1.
Purwanto; AyLie Han; B H W Hadikusomo
The influence of reverse loading sequence on the behaviour of beam-column joints Journal Article
In: IOP Conf. Series: Earth and Environmental Science, 2023.
@article{nokey,
title = {The influence of reverse loading sequence on the behaviour of beam-column joints},
author = {Purwanto and AyLie Han and B H W Hadikusomo},
url = {https://iopscience.iop.org/article/10.1088/1755-1315/1244/1/012006},
doi = {10.1088/1755-1315/1244/1/012006},
year = {2023},
date = {2023-10-07},
journal = {IOP Conf. Series: Earth and Environmental Science},
abstract = {The formation of plastic joints in the reinforced beam-to-column joint is influenced by a number of factors. The behaviour and location of this joint is of major importance since it defines the overall performance of the rigid framework when subjected to loading. Mandated by the majority of codes and standards, the strong-column weak-beam philosophy is used and recognized by the formation of this joint in the beam. This study looked into the effect of reverse loading to the behaviour of plastic joints as compared to a monotonic loading protocol. The study analysed the load-deformation behaviour and ultimate load carrying capacity while additional information is collected through visual observation on the failure and cracking pattern. The study concluded that the reverse loading negatively influenced the load carrying capacity, but negligibly affected the overall behaviour of the joint.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The formation of plastic joints in the reinforced beam-to-column joint is influenced by a number of factors. The behaviour and location of this joint is of major importance since it defines the overall performance of the rigid framework when subjected to loading. Mandated by the majority of codes and standards, the strong-column weak-beam philosophy is used and recognized by the formation of this joint in the beam. This study looked into the effect of reverse loading to the behaviour of plastic joints as compared to a monotonic loading protocol. The study analysed the load-deformation behaviour and ultimate load carrying capacity while additional information is collected through visual observation on the failure and cracking pattern. The study concluded that the reverse loading negatively influenced the load carrying capacity, but negligibly affected the overall behaviour of the joint.
2.
Bobby Rio Indriyantho; Aylie Han; Purwanto Purwanto; Nuroji Nuroji; Banu Ardi Hidayat; Buntara Sthenly Gan; Chairul Umam
The Strain Energy Dissipation Behavior of Concrete Tension by Composite Action Journal Article
In: International Journal on Engineering Application (IREA), vol. 11, no. 4, 2023.
@article{nokey,
title = {The Strain Energy Dissipation Behavior of Concrete Tension by Composite Action},
author = {Bobby Rio Indriyantho and Aylie Han and Purwanto Purwanto and Nuroji Nuroji and Banu Ardi Hidayat and Buntara Sthenly Gan and Chairul Umam},
doi = {10.15866/irea.v11i4.23767},
year = {2023},
date = {2023-07-21},
journal = {International Journal on Engineering Application (IREA)},
volume = {11},
number = {4},
abstract = {The concrete tensile deformation energy dissipation is of major interest for reinforced concrete uncracked section design. Extensive research, numerical and experimental, is dedicated on the concrete tension stiffening and its cracking behavior, but limited studies center on the deformation energy dissipation. A steel bar embedded in a cylindrical concrete specimen has been subjected to an axial tensile load, and the load-displacement responses recorded. A variation in concrete compression strength ranging from 32 MPa to 47 MPa has been observed. The focus of this study has been to analyze and formulate the deformation energy dissipation behavior as a function of concrete compression strength and reinforcement ratio. The experimental data have showed that the relationship followed a nonlinear ascending path with a bifurcation point, after which the curve’s gradient has gradually declined. A 3D finite element model has been constructed and validated to the experimental data. The model has been developed to generate the influence of a broad range of reinforcement ratios. An equation for predicting the tensile deformation energy dissipation has been proposed based on experimental and numerical data. The equation is valid for reinforcement ratios ranging from 0.001 to 0.1 and a compression strength of 47 MPa. The equation can be utilized for section optimization purposes. },
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The concrete tensile deformation energy dissipation is of major interest for reinforced concrete uncracked section design. Extensive research, numerical and experimental, is dedicated on the concrete tension stiffening and its cracking behavior, but limited studies center on the deformation energy dissipation. A steel bar embedded in a cylindrical concrete specimen has been subjected to an axial tensile load, and the load-displacement responses recorded. A variation in concrete compression strength ranging from 32 MPa to 47 MPa has been observed. The focus of this study has been to analyze and formulate the deformation energy dissipation behavior as a function of concrete compression strength and reinforcement ratio. The experimental data have showed that the relationship followed a nonlinear ascending path with a bifurcation point, after which the curve’s gradient has gradually declined. A 3D finite element model has been constructed and validated to the experimental data. The model has been developed to generate the influence of a broad range of reinforcement ratios. An equation for predicting the tensile deformation energy dissipation has been proposed based on experimental and numerical data. The equation is valid for reinforcement ratios ranging from 0.001 to 0.1 and a compression strength of 47 MPa. The equation can be utilized for section optimization purposes.
