 | 442.6 | 732.3 |
- Air Drying(S).
- Immersedin waterfor a certain “X” period(P-X) (Figure 2).
2.3. Pre-Saturation Period
2.4. Consistency
2.5. Compressive Strength
3. Results and Discussion
3.1. Pre-Saturation Period
Time (min) | Absorption (%) |
---|---|
0 | 0.0 |
3 | 47.5 |
5 | 50.2 |
60 | 56.1 |
3.2. Slump Test
3.3. Compressive Strength Test
4. Conclusions
Acknowledgments
Author Contributions
Conflicts of Interest
References
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García-González, J.; Rodríguez-Robles, D.; Juan-Valdés, A.; Morán-del Pozo, J.M.; Guerra-Romero, M.I. Pre-Saturation Technique of the Recycled Aggregates: Solution to the Water Absorption Drawback in the Recycled Concrete Manufacture. Materials 2014, 7, 6224-6236. https://doi.org/10.3390/ma7096224
García-González J, Rodríguez-Robles D, Juan-Valdés A, Morán-del Pozo JM, Guerra-Romero MI. Pre-Saturation Technique of the Recycled Aggregates: Solution to the Water Absorption Drawback in the Recycled Concrete Manufacture. Materials. 2014; 7(9):6224-6236. https://doi.org/10.3390/ma7096224
Chicago/Turabian StyleGarcía-González, Julia, Desirée Rodríguez-Robles, Andrés Juan-Valdés, Julia Mª Morán-del Pozo, and M. Ignacio Guerra-Romero. 2014. "Pre-Saturation Technique of the Recycled Aggregates: Solution to the Water Absorption Drawback in the Recycled Concrete Manufacture" Materials 7, no. 9: 6224-6236. https://doi.org/10.3390/ma7096224