Corrosion Performance of Nano-TiO<sub>2</sub>-Modified Concrete under a Dry–Wet Sulfate Environment
This study compared the effects of the sulfate dry–wet cycle on the properties of ordinary concrete and nano-TiO<sub>2</sub>-modified concrete, including the mass loss rate, ultrasonic wave velocity, compressive strength, and XRD characteristics. In addition, a series of compression simu...
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MDPI AG
2021-10-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/14/19/5900 |
| _version_ | 1797515983583182848 |
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| author | Chao Xu Hao-Hao Liao You-Liang Chen Xi Du Bin Peng Tomas Manuel Fernandez-Steeger |
| author_facet | Chao Xu Hao-Hao Liao You-Liang Chen Xi Du Bin Peng Tomas Manuel Fernandez-Steeger |
| author_sort | Chao Xu |
| collection | DOAJ |
| description | This study compared the effects of the sulfate dry–wet cycle on the properties of ordinary concrete and nano-TiO<sub>2</sub>-modified concrete, including the mass loss rate, ultrasonic wave velocity, compressive strength, and XRD characteristics. In addition, a series of compression simulations carried out using the PFC2D software are also presented for comparison. The results show the following: (1) with an increase in dry–wet cycles, the damage to the concrete gradually increased, and adding nano-TiO<sub>2</sub> into ordinary concrete can improve the material’s sulfate resistance; (2) after 50 sulfate dry–wet cycles, the mass loss rate of ordinary concrete was –3.744%, while that of nano-TiO<sub>2</sub>-modified concrete was −1.363%; (3) the compressive strength of ordinary concrete was reduced from 41.53 to 25.12 MPa (a reduction of 39.51%), but the compressive strength of nano-TiO<sub>2</sub>-modified concrete was reduced from 49.91 to 32.12 MPa (a reduction of 35.64%); (4) after a sulfate dry–wet cycle, the nano-TiO<sub>2</sub>-modified concrete surface produced white crystalline products, considered to be ettringite based on the XRD analysis; (5) when considering the peak stress and strain of the concrete samples, the numerical results agreed well with the test results, indicating the reliability of the method. |
| first_indexed | 2024-03-10T06:55:54Z |
| format | Article |
| id | doaj.art-4c27858ea2444262bfdccfa69913c919 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T06:55:54Z |
| publishDate | 2021-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-4c27858ea2444262bfdccfa69913c9192023-11-22T16:28:54ZengMDPI AGMaterials1996-19442021-10-011419590010.3390/ma14195900Corrosion Performance of Nano-TiO<sub>2</sub>-Modified Concrete under a Dry–Wet Sulfate EnvironmentChao Xu0Hao-Hao Liao1You-Liang Chen2Xi Du3Bin Peng4Tomas Manuel Fernandez-Steeger5Department of Civil Engineering, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai 200093, ChinaDepartment of Civil Engineering, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai 200093, ChinaDepartment of Civil Engineering, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai 200093, ChinaDepartment of Civil Engineering, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai 200093, ChinaDepartment of Civil Engineering, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai 200093, ChinaDepartment of Engineering Geology, Institute of Applied Geosciences, Faculty VI Planning Building Environment, Technische Universität Berlin, 10587 Berlin, GermanyThis study compared the effects of the sulfate dry–wet cycle on the properties of ordinary concrete and nano-TiO<sub>2</sub>-modified concrete, including the mass loss rate, ultrasonic wave velocity, compressive strength, and XRD characteristics. In addition, a series of compression simulations carried out using the PFC2D software are also presented for comparison. The results show the following: (1) with an increase in dry–wet cycles, the damage to the concrete gradually increased, and adding nano-TiO<sub>2</sub> into ordinary concrete can improve the material’s sulfate resistance; (2) after 50 sulfate dry–wet cycles, the mass loss rate of ordinary concrete was –3.744%, while that of nano-TiO<sub>2</sub>-modified concrete was −1.363%; (3) the compressive strength of ordinary concrete was reduced from 41.53 to 25.12 MPa (a reduction of 39.51%), but the compressive strength of nano-TiO<sub>2</sub>-modified concrete was reduced from 49.91 to 32.12 MPa (a reduction of 35.64%); (4) after a sulfate dry–wet cycle, the nano-TiO<sub>2</sub>-modified concrete surface produced white crystalline products, considered to be ettringite based on the XRD analysis; (5) when considering the peak stress and strain of the concrete samples, the numerical results agreed well with the test results, indicating the reliability of the method.https://www.mdpi.com/1996-1944/14/19/5900nanodry–wet cyclecompressive strengthPFC2D |
| spellingShingle | Chao Xu Hao-Hao Liao You-Liang Chen Xi Du Bin Peng Tomas Manuel Fernandez-Steeger Corrosion Performance of Nano-TiO<sub>2</sub>-Modified Concrete under a Dry–Wet Sulfate Environment Materials nano dry–wet cycle compressive strength PFC2D |
| title | Corrosion Performance of Nano-TiO<sub>2</sub>-Modified Concrete under a Dry–Wet Sulfate Environment |
| title_full | Corrosion Performance of Nano-TiO<sub>2</sub>-Modified Concrete under a Dry–Wet Sulfate Environment |
| title_fullStr | Corrosion Performance of Nano-TiO<sub>2</sub>-Modified Concrete under a Dry–Wet Sulfate Environment |
| title_full_unstemmed | Corrosion Performance of Nano-TiO<sub>2</sub>-Modified Concrete under a Dry–Wet Sulfate Environment |
| title_short | Corrosion Performance of Nano-TiO<sub>2</sub>-Modified Concrete under a Dry–Wet Sulfate Environment |
| title_sort | corrosion performance of nano tio sub 2 sub modified concrete under a dry wet sulfate environment |
| topic | nano dry–wet cycle compressive strength PFC2D |
| url | https://www.mdpi.com/1996-1944/14/19/5900 |
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