Valorization of Fine Recycled Aggregates Contaminated with Gypsum Residues: Characterization and Evaluation of the Risk for Secondary Ettringite Formation
Abstract
:1. Introduction
2. Materials and Methods
2.1. Characterization
2.2. Swelling Tests
- Two mixes that will compare the industrial FRA with either a natural aggregate (named “NS”) and a pure crushed concrete (the reference FRA named “REF”). Both the natural and the recycled aggregate are manually contaminated with 0.5 mass% of gypsum. This 0.5% of gypsum corresponds to to 0.29% of sulfates, which reflects the sulfate contents found in industrial FRA. In the case of FRA, this manual contamination is in addition to the water soluble sulfates already found during the characterization, bringing its total sulfate content to 0.47%.
- One mix made with the reference FRA and a very high gypsum content of 5 mass%— corresponding to 2.9% of sulfates—to exaggerate the consequences of sulfate attack. Again, this manual contamination is in addition to the sulfates already present in this FRA, bringing the total sulfate content to 3.08%.
- To account for their difference in size distribution, all aggregates were recomposed to match the size distribution of the reference FRA. This adaptation caused a slight change in the total sulfate content, water absorption, and density. These new values were recalculated.
- To account for their difference in density, a volumetric equivalent of every aggregate was added to the mortars instead of a mass equivalent, to keep the aggregate envelope volume constant.
- To account for their difference in water absorption, all aggregates were pre-saturated one week before mixing, with their absorbed water and 10% of the mixing water. This assures the same amount of effective water in all mixes, proven to be an important factor in the swelling process [39].
3. Results and Discussion
3.1. Characterization
3.2. Swelling Tests
4. Conclusions
Supplementary Materials
Author Contributions
Funding
Conflicts of Interest
References
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A | B | C | D |
---|---|---|---|
0/4 | 0/10 | 0/32 | 0/20 |
E | F | FRA | NS |
0/90 | 0/10 | ||
Water Absorption | SSD Particle Density | SO42 Content | ||||
---|---|---|---|---|---|---|
(%) | (g/cm3) | (%) | ||||
Source | Original | Recomposed | Original | Recomposed | Original | Recomposed |
A | 6.1 | 7.1 | 2.14 | 2.15 | 0.21 | 0.19 |
B | 8.9 | 9.7 | 2.10 | 2.00 | 0.15 | 0.08 |
C | 11.5 | 10.6 | 1.99 | 1.97 | 0.36 | 0.29 |
D | 10.6 | 8.8 | 2.00 | 1.92 | 0.80 | 0.62 |
E | 14.6 | 12.6 | 1.97 | 1.92 | 0.59 | 0.61 |
F | 13.0 | 11.8 | 1.96 | 1.85 | 0.30 | 0.18 |
REF | 9.8 | 1.95 | 0.18 |
Name | Cement | Water | Aggregate | Extra Gypsum | |
---|---|---|---|---|---|
Effective | Absorbed | (0/4 mm) | |||
A-0.19% | 1350 | 675 | 79.15 | 1116.3 | 0 |
B-0.08% | 1350 | 675 | 100.32 | 1038.5 | 0 |
C-0.29% | 1350 | 675 | 108.22 | 1022.9 | 0 |
D-0.62% | 1350 | 675 | 87.33 | 996.9 | 0 |
E-0.61% | 1350 | 675 | 125.71 | 996.9 | 0 |
F-0.18% | 1350 | 675 | 113.16 | 960.6 | 0 |
REF-0.47% | 1350 | 675 | 98.52 | 1007.4 | 5.1 |
REF-3.08% | 1350 | 675 | 94.07 | 961.9 | 50.6 |
NS-0.29% | 1350 | 675 | 0 | 1343.2 | 6.8 |
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Colman, C.; Bulteel, D.; Rémond, S.; Zhao, Z.; Courard, L. Valorization of Fine Recycled Aggregates Contaminated with Gypsum Residues: Characterization and Evaluation of the Risk for Secondary Ettringite Formation. Materials 2020, 13, 4866. https://doi.org/10.3390/ma13214866
Colman C, Bulteel D, Rémond S, Zhao Z, Courard L. Valorization of Fine Recycled Aggregates Contaminated with Gypsum Residues: Characterization and Evaluation of the Risk for Secondary Ettringite Formation. Materials. 2020; 13(21):4866. https://doi.org/10.3390/ma13214866
Chicago/Turabian StyleColman, Charlotte, David Bulteel, Sébastien Rémond, Zengfeng Zhao, and Luc Courard. 2020. "Valorization of Fine Recycled Aggregates Contaminated with Gypsum Residues: Characterization and Evaluation of the Risk for Secondary Ettringite Formation" Materials 13, no. 21: 4866. https://doi.org/10.3390/ma13214866