Effect of High-Dispersible Graphene on the Strength and Durability of Cement Mortars
Abstract
:1. Introduction
2. Experiment
2.1. Materials
2.2. Preparation of Modified Cement Mortars
3. Test Methods
3.1. UV-Vis Spectroscopy and Raman Test
3.2. MIP Test
3.3. FT-IR Test
3.4. Mechanical Strength Test
3.5. Water Absorption and Chloride Penetration Tests
4. Results and Discussion
4.1. UV-Vis Spectrum of GO and TiO2-RGO
4.2. Raman Analysis
4.3. Pore Structure
4.4. FT-IR Analysis
4.5. Compressive and Flexural Strength of Modified Cement Mortars
4.6. Water Absorption
4.7. Chloride Penetration
5. Conclusions
- The UV-vis spectroscopy test with GO and TiO2-RGO shows that TiO2-RGO can be uniformly dispersed in water and TiO2-RGO has better dispersion compared with GO. The Raman result demonstrates the successful incorporation of TiO2 between graphene sheets, which is the reason for the superior dispersion of TiO2-RGO.
- The FT-IR results of cement mortars’ hydration products show that the content of GO and TiO2-RGO does not generate new products. The MIP test of modified cement shows that GO and TiO2-RGO can improve the distribution of pore structure in cement mortars, increase the number of small isolated capillaries and medium capillaries in cement mortars, reduce large capillaries, and decrease the porosity of cement mortars, thus improving the strength and durability of modified cement mortars. In addition, compared with GO, TiO2-RGO has superior effect in improving the pore structure.
- The strength and durability tests of modified cement mortars show that the flexural and compressive strength, impermeability, and corrosion resistance of the modified cement mortars have been significantly improved. TiO2-RGO cement mortars have better performance than GO cement mortars at the same admixture amount. The optimal weights of GO and TiO2-RGO are both 0.03 wt% within the investigated range.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Compressive Strength | The Initial Setting Time | The Final Setting Time | Standard Consistence |
---|---|---|---|
42.5 MPa | 2.33 h | 4.01 h | 28.6% |
Type | Content |
---|---|
Calcium oxide | 64.5% |
Silicon dioxide | 19.1% |
Aluminum oxide | 4.95% |
Sulfur trioxide | 4.55% |
Ferric oxide | 3.53% |
Magnesium oxide | 1.83% |
Loss on ignition | 1.75% |
Square Mesh Size (µm) | 80 | 160 | 500 | 1000 | 1600 | 2000 |
Remaining on the Sieve (%) | 99 ± 1 | 87 ± 4 | 67 ± 4 | 33 ± 4 | 7 ± 4 | 0 |
Num | Cement (g) | Standard Sand (g) | W/C | GO | TiO2-RGO |
---|---|---|---|---|---|
M0 | 450 | 1350 | 0.42 | 0 | 0 |
Mg-0.01 | 450 | 1350 | 0.42 | 0.01% | 0 |
Mg-0.03 | 450 | 1350 | 0.42 | 0.03% | 0 |
Mg-0.05 | 450 | 1350 | 0.42 | 0.05% | 0 |
Mtg-0.01 | 450 | 1350 | 0.42 | 0 | 0.01% |
Mtg-0.03 | 450 | 1350 | 0.42 | 0 | 0.03% |
Mtg-0.05 | 450 | 1350 | 0.42 | 0 | 0.05% |
Group | Maximum Amount of Mercury (mL/g) | Average Diameters (nm) | Porosity (%) | Porosity Reduction (%) |
---|---|---|---|---|
M0 | 0.027 | 125 | 4.3 | 0 |
Mg-0.03 | 0.023 | 23 | 3.2 | 26 |
Mtg-0.03 | 0.019 | 17 | 2.6 | 40 |
Sample | Regression < 48 h | R | Capillary Water Absorption Coefficient (g/m2 h1/2) |
---|---|---|---|
M0 | y = 141.181 ×+ 7.833 | 0.979 | 141.181 |
Mg-0.01 | y = 90.167 ×+ 5.768 | 0.972 | 90.167 |
Mg-0.03 | y = 44.088 ×+ 3.101 | 0.966 | 44.088 |
Mg-0.05 | y = 101.248 ×+ 10.141 | 0.934 | 101.248 |
Mtg-0.01 | y = 57.582 ×+ 4.234 | 0.963 | 57.582 |
Mtg-0.03 | y = 39.591 ×+ 1.871 | 0.985 | 39.591 |
Mtg-0.05 | y = 62.417 ×+ 3.166 | 0.982 | 62.417 |
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Qi, X.; Zhang, S.; Wang, T.; Guo, S.; Ren, R. Effect of High-Dispersible Graphene on the Strength and Durability of Cement Mortars. Materials 2021, 14, 915. https://0-doi-org.brum.beds.ac.uk/10.3390/ma14040915
Qi X, Zhang S, Wang T, Guo S, Ren R. Effect of High-Dispersible Graphene on the Strength and Durability of Cement Mortars. Materials. 2021; 14(4):915. https://0-doi-org.brum.beds.ac.uk/10.3390/ma14040915
Chicago/Turabian StyleQi, Xiaoqiang, Sulei Zhang, Tengteng Wang, Siyao Guo, and Rui Ren. 2021. "Effect of High-Dispersible Graphene on the Strength and Durability of Cement Mortars" Materials 14, no. 4: 915. https://0-doi-org.brum.beds.ac.uk/10.3390/ma14040915