3.
Bagus Hario Setiadji; M. Agung Wibowo; H.M. Jonkers; M. Ottele; Mochammad Qomaruddin; Felix Hariyanto Sugianto; Han Ay Lie
Pyrolysis of Reclaimed Asphalt Aggregates in Mortar Journal Article
In: 2023, ISSN: 2086-9614.
@article{nokey,
title = { Pyrolysis of Reclaimed Asphalt Aggregates in Mortar},
author = {Bagus Hario Setiadji and M. Agung Wibowo and H.M. Jonkers and M. Ottele and Mochammad Qomaruddin and Felix Hariyanto Sugianto and Han Ay Lie
},
url = {https://repository.tudelft.nl/islandora/object/uuid%3Aa9d1b41c-626b-4e64-bcab-41627a2f82e1},
doi = {10.14716/ijtech.v13i4.5621},
issn = {2086-9614},
year = {2023},
date = {2023-07-01},
abstract = {Asphalt pavement consists of aggregates resulting in a waste material at end of its life. The aggregates can be reused as basic material for asphalt or cementitious binding agents. In both scenarios, the recycled aggregates should provide a good bond with the binder to achieve strength. This study focuses on reusing recycled asphalt aggregates (RAA) in mortar. The major weakness of RAA is the thin oily film originating from the asphalt residue, weakening the bond with cement. The pyrolysis method is accessed in an attempt to overcome this weakness. Three scenarios were investigated; the use of virgin aggregates (VA), RAA, and pyrolysis recycled asphalt aggregate (PRAA) as constituent in mortar. All variables were set a constant except for the aggregate type, the VA mortar function as controlling element. This research is methodologically based on experimental data conducted in the laboratory, while aggregate samples were taken from the field. To analyze the influence of pyrolysis to the aggregate-to-cement bond behaviour, qualitative and quantitative data were collected. The quantitative data were the mechanical properties, the mortar tensile, and compression strength. The qualitative data were obtained from scanning electron microscope readings to visually observe the aggregate surface roughness and voids, including the aggregates cross-section and pre-existing micro-cracks in the aggregate-to-cement interface. Supporting data were the aggregates‘ abrasion rate and absorption. The RAA resulted in a significant mortar strength decrease. This conclusion was supported by the findings of pre-existing cracks in the interfacial transition zone. The pyrolysis method improved the compression strength but negligibly affected the tensile behavior. The compression and tensile strength increased as a function of time for both RAA and PRAA, and a strength convergence was reached at 28 days. The PRAA is considered an option for reuse in mortar, supporting nature conservation.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Asphalt pavement consists of aggregates resulting in a waste material at end of its life. The aggregates can be reused as basic material for asphalt or cementitious binding agents. In both scenarios, the recycled aggregates should provide a good bond with the binder to achieve strength. This study focuses on reusing recycled asphalt aggregates (RAA) in mortar. The major weakness of RAA is the thin oily film originating from the asphalt residue, weakening the bond with cement. The pyrolysis method is accessed in an attempt to overcome this weakness. Three scenarios were investigated; the use of virgin aggregates (VA), RAA, and pyrolysis recycled asphalt aggregate (PRAA) as constituent in mortar. All variables were set a constant except for the aggregate type, the VA mortar function as controlling element. This research is methodologically based on experimental data conducted in the laboratory, while aggregate samples were taken from the field. To analyze the influence of pyrolysis to the aggregate-to-cement bond behaviour, qualitative and quantitative data were collected. The quantitative data were the mechanical properties, the mortar tensile, and compression strength. The qualitative data were obtained from scanning electron microscope readings to visually observe the aggregate surface roughness and voids, including the aggregates cross-section and pre-existing micro-cracks in the aggregate-to-cement interface. Supporting data were the aggregates‘ abrasion rate and absorption. The RAA resulted in a significant mortar strength decrease. This conclusion was supported by the findings of pre-existing cracks in the interfacial transition zone. The pyrolysis method improved the compression strength but negligibly affected the tensile behavior. The compression and tensile strength increased as a function of time for both RAA and PRAA, and a strength convergence was reached at 28 days. The PRAA is considered an option for reuse in mortar, supporting nature conservation.
