The Impact of Nano-Al<sub>2</sub>O<sub>3</sub> on the Physical and Strength Properties as Well as on the Morphology of Cement Composite Crack Surfaces in the Early and Later Maturation Age
This article presents the effect of aluminum nanoxide on the physical, strength and structural properties of cement mortars. The mortars were made with a water to binder ratio of 0.5 and a binder to sand ratio of 1:3; and 1%, 2%, 3% and 4% of aluminum nanoxide, respectively, were used by cement weig...
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MDPI AG
2021-08-01
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| Online Access: | https://www.mdpi.com/1996-1944/14/16/4441 |
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| author | Wioleta Iskra-Kozak Janusz Konkol |
| author_facet | Wioleta Iskra-Kozak Janusz Konkol |
| author_sort | Wioleta Iskra-Kozak |
| collection | DOAJ |
| description | This article presents the effect of aluminum nanoxide on the physical, strength and structural properties of cement mortars. The mortars were made with a water to binder ratio of 0.5 and a binder to sand ratio of 1:3; and 1%, 2%, 3% and 4% of aluminum nanoxide, respectively, were used by cement weight. First, the consistency of nano-Al<sub>2</sub>O<sub>3</sub> mortars was tested. Next, after 7 days of sample maturation, compressive and flexural strength tests were carried out and continued after 28 and 90 days of the maturing of the mortars. The best test results were obtained for mortars with the addition of 1% aluminum nanoxide, the compressive strength of which increased by about 20% compared to the reference mortars. The water absorption and rising capillary tests as well as SEM observations were also performed. Another aim of the article is the analysis of the fracture morphology of nano-Al<sub>2</sub>O<sub>3</sub> modified mortars. It is assumed that a change of the microstructure of the hardened cement paste affects not only the properties of the modified mortars but also the roughness of the fractures formed as a result of the destruction of the surface. Roughness analysis was performed with methods and tools relevant to fractal geometry. The fractographic analysis showed a significant influence of the modifier in the form of nano-Al<sub>2</sub>O<sub>3</sub> on the values of fractal dimensions. The lowest values of the fractal dimension <i>D</i> and the fractal dimension of the <i>D<sub>RP</sub></i> roughness profile of the fracture surface profile lines were obtained for nano-Al<sub>2</sub>O<sub>3</sub> modified mortars. The conducted research proved the fractal dimension to be a parameter extremely sensitive to modifications of mortar composition as well as changes related to the maturation time. |
| first_indexed | 2024-03-10T08:39:13Z |
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| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T08:39:13Z |
| publishDate | 2021-08-01 |
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| series | Materials |
| spelling | doaj.art-8cac127145b14d37993c485540b94e6a2023-11-22T08:27:34ZengMDPI AGMaterials1996-19442021-08-011416444110.3390/ma14164441The Impact of Nano-Al<sub>2</sub>O<sub>3</sub> on the Physical and Strength Properties as Well as on the Morphology of Cement Composite Crack Surfaces in the Early and Later Maturation AgeWioleta Iskra-Kozak0Janusz Konkol1Faculty of Civil and Environmental Engineering and Architecture, Rzeszow University of Technology, Poznanska 2, 35084 Rzeszow, PolandFaculty of Civil and Environmental Engineering and Architecture, Rzeszow University of Technology, Poznanska 2, 35084 Rzeszow, PolandThis article presents the effect of aluminum nanoxide on the physical, strength and structural properties of cement mortars. The mortars were made with a water to binder ratio of 0.5 and a binder to sand ratio of 1:3; and 1%, 2%, 3% and 4% of aluminum nanoxide, respectively, were used by cement weight. First, the consistency of nano-Al<sub>2</sub>O<sub>3</sub> mortars was tested. Next, after 7 days of sample maturation, compressive and flexural strength tests were carried out and continued after 28 and 90 days of the maturing of the mortars. The best test results were obtained for mortars with the addition of 1% aluminum nanoxide, the compressive strength of which increased by about 20% compared to the reference mortars. The water absorption and rising capillary tests as well as SEM observations were also performed. Another aim of the article is the analysis of the fracture morphology of nano-Al<sub>2</sub>O<sub>3</sub> modified mortars. It is assumed that a change of the microstructure of the hardened cement paste affects not only the properties of the modified mortars but also the roughness of the fractures formed as a result of the destruction of the surface. Roughness analysis was performed with methods and tools relevant to fractal geometry. The fractographic analysis showed a significant influence of the modifier in the form of nano-Al<sub>2</sub>O<sub>3</sub> on the values of fractal dimensions. The lowest values of the fractal dimension <i>D</i> and the fractal dimension of the <i>D<sub>RP</sub></i> roughness profile of the fracture surface profile lines were obtained for nano-Al<sub>2</sub>O<sub>3</sub> modified mortars. The conducted research proved the fractal dimension to be a parameter extremely sensitive to modifications of mortar composition as well as changes related to the maturation time.https://www.mdpi.com/1996-1944/14/16/4441nanoparticlesnano-aluminacompressive strengthfractal dimension |
| spellingShingle | Wioleta Iskra-Kozak Janusz Konkol The Impact of Nano-Al<sub>2</sub>O<sub>3</sub> on the Physical and Strength Properties as Well as on the Morphology of Cement Composite Crack Surfaces in the Early and Later Maturation Age Materials nanoparticles nano-alumina compressive strength fractal dimension |
| title | The Impact of Nano-Al<sub>2</sub>O<sub>3</sub> on the Physical and Strength Properties as Well as on the Morphology of Cement Composite Crack Surfaces in the Early and Later Maturation Age |
| title_full | The Impact of Nano-Al<sub>2</sub>O<sub>3</sub> on the Physical and Strength Properties as Well as on the Morphology of Cement Composite Crack Surfaces in the Early and Later Maturation Age |
| title_fullStr | The Impact of Nano-Al<sub>2</sub>O<sub>3</sub> on the Physical and Strength Properties as Well as on the Morphology of Cement Composite Crack Surfaces in the Early and Later Maturation Age |
| title_full_unstemmed | The Impact of Nano-Al<sub>2</sub>O<sub>3</sub> on the Physical and Strength Properties as Well as on the Morphology of Cement Composite Crack Surfaces in the Early and Later Maturation Age |
| title_short | The Impact of Nano-Al<sub>2</sub>O<sub>3</sub> on the Physical and Strength Properties as Well as on the Morphology of Cement Composite Crack Surfaces in the Early and Later Maturation Age |
| title_sort | impact of nano al sub 2 sub o sub 3 sub on the physical and strength properties as well as on the morphology of cement composite crack surfaces in the early and later maturation age |
| topic | nanoparticles nano-alumina compressive strength fractal dimension |
| url | https://www.mdpi.com/1996-1944/14/16/4441 |
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