Article
Construction & Building Technology
Po-Chien Hsiao, Sheng-Chan Chou, Chung-Chan Hung
Summary: A novel bracing method using steel reinforced ultra-high performance concrete (UHPC) was developed to strengthen the seismic behavior of reinforced concrete frames. The method involved the use of precast UHPC braces connected to the frame to simplify the construction process. Experimental tests showed that the UHPC brace effectively enhanced the stiffness, strength, and energy dissipation capacity of the original frame.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Polymer Science
Saeed Jafari, Seyed Saeed Mahini
Summary: This paper investigates the effectiveness of different lengths of Fiber-Reinforced Polymer (FRP) sheets in retrofitting the joints of Reinforced Concrete (RC) frames to improve their fragility function. The study used FE modelling and Incremental Dynamic Analysis to evaluate the performance of two different retrofitting methods. The results showed that longer sheets of FRP significantly improved the fragility capacity of the retrofitted frames. Carbon Fiber-Reinforced Polymer (CFRP) and Glass Fiber-Reinforced Polymer (GFRP) materials were found to enhance the probability of exceedance, with the improvement being more significant for shorter sheets. Overall, the study highlights the importance of FRP retrofitting in enhancing the seismic performance of RC frames.
Article
Engineering, Civil
Jamshid Esmaeili, Seyed Pouya Khoshkanabi, Keyvan Andalibi, Jamil Kasaei
Summary: In this paper, a novel strengthening method for reinforced concrete structures by using prefabricated textile-reinforced concrete composites was developed. The flexural behavior of RC beams retrofitted with prefabricated basalt textile reinforced concrete panels was examined in an experimental study. The results showed that the prefabricated BTRC strengthening method was more effective in improving the loading carrying capacity of reinforced RC beams compared to cast-in-place strengthening.
Article
Construction & Building Technology
Chung-Chan Hung, Hsin-Jui Hsiao, Yi Shao, Cheng-Hao Yen
Summary: This study proposes a new retrofitting method for reinforced concrete beam-column joints in old buildings, using high-strength steel bar mesh and Engineering Cementitious Composite (ECC). The method reduces the required size of the retrofitting jacket by combining ECC jackets and high-strength steel bar mesh. Experimental testing showed that ECC jackets with high-strength steel mesh effectively improved the strength, stiffness retention, energy dissipation capacity, deformation capacity, and collapse drift of the retrofitted beam-column joints compared to concrete jackets and fiber-reinforced-polymer (FRP) jackets.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Engineering, Civil
Maryam Jalaeian Zaferani, Hashem Shariatmadar
Summary: This study investigates the repair and retrofitting of external RC beam-to-column joints using FRP composites through experimental tests. The results show that the proposed hybrid retrofitting methods can restore and even enhance the load-carrying capacity of the joints to levels higher than the seismic control specimen.
ENGINEERING STRUCTURES
(2022)
Article
Engineering, Civil
Jun Yang, Rui Chen, Zhongya Zhang, Yang Zou, Jianting Zhou, Junrun Xia
Summary: This paper presents an experimental investigation on the behavior of damaged RC arches strengthened with ultra-high-performance concrete (UHPC). The results indicate that the use of UHPC can effectively enhance the initial crack load and ultimate bearing capacity of composite arches. The stiffness and ductility of the composite arches are also improved. Furthermore, no obvious cracking and separation phenomena are observed in the interface of UHPC strengthened arches during eccentric loading.
ENGINEERING STRUCTURES
(2023)
Review
Engineering, Civil
Xiangsheng Liu, Georgia E. Thermou
Summary: This paper reviews the performance of shear strengthened reinforced concrete beams using externally bonded mortar-based composite jackets, evaluating the accuracy of existing design models in predicting shear strength contribution.
Article
Construction & Building Technology
Mahmoud Elsayed, Mohamed Abou Elmaaty, Reem Mohamed
Summary: This study aimed to investigate the effectiveness of using steel fiber-reinforced self-compacting concrete (SFRSCC) jackets in retrofitting RC columns exposed to high temperatures. Eleven RC columns were cast and tested under axial loading, with one serving as a control and ten heated to 400°C and 600°C for two hours. Eight columns were retrofitted using SFRSCC jackets, with the volume fraction of steel fibers and jacket thickness as the main parameters. The findings showed that SFRSCC jackets significantly improved the structural performance of post-heated columns, including failure load, stiffness, and toughness.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Cheng Wu, Hyeon-Jong Hwang, Gao Ma
Summary: This study evaluated the effect of retrofitting with CFRP or UHPC on the bar bond strength by conducting lap-splice tests on 20 beam specimens. The results showed that the bar bond strength was improved by retrofitting with a combination of CFRP sheet and UHPC.