4.
Yanuar Haryanto; Ay Lie Han; Hsuan-Teh Hu; Fu-Pei Hsiao; Buntara Sthenly Gan; Laurencius Nugroho; Chia-Chen Lin
In: Proceedings of the Thirty-third (2023) International Ocean and Polar Engineering Conference, 2023, ISSN: 1098-6189.
@article{nokey,
title = {Impact of Non-Reversed Low Cyclic Loading on the Seismic Response of RC T-Beams Strengthened in the Hogging Zone Using NSM-CFRP Rods with Different Embedment Depth},
author = {Yanuar Haryanto and Ay Lie Han and Hsuan-Teh Hu and Fu-Pei Hsiao and Buntara Sthenly Gan and Laurencius Nugroho and Chia-Chen Lin},
url = {https://onepetro.org/ISOPEIOPEC/proceedings-abstract/ISOPE23/All-ISOPE23/ISOPE-I-23-457/524355?redirectedFrom=PDF},
issn = {1098-6189},
year = {2023},
date = {2023-06-19},
journal = {Proceedings of the Thirty-third (2023) International Ocean and Polar Engineering Conference},
abstract = {It is crucial to preserve the serviceability of offshore structures due to the rise in their numbers. These structures include offshore airports, fortifications, offshore wind power, island reefs, sea light-houses, radar stations, as well as civil and military terminals. Therefore, the initial goal of this study is to present an exploratory campaign on the flexural failure behavior of reinforced concrete (RC) T-beams strengthened in the hogging zone with the near-surface mounted (NSM) technique utilizing carbon fiber-reinforced polymer (CFRP) rods under non-reversed cyclic loading, and second, to determine the impact of the rods’ depth of embedment on the specimens’ overall seismic properties. Additionally, two series of geometrically similar RC T-beams consisting of two strengthened specimens having CFRP rods embedded to various depths as well as an un-strengthened specimen were experimentally tested. The results show that the presence of strengthening materials in the hogging zone influences the flexural failure of the RC T-beams, which experience non-reversed low cyclic loading. In particular, the hysteretic behavior, stiffness deterioration, ductility, and failure modes, as well as the beams’ energy dissipation capacity resulting from the embedment depth of the CFRP rods, were evaluated specifically and in-depth.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
It is crucial to preserve the serviceability of offshore structures due to the rise in their numbers. These structures include offshore airports, fortifications, offshore wind power, island reefs, sea light-houses, radar stations, as well as civil and military terminals. Therefore, the initial goal of this study is to present an exploratory campaign on the flexural failure behavior of reinforced concrete (RC) T-beams strengthened in the hogging zone with the near-surface mounted (NSM) technique utilizing carbon fiber-reinforced polymer (CFRP) rods under non-reversed cyclic loading, and second, to determine the impact of the rods’ depth of embedment on the specimens’ overall seismic properties. Additionally, two series of geometrically similar RC T-beams consisting of two strengthened specimens having CFRP rods embedded to various depths as well as an un-strengthened specimen were experimentally tested. The results show that the presence of strengthening materials in the hogging zone influences the flexural failure of the RC T-beams, which experience non-reversed low cyclic loading. In particular, the hysteretic behavior, stiffness deterioration, ductility, and failure modes, as well as the beams’ energy dissipation capacity resulting from the embedment depth of the CFRP rods, were evaluated specifically and in-depth.
