Development and Characterization of Lightweight Geopolymer Composite Reinforced with Hybrid Carbon and Steel Fibers
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Samples Preparation
2.3. Methods
- The samples were cleaned, and loose debris was removed so that they did not come into contact with the clamping plates.
- The samples were placed in the testing machine so that they were in the center of the lower pressure plate.
- The load direction was perpendicular to the direction in which the samples were formed.
- A constant load speed of 0.5 N/mm2∙s was assumed.
- The load was increased continuously until the maximum value was reached.
- The compressive strength was determined by the machine program from Formula (2):
- The samples were cleaned; loose debris was removed so that they would not come into contact with the rollers (the gap between rollers was 150 mm).
- The samples were placed in the testing machine so that they were properly centered and that their longitudinal axis was set at right angles to the longitudinal axis of both rollers.
- The load direction was perpendicular to the direction in which the samples were formed.
- A constant load speed of 0.05 N/mm2∙s was assumed.
- The load was increased continuously until the maximum value was reached.
- The bending strength was determined by the machine program from Formula (3):
3. Results and Discussion
3.1. Density and Microstructure Research
3.2. Compressive Strength
3.3. Bending Strength
3.4. Thermal Conductivity of Lightweight Matrix
4. Discussion
- In a study carried out on a geopolymer material with a matrix made of fly ash and smoke silica-reinforced with hybrid hooked steel fiber and polypropylene (PP) fiber, the same relationship was observed for the bending strength as for compressive strength. With the increasing content of steel fibers, the value of the bending strength of composites increases [48].
- In the study of a geopolymer composite with a matrix made of fly ash and slag reinforced with hybrid fibers corrugated and hooked steel fibers and PE fiber, it was observed that the strength properties of the hybrid reinforced composites were higher in the bending strength test. In the composite without the addition of fibers, the bending strength reached the lowest value of 3.89 MPa. In turn, the highest value of 11.3 MPa was achieved in a composite containing 0.8% by volume of crimped and hooked fibers and 0.4% by volume of PE [49].
- In a study conducted on a geopolymer composite with a matrix made of fly ash and sand reinforced with hybrid hooked steel and melamine fibers, the results of bending strength showed that he addition of melamine fibers as well as steel fibers increased the flexural strength in comparison to the plain matrix. The best results were obtained for the combination of both types of fibers but not exceeding the maximum value of 1% by weight [2].
5. Conclusions
- All the obtained composites have densities in the range of approx. 0.89–0.93 g/cm3. Therefore, they can be classified as lightweight aggregate concretes.
- The best compressive strength is obtained for a steel fiber (2.0% by weight).
- In all cases, the addition of reinforcing fibers to lightweight geopolymer composites significantly improves the bending strength value and may change the fractured nature of the brittle material to a more ductile one. The best bending strength is obtained for the hybrid reinforced composite: 1.5 wt.% CFs and 0.5 wt.% SFs.
- Analysis of the microstructure of the steel and carbon fiber-reinforced composite shows good coherence of the fibers with the matrix.
- The geopolymer composite is characterized by low thermal conductivity (0.22 W/m K) at low density, giving values comparable to aerated concrete blocks. Geopolymer matrix is made of fly ash and microspheres and is therefore characterized by better thermal insulation properties (0.18 W/m K).
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Chemical Formula | % | Chemical Formula | Concentration % |
---|---|---|---|
SiO2 | 52.076 | BaO | 0.060 |
Al2O3 | 28.697 | SrO | 0.053 |
Fe2O3 | 5.767 | Cl | 0.048 |
CaO | 3.467 | ZrO2 | 0.028 |
K2O | 2.424 | ZnO | 0.024 |
Na2O | 2.384 | CuO | 0.023 |
MgO | 1.997 | Cr2O3 | 0.020 |
SO3 | 1.220 | Co3O4 | 0.018 |
TiO2 | 1.107 | PbO | 0.017 |
P2O5 | 0.475 | NiO | 0.017 |
MnO | 0.060 | Rb2O | 0.016 |
No. | FA [g] | MS [g] | Alkali Solution [mL] | SFs [g] | CFs [g] |
---|---|---|---|---|---|
1 | 980 | 980 | 900 | 0 | 0 |
2 | 980 | 980 | 900 | 0 | 40 |
3 | 980 | 980 | 900 | 10 | 30 |
4 | 980 | 980 | 900 | 20 | 20 |
5 | 980 | 980 | 900 | 30 | 10 |
6 | 980 | 980 | 900 | 40 | 0 |
Sample | Dimensions [mm] | Weight [kg] |
---|---|---|
Geopolymer (50 wt.% FA + 50 wt.% sand) | 137.6 × 138.2 × 26.2 | 0.428 |
Geopolymer (50 wt.% FA + 50 wt.% MS) | 137.3 × 138.4 × 25.5 | 0.648 |
Sample | ρ [kg/m3] | λ [W/m·K] | Rs [MPa] |
---|---|---|---|
Geopolymer (50 wt.% FA + 50 wt.% sand) | 1339 | 0.22 | 42.0 |
Geopolymer (50 wt.% FA + 50 wt.% MS) | 859 | 0.18 | 14.8 |
Sample | ρ [kg/m3] | λ [W/m·K] | Rs [MPa] |
---|---|---|---|
Silicate brick | 900–2200 | 1.10 | 7.5–15.0 |
Ceramic brick | 1800 | 0.77 | 5.0–35.0 and more |
Aerated concrete block | 300–1000 | 0.20 | 2.0–7.5 |
Reinforced concrete | 2400 | 1.80 | 20–150 and more |
Mineral wool | 10–200 | 0.055 | |
Styrofoam | 10–50 | 0.040 | |
Wood | 550 | 0.20 | |
Lime plaster | 1700 | 0.80 | 0.3–4.0 |
Cement-lime plaster | 1850 | 0.90 | 1–20 |
Cement plaster | 2000 | 1.20 | 1–30 |
Plasterboard | 1000 | 0.9 | |
Geopolymer (50 wt.% FA + 50 wt.% sand) | 1339 | 0.22 | 42.0 |
Geopolymer (50 wt.% FA + 50 wt.% MS) | 859 | 0.18 | 14.8 |
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Baziak, A.; Pławecka, K.; Hager, I.; Castel, A.; Korniejenko, K. Development and Characterization of Lightweight Geopolymer Composite Reinforced with Hybrid Carbon and Steel Fibers. Materials 2021, 14, 5741. https://doi.org/10.3390/ma14195741
Baziak A, Pławecka K, Hager I, Castel A, Korniejenko K. Development and Characterization of Lightweight Geopolymer Composite Reinforced with Hybrid Carbon and Steel Fibers. Materials. 2021; 14(19):5741. https://doi.org/10.3390/ma14195741
Chicago/Turabian StyleBaziak, Agnieszka, Kinga Pławecka, Izabela Hager, Arnaud Castel, and Kinga Korniejenko. 2021. "Development and Characterization of Lightweight Geopolymer Composite Reinforced with Hybrid Carbon and Steel Fibers" Materials 14, no. 19: 5741. https://doi.org/10.3390/ma14195741