SIFAT MEKANIK BETON BERSERAT BAJA DENGAN METODE PENGERJAAN PRALETAK AGREGAT
The addition of fibers into conventional concrete mixture will produce fiber-reinforced concrete, in which its properties differ from its original plain concrete. Fiber-reinforced concrete produced with conventional methods have higher flexural-tensile strength and ductility, but with a relatively c...
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| Format: | Thesis |
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[Yogyakarta] : Universitas Gadjah Mada
2013
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| author | , Sam Randa , Prof. Ir. Iman Satyarno, M.E., Ph.D. |
| author_facet | , Sam Randa , Prof. Ir. Iman Satyarno, M.E., Ph.D. |
| author_sort | , Sam Randa |
| collection | UGM |
| description | The addition of fibers into conventional concrete mixture will produce fiber-reinforced concrete, in which its properties differ from its original plain concrete. Fiber-reinforced concrete produced with conventional methods have higher flexural-tensile strength and ductility, but with a relatively constant compressive strength compared to its original plain concrete. Previous studies have shown that the mechanical properties of fiber-reinforced concrete is directly influenced by reinforcing index of the added fibers. Fiber reinforcing index is defined as the product of the volumetric fiber content and fiber aspect ratio. Value of reinforcing index addition to this conventionally produced FRC is limited by the problems of workability and homogeneity due to fiber balling in the mixer. Reinforcing index value that can be achieved with conventional methods generally less than 1,0.
This thesis reports studies on an alternative method in producing fiber reinforced concrete i.e. by preplacing a mixture of coarse aggregates and steel fibers in a confining mold. The stones and fibers mix were then infiltrated by flowable cement-based mortar grout which formed a sound fiber reinforced concrete after its hardening. Experimental studies were conducted to study the relationship of fiber reinforcing index on the mechanical properties of preplaced-aggregate-fiber concrete. Steel fiber used is of single type with an aspect ratio of 80. Reinforcing indices investigated were 0,0, 1,0, 1,6 and 2,0. Mechanical properties of concrete that were investigated including ultrasonic pulse velocity, elastic modulus, compressive strength, flexural-tensile strength and toughness. In addition, the study also reported physical properties of concrete including density, water absorption and volume of permeable voids. Studies in selecting grouting mortar are also reported to describe recommended practice of grout proportioning that can be applied for this concreting purpose.
Results show that fibers addition significantly improve the mechanical properties of concrete. It is found that there is a strong correlation between mechanical properties of concrete with its reinforcing index values. For plain concrete to fibrous concrete with reinforcing index of 2,0 compressive strength increased linearly from 21,9 MPa to 46,9 MPa respectively. Moreover, flexural-tensile strength of corresponding concrete increased exponentially from 3,3 MPa to 21,9. On the other hand, the modulus of elasticity decreased linearly with the addition of fiber reinforcing index, i.e. from 31.700 MPa to 23.700 MPa. Physical properties of the produced concrete indicate that the concrete has sufficient level of durability for application in general structures. |
| first_indexed | 2024-03-13T22:53:58Z |
| format | Thesis |
| id | oai:generic.eprints.org:120809 |
| institution | Universiti Gadjah Mada |
| last_indexed | 2024-03-13T22:53:58Z |
| publishDate | 2013 |
| publisher | [Yogyakarta] : Universitas Gadjah Mada |
| record_format | dspace |
