Article
Mechanics
Shakiba Zolfaghari, Davood Mostofinejad, Nicholas Fantuzzi, Raimondo Luciano, Francesco Fabbrocino
Summary: In this study, the effect of groove width and depth variation on the FRP-concrete bond performance was investigated. The results showed that the grooving method increased the bond strength compared to the externally-bonded reinforcement method. The optimal groove dimensions for retrofitting were determined to be 10 x 5 mm (width x depth) with a 73.5% increase in load-carrying capacity compared to the EBR specimens.
COMPOSITE STRUCTURES
(2023)
Article
Construction & Building Technology
Kejie Zhai, Hongyuan Fang, Chengchao Guo, Pengpeng Ni, Bing Fu, Fuming Wang, Chao Zhang
Summary: This study introduces an innovative retrofitting technique utilizing externally bonded CFRP to repair damaged PCCP with broken wires. The research findings show that strengthening PCCP with CFRP at a certain prestress level and number of layers can significantly enhance its resistance, thus extending its service life.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Review
Engineering, Civil
Amr Abdel Havez, Adil Al-Mayah
Summary: Carbon fiber-reinforced polymer (CFRP) materials are widely used for flexural strengthening of concrete structures. Non-prestressed CFRP materials increase the ultimate capacity but have little effect on serviceability. Prestressed CFRP laminates provide active repair and efficiently utilize the material's tensile strength. This paper reviews the use of prestressed CFRP laminates in conventionally and internally prestressed concrete structures, discussing the flexural behavior, failure modes, and serviceability performance of the strengthened members.
JOURNAL OF COMPOSITES FOR CONSTRUCTION
(2023)
Article
Engineering, Civil
Jia-Qi Yang, Peng Feng, Bin Liu, Husheng Wang, Weiping Zhao, Lili Hu
Summary: This paper proposes a novel method for strengthening reinforced concrete (RC) beams using prestressed carbon fibre-reinforced polymer (CFRP) plates. The method is fast and easy to apply without the need for hydraulic jacks or adhesives. Test results showed that the proposed method effectively enhanced the beam strength and improved its ductility.
ENGINEERING STRUCTURES
(2022)
Article
Construction & Building Technology
Ala Torabian, Brisid Isufi, Davood Mostofinejad, Antonio Pinho Ramos
Summary: The study investigates four flexural or simultaneous flexural and punching shear retrofitting systems for strengthening a flexure-deficient flat slab. The use of EBR and EBROG techniques increased the load capacity of the slab by 12% and 21% respectively, while simultaneous flexural and shear strengthening using EBROG technique was the most effective with a 57% enhancement in load capacity. Eurocode and ACI overestimated the capacity of specimens with punching shear failure, while the yield line theory predicted reasonably well the load capacity of specimens with flexure failure.
STRUCTURAL CONCRETE
(2021)
Article
Construction & Building Technology
Amirreza Moghaddas, Davood Mostofinejad, Alireza Saljoughian, Elaheh Ilia
Summary: This study introduced an empirical bond-slip model for FRP composites attached to concrete surfaces via EBROG technique, analyzed the retrofitting effects of EBR and EBROG methods, and validated the model through single lap-shear experiments.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Engineering, Civil
Ndongo Samb, Omar Chaallal, Georges El-Saikaly
Summary: This study experimentally evaluated and compared the behavior of 18 full-size RC T-beams strengthened in shear with multilayer CFRP sheets to that of beams with monolayer strengthening fabric of equivalent density. The test results revealed that increasing CFRP weight can enhance shear resistance, but not proportionally up to an optimal value of 300 g/m(2). The influence of internal transverse steel reinforcement on EB-CFRP fabric performance was also examined, with predictions of current design guidelines closer to experimental results for beams without steel stirrups.