ACI STRUCTURAL JOURNAL
(2023)
Article
Polymer Science
Aditya Kumar Tiwary, Sandeep Singh, Raman Kumar, Kamal Sharma, Jasgurpreet Singh Chohan, Shubham Sharma, Jujhar Singh, Jatinder Kumar, Ahmed Farouk Deifalla
Summary: Lateral reinforcement is crucial for the strength and ductility of concrete. This study investigated the use of carbon fiber reinforced polymer (CFRP) sheets wrapped around reinforced concrete (RC) beams to provide additional confinement. Through experimental testing, it was found that flexural retrofitting of damaged beams with CFRP sheets was functionally effective, with restored strength and stiffness values equal to or greater than those of the control beam. The efficiency of the retrofitting mechanism varied depending on the layout of the CFRP sheets, with steel rupture and concrete crushing being the most common failure modes.
Article
Mechanics
M. Arsalan Khan
Summary: This study investigates the critical problem of interfacial debonding in beams externally strengthened by sticking plates, focusing on the combined effects of temperature dependent parameters and thermo-mechanical loads. The proposed analytical solutions introduce temperature effects within the interfacial adhesive to relate the glass-transition point of adhesive with composite action. Validation through experiments and numerical models leads to parametric investigations and key observations on temperature effects.
COMPOSITE STRUCTURES
(2021)
Article
Polymer Science
Justas Slaitas, Remigijus Salna, Juozas Valivonis
Summary: In recent years, carbon fibre reinforced polymer (CFRP) laminates have become popular in the structural rehabilitation market due to their easy and quick installation, high strength, and anticorrosion properties. However, the partially rigid glued laminate joint can result in slippage and premature debonding. This article discusses the anchoring issues of CFRP laminates and provides guidelines for developing anchoring systems.
Article
Engineering, Civil
Abdullah Al-Saidy, Sherif El-Gamal, Kazi Abu Sohail
Summary: This study investigated the effectiveness of different types of mortars in strengthening reinforced concrete beams with textile bonding. The results showed that epoxy-bonded textile performed better in terms of strength enhancement, while mortar-bonded textile showed better ductility. Increasing the number of layers had no significant impact on strength, but using U-shaped strips along with the textile layers improved flexure strength and ductility.
INTERNATIONAL JOURNAL OF CIVIL ENGINEERING
(2023)
Article
Construction & Building Technology
Alireza Ezoddin, Ali Kheyroddin, Majid Gholhaki
Summary: The study investigates the retrofitted RC frames with the LCF system, showing that the frames designed according to the proposed equations exhibit good stiffness, high ductility, and significant energy dissipation. The results also demonstrate an increase in ductility factor, average elastic stiffness, and system bearing capacity when using the proposed equations for the LC frame sections. Additionally, the retrofitted RC frames based on the proposed equations are more capable of resisting earthquake forces without damaging the main frame members.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Engineering, Civil
Jianhe Xie, Jianglin Li, Zhongyu Lu, Di Liu, Peiyan Huang
Summary: This study assessed the effects of existing damage in RC beams before strengthening and overloading after strengthening on the reliability of prestressed CFRP plate strengthening system. The experimental results showed that corrosion- and cyclic overload-induced damage significantly reduced the flexural stiffness of strengthened RC beams but did not greatly impact the ultimate load, indicating the effectiveness of the strengthening system. After exposure to cyclic overloading, the strengthened RC beams had an ultimate load retention of over 80% and exhibited a similar failure mode of concrete crushing. The proposed model accurately predicted the ultimate load of strengthened RC beams after exposure to low-cycle overload.
