Alkali-Activated Stainless Steel Slag as a Cementitious Material in the Manufacture of Self-Compacting Concrete
Abstract
:1. Introduction
2. Experimental Programme
2.1. Materials
2.2. Mix Proportions and Manufacture of Geopolymer Pastes SSS-FA and Alkali-Activated Self-Compacting Concrete
- Manufacture of binder using SSS-FA dissolution in NaOH
- Aggregate-cement mixture
- Adding binder to the mix
- Addition of remaining water + additive
- Consistency measurement by flow extension test
- Filling of specimens
- Curing in an oven at 80 °C for 22 h
- De-moulding and conservation in the curing chamber.
3. Test Methods and Results
3.1. Flowability
3.2. SSS-FA Binder—Compressive and Flexural Strength
3.3. SCC—Compressive Strength
3.4. SCC—Splitting Tensile Strength
3.5. Water Absorption, Density, and Accessible Porosity
3.6. Macroporosity through Digital Image Analysis
3.7. Carbonation Depth
4. Conclusions
- i.
- SS presents a chemical composition suitable for the potential alkali activation. SSS are mainly composed of SiO2, CaO, and MgO. The application of crushing and burning treatments results in an increase in these three elements.
- ii.
- Initial mechanical performance tests on pastes manufactured with SSS-FA and NaOH as an alkaline activator showed a reduction in strength as the percentage of SSS increased. It is important to point out that the mechanical behaviour improved with the appropriate curing conditions and the application of different treatments to the SSS.
- iii.
- The manufacture of SCC with the substitution of 50% cement by a binder manufactured with SSS and FA led to a loss of compressive strength of approximately 10–14%. The treatment of SSS improved the results of indirect traction and compression tests. All the series manufactured with SSS resulted in a compressive strength greater than 30 MPa at 28 days curing.
- iv.
- In terms of durability, SCC manufactured with alkali-activated SSS significantly reduced absorption and porosity parameters compared to a control SCC. Evaluation of macroporosity by image analysis showed a reduction in pore volume in alkali-activated SCC specimens with SSS compared to conventional SCC specimens. It also showed a lower pore connection.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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FA | SSS-NP | SSS-C | SSS-B | SSS-CB | Test method | ||
---|---|---|---|---|---|---|---|
Physical properties | |||||||
Density-SSD (kg/dm3) | 1.28 | 2.06 | 1.8 | 1.69 | 1.66 | UNE-EN 1097-6:2014 [32] | |
Water absorption (%) | 4.35 | 6.12 | 5.31 | 5.44 | 5.41 | ||
Chemical properties | |||||||
Elemental components (%) | SiO2 | 49.10 | 28.3 | 29.88 | 29.04 | 29.81 | UNE-EN 196-2:2014 [33] |
Al2O3 | 28.33 | 5.64 | 5.73 | 5.64 | 5.83 | ||
Fe2O3 | 5.20 | 3.09 | 1.31 | 2.3 | 1.46 | ||
CaO | 7.81 | 42.09 | 44.51 | 43.11 | 44.65 | ||
MgO | 2.12 | 10.97 | 11.68 | 11.22 | 11.85 | ||
SO3 | 0.33 | 0.39 | 0.34 | 0.33 | 0.35 | ||
K2O | 0.91 | 0 | 0 | 0 | 0 |
SSS | FA | Nomenclature | |||
---|---|---|---|---|---|
SSS-NP | SSS-C | SSS-B | SSS-CB | ||
35 | - | - | - | 65 | SSS-NP 35/65 |
- | 35 | - | - | 65 | SSS-C 35/65 |
- | - | 35 | - | 65 | SSS-B 35/65 |
- | - | - | 35 | 65 | SSS-CB 35/65 |
70 | - | - | - | 30 | SSS-NP 70/30 |
- | 70 | - | - | 30 | SSS-C 70/30 |
- | - | 70 | - | 30 | SSS-B 70/30 |
- | - | - | 70 | 30 | SSS-CB 70/30 |
CONTENT (kg/m3) | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
Natural Sand (0–40 mm) | Natural Aggregates (40–200 mm) | OPC | Filler | Admixture | Water | Binder 35SSS-FA | ||||