5.
Purwanto Purwanto; Januarti Jaya Ekaputri; Nuroji Nuroji; Bobby Rio Indriyantho; Buntara Sthenly Gan; Ay Lie Han
Geopolymer Haunch Beam‒Column Connection Behavior Journal Article
In: Arabian Journal for Science and Engineering, 2023.
@article{nokey,
title = {Geopolymer Haunch Beam‒Column Connection Behavior},
author = {Purwanto Purwanto and Januarti Jaya Ekaputri and Nuroji Nuroji and Bobby Rio Indriyantho and Buntara Sthenly Gan and Ay Lie Han},
url = {https://link.springer.com/article/10.1007/s13369-023-07921-7},
doi = {10.1007/s13369-023-07921-7},
year = {2023},
date = {2023-05-27},
urldate = {2023-05-27},
journal = {Arabian Journal for Science and Engineering},
abstract = {A haunch system improves the performance of a beam-to-column structure, in combination with a geopolymer haunch, the green-concrete concept is supported by reducing the Portland cement use. The energy dissipation, load‒deformation behavior, failure mode, residual deformation, and plastic hinge formation under a loading‒unloading scheme were studied based on experimental full-scale specimens. The responses of the loading‒unloading protocol were compared to the monotonic loading results. A geopolymer and conventional concrete haunch having similar compressive strengths were analyzed. It was shown that the geopolymer haunch performed excellently and that a concrete haunch remarkably improves the performance of a structure regardless of the haunch material. The geopolymer haunch enhanced the load level at first cracking for 10%, and the formation of plastic hinges 0.7% and 4.5% for the monotonic and loading–unloading, respectively, but slightly reduced the ultimate load by 1%. The loading‒unloading protocol had a negative impact of 3% to 7% on the overall performance, the reduction was lower for the geopolymer haunch underlining the superiority of this material. The loading–unloading scheme resulted in a monotonic strength degradation and deviation in failure mode. A finite element model was constructed to generate and analyze the relation of the haunch’s concrete strength to the load‒deformation response. It was found that the haunch’s compressive strength had no influence on the behavior of the beam-to-column joint, even for a haunch with a compressive strength as low as 25 MPa. },
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A haunch system improves the performance of a beam-to-column structure, in combination with a geopolymer haunch, the green-concrete concept is supported by reducing the Portland cement use. The energy dissipation, load‒deformation behavior, failure mode, residual deformation, and plastic hinge formation under a loading‒unloading scheme were studied based on experimental full-scale specimens. The responses of the loading‒unloading protocol were compared to the monotonic loading results. A geopolymer and conventional concrete haunch having similar compressive strengths were analyzed. It was shown that the geopolymer haunch performed excellently and that a concrete haunch remarkably improves the performance of a structure regardless of the haunch material. The geopolymer haunch enhanced the load level at first cracking for 10%, and the formation of plastic hinges 0.7% and 4.5% for the monotonic and loading–unloading, respectively, but slightly reduced the ultimate load by 1%. The loading‒unloading protocol had a negative impact of 3% to 7% on the overall performance, the reduction was lower for the geopolymer haunch underlining the superiority of this material. The loading–unloading scheme resulted in a monotonic strength degradation and deviation in failure mode. A finite element model was constructed to generate and analyze the relation of the haunch’s concrete strength to the load‒deformation response. It was found that the haunch’s compressive strength had no influence on the behavior of the beam-to-column joint, even for a haunch with a compressive strength as low as 25 MPa.
6.
Laurencius Nugroho; Fu-Pei Hsiao; Hsuan-Teh Hu; Ay Lie Han; Yanuar Haryanto; Gathot Heri Sudibyo; Banu Ardi Hidayat
Residual strength of normal concrete reinforced with aluminum fiber at elevated temperatures Journal Article
In: THE 3RD INTERNATIONAL CONFERENCE ON ENGINEERING, TECHNOLOGY AND INNOVATIVE RESEARCHES, vol. 2482, iss. 1, 2023.
