Strength and Durability Characteristics of Cement Composites with Recycled Water and Blast Furnace Slag Aggregate
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Mixing Proportions and Specimen Preparation
3. Results and Discussion
3.1. Mortar Flow
3.2. Compressive Strength
3.3. Split-Tensile Strength
3.4. Drying Shrinkage
3.5. Accelerated Carbonation Depth
3.6. Chloride-Ion Penetrability
4. Conclusions
- (1)
- In this study, using RW did not significantly affect the mortar flow, but the mortar flow increased with the replacement ratio of BSFA, which seems to be due to the vitreous properties of blast furnace slag aggregates;
- (2)
- The 28-day compressive strengths of the control sample and RW5BS0 sample were similar, and the compressive strengths of all the samples using RW and BSFA were higher than that of the control sample. Further, the split-tensile strengths of the samples increased with the BSFA replacement ratio, similar to the tendency of the compressive strength;
- (3)
- It was found that when the replacement ratio of BSFA was lower than 20%, the drying shrinkage of the cement mortar using RW was effectively reduced. In the case of the samples using RW, as the BSFA replacement ratio was increased, the carbonation depth of the samples decreased, and the accelerated carbonation depth of the RW5BS40 sample using RW and 40% of BSFA was the lowest at approximately 0.56 mm;
- (4)
- In the case of the mixtures using RW and BSFA, the charge passed through the sample tended to decrease gradually as the BSFA replacement ratio was increased;
- (5)
- Therefore, when RW and BSFA are used properly, it is expected that the mechanical properties of cement mortar, carbonation resistance, and chloride ion penetration resistance can be enhanced.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Mix | W/C (%) | Water (g) | Cement (g) | Sand Fines (g) |
---|---|---|---|---|
Sludge | 50 | 200 | 400 | 100 |
Type | SiO2 | Al2O3 | Fe2O3 | CaO | MgO | K2O |
---|---|---|---|---|---|---|
OPC | 17.43 | 6.50 | 3.57 | 64.40 | 2.55 | 1.17 |
Type | Fineness Modulus (FM) | Density | Water Absorption Ratio (%) |
---|---|---|---|
Natural fine aggregate (NFA) | 2.45 | 2.60 | 1.0 |
Blast furnace slag fine aggregate (BSFA) | 2.30 | 2.80 | 2.1 |
BSFA (%) | Sludge Content (%) | W/C (%) | Water (kg/m3) | Cement (kg/m3) | NFA (kg/m3) | BSFA (kg/m3) | |
---|---|---|---|---|---|---|---|
Control | 0 | 0 | 50 170 340 | 739 | 0 | ||
RW5BS0 | 0 | 5 | 739 | 0 | |||
RW5BS10 | 10 | 5 | 665 | 80 | |||
RW5BS20 | 20 | 5 | 591 | 160 | |||
RW5BS30 | 30 | 5 | 518 | 240 | |||
RW5BS40 | 40 | 5 | 444 | 320 |
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Choi, S.-J.; Bae, S.-H.; Lee, J.-I.; Kim, J.-H. Strength and Durability Characteristics of Cement Composites with Recycled Water and Blast Furnace Slag Aggregate. Materials 2021, 14, 2156. https://doi.org/10.3390/ma14092156
Choi S-J, Bae S-H, Lee J-I, Kim J-H. Strength and Durability Characteristics of Cement Composites with Recycled Water and Blast Furnace Slag Aggregate. Materials. 2021; 14(9):2156. https://doi.org/10.3390/ma14092156
Chicago/Turabian StyleChoi, Se-Jin, Sung-Ho Bae, Jae-In Lee, and Ji-Hwan Kim. 2021. "Strength and Durability Characteristics of Cement Composites with Recycled Water and Blast Furnace Slag Aggregate" Materials 14, no. 9: 2156. https://doi.org/10.3390/ma14092156