@article{nokey,

title = {Chemical and Microstructural Changes in Reclaimed Asphalt Pavement Aggregates by Pyrolysis},

author = {Mochammad Qomaruddin and Han Ay Lie and Purwanto and Widayat},

url = {https://link.springer.com/journal/13369},

year  = {2024},

date = {2024-01-25},

urldate = {2024-01-25},

journal = { Arabian Journal for Science and Engineering},

abstract = {The utilization of reclaimed asphalt pavement (RAP) aggregates as an alternative for rigid pavements is limited. The main objective of this study is to explore and improve the utilization of RAP aggregates as an alternative material for rigid pavement. Specifically, this study focuses on addressing a significant challenge associated with RAP aggregates, which is their poor bond with cementitious binders. The poor bonding results in low compressive and tensile strengths of concrete or mortar. The poor bonding is mainly due to the presence of a thin oily layer of asphalt residue. A proposed method was carried out to reduce the negative impact on the bond between the aggregate and mortar by exposing the RAP aggregates to the pyrolysis process. The research focused on the analyses of the physical and chemical behavior of the aggregates, using the SEM, EDX, and FTIR approaches, as well as reviewing the mortar in both compressive and flexural tensile strength. The pyrolysis affected the physical and mechanical properties positively and the chemical composition of the RAP showed significant changes. The chemical constituents of asphalt attached to RAP aggregates are hydrocarbons. The thin layer of RAP asphalt is the cause of weak bonding, but this layer was altered by the pyrolysis procedure. As a result, water absorption decreased, which had a positive impact on the hydraulic synergy of cement. It is shown that the pyrolyzing RAP improves the compressive strength and flexural tensile strength through modification of the asphalt residue covering the aggregates.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {NSM-CFRP rods with varied embedment depths for strengthening RC T-beams in the negative moment region: Investigation on high cyclic response},

author = {Laurencius Nugrohoa and Yanuar Haryanto and Hsuan-Teh Hu and and Ay Lie Han and Fu-Pei Hsiao and Chia-Chen Lin and Pu-Wen Weng and Endah Purwaningsih Widiastuti},

url = {https://www.sciencedirect.com/science/article/abs/pii/S0263822324000199},

doi = {10.1016/j.compstruct.2024.117891},

year  = {2024},

date = {2024-01-06},

journal = {Composite Structures},

volume = {331},

abstract = {Throughout its service life, structural reinforced concrete (RC) encounters cyclic loads and the load amplitude might always vary, leading to a mixed high and low-cycle failure. This research investigates the high cyclic response of RC T-beams strengthened in the negative moment region using near-surface mounted (NSM) Carbon Fiber Reinforced Polymer (CFRP) rods. The distinctive aspect lies in exploring varied embedment depths, including the introduction of half-embedded configurations as an alternative NSM technique. The study comprehensively analyzes load-carrying capacity, failure modes, energy dissipation, ductility, stiffness degradation, and strain behavior, providing insights into the effects of loading rates on structural response. Through an experimental program comparing fully-embedded (BF-D) and half-embedded (BH-D) CFRP rods with a control beam (BN-D) under high-rate cyclic loading, significant increases in ultimate load capacity (21.23% for BH-D and 30.86% for BF-D) are demonstrated despite debonding occurrences. The findings highlight a trade-off between benefits (enhanced ultimate load capacities, improved energy dissipation, and increased stiffness) and drawbacks (reduced ductility and tendencies toward brittle behavior) under high loading rates. Furthermore, a rate-dependent material formula is developed and validated, predicting the flexural strength of the negative moment region in good agreement with experimental results. Finally, this research contributes practical solutions to RC element strengthening challenges and advances understanding of NSM-CFRP-strengthened beam, emphasizing the impact of loading rates on structural response.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Predicting the behavior of RC T-beams strengthened with NSM- CFRP rods in the negative moment region: A finite element approach for low cyclic loading},

author = {Yanuar Haryanto and Nor Intang Setyo Hermanto and Fu-Pei Hsiao and Hsuan-Teh Hu and Ay Lie Han and Laurencius Nugroho and Fernando Salim},

url = {https://www.e3s-conferences.org/articles/e3sconf/abs/2023/101/e3sconf_icdmm2023_06001/e3sconf_icdmm2023_06001.html},

doi = {10.1051/e3sconf/202346406001},

year  = {2023},

date = {2023-12-18},

journal = {The 2nd International Conference on Disaster Mitigation and Management (2nd ICDMM 2023)},

volume = {464},

abstract = {In this study, a finite element (FE) model for nonlinear FE analysis was developed to evaluate the performance of reinforced concrete (RC) T-beams, which were strengthened in the negative moment region by near-surface mounted (NSM) carbon fiber reinforced polymer (CFRP) rods under low cyclic loading. Furthermore, the rods' depth of embedment was the research variable. Every component of the beam is considered in the model, including the concrete, steel rebars, CFRP rod, CFRP sheet, adhesive, and stirrups. The nonlinear properties of concrete, steel rebars, and adhesive were taken into account, while that of the CFRP was assumed to be linearly elastic till rupture. In addition, the user-programmable capabilities of ABAQUS were used to define the degradation of each material under low cyclic loading. The developed FE model was then compared to some experimental measurements comprising two specimens strengthened with NSM-CFRP rods and one un-strengthened control specimen. Overall, the predicted FE mid-span deflection responses were in line with the corresponding measured experimentally tested data. Finally, the research findings were summarized.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Flexural capacity of negative moment region NSM-CFRP strengthened RC T-beam under high loading rate: an analytical prediction},

author = {Laurencius Nugroho and Yanuar Haryanto and Hsuan-Teh Hu and Fu-Pei Hsiao and Ay Lie Han and Arnie Widyaningrum and Hari Prasetijo},

url = {https://www.e3s-conferences.org/articles/e3sconf/abs/2023/101/e3sconf_icdmm2023_06004/e3sconf_icdmm2023_06004.html},

doi = {10.1051/e3sconf/202346406004},

year  = {2023},

date = {2023-12-18},

journal = {The 2nd International Conference on Disaster Mitigation and Management (2nd ICDMM 2023)},

volume = {464},

abstract = {In the design phase of strengthening a reinforced concrete (RC) beam, it is necessary to determine its capacity. Response-2000 software offers efficient analysis for determining the capacity of a beam, including its flexural capacity. The aim of this study is to assess the predictive accuracy of Response-2000 software in determining the flexural capacity of the negative moment region of NSM-FRP strengthened RC T-beams under high loading rates. The validation of the static material model was initially conducted and then several combinations of established empirical formulations were utilized to express the corresponding dynamic properties of relevant materials. The findings of the study suggest that the compressive and tensile strength of concrete have a significant impact on the flexural capacity of the strengthened beams. Furthermore, empirical evidence supports the idea that Response-2000 possesses the capability to effectively predict the flexural capacity, utilizing a rate-dependent material approach.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@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}

}