@article{nokey,
title = {Residual strength of normal concrete reinforced with aluminum fiber at elevated temperatures},
author = {Laurencius Nugroho and Fu-Pei Hsiao and Hsuan-Teh Hu and Ay Lie Han and Yanuar Haryanto and Gathot Heri Sudibyo and Banu Ardi Hidayat},
url = {https://pubs.aip.org/aip/acp/article/2482/1/050004/2867340/Residual-strength-of-normal-concrete-reinforced},
doi = {10.1063/5.0110869},
year = {2023},
date = {2023-02-21},
urldate = {2023-02-21},
journal = {THE 3RD INTERNATIONAL CONFERENCE ON ENGINEERING, TECHNOLOGY AND INNOVATIVE RESEARCHES},
volume = {2482},
issue = {1},
abstract = {Civil construction faces an immense challenge due to the damages caused by fire during the construction and service phases. Therefore, it is important to study fire being one of the most severe environmental conditions affecting structures in order to mitigate its effects. Moreover, fiber has been generally discovered to be effective as a reinforced material to improve the strength of concretes. This research was conducted to analyze the residual strength of concretes reinforced with aluminum fibers when exposed to high temperatures. This involved the preparation of 25 MPa concrete specimens with the addition of 0.2% fiber contents exposed to 400 °C and 800 °C temperature for 30 minutes after which their compressive and split cylinder strengths were measured. The result showed the fiber increased the compressive strength by 14.37%, 14.90%, and 2.00%, and the split cylinder strength by 47.27%, 44.29%, and 32.09% at 25°C, 400°C, and 800°C respectively in comparison with the normal concrete.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Civil construction faces an immense challenge due to the damages caused by fire during the construction and service phases. Therefore, it is important to study fire being one of the most severe environmental conditions affecting structures in order to mitigate its effects. Moreover, fiber has been generally discovered to be effective as a reinforced material to improve the strength of concretes. This research was conducted to analyze the residual strength of concretes reinforced with aluminum fibers when exposed to high temperatures. This involved the preparation of 25 MPa concrete specimens with the addition of 0.2% fiber contents exposed to 400 °C and 800 °C temperature for 30 minutes after which their compressive and split cylinder strengths were measured. The result showed the fiber increased the compressive strength by 14.37%, 14.90%, and 2.00%, and the split cylinder strength by 47.27%, 44.29%, and 32.09% at 25°C, 400°C, and 800°C respectively in comparison with the normal concrete.
7.
Yanuar Haryanto; Fu-Pei Hsiao; Hsuan-Teh Hu; Ay Lie Han; Banu Ardi Hidayat; Laurencius Nugroho
In: THE 3RD INTERNATIONAL CONFERENCE ON ENGINEERING, TECHNOLOGY AND INNOVATIVE RESEARCHES, vol. 2482, iss. 1, 2023.
