Evaluation of Ultra-High-Performance Concrete Columns at High Temperatures after 180 Days of Curing
Abstract
:1. Introduction
2. Materials and Methods
3. Results
3.1. Losses of the Compressive Strength and Modulus of Elasticity Due to Exposure to High Temperatures
3.2. Behaviors of Columns Exposed to Elevated Temperatures
4. Conclusions
- Comparing the results obtained with those reported in the bibliography, it should be mentioned that the high strength of the UHPC may lead to a higher displacement and spalling than in conventional concretes, even considering the lower water/cement ratios.
- UHPC exposed to elevated temperatures suffered from external degradation, which gradually changed the cross-section of the columns due to spalling.
- Up to a temperature of 400 °C, the compressive strength increased by up to 30.5% concerning the reference value. On the other hand, the modulus of elasticity and density decreased for the reference values, with peak reductions of 30% and 6%, respectively.
- The test results pointed out that the quartz sand aggregate in the mixture was deleterious to concrete performance and induced spalling as temperatures reached approximately 600 °C.
- The loss of the concrete session did not occur immediately, and there was a progressive detachment of the concrete due to heating. Once a heated piece of concrete was loosened, a new surface was exposed and again, it was heated to the point of spalling. This phenomenon caused small cracks that were possible to hear during the tests.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Materials | kg/m³ |
---|---|
Portland cement | 490 |
Silica fume | 269 |
Fly ash | 235 |
Quartz sand | 1025.5 |
Water | 179 |
Superplasticizer additive | 17.6 |
Steel fibers | 120 |
PVA fibers | 6 |
COLUMN 1 | COLUMN 2 | |||
---|---|---|---|---|
Section | Ave (mm) | Spalling | Ave (mm) | Spalling |
1 | 66.8 | 27% | 57.2 | 23% |
2 | 179.6 | 72% | 61.6 | 25% |
3 | 184.0 | 74% | 104.0 | 42% |
4 | 134.6 | 54% | 122.0 | 49% |
5 | 130.0 | 52% | 46.8 | 19% |
6 | 122.8 | 49% | 135.4 | 54% |
7 | 158.2 | 63% | 154.2 | 62% |
8 | 91.2 | 36% | 165.0 | 66% |
9 | 62.2 | 25% | 134.2 | 54% |
10 | 126.2 | 50% | 120.4 | 48% |
11 | 129.0 | 52% | 114.6 | 46% |
12 | 81.6 | 33% | 93.0 | 37% |
Average spalling | 49% | Average spalling | 44% |
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Christ, R.; Lerner, L.R.; Ehrenbring, H.Z.; Pacheco, F.; Bolina, F.L.; Poleto, G.; Gil, A.M.; Tutikian, B.F. Evaluation of Ultra-High-Performance Concrete Columns at High Temperatures after 180 Days of Curing. Buildings 2023, 13, 2254. https://doi.org/10.3390/buildings13092254
Christ R, Lerner LR, Ehrenbring HZ, Pacheco F, Bolina FL, Poleto G, Gil AM, Tutikian BF. Evaluation of Ultra-High-Performance Concrete Columns at High Temperatures after 180 Days of Curing. Buildings. 2023; 13(9):2254. https://doi.org/10.3390/buildings13092254
Chicago/Turabian StyleChrist, Roberto, Lucas Rafael Lerner, Hinoel Z. Ehrenbring, Fernanda Pacheco, Fabricio L. Bolina, Giovana Poleto, Augusto Masiero Gil, and Bernardo F. Tutikian. 2023. "Evaluation of Ultra-High-Performance Concrete Columns at High Temperatures after 180 Days of Curing" Buildings 13, no. 9: 2254. https://doi.org/10.3390/buildings13092254