ENGINEERING STRUCTURES
(2021)
Article
Mechanics
Jianxiang Wang, Liyong Tong, Bhushan L. Karihaloo
ARCHIVE OF APPLIED MECHANICS
(2016)
Article
Construction & Building Technology
M. S. Abo Dhaheer, S. Kulasegaram, B. L. Karihaloo
CEMENT AND CONCRETE RESEARCH
(2016)
Article
Construction & Building Technology
W. S. Alyhya, M. S. Abo Dhaheer, M. M. Al-Rubaye, B. L. Karihaloo
CONSTRUCTION AND BUILDING MATERIALS
(2016)
Article
Engineering, Mechanical
H. Dong, Z. Li, J. Wang, B. L. Karihaloo
INTERNATIONAL JOURNAL OF FATIGUE
(2016)
Article
Construction & Building Technology
B. S. Al-Azzawi, B. L. Karihaloo
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2017)
Article
Construction & Building Technology
Muna AL-Rubaye, Sivakumar Kulasegaram, Bhushan Lal Karihaloo
MAGAZINE OF CONCRETE RESEARCH
(2017)
Article
Engineering, Multidisciplinary
B. S. Al-Azzawi, B. L. Karihaloo
SADHANA-ACADEMY PROCEEDINGS IN ENGINEERING SCIENCES
(2017)
Article
Engineering, Mechanical
A. Ramachandra Murthy, B. L. Karihaloo, P. Vindhya Rani, D. Shanmuga Priya
INTERNATIONAL JOURNAL OF FATIGUE
(2018)
Article
Materials Science, Multidisciplinary
Linjuan Wang, Jifeng Xu, Jianxiang Wang, Bhushan L. Karihaloo
MECHANICS OF MATERIALS
(2019)
Article
Engineering, Multidisciplinary
B. S. Al-Azzawi, B. L. Karihaloo
SADHANA-ACADEMY PROCEEDINGS IN ENGINEERING SCIENCES
(2018)
Article
Engineering, Mechanical
Linjuan Wang, Jifeng Xu, Jianxiang Wang, Bhushan L. Karihaloo
ACTA MECHANICA SINICA
(2020)
Article
Mechanics
B. L. Karihaloo, Q. Z. Xiao
PHYSICAL MESOMECHANICS
(2019)
Article
Engineering, Civil
Hector Cifuentes, Bhushan L. Karihaloo
Article
Construction & Building Technology
W. S. Alyhya, S. Kulasegaram, B. L. Karihaloo
CEMENT AND CONCRETE RESEARCH
(2017)
Article
Construction & Building Technology
Qi Jiang, Wei Liu, Shaopeng Wu, Xuanwen Gou
Summary: This study analyzes the erosion mechanisms of NaCl solution on asphalt concrete and finds that NaCl solution softens asphalt and promotes the intrusion of crystalline salt into it. Salt crystallization alters the surface roughness of aggregates, resulting in a decrease in skid resistance but an improvement in compressive strength. Additionally, the concentration of NaCl solution initially has no significant impact on the mechanical performance of asphalt concrete, but its domination gradually increases with the intensification of cyclic effects.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Lili Kan, Lan-qing Dai, Ning Kong, Bin Peng, Fei Wang
Summary: This paper investigates the effect of freezing and thawing cycles on the tensile behavior of cracked ultra-high performance concrete (UHPC). The results show that long-term freezing and thawing action deteriorates the cracking strength, tensile strength, tensile strain, and strain energy of cracked UHPC. On the other hand, the action of water generally favors the development of tensile properties of UHPC. The crack distribution tends to be unsaturated under freezing and thawing environment, and the re-hydration reaction is hindered. The pore structure near the crack varies under different environments.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Xin Xiao, Jingwei Li, Qingke Meng, Xiangshan Hou, Yanhui Liu, Xujiang Wang, Wenlong Wang, Shengtao Lu, Yuzhong Li, Yanpeng Mao, Tong Li
Summary: Preparing gypsum-based self-leveling mortar (GSLM) using beta-hemihydrate gypsum and solid wastes-derived sulfoaluminate cement (WSAC) can improve the mechanical performance of the mortar, but phosphorus impurities can weaken the hydration speed and degree.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Sihang Bao, Junzhen Di, Yanrong Dong, Ziqing Gao, Qing Gu, Yuanfang Zhao, Hongyu Zhai
Summary: Tailings dam break and leakage accidents pose a threat to the safety of people in mining areas and cause severe environmental pollution. This study focuses on solidifying tailing sand using microbial induced calcite precipitation (MICP) to improve strength and fix heavy metals. The curing time of MICP bio-cemented tailings is found to significantly impact the strength of tailings, while its effect on heavy metal fixation is minimal. The optimized MICP curing time is 10 days, resulting in improved strength and cementation of tailings particles.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Ferhat Benmahiddine, Fares Bennai, Achraf Charaka, Ameur El Amine Hamami, Abdelkader Tahakourt, Rafik Belarbi
Summary: This paper studied the effects of hysteresis on the hygrothermal behavior at the building scale. Through laboratory validation and numerical simulations, it was found that hysteresis has a significant impact on the relative humidity and total heat fluxes in buildings, while it does not have a noticeable effect on temperature variations.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
You Gao, Wei He, Xiayang Zhang, De'an Sun, Pei Li
Summary: This study determined the boundary line between the swelling and compression deformation zone in lateritic clay through wetting tests, and proposed a simple bimodal SWRC model. It also found that the existing strength model underestimated the tested values in the medium to high suction range, therefore a segmented strength equation was introduced for enhanced predictions of the strength properties of lateritic clay.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Prabhath Ranjan Kumar Soda, Asheer Mogal, Kalyan Chakravarthy, Nikhil Thota, Nimish Bandaru, Sanjay Kumar Shukla, K. M. Mini
