Performance evolution and tensile behaviour of long-term exposed UHPC under sustained load, aggressive environments and autogenous healing
An extended experimental campaign was conducted to analyse the evolution of UHPC tensile performance over time as affected by sustained flexural load and aggressive environments both interacting with its autogenous self-healing capacity. A new methodology including both destructive and non-destructi...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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EDP Sciences
2023-01-01
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| Series: | MATEC Web of Conferences |
| Online Access: | https://www.matec-conferences.org/articles/matecconf/pdf/2023/05/matecconf_smartincs2023_08002.pdf |
| _version_ | 1797835237680480256 |
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| author | Davolio Marco Recchia Giovanni Altomare Maria Ylenia Soave Francesco Al-Obaidi Salam Ferrara Liberato |
| author_facet | Davolio Marco Recchia Giovanni Altomare Maria Ylenia Soave Francesco Al-Obaidi Salam Ferrara Liberato |
| author_sort | Davolio Marco |
| collection | DOAJ |
| description | An extended experimental campaign was conducted to analyse the evolution of UHPC tensile performance over time as affected by sustained flexural load and aggressive environments both interacting with its autogenous self-healing capacity. A new methodology including both destructive and non-destructive tests was proposed. Three different mix designs were tested, with steel fibres, crystalline admixture, and various nanomaterials. Specifically, the first batch included alumina nano-fibres, while the second one cellulose nanocrystals. The last one was used as a reference and did not include nanomaterials. Thin beam specimens (500x100x30 mm) were pre-cracked and exposed to three different environments, under four-point bending sustained load. The specimens were cured for 1, 2, 3, 6, 9, and 12 months respectively, being exposed to a chloride solution, geothermal water, and tap water as a reference. After the aforesaid scheduled exposure times, two nominally identical specimens were tested for each condition, the first in four-point bending and the second in direct tension. To compare the results, a simplified five-point inverse analysis was adapted for beams with different slenderness, providing a quadrilinear constitutive law derived from the structural flexural behaviour of four-point bending tests. Test results allowed to highlight the effects of each parameter – type of material and exposure – on the self-healing effectiveness and the tensile response, also defining their evolution over time. The self-healing process resulted in an almost complete recovery after the first two or three months, and the materials were able to maintain a constant performance over longer periods, regardless of the conditions they were exposed to. |
| first_indexed | 2024-04-09T14:50:54Z |
| format | Article |
| id | doaj.art-5cb48aec21db444286e727d2e45eca8e |
| institution | Directory Open Access Journal |
| issn | 2261-236X |
| language | English |
| last_indexed | 2024-04-09T14:50:54Z |
| publishDate | 2023-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | MATEC Web of Conferences |
| spelling | doaj.art-5cb48aec21db444286e727d2e45eca8e2023-05-02T09:34:12ZengEDP SciencesMATEC Web of Conferences2261-236X2023-01-013780800210.1051/matecconf/202337808002matecconf_smartincs2023_08002Performance evolution and tensile behaviour of long-term exposed UHPC under sustained load, aggressive environments and autogenous healingDavolio Marco0Recchia Giovanni1Altomare Maria Ylenia2Soave Francesco3Al-Obaidi Salam4Ferrara Liberato5Politecnico di Milano, Department of Civil and Environmental EngineeringPolitecnico di Milano, Department of Civil and Environmental EngineeringPolitecnico di Milano, Department of Civil and Environmental EngineeringPolitecnico di Milano, Department of Civil and Environmental EngineeringPolitecnico di Milano, Department of Civil and Environmental EngineeringPolitecnico di Milano, Department of Civil and Environmental EngineeringAn extended experimental campaign was conducted to analyse the evolution of UHPC tensile performance over time as affected by sustained flexural load and aggressive environments both interacting with its autogenous self-healing capacity. A new methodology including both destructive and non-destructive tests was proposed. Three different mix designs were tested, with steel fibres, crystalline admixture, and various nanomaterials. Specifically, the first batch included alumina nano-fibres, while the second one cellulose nanocrystals. The last one was used as a reference and did not include nanomaterials. Thin beam specimens (500x100x30 mm) were pre-cracked and exposed to three different environments, under four-point bending sustained load. The specimens were cured for 1, 2, 3, 6, 9, and 12 months respectively, being exposed to a chloride solution, geothermal water, and tap water as a reference. After the aforesaid scheduled exposure times, two nominally identical specimens were tested for each condition, the first in four-point bending and the second in direct tension. To compare the results, a simplified five-point inverse analysis was adapted for beams with different slenderness, providing a quadrilinear constitutive law derived from the structural flexural behaviour of four-point bending tests. Test results allowed to highlight the effects of each parameter – type of material and exposure – on the self-healing effectiveness and the tensile response, also defining their evolution over time. The self-healing process resulted in an almost complete recovery after the first two or three months, and the materials were able to maintain a constant performance over longer periods, regardless of the conditions they were exposed to.https://www.matec-conferences.org/articles/matecconf/pdf/2023/05/matecconf_smartincs2023_08002.pdf |
| spellingShingle | Davolio Marco Recchia Giovanni Altomare Maria Ylenia Soave Francesco Al-Obaidi Salam Ferrara Liberato Performance evolution and tensile behaviour of long-term exposed UHPC under sustained load, aggressive environments and autogenous healing MATEC Web of Conferences |
| title | Performance evolution and tensile behaviour of long-term exposed UHPC under sustained load, aggressive environments and autogenous healing |
| title_full | Performance evolution and tensile behaviour of long-term exposed UHPC under sustained load, aggressive environments and autogenous healing |
| title_fullStr | Performance evolution and tensile behaviour of long-term exposed UHPC under sustained load, aggressive environments and autogenous healing |
| title_full_unstemmed | Performance evolution and tensile behaviour of long-term exposed UHPC under sustained load, aggressive environments and autogenous healing |
| title_short | Performance evolution and tensile behaviour of long-term exposed UHPC under sustained load, aggressive environments and autogenous healing |
| title_sort | performance evolution and tensile behaviour of long term exposed uhpc under sustained load aggressive environments and autogenous healing |
| url | https://www.matec-conferences.org/articles/matecconf/pdf/2023/05/matecconf_smartincs2023_08002.pdf |
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