Effect of hooked end steel fibers on strength and durability properties of ambient cured geopolymer concrete
Growing carbon emissions in the construction industry have warranted the use of alternative materials such as geopolymer concrete. At the same time exposure of concrete material to harsh environmental conditions has compelled to design of durable geopolymer concrete. The use of hooked-end steel fibe...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-07-01
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| Series: | Case Studies in Construction Materials |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214509523003029 |
| _version_ | 1797798907401469952 |
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| author | G. Laxmi Suresh Patil Nabil Hossiney H.K. Thejas |
| author_facet | G. Laxmi Suresh Patil Nabil Hossiney H.K. Thejas |
| author_sort | G. Laxmi |
| collection | DOAJ |
| description | Growing carbon emissions in the construction industry have warranted the use of alternative materials such as geopolymer concrete. At the same time exposure of concrete material to harsh environmental conditions has compelled to design of durable geopolymer concrete. The use of hooked-end steel fibers in conventional fiber-reinforced concrete has proven to improve its crack resistance, and thus, positively influence the durability properties of concrete structures. Nevertheless, limited studies explore the effect of hooked-end steel fibers on the strength and durability properties of ambient cured geopolymer concrete with a low NaOH content (i.e., 8 M concentration). In this study, ambient cured geopolymer concrete was prepared by fly ash, ground granulated blast furnace slag (GGBS), NaOH, Na2SiO3, manufactured sand, and natural coarse aggregates. Additionally, hooked-end steel fibers with an aspect ratio of 67 were added to the mix by volume fraction in dosages of 0 %, 0.5 %, 1 %, 1.5 %, and 2 %. The experimental results showed that the addition of fibers reduced the workability with a minimum slump of 70 mm and a maximum Vee Bee time of 8 s for mixes with 2 % steel fibers. The addition of fibers improved the compressive strength, split tensile strength, and flexural strength of geopolymer concrete, with a maximum strength of 41.44 MPa, 4.28 MPa, and 5.23 MPa at an optimum fiber dose of 1 %, respectively. Above the optimum dose, the strength of the steel fiber-reinforced geopolymer concrete (SFRGPC) was reduced. The depth of water penetration reduced in SFRGPC when compared to GPC. Moreover, the resistance to chloride ion penetration was not significantly affected by addition of steel fibers till optimum dose of 1 %. The scanning electron microscopic results revealed the positive effect of steel fibers in restricting the progression of cracks. This has resulted in smaller crack width in the SFRGPC when compared to GPC. Overall, steel fibers in optimum dose have improved the performance of geopolymer concrete and this will contribute towards low carbon material. |
| first_indexed | 2024-03-13T04:11:55Z |
| format | Article |
| id | doaj.art-d28071e525b74beaac043109372624d2 |
| institution | Directory Open Access Journal |
| issn | 2214-5095 |
| language | English |
| last_indexed | 2024-03-13T04:11:55Z |
| publishDate | 2023-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Construction Materials |
| spelling | doaj.art-d28071e525b74beaac043109372624d22023-06-21T06:54:36ZengElsevierCase Studies in Construction Materials2214-50952023-07-0118e02122Effect of hooked end steel fibers on strength and durability properties of ambient cured geopolymer concreteG. Laxmi0Suresh Patil1Nabil Hossiney2H.K. Thejas3PDA College of Engineering, Gulbarga, Karnataka, India; Department of Civil Engineering, CHRIST (Deemed to be University), Bengaluru, Karnataka, India; Corresponding author at: PDA College of Engineering, Gulbarga, Karnataka, India.Sharnbasva University, Vidya Nagar, Gulbarga, Karnataka, IndiaDepartment of Civil Engineering, CHRIST (Deemed to be University), Bengaluru, Karnataka, India; Corresponding author.Department of Civil Engineering, CHRIST (Deemed to be University), Bengaluru, Karnataka, IndiaGrowing carbon emissions in the construction industry have warranted the use of alternative materials such as geopolymer concrete. At the same time exposure of concrete material to harsh environmental conditions has compelled to design of durable geopolymer concrete. The use of hooked-end steel fibers in conventional fiber-reinforced concrete has proven to improve its crack resistance, and thus, positively influence the durability properties of concrete structures. Nevertheless, limited studies explore the effect of hooked-end steel fibers on the strength and durability properties of ambient cured geopolymer concrete with a low NaOH content (i.e., 8 M concentration). In this study, ambient cured geopolymer concrete was prepared by fly ash, ground granulated blast furnace slag (GGBS), NaOH, Na2SiO3, manufactured sand, and natural coarse aggregates. Additionally, hooked-end steel fibers with an aspect ratio of 67 were added to the mix by volume fraction in dosages of 0 %, 0.5 %, 1 %, 1.5 %, and 2 %. The experimental results showed that the addition of fibers reduced the workability with a minimum slump of 70 mm and a maximum Vee Bee time of 8 s for mixes with 2 % steel fibers. The addition of fibers improved the compressive strength, split tensile strength, and flexural strength of geopolymer concrete, with a maximum strength of 41.44 MPa, 4.28 MPa, and 5.23 MPa at an optimum fiber dose of 1 %, respectively. Above the optimum dose, the strength of the steel fiber-reinforced geopolymer concrete (SFRGPC) was reduced. The depth of water penetration reduced in SFRGPC when compared to GPC. Moreover, the resistance to chloride ion penetration was not significantly affected by addition of steel fibers till optimum dose of 1 %. The scanning electron microscopic results revealed the positive effect of steel fibers in restricting the progression of cracks. This has resulted in smaller crack width in the SFRGPC when compared to GPC. Overall, steel fibers in optimum dose have improved the performance of geopolymer concrete and this will contribute towards low carbon material.http://www.sciencedirect.com/science/article/pii/S2214509523003029Hooked end steel fibersStrengthDurabilityAmbient curedGeopolymer concrete |
| spellingShingle | G. Laxmi Suresh Patil Nabil Hossiney H.K. Thejas Effect of hooked end steel fibers on strength and durability properties of ambient cured geopolymer concrete Case Studies in Construction Materials Hooked end steel fibers Strength Durability Ambient cured Geopolymer concrete |
| title | Effect of hooked end steel fibers on strength and durability properties of ambient cured geopolymer concrete |
| title_full | Effect of hooked end steel fibers on strength and durability properties of ambient cured geopolymer concrete |
| title_fullStr | Effect of hooked end steel fibers on strength and durability properties of ambient cured geopolymer concrete |
| title_full_unstemmed | Effect of hooked end steel fibers on strength and durability properties of ambient cured geopolymer concrete |
| title_short | Effect of hooked end steel fibers on strength and durability properties of ambient cured geopolymer concrete |
| title_sort | effect of hooked end steel fibers on strength and durability properties of ambient cured geopolymer concrete |
| topic | Hooked end steel fibers Strength Durability Ambient cured Geopolymer concrete |
| url | http://www.sciencedirect.com/science/article/pii/S2214509523003029 |
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