| spelling | oai:generic.eprints.org:1208092016-03-04T08:43:30Z https://repository.ugm.ac.id/120809/ SIFAT MEKANIK BETON BERSERAT BAJA DENGAN METODE PENGERJAAN PRALETAK AGREGAT , Sam Randa , Prof. Ir. Iman Satyarno, M.E., Ph.D. ETD The addition of fibers into conventional concrete mixture will produce fiber-reinforced concrete, in which its properties differ from its original plain concrete. Fiber-reinforced concrete produced with conventional methods have higher flexural-tensile strength and ductility, but with a relatively constant compressive strength compared to its original plain concrete. Previous studies have shown that the mechanical properties of fiber-reinforced concrete is directly influenced by reinforcing index of the added fibers. Fiber reinforcing index is defined as the product of the volumetric fiber content and fiber aspect ratio. Value of reinforcing index addition to this conventionally produced FRC is limited by the problems of workability and homogeneity due to fiber balling in the mixer. Reinforcing index value that can be achieved with conventional methods generally less than 1,0. This thesis reports studies on an alternative method in producing fiber reinforced concrete i.e. by preplacing a mixture of coarse aggregates and steel fibers in a confining mold. The stones and fibers mix were then infiltrated by flowable cement-based mortar grout which formed a sound fiber reinforced concrete after its hardening. Experimental studies were conducted to study the relationship of fiber reinforcing index on the mechanical properties of preplaced-aggregate-fiber concrete. Steel fiber used is of single type with an aspect ratio of 80. Reinforcing indices investigated were 0,0, 1,0, 1,6 and 2,0. Mechanical properties of concrete that were investigated including ultrasonic pulse velocity, elastic modulus, compressive strength, flexural-tensile strength and toughness. In addition, the study also reported physical properties of concrete including density, water absorption and volume of permeable voids. Studies in selecting grouting mortar are also reported to describe recommended practice of grout proportioning that can be applied for this concreting purpose. Results show that fibers addition significantly improve the mechanical properties of concrete. It is found that there is a strong correlation between mechanical properties of concrete with its reinforcing index values. For plain concrete to fibrous concrete with reinforcing index of 2,0 compressive strength increased linearly from 21,9 MPa to 46,9 MPa respectively. Moreover, flexural-tensile strength of corresponding concrete increased exponentially from 3,3 MPa to 21,9. On the other hand, the modulus of elasticity decreased linearly with the addition of fiber reinforcing index, i.e. from 31.700 MPa to 23.700 MPa. Physical properties of the produced concrete indicate that the concrete has sufficient level of durability for application in general structures. [Yogyakarta] : Universitas Gadjah Mada 2013 Thesis NonPeerReviewed , Sam Randa and , Prof. Ir. Iman Satyarno, M.E., Ph.D. (2013) SIFAT MEKANIK BETON BERSERAT BAJA DENGAN METODE PENGERJAAN PRALETAK AGREGAT. UNSPECIFIED thesis, UNSPECIFIED. http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=60847 |
| spellingShingle | ETD , Sam Randa , Prof. Ir. Iman Satyarno, M.E., Ph.D. SIFAT MEKANIK BETON BERSERAT BAJA DENGAN METODE PENGERJAAN PRALETAK AGREGAT |
| title | SIFAT MEKANIK BETON BERSERAT BAJA DENGAN METODE PENGERJAAN PRALETAK AGREGAT |
| title_full | SIFAT MEKANIK BETON BERSERAT BAJA DENGAN METODE PENGERJAAN PRALETAK AGREGAT |
| title_fullStr | SIFAT MEKANIK BETON BERSERAT BAJA DENGAN METODE PENGERJAAN PRALETAK AGREGAT |
| title_full_unstemmed | SIFAT MEKANIK BETON BERSERAT BAJA DENGAN METODE PENGERJAAN PRALETAK AGREGAT |
| title_short | SIFAT MEKANIK BETON BERSERAT BAJA DENGAN METODE PENGERJAAN PRALETAK AGREGAT |
| title_sort | sifat mekanik beton berserat baja dengan metode pengerjaan praletak agregat |
| topic | ETD |
| work_keys_str_mv | AT samranda sifatmekanikbetonberseratbajadenganmetodepengerjaanpraletakagregat AT profirimansatyarnomephd sifatmekanikbetonberseratbajadenganmetodepengerjaanpraletakagregat |