@article{nokey,
title = {Validating an analytical method to predict flexural behavior of RC T-beams retrofitted with bonded steel wire ropes in the negative moment region},
author = {Yanuar Haryanto and Fu-Pei Hsiao and Hsuan-Teh Hu and Ay Lie Han and Banu Ardi Hidayat and Laurencius Nugroho},
url = {https://pubs.aip.org/aip/acp/article/2482/1/030001/2867293/Validating-an-analytical-method-to-predict},
doi = {10.1063/5.0113554},
year = {2023},
date = {2023-02-21},
journal = {THE 3RD INTERNATIONAL CONFERENCE ON ENGINEERING, TECHNOLOGY AND INNOVATIVE RESEARCHES},
volume = {2482},
issue = {1},
abstract = {In this day and age, a rewarding and new structural strengthening technique for civil structures is steel wire rope (SWR) strengthening. The ideal technique for structural analysis is the finite element method. Nonetheless, it could be an expensive and a challenging task to develop a model through the finite element method for a simple problem, for instance, cross section analysis of reinforced concrete (RC) structures. Therefore, in order to predict the flexural behavior of T-section RC beams, strengthened in the negative moment region with bonded steel wire ropes, researchers performed an analytical validation through a program based on the modified compression field theory (MCFT), namely Response-2000. They chose experimental data from the test conducted on three T-section RC beams in 2012. Subsequently, the collected results were compared with calculations from the fiber-elements method, constructed in excel spread sheets. Reasonably precise calculations of load-deflection responses, up to the peak load, were offered by the developed analytical model, however, the ductility of the beams was underestimated. The validated model was then utilized to study the impact of SWR diameter on the behavior of strengthened beams. This analytical investigation reveals the effectiveness of SWR bonded systems as an alternative strengthening technique, with the aim of enhancing the flexural capacity of RC beams.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In this day and age, a rewarding and new structural strengthening technique for civil structures is steel wire rope (SWR) strengthening. The ideal technique for structural analysis is the finite element method. Nonetheless, it could be an expensive and a challenging task to develop a model through the finite element method for a simple problem, for instance, cross section analysis of reinforced concrete (RC) structures. Therefore, in order to predict the flexural behavior of T-section RC beams, strengthened in the negative moment region with bonded steel wire ropes, researchers performed an analytical validation through a program based on the modified compression field theory (MCFT), namely Response-2000. They chose experimental data from the test conducted on three T-section RC beams in 2012. Subsequently, the collected results were compared with calculations from the fiber-elements method, constructed in excel spread sheets. Reasonably precise calculations of load-deflection responses, up to the peak load, were offered by the developed analytical model, however, the ductility of the beams was underestimated. The validated model was then utilized to study the impact of SWR diameter on the behavior of strengthened beams. This analytical investigation reveals the effectiveness of SWR bonded systems as an alternative strengthening technique, with the aim of enhancing the flexural capacity of RC beams.
8.
Banu Ardi Hidayat; Hsuan-Teh Hu; Fu-Pei Hsiao; Ay Lie Han; Yanuar Haryanto; Laurencius Nugroho
Flexural behavior of artificial lightweight aggregate concrete reinforced by carpet waste fiber Journal Article
In: THE 3RD INTERNATIONAL CONFERENCE ON ENGINEERING, TECHNOLOGY AND INNOVATIVE RESEARCHES, vol. 2482, iss. 1, 2023.
@article{nokey,
title = {Flexural behavior of artificial lightweight aggregate concrete reinforced by carpet waste fiber},
author = {Banu Ardi Hidayat and Hsuan-Teh Hu and Fu-Pei Hsiao and Ay Lie Han and Yanuar Haryanto and Laurencius Nugroho},
url = {https://pubs.aip.org/aip/acp/article/2482/1/050008/2867248/Flexural-behavior-of-artificial-lightweight},
doi = {10.1063/5.0110752},
year = {2023},
date = {2023-02-21},
journal = {THE 3RD INTERNATIONAL CONFERENCE ON ENGINEERING, TECHNOLOGY AND INNOVATIVE RESEARCHES},
volume = {2482},
issue = {1},
abstract = {Artificial lightweight aggregate (ALWA) can be used as a replacement for coarse aggregates to produce low-density lightweight concrete. It can reduce the total weight of structural members, and consequently, the seismic forces on the building can be minimized. When adding a certain amount of fibers to the concrete mixture, the concrete performance can be improved by enhancing bonding between the mortar matrix and aggregates. To find more robust results, the study of combining the ALWA and fibers needs to be investigated. This paper deals with the impact of carpet fiber on flexural strength and failure mode of ALWA concrete. The experimental work was conducted on 150x150x600 mm concrete beams with ALWA aggregates and a 0 to 1% carpet fiber fraction range. The test results show that the optimum flexural strength of the beam improves by 7.15% with a 0.47% carpet fiber addition. In contrast, the specimen's failure mode indicates that it does not happen suddenly, with the deflection quality experiencing a reduction of 24.32% due to the presence of fibers. The results offer valuable information on the progress of lightweight concrete and fiber concrete research, also will contribute to the future research of the ALWA concrete strengthened with fibers.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Artificial lightweight aggregate (ALWA) can be used as a replacement for coarse aggregates to produce low-density lightweight concrete. It can reduce the total weight of structural members, and consequently, the seismic forces on the building can be minimized. When adding a certain amount of fibers to the concrete mixture, the concrete performance can be improved by enhancing bonding between the mortar matrix and aggregates. To find more robust results, the study of combining the ALWA and fibers needs to be investigated. This paper deals with the impact of carpet fiber on flexural strength and failure mode of ALWA concrete. The experimental work was conducted on 150x150x600 mm concrete beams with ALWA aggregates and a 0 to 1% carpet fiber fraction range. The test results show that the optimum flexural strength of the beam improves by 7.15% with a 0.47% carpet fiber addition. In contrast, the specimen's failure mode indicates that it does not happen suddenly, with the deflection quality experiencing a reduction of 24.32% due to the presence of fibers. The results offer valuable information on the progress of lightweight concrete and fiber concrete research, also will contribute to the future research of the ALWA concrete strengthened with fibers.