SSS-NP | SSS-C | SSS-B | ||||||||
SCC-30 | Control | 1000 | 700 | 325 | 125 | 3.41 | 195 | - | - | - |
35SSS-NP | 1000 | 700 | 227.5 | - | 1.65 | 144 | 227.5 | - | - | |
35SSS-C | 1000 | 700 | 225 | - | 1.62 | 140 | - | - | 225 | |
35SSS-B | 1000 | 700 | 225 | - | 1.62 | 140 | - | 225 | - |
Test Method | Curing Time | ||
---|---|---|---|
Technological tests | Properties of fresh SCC | ||
Flowability | UNE-EN 12350-8:2011 [46] UNE-EN 12350-10:2011 [47] UNE 12350-12:2011 [48] | 0 days | |
Properties of hardened SSS-FA binder | |||
Compressive strength | UNE 196-1:2018 [49] | 7, 28 days | |
Flexural strength | UNE 196-1:2018 [49] | 7, 28 days | |
Properties of hardened SCC | |||
Compressive strength | UNE 12390-3:2009 [50] | 1, 7, 28 days | |
Tensile splitting strength | UNE-EN 12390-6:2010 [51] | 28 days | |
Durability properties | Water absorption, density, and accessible porosity | UNE 83980:2014 [52] | 28 days |
Macroporosity through digital image analysis | 28 days | ||
Depth carbonation | UNE 112011:2011 [53] | 28, 56, 90 days |
Slump Test | L-Box Test | J-Ring | ||||
---|---|---|---|---|---|---|
D (mm) | T200 (s) | T400 (s) | H2/H1 (%) | DH = H1 − H2 (mm) | ||
Compliance requirements | 650–750 | <1.5 | <2.5 | 0.8–1 | <10 | |
(recommended) | ||||||
Control | 712 | 1.23 | 1.97 | 0.88 | 5.1 | |
35SSS-NP | 715 | 1.36 | 2.12 | 0.93 | 3.9 | |
35SSS-C | 721 | 1.41 | 2.05 | 0.91 | 4.3 | |
35SSS-B | 719 | 1.48 | 2.23 | 0.91 | 4.5 |
CURING CONDITION 40 °C (22 Initial Hours) | CURING CONDITION 80 °C (22 Initial Hours) | |||||||
---|---|---|---|---|---|---|---|---|
Flexural Strength (MPa) | Compressive Strength (MPa) | Flexural Strength (MPa) | Compressive Strength (MPa) | |||||
7D | 28D | 7D | 28D | 7D | 28D | 7D | 28D | |
100FA-CONTROL | 1.51 | 5.01 | 3.33 | 11.91 | 10.86 | 4.36 | 32.79 | 44.67 |
35SSS-NP | 0.31 | 2.15 | 2.31 | 4.42 | 4.35 | 6.44 | 13.50 | 20.04 |
70SSS-NP | 1.3 | 1.33 | 0.64 | 1.03 | 3.68 | 4.35 | 7.42 | 17.49 |
35SSS-C | 0.92 | 2.34 | 0.34 | 3.01 | 0.96 | 3.63 | 6.48 | 23.32 |
70SSS-C | 0.66 | 1.32 | 1.41 | 1.72 | 1.20 | 2.80 | 5.96 | 19.55 |
35SSS-B | 0.93 | 1.98 | 1.56 | 1.79 | 2.48 | 4.39 | 19.59 | 29.26 |
70SSS-B | 1.23 | 1.57 | 0.83 | 1.06 | 0.46 | 2.35 | 5.54 | 11.28 |
35SSS-CB | 0.37 | 0.73 | 0.61 | 2.52 | 2.15 | 5.01 | 12.15 | 18.75 |
70SSS-CB | 0.187 | 1.85 | 1.06 | 3.43 | 1.06 | 3.75 | 9.63 | 15.25 |
Compressive Strength (MPa) | ||
---|---|---|
7D | 28D | |
Control | 25.86 | 42.21 |
35SSS-NP | 17.44 | 34.11 |
35SSS-C | 21.2 | 35.06 |
35SSS-B | 22.77 | 35.29 |
Control | 35SSS-NP | 35SSS-C | 35SSS-B | |
---|---|---|---|---|
Bulk density (kg/dm3) | 2.28 | 2.36 | 2.31 | 2.3 |
Absorption coefficient (%wt.) | 9.11 | 6.29 | 4.48 | 5.79 |
Open porosity (%vol.) | 20.78 | 14.86 | 10.39 | 13.33 |
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Rosales, J.; Agrela, F.; Díaz-López, J.L.; Cabrera, M. Alkali-Activated Stainless Steel Slag as a Cementitious Material in the Manufacture of Self-Compacting Concrete. Materials 2021, 14, 3945. https://doi.org/10.3390/ma14143945
Rosales J, Agrela F, Díaz-López JL, Cabrera M. Alkali-Activated Stainless Steel Slag as a Cementitious Material in the Manufacture of Self-Compacting Concrete. Materials. 2021; 14(14):3945. https://doi.org/10.3390/ma14143945
Chicago/Turabian StyleRosales, Julia, Francisco Agrela, José Luis Díaz-López, and Manuel Cabrera. 2021. "Alkali-Activated Stainless Steel Slag as a Cementitious Material in the Manufacture of Self-Compacting Concrete" Materials 14, no. 14: 3945. https://doi.org/10.3390/ma14143945