Summary: This study investigates the use of encapsulated bacteria to improve the self-healing ability of concrete. Through various tests, it is found that using 20% cement-coated alginate beads (CCAB) and 5% nanosilica (NS) can achieve optimal strength and healing. This research is significant for enhancing the durability of concrete.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Shizhe Wang, Haiping Wu, Wen Yang, Wei Wang, Zhibo Zhu, Kun Nie, Luoxin Wang, Hua Wang, Jing Wu
Summary: In this study, photothermal-heat storage concrete (PHSC) was developed with excellent photothermal conversion performance and heat storage capacity. By absorbing and storing solar energy during the day and releasing it at night, PHSC can effectively reduce energy consumption in buildings.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Robin Deb, Jialuo He, Geetika Mishra, Yaghoob (Amir) Farnam
Summary: Incorporation techniques of phase change materials in cementitious composites have a significant influence on thermal properties. This study investigated the thermal behavior of low-temperature PCM when subjected to varying temperature change rates and pore confinement inside the porous network of lightweight aggregates. The results showed that ramp rates affect the nucleation and crystallization growth process during the phase transition, and the pore structure of the aggregates affects the supercooling phenomenon and confinement pressure of the PCM.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Eduardo Ferreira, Payam Sotoudeh, Dagmar Svecova
Summary: This study investigates the fatigue behavior of concrete under different stress reversal conditions. The results indicate that stress reversal generally causes more severe damage and reduces the cycles to failure compared to tensile fatigue. Additionally, adding some level of compression contributes to the energy required for failure under stress reversal fatigue. Specimens with higher concentration of fractured aggregates achieve longer fatigue lives.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Mag Raj Gehlot, Sandeep Shrivastava
Summary: This study evaluates the compatibility relationship between plaster bonds and the substrate under an accelerated aging environment, and finds that incorporating an appropriate amount of granite cutting waste can improve the strength parameters and adhesion of the cement mortar.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Min Zhang, Qirui Luo, Mingke Deng, Shixing Zhao
Summary: This study investigated the bond behavior between carbon FRCM composites with added short fibers and concrete substrates. The effects of different factors were considered and 36 specimens were tested and discussed. The experimental results were analyzed in terms of failure mode, load-slip curve, and characteristic parameters, and the contribution of weft yarns was taken into account in the developed bondslip model.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Dengkai Liu, Hongniao Chen, Ray Kai Leung Su
Summary: The susceptibility of building stones to fire and high temperature was investigated in this study by examining their physical and mechanical properties. The results show that both compressive and tensile properties of stones are affected by temperature changes. The tensile strength is particularly sensitive to temperature changes, requiring special attention to the components subjected to tensile stress in stone buildings. Principal component analysis was used to predict the mechanical properties of stones, providing a new method for calculating the residual mechanical properties after high temperature or fire.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Joso Maria Raposo, Eduardo Cavaco, Luis Costa Neves, Eduardo Julio
Summary: This paper investigates the correlation between the friction coefficient and the surface roughness of concrete-to-concrete interfaces. Experimental tests were performed on specimens with different surface treatments, and the surface roughness parameters were analyzed and correlated with the shear strength and friction coefficient. The results showed that certain roughness parameters had a strong positive correlation with the friction coefficient, while others had little or no correlation. A novel combined roughness parameter with optimized correlation was proposed.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Chiara Riccardi, Massimo Losa
Summary: The interest in using bio materials in asphalt pavements is growing due to economic reasons and environmental benefits. This study aimed to review the use of bio extenders as additives in binders, with a focus on replacements greater than 20% of fossil binder. The properties of bio-extended binders were found to vary substantially depending on the biomass source and production process.
CONSTRUCTION AND BUILDING MATERIALS
(2024)