9.
Yanuar Haryanto; Fu-Pei Hsiao; Hsuan-Teh Hu; Ay Lie Han; Andre Wiranata Chu; Fernando Salim; Laurencius Nugroho
Structural behavior of negative moment region NSM-CFRP strengthened RC T-beams with various embedment depth under monotonic and cyclic loading Journal Article
In: Composite Structures, vol. 301, 2022, ISSN: 0263-8223.
@article{nokey,
title = {Structural behavior of negative moment region NSM-CFRP strengthened RC T-beams with various embedment depth under monotonic and cyclic loading},
author = {Yanuar Haryanto and Fu-Pei Hsiao and Hsuan-Teh Hu and Ay Lie Han and Andre Wiranata Chu and Fernando Salim and Laurencius Nugroho},
url = {https://www.sciencedirect.com/science/article/abs/pii/S0263822322009461?via%3Dihub},
doi = {https://doi.org/10.1016/j.compstruct.2022.116214},
issn = {0263-8223},
year = {2022},
date = {2022-12-01},
journal = {Composite Structures},
volume = {301},
abstract = {Under cyclic loading circumstances, reinforced concrete (RC) constructions may be subject to failure. Because they may indicate inadequate capacity owing to aging, environmental effects, or unintentional impacts, strengthening is critical to resist static and cyclic loads. Therefore, the goal of this research was to look at how bare and negative moment region strengthened RC T-beams behaved under monotonic and low reversed cyclic loads. As the strengthening system, carbon fiber reinforced polymer (CFRP) rods having different embedment depths were used with a near-surface mounted (NSM) approach. The findings of this study demonstrated that the impact of NSM-CFRP rods was sufficient for extending the ultimate load and capturing cracks under monotonic loading. Additionally, as compared to their bare counterparts, the negative moment region NSM-CFRP strengthened beams showed improved hysteresis behavior, a larger energy dissipation capacity together with initial stiffness, and a reduced damage index under cyclic loading. Moreover, the experimentally determined load-carrying capacities matched reasonably well with the theoretical predictions.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Under cyclic loading circumstances, reinforced concrete (RC) constructions may be subject to failure. Because they may indicate inadequate capacity owing to aging, environmental effects, or unintentional impacts, strengthening is critical to resist static and cyclic loads. Therefore, the goal of this research was to look at how bare and negative moment region strengthened RC T-beams behaved under monotonic and low reversed cyclic loads. As the strengthening system, carbon fiber reinforced polymer (CFRP) rods having different embedment depths were used with a near-surface mounted (NSM) approach. The findings of this study demonstrated that the impact of NSM-CFRP rods was sufficient for extending the ultimate load and capturing cracks under monotonic loading. Additionally, as compared to their bare counterparts, the negative moment region NSM-CFRP strengthened beams showed improved hysteresis behavior, a larger energy dissipation capacity together with initial stiffness, and a reduced damage index under cyclic loading. Moreover, the experimentally determined load-carrying capacities matched reasonably well with the theoretical predictions.
10.
