Fracture toughness and failure mechanism of high performance concrete incorporating carbon nanotubes
Cement and concrete composites are inherently brittle and exhibit very less tensile/flexural strength capacity as compared to their compressive strength. Use of thoroughly dispersed carbon nanotubes in the concrete matrix is one of the possible solution for enhancing mechanical properties in tension...
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| Format: | Article |
| Language: | English |
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Gruppo Italiano Frattura
2017-09-01
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| Series: | Fracture and Structural Integrity |
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| Online Access: | https://www.fracturae.com/index.php/fis/article/view/1948 |
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| author | Anwar Khitab Sajjad Ahmad Rao Arsalan Khushnood Syed Ali Rizwan Giuseppe Andrea Ferro Luciana Restuccia Mustajab Ali Imran Mehmood |
| author_facet | Anwar Khitab Sajjad Ahmad Rao Arsalan Khushnood Syed Ali Rizwan Giuseppe Andrea Ferro Luciana Restuccia Mustajab Ali Imran Mehmood |
| author_sort | Anwar Khitab |
| collection | DOAJ |
| description | Cement and concrete composites are inherently brittle and exhibit very less tensile/flexural strength capacity as compared to their compressive strength. Use of thoroughly dispersed carbon nanotubes in the concrete matrix is one of the possible solution for enhancing mechanical properties in tension/flexure. In the present research work, small fractions of multiwall carbon nanotube (MWCNTs) i.e. 0.05 and 0.10 wt% of cement have been integrated into the cement concrete to study their effect on the mechanical properties of the resultant concrete mixtures. The enhanced performance of the whole mix lies on a single point that MWCNTs must be thoroughly disperse in the mixture. Hence, special arrangement through usage of high energy sonication along with amended acrylic based polymer (performing as a surfactant) was made to have a uniform dispersion of MWCNTs in the concrete mix. The testing of concrete samples includes i.e., flexure, splitting tensile and compressive strengths after 3, 7, 28 and 56 days of curing. After having comparison with the control mix cured for 28 days, it was observed that the addition of 0.05 wt% MWCNTs increased the splitting tensile strength by 20.58%, flexural strength by 26.29% and compressive strength by 15.60%. Through above results, which verify the increase in concrete mix strength after adding MWCNTs, these MWCNTs may be incorporated in the treatment of Nano/micro cracks completed through process of connecting, branching and pinning. Similarly, as proved in threepoint bending tests, MWCNTs also enhances the breaking strains as well as the fracture energy of the concrete mixes, besides, imparting increase to the strength. The investigations have shown that incorporating lesser amounts of MWCNTs i.e., 0.05 and 0.10 wt% of cement to the concrete mixes after insuring there complete dispersion, unusually improve their properties like mechanical strengths and fracture behavior. |
| format | Article |
| id | doaj-art-b50ecb8f75684e0e90a5785de37b3b3f |
| institution | Kabale University |
| issn | 1971-8993 |
| language | English |
| publishDate | 2017-09-01 |
| publisher | Gruppo Italiano Frattura |
| record_format | Article |
| series | Fracture and Structural Integrity |
| spelling | doaj-art-b50ecb8f75684e0e90a5785de37b3b3f2025-01-03T00:40:27ZengGruppo Italiano FratturaFracture and Structural Integrity1971-89932017-09-011142Fracture toughness and failure mechanism of high performance concrete incorporating carbon nanotubesAnwar Khitab0Sajjad Ahmad1Rao Arsalan Khushnood2Syed Ali Rizwan3Giuseppe Andrea Ferro4Luciana Restuccia5Mustajab Ali6Imran Mehmood7Mirpur University of Science and Technology, Mirpur AJK, PakistanMirpur University of Science and Technology, Mirpur AJK, PakistanNational University of Sciences and Technology, Islamabad, PakistanNational University of Sciences and Technology, Islamabad, PakistanPolitecnico di Torino, Turin, ItalyPolitecnico di Torino, Turin, ItalyMirpur University of Science and Technology, Mirpur AJK, PakistanMirpur University of Science and Technology, Mirpur AJK, PakistanCement and concrete composites are inherently brittle and exhibit very less tensile/flexural strength capacity as compared to their compressive strength. Use of thoroughly dispersed carbon nanotubes in the concrete matrix is one of the possible solution for enhancing mechanical properties in tension/flexure. In the present research work, small fractions of multiwall carbon nanotube (MWCNTs) i.e. 0.05 and 0.10 wt% of cement have been integrated into the cement concrete to study their effect on the mechanical properties of the resultant concrete mixtures. The enhanced performance of the whole mix lies on a single point that MWCNTs must be thoroughly disperse in the mixture. Hence, special arrangement through usage of high energy sonication along with amended acrylic based polymer (performing as a surfactant) was made to have a uniform dispersion of MWCNTs in the concrete mix. The testing of concrete samples includes i.e., flexure, splitting tensile and compressive strengths after 3, 7, 28 and 56 days of curing. After having comparison with the control mix cured for 28 days, it was observed that the addition of 0.05 wt% MWCNTs increased the splitting tensile strength by 20.58%, flexural strength by 26.29% and compressive strength by 15.60%. Through above results, which verify the increase in concrete mix strength after adding MWCNTs, these MWCNTs may be incorporated in the treatment of Nano/micro cracks completed through process of connecting, branching and pinning. Similarly, as proved in threepoint bending tests, MWCNTs also enhances the breaking strains as well as the fracture energy of the concrete mixes, besides, imparting increase to the strength. The investigations have shown that incorporating lesser amounts of MWCNTs i.e., 0.05 and 0.10 wt% of cement to the concrete mixes after insuring there complete dispersion, unusually improve their properties like mechanical strengths and fracture behavior.https://www.fracturae.com/index.php/fis/article/view/1948ConcreteFracture energyMWCNTsToughnessCritical pullout lengthMicro cracking |
| spellingShingle | Anwar Khitab Sajjad Ahmad Rao Arsalan Khushnood Syed Ali Rizwan Giuseppe Andrea Ferro Luciana Restuccia Mustajab Ali Imran Mehmood Fracture toughness and failure mechanism of high performance concrete incorporating carbon nanotubes Fracture and Structural Integrity Concrete Fracture energy MWCNTs Toughness Critical pullout length Micro cracking |
| title | Fracture toughness and failure mechanism of high performance concrete incorporating carbon nanotubes |
| title_full | Fracture toughness and failure mechanism of high performance concrete incorporating carbon nanotubes |
| title_fullStr | Fracture toughness and failure mechanism of high performance concrete incorporating carbon nanotubes |
| title_full_unstemmed | Fracture toughness and failure mechanism of high performance concrete incorporating carbon nanotubes |
| title_short | Fracture toughness and failure mechanism of high performance concrete incorporating carbon nanotubes |
| title_sort | fracture toughness and failure mechanism of high performance concrete incorporating carbon nanotubes |
| topic | Concrete Fracture energy MWCNTs Toughness Critical pullout length Micro cracking |
| url | https://www.fracturae.com/index.php/fis/article/view/1948 |
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