Evaluation on the Microstructure and Durability of High-Strength Concrete Containing Electric Arc Furnace Oxidizing Slag
Abstract
:1. Introduction
2. Mixture Proportions and Materials
3. Test Methods and Setup
3.1. Hydration Properties
3.2. Compressive Strength Test
3.3. Free Shrinkage Test
3.4. Rapid Freezing and Thawing Resistance Test
4. Results and Discussion
4.1. The XRD Results
4.2. TG/DTG Analysis
4.3. Pore Size Distribution
4.4. Compressive Stregnth Properties
4.5. Autogenous Shrinkage Behavior
4.5.1. The Start Time of Shrinkage
4.5.2. Early Age Behavior of the HSC
4.6. Effect of Freezing and Thawing Cycles
5. Conclusions
- (1)
- HSC with and without slag have a similar hydration process. However, HSC containing less than 15% EAS has lower quantities of C2S and C3S, indicating it has reached a more matured hydration stage compared to HSC with higher EAS content.
- (2)
- HSC containing EAS, when compared to the hydration product of other mixtures, has lower amounts of Ca(OH)2 with relatively poor crystallinity. This is because in the pozzolanic reaction, SiO2 consumes Ca (OH)2, hence Ca (OH)2 decreases with the increasing amount of EAS, so the total contents of C3S and C2S in EAS are less than in other HSCs.
- (3)
- The porosity and pore volume distribution is affected by increasing EAS content; these both increase with increasing replacement ratios of EAS. A similar pattern emerges in the compressive strength test results, especially for the EAS-20 specimen that has the lowest strength among all the tested HSCs. This indicates that specimen EAS-20 contains a considerable amount of RO phase, this has a negative effect on adhesion and might lead to lower strength concrete than that without EAS.
- (4)
- In terms of shrinkage behavior under free conditions, the HSC mixtures’ shrinkage increases with increasing replacement ratios of cementitious materials. The autogenous and drying shrinkage of HSC containing EAS is similar to that of NC-NN when the replacement ratio is less than 15%. This is because replacing the cementitious materials results in increased micro-pore distribution and moisture loss.
- (5)
- From the freezing and thawing resistance tests, the HSC mixtures containing EAS showed a quite gradual decrease in their relative dynamic modulus of elasticity and a gradual increase in their mass-loss rate. The HSC containing 20% EAS significantly deteriorated after the freezing-thawing cycles; whereas HSC containing EAS less than 15% may have sufficient resistance to deterioration from freezing-thawing action. Furthermore, in the comparison of strength before and after freeze-thaw cycling, the loss rate of HSC increases with the increasing replacement ratio of slag, especially for, HSC containing over 15% EAS.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Specimens | w/b (%) | s/a (%) | Unit Weight (kg/m3) | EAS (%) | GBS (%) | AEWE Agent | Slump (mm) | |||
---|---|---|---|---|---|---|---|---|---|---|
Water | Cement | Sand | Coarse Aggregate | |||||||
NC-NN | 32.5 | 40.3 | 170 | 523 | 656 | 971 | - | - | 0.72 | 172 |
EAS-10 | 471 | 10 | - | 0.72 | 180 | |||||
EAS-15 | 445 | 15 | - | 0.65 | 170 | |||||
EAS-20 | 418 | 20 | - | 0.65 | 170 | |||||
GBS-15 | 445 | - | 15 | 0.68 | 180 | |||||
GBS-30 | 366 | - | 30 | 0.65 | 175 |
Type | Surface Area (cm2/g) | Density (g/cm3) | Chemical Composition (%) | |||||||
---|---|---|---|---|---|---|---|---|---|---|
SiO2 | CaO | Al2O3 | T-Fe* | MgO | SO3 | MnO | P2O5 | |||
Cement | 3400 | 3.15 | 22.0 | 64.2 | 5.5 | 3.0 | 1.5 | 2.0 | - | 0.89 |
EAS | 4893 | 3.96 | 14.2 | 24.1 | 11.1 | 39.92 | 3.33 | 0.019 | 5.59 | 0.537 |
GBS | 3258 | 2.90 | 29.1 | 49.4 | 12.7 | 0.38 | 5.67 | 0.532 | 0.29 | 0.015 |
Title | Flexure Strength (MPa) | Compressive Strength (Mpa) | ||||
---|---|---|---|---|---|---|
Before | After | Loss Rate | Before | After | Loss Rate | |
NC-NN | 11.7 | 3.7 | 68.2% | 66.7 | 53.6 | 19.7% |
EAS-10 | 8.5 | 2.1 | 75.0% | 58.9 | 44.3 | 24.9% |
EAS-15 | 8.7 | 1.6 | 81.5% | 56.7 | 39.9 | 29.7% |
EAS-20 | 7.7 | 0.8 | 89.7% | 48.3 | 19.6 | 59.4% |
GBS-15 | 10.1 | 3.2 | 68.4% | 58.4 | 48.6 | 16.8% |
GBS-30 | 9.3 | 3.1 | 67.2% | 58.7 | 47.9 | 18.4% |
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Yuan, T.-F.; Hong, S.-H.; Choi, J.-S.; Yoon, Y.-S. Evaluation on the Microstructure and Durability of High-Strength Concrete Containing Electric Arc Furnace Oxidizing Slag. Materials 2021, 14, 1304. https://doi.org/10.3390/ma14051304
Yuan T-F, Hong S-H, Choi J-S, Yoon Y-S. Evaluation on the Microstructure and Durability of High-Strength Concrete Containing Electric Arc Furnace Oxidizing Slag. Materials. 2021; 14(5):1304. https://doi.org/10.3390/ma14051304
Chicago/Turabian StyleYuan, Tian-Feng, Se-Hee Hong, Jin-Seok Choi, and Young-Soo Yoon. 2021. "Evaluation on the Microstructure and Durability of High-Strength Concrete Containing Electric Arc Furnace Oxidizing Slag" Materials 14, no. 5: 1304. https://doi.org/10.3390/ma14051304