Bagus Hario Setiadji; M Agung Wibowo; Henk M Jonkers; Marc Ottele; Widayat; Mochammad Qomaruddin; Felix Hariyanto Sugianto; Purwanto; Han Ay Lie
Pyrolysis of Reclaimed Asphalt Aggregates in Mortar Journal Article
In: International Journal of Technology (IJTech), vol. 13, no. 4, 2022.
@article{nokey,
title = {Pyrolysis of Reclaimed Asphalt Aggregates in Mortar},
author = {Bagus Hario Setiadji and M Agung Wibowo and Henk M Jonkers and Marc Ottele and Widayat and Mochammad Qomaruddin and Felix Hariyanto Sugianto and Purwanto and Han Ay Lie },
url = {https://ijtech.eng.ui.ac.id/article/view/5621},
doi = {https://doi.org/10.14716/ijtech.v13i4.5621},
year = {2022},
date = {2022-10-07},
journal = {International Journal of Technology (IJTech)},
volume = {13},
number = {4},
abstract = {Asphalt pavement consists of aggregates resulting in a waste material at end of its life. The aggregates can be reused as basic material for asphalt or cementitious binding agents. In both scenarios, the recycled aggregates should provide a good bond with the binder to achieve strength. This study focuses on reusing recycled asphalt aggregates (RAA) in mortar. The major weakness of RAA is the thin oily film originating from the asphalt residue, weakening the bond with cement. The pyrolysis method is accessed in an attempt to overcome this weakness. Three scenarios were investigated; the use of virgin aggregates (VA), RAA, and pyrolysis recycled asphalt aggregate (PRAA) as constituent in mortar. All variables were set a constant except for the aggregate type, the VA mortar function as controlling element. This research is methodologically based on experimental data conducted in the laboratory, while aggregate samples were taken from the field. To analyze the influence of pyrolysis to the aggregate-to-cement bond behaviour, qualitative and quantitative data were collected. The quantitative data were the mechanical properties, the mortar tensile, and compression strength. The qualitative data were obtained from scanning electron microscope readings to visually observe the aggregate surface roughness and voids, including the aggregates cross-section and pre-existing micro-cracks in the aggregate-to-cement interface. Supporting data were the aggregates‘ abrasion rate and absorption. The RAA resulted in a significant mortar strength decrease. This conclusion was supported by the findings of pre-existing cracks in the interfacial transition zone. The pyrolysis method improved the compression strength but negligibly affected the tensile behavior. The compression and tensile strength increased as a function of time for both RAA and PRAA, and a strength convergence was reached at 28 days. The PRAA is considered an option for reuse in mortar, supporting nature conservation.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Asphalt pavement consists of aggregates resulting in a waste material at end of its life. The aggregates can be reused as basic material for asphalt or cementitious binding agents. In both scenarios, the recycled aggregates should provide a good bond with the binder to achieve strength. This study focuses on reusing recycled asphalt aggregates (RAA) in mortar. The major weakness of RAA is the thin oily film originating from the asphalt residue, weakening the bond with cement. The pyrolysis method is accessed in an attempt to overcome this weakness. Three scenarios were investigated; the use of virgin aggregates (VA), RAA, and pyrolysis recycled asphalt aggregate (PRAA) as constituent in mortar. All variables were set a constant except for the aggregate type, the VA mortar function as controlling element. This research is methodologically based on experimental data conducted in the laboratory, while aggregate samples were taken from the field. To analyze the influence of pyrolysis to the aggregate-to-cement bond behaviour, qualitative and quantitative data were collected. The quantitative data were the mechanical properties, the mortar tensile, and compression strength. The qualitative data were obtained from scanning electron microscope readings to visually observe the aggregate surface roughness and voids, including the aggregates cross-section and pre-existing micro-cracks in the aggregate-to-cement interface. Supporting data were the aggregates‘ abrasion rate and absorption. The RAA resulted in a significant mortar strength decrease. This conclusion was supported by the findings of pre-existing cracks in the interfacial transition zone. The pyrolysis method improved the compression strength but negligibly affected the tensile behavior. The compression and tensile strength increased as a function of time for both RAA and PRAA, and a strength convergence was reached at 28 days. The PRAA is considered an option for reuse in mortar, supporting nature conservation.