High-temperature behavior of structural and non-structural shotcretes.
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| Title: | High-temperature behavior of structural and non-structural shotcretes. |
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| Authors: | Bamonte, Patrick1 patrick.bamonte@polimi.it, Gambarova, Pietro G.1, Nafarieh, Alireza1 |
| Source: | Cement & Concrete Composites. Oct2016, Vol. 73, p42-53. 12p. |
| Subjects: | Effect of temperature on concrete, Rocks, Stability (Mechanics), Mechanical behavior of materials, Thermal properties of concrete |
| Abstract: | Sprayed concrete (shotcrete) is well known as a reliable and effective material for rock stabilization, fire proofing of metallic structures and jacketing of R/C members. Shotcrete structural applications, however, have been so far very limited mainly because of some concerns about material’s durability and high-temperature behavior. The latter issue is the starting point of this research project aimed to investigate the thermo-mechanical properties of three shotcretes containing different accelerating agents (based on sodium silicates in one mix – C1, and on sulfo-aluminates in two mixes – C2/C2F, no steel fibers/with steel fibers). The objective is to check (a) whether the heat-triggered mechanical decay of shotcrete is similar to that of ordinary concrete, and (b) how shotcrete low thermal diffusivity and relatively large porosity evolve at high temperature. The mechanical properties in compression are investigated both at high temperature (hot tests, C2 and C2F) and past cooling (residual tests, all mixes). In terms of normalized mechanical decay, the two shotcretes containing an alkali-free accelerating agent behave similarly to ordinary concrete, while the shotcrete with an alkaline accelerating agent is more heat and age sensitive. Up to 850 °C, all mixes exhibit a markedly lower thermal diffusivity compared with ordinary concrete, and a higher porosity. Furthermore, the rather low mechanical properties of the shotcrete with an alkaline accelerator with respect to the base material make it hardly fit for structural purposes, while the two shotcretes with an alkali-free accelerator are as good as any ordinary concrete even at high temperature, as demonstrated by the basic structural application presented at the end of the paper, concerning the lining of a circular deep R/C tunnel exposed to the standard fire. [ABSTRACT FROM AUTHOR] |
| Copyright of Cement & Concrete Composites is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 118267643 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: High-temperature behavior of structural and non-structural shotcretes. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Bamonte%2C+Patrick%22">Bamonte, Patrick</searchLink><relatesTo>1</relatesTo><i> patrick.bamonte@polimi.it</i><br /><searchLink fieldCode="AR" term="%22Gambarova%2C+Pietro+G%2E%22">Gambarova, Pietro G.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Nafarieh%2C+Alireza%22">Nafarieh, Alireza</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Cement+%26+Concrete+Composites%22">Cement & Concrete Composites</searchLink>. Oct2016, Vol. 73, p42-53. 12p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Effect+of+temperature+on+concrete%22">Effect of temperature on concrete</searchLink><br /><searchLink fieldCode="DE" term="%22Rocks%22">Rocks</searchLink><br /><searchLink fieldCode="DE" term="%22Stability+%28Mechanics%29%22">Stability (Mechanics)</searchLink><br /><searchLink fieldCode="DE" term="%22Mechanical+behavior+of+materials%22">Mechanical behavior of materials</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+properties+of+concrete%22">Thermal properties of concrete</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Sprayed concrete (shotcrete) is well known as a reliable and effective material for rock stabilization, fire proofing of metallic structures and jacketing of R/C members. Shotcrete structural applications, however, have been so far very limited mainly because of some concerns about material’s durability and high-temperature behavior. The latter issue is the starting point of this research project aimed to investigate the thermo-mechanical properties of three shotcretes containing different accelerating agents (based on sodium silicates in one mix – C1, and on sulfo-aluminates in two mixes – C2/C2F, no steel fibers/with steel fibers). The objective is to check (a) whether the heat-triggered mechanical decay of shotcrete is similar to that of ordinary concrete, and (b) how shotcrete low thermal diffusivity and relatively large porosity evolve at high temperature. The mechanical properties in compression are investigated both at high temperature (hot tests, C2 and C2F) and past cooling (residual tests, all mixes). In terms of normalized mechanical decay, the two shotcretes containing an alkali-free accelerating agent behave similarly to ordinary concrete, while the shotcrete with an alkaline accelerating agent is more heat and age sensitive. Up to 850 °C, all mixes exhibit a markedly lower thermal diffusivity compared with ordinary concrete, and a higher porosity. Furthermore, the rather low mechanical properties of the shotcrete with an alkaline accelerator with respect to the base material make it hardly fit for structural purposes, while the two shotcretes with an alkali-free accelerator are as good as any ordinary concrete even at high temperature, as demonstrated by the basic structural application presented at the end of the paper, concerning the lining of a circular deep R/C tunnel exposed to the standard fire. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Cement & Concrete Composites is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.cemconcomp.2016.06.009 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 12 StartPage: 42 Subjects: – SubjectFull: Effect of temperature on concrete Type: general – SubjectFull: Rocks Type: general – SubjectFull: Stability (Mechanics) Type: general – SubjectFull: Mechanical behavior of materials Type: general – SubjectFull: Thermal properties of concrete Type: general Titles: – TitleFull: High-temperature behavior of structural and non-structural shotcretes. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Bamonte, Patrick – PersonEntity: Name: NameFull: Gambarova, Pietro G. – PersonEntity: Name: NameFull: Nafarieh, Alireza IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 10 Text: Oct2016 Type: published Y: 2016 Identifiers: – Type: issn-print Value: 09589465 Numbering: – Type: volume Value: 73 Titles: – TitleFull: Cement & Concrete Composites Type: main |
| ResultId | 1 |