JOURNAL OF COMPOSITES FOR CONSTRUCTION
(2021)
Article
Polymer Science
Bu Wang, Xianhui Wu, Qi Liu, Yueyue Wu, Fei Huang, Linfeng Xu, Xing Wu, Yuanxin Deng
Summary: In this study, the feasible carbon fiber reinforced polymer (CFRP) retrofit schemes for shear strengthening of three-dimensional reinforced concrete (RC) beam-column joints were investigated. Various parameters, such as CFRP reinforcement ratio, layout, and the number and location of transverse beams, were numerically analyzed. The introduction of a new dimensionless index, strengthening efficiency, helped evaluate the residual effect of the CFRP-strengthening system. The effectiveness of the CFRP strengthening technique and the significant differences among parameter's roles were confirmed.
Article
Engineering, Civil
Peng-Da Li, Yao Zhao, Yu-Fei Wu, Jian-Ping Lin
Summary: The use of fiber-reinforced polymer (FRP) composites for strengthening concrete structures is widely adopted. Defects in the bond layer, caused by uneven concrete surface, environmental deterioration or external loading, can weaken the bonding performance of the FRP-concrete system. An experimental study was conducted to investigate the influence of interface defects on the FRP-concrete bonding behavior. The results showed that defect size, shape, and location have significant effects on the bonding performance, with higher concentrations of defects leading to a greater decrease in the FRP-concrete bearing capacity, particularly for defects closer to the FRP boundary.
ENGINEERING STRUCTURES
(2023)
Article
Construction & Building Technology
Reza Zamani Ghaleh, Davood Mostofinejad
Summary: Grooving methods for anchoring FRP have shown higher efficiency than externally bonded reinforcement (EBR) in retrofitting concrete structures. This study evaluated the behavior of externally bonded reinforcement in grooves (EBRIG) and found that it performs better than externally bonded reinforcement on grooves (EBROG).
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Reza Zamani Ghaleh, Davood Mostofinejad
Summary: The study compares the efficiency of grooving methods (GM) and Externally Bonded Reinforcement (EBR) in anchoring Fiber Reinforced Polymers (FRP) for flexural retrofitting concrete structures. Results show that EBRIG method outperformed EBROG method in bond strength enhancement, with specimens showing substantial improvement in bond properties.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Civil
Khattab Al-Ghrery, Riadh Al-Mahaidi, Robin Kalfat, Nazar Oukaili, Alaa Al-Mosawe
Summary: This study investigates the behavior of concavely curved soffit reinforced concrete beams strengthened with carbon fiber-reinforced polymer composites under static loading. The experiments show that all strengthened beams failed due to intermediate crack-induced debonding of the CFRP. The study provides recommendations for strengthening concavely curved RC beams.
JOURNAL OF COMPOSITES FOR CONSTRUCTION
(2022)
Article
Materials Science, Composites
Mahdie Mohammadi, Davood Mostofinejad
Summary: The growing industrialization has increased exposure of structures to aggressive conditions, requiring innovative wastewater collection systems. This study investigated the effects of an acid environment on FRP sheets bonded to concrete in sewer systems, finding that exposure duration affects bond strength.
JOURNAL OF COMPOSITE MATERIALS
(2021)
Article
Engineering, Civil
Reza Zamani Ghaleh, Davood Mostofinejad
Summary: This study proposes a relation for predicting the failure strain of externally bonded reinforcement on groove (EBROG) joints. By using new descriptor variables and their variations, the proposed relation is validated through experiments on 27 specimens, and it is found to have higher accuracy and generality compared to a rival model.
JOURNAL OF COMPOSITES FOR CONSTRUCTION
(2022)
Article
Engineering, Civil
Jincheng Yang, Morgan Johansson, Mohammad Al-Emrani, Reza Haghani
Summary: This paper introduces an innovative method of using prestressed CFRP plates for strengthening RC beams by achieving self-anchorage. Experimental tests showed significant improvements in flexural performance, with a utilization ratio of 81% at debonding. Numerical analyses were conducted to investigate the effect of prestressing levels and CFRP plate stiffness on flexural behavior.
ENGINEERING STRUCTURES
(2021)
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)