Properties and Mechanical Strength Analysis of Concrete Using Fly Ash, Ground Granulated Blast Furnace Slag and Various Superplasticizers
Abstract
:1. Introduction
2. Methods
2.1. High Volume Fly Ash and Ground Granulated Blast-Furnace Slag Concrete Material Preparation
2.1.1. Cementitious Materials
2.1.2. Natural Aggregate
2.2. Mixing Proportionss and Specimen Preparation
2.3. Methods
3. Results and Discussion
3.1. HVFGC Workability
3.2. HVFGC Mechanical Behavior to Compressive Strength
3.3. HVFGC Mechanical Behavior to Flexural Strength
3.4. Nondestructive Experiments and Mechanical Behavior
3.5. Comprehensive Assessment of the Microscopic Analyses
4. Conclusions
- As a result of setting time, the I/F value W/B = 0.21, the ratio of PCE to MLS is the same as 4.4~5, and the ratio of W/B = 0.27 and 0.35 is the same as the ratio of PCE to SNF, which is 3.3~3.6.
- The optimal ratio was achieved by using PCE, a W/B ratio of 0.21, and FA and GGBFS replacement ratios of 20% and 20%, respectively.
- For the compressive strength of SP types, PCE and SNF can affect the strength development of concrete in 1–7 days, and the strength development after 7 days is more obvious to MLS.
- In the ultrasonic velocity and compressive strength prediction model, the correlation coefficient R value is >0.9, which is highly reliable, among which the R value of MLS is 0.97 is the best, and its mean squared error is 2.21.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Chemical Composition (%) | Cement | FA | GGBFS | |
---|---|---|---|---|
SiO2 | 21.23 | 67.9 | 34.4 | |
Al2O3 | 5.57 | 21.5 | 14.8 | |
Fe2O3 | 3.57 | 3.63 | 0.41 | |
CaO | 62.15 | 2.1 | 41.7 | |
MgO | 2.51 | 1.2 | 6.6 | |
SO3 | 1.99 | 0.26 | 0.12 | |
Na2O | 0.1 | 0.68 | 0.28 | |
K2O | 0.54 | 0.84 | 0.37 | |
Physical property | Fineness (m2/kg) | 321 | 381.8 | 400 |
Specific gravity | 3.15 | 2.16 | 2.90 | |
Alkali content (%) | - | 1.23 | 0.52 | |
LOI | 2.65 | 2.8 | - |
Variable | Value |
---|---|
W/B | 0.21, 0.27, 0.35 |
FA (%) | 20, 30 |
GGBFS (%) | 20, 30 |
Code | For example: 21F20S30, then W/B = 0.21, FA substitution amount is 20%, GGBFS substitution amount is 30%. |
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Juang, C.-U.; Kuo, W.-T. Properties and Mechanical Strength Analysis of Concrete Using Fly Ash, Ground Granulated Blast Furnace Slag and Various Superplasticizers. Buildings 2023, 13, 1644. https://doi.org/10.3390/buildings13071644
Juang C-U, Kuo W-T. Properties and Mechanical Strength Analysis of Concrete Using Fly Ash, Ground Granulated Blast Furnace Slag and Various Superplasticizers. Buildings. 2023; 13(7):1644. https://doi.org/10.3390/buildings13071644
Chicago/Turabian StyleJuang, Chuen-Ul, and Wen-Ten Kuo. 2023. "Properties and Mechanical Strength Analysis of Concrete Using Fly Ash, Ground Granulated Blast Furnace Slag and Various Superplasticizers" Buildings 13, no. 7: 1644. https://doi.org/10.3390/buildings13071644