Article
Engineering, Civil
Niloufar Moshiri, Enzo Martinelli, Christoph Czaderski, Davood Mostofinejad, Ardalan Hosseini, Masoud Motavalli
Summary: Fiber-reinforced polymer (FRP) composites are commonly used as externally bonded reinforcement (EBR) systems for strengthening reinforced concrete members. A new technique, externally bonded reinforcement on grooves (EBROG), has been proposed to enhance the bond strength between the FRP composite and concrete by using grooves in the concrete substrate. This study investigates the influence of groove depth on the debonding process of prestressed carbon FRP strips.
JOURNAL OF COMPOSITES FOR CONSTRUCTION
(2023)
Article
Construction & Building Technology
Fatemeh Mohammadi Ghahsareh, Davood Mostofinejad
Summary: This paper compares the bond strength, effective bond length, and bond behavior of EBROG specimens with different groove angles and patterns. The results show that longitudinal and transverse grooves have greater bond strength and effective bond length compared to diagonal grooves. Zigzag and parallel diagonal grooves yield similar bond resistance but exhibit different bond behavior.
CONSTRUCTION AND BUILDING MATERIALS
(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)
Review
Mechanics
Khaled Sanginabadi, Azad Yazdani, Davood Mostofinejad, Christoph Czaderski
Summary: This study reviewed and compared the influential parameters and the bond behavior between fiber reinforcement polymer (FRP) composites and concrete substrate using the externally bond reinforcement on grooves (EBROG) method. The results showed that the EBROG method considerably improved the bond behavior and a combination of FRP rupture and debonding was observed at the FRP-adhesive interface over the grooves.
COMPOSITE STRUCTURES
(2022)
Article
Mechanics
Yuyang Pang, Gang Wu, Haitao Wang, Danying Gao, Pu Zhang
Summary: The bond-slip model of CFRP-steel bonded interface is crucial for predicting the bond behavior of CFRP-strengthened steel structures. Few scholars have investigated CFRP delamination failure based on the interfacial bond-slip model. Experimental data verified the accuracy of the model considering adhesive thickness and inter-laminar shear properties of the CFRP plate.
COMPOSITE STRUCTURES
(2021)
Article
Chemistry, Physical
Xinyan Guo, Zuodong Wu, Yi Yang, Jiahao Bai, Qianziyang Zhou
Summary: The bond-slip relationship of the CFRP-steel interface was studied through experiments and numerical tests in this paper. An effective finite element model was established to analyze the bond characteristics of CFRP-strengthened steel plates.
Review
Construction & Building Technology
Mohd Basri Che Bakar, Raizal Saifulnaz Muhammad Rashid, Mugahed Amran, Mohd Saleh Jaafar
Summary: This study analyzed literature data on bond strength between concrete and CFRP bars using the pullout test. The pullout test and bond stress-slip model were reviewed, and characteristic bond strength behavior was analyzed. Over 273 CFRP bar specimens were analyzed from previous experimental works worldwide. Key findings include the wide use of the pullout test for bond strength determination and the significant impact of concrete compressive strength, bar diameter, modulus of elasticity, embedment length, and surface treatment on bond performance. It is also highlighted that the development of an analytical model for bond stress-slip is crucial for understanding the interaction behavior and performing numerical analysis. Additionally, the bond strength predicted by ACI 440.1R-15 proved to be more practical than international guidelines. Recommended research areas for further investigation were also discussed.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
Article
Mechanics
Qiang Wang, Hong Zhu, Yixuan Tong, Weiqiang Su, Pu Zhang
Summary: The study showed that using the newly developed aluminium alloy additional ribs (ARs) anchorage system can enhance the elastic bond, descending bond, ultimate bond, and residual bond of ribbed CFRP bars in concrete. The improvement in elastic bond strength was most significant. The notch effect caused by the ARs can be alleviated by adjusting the number, spacing, and locations of the ARs. A new bond-slip constitutive model proposed in the study demonstrated high fitting accuracy and applicability for depicting the pull-out process of both unanchored and anchored CFRP ribbed bars in concrete.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Civil
Abbas Fathi, Georges El-Saikaly, Omar Chaallal
Summary: In this study, the bond behavior between CFRP and concrete was evaluated through a series of pullout tests. The results showed that using CFRP fabric sheets can enhance bond load-carrying capacity and ductility compared to CFRP laminates. Additionally, a bilinear bond-slip model considering the CFRP width factor was proposed and shown to accurately predict the maximum local bond stress and CFRP slippage through comparison with existing databases.
JOURNAL OF COMPOSITES FOR CONSTRUCTION
(2023)
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
Mechanics
Jialing Ou, Yongbo Shao, Chao Huang, Xin Bi
Summary: The study investigates the bond behavior of CFRP sheets-to-steel double-lap shear (DLS) joints with different steel surface treatments. The effects of six different treatments on the mechanical response of the joints are examined and a qualitative relationship between surface topography and mechanical behavior is established. A simplified bond-slip model, accounting for different surface treatments, is developed and validated through experimental results.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Civil
Akram Jawdhari, Abheetha Peiris, Amir Fam, Issam Harik
Summary: Short ultrahigh-modulus (UHM) carbon fiber-reinforced polymer (CFRP) strip panels connected through finger joint configuration can effectively strengthen steel girders. Finite element analysis was used to evaluate the interfacial and flexural behavior of the strip panels. The study showed that strip panels with finger joints provided greater load-carrying capacity compared to traditional splice plate methods.
JOURNAL OF COMPOSITES FOR CONSTRUCTION
(2023)
Article
Engineering, Civil
Gui-hua Xie, Yi You, Zi-an Tao, Shi-quan Li
Summary: The present study aims to optimize the adhesive layer of the CFRP-steel interface and establish a theoretical model of predicting the interfacial behaviors of the optimized CFRP-steel joints. Experimental results show that the mechanical properties of the adhesive are improved with the addition of nano-SiO2 up to 1.4 wt%. The unmodified CFRP-steel interface exhibits a bilinear bond-slip law, while the modified interface presents a trilinear curve due to the filling of nano-SiO2. Optimized joints can achieve larger fracture toughness and higher load capacity.
THIN-WALLED STRUCTURES
(2023)
Article
Chemistry, Physical
Wanxu Zhu, Wei Wei, Fengrong Liu, Rong Zeng
Summary: A friction-based wedge anchorage system for CFRP plates was designed and analyzed, ensuring its stability and safety in large spatial structures. The proposed anchorage system was theoretically and experimentally explored, with optimized anchor achieving an anchorage efficiency coefficient of 97.9%.
Proceedings Paper
Engineering, Civil
Niloufar Moshiri, Christoph Czaderski, Davood Mostofinejad, Ardalan Hosseini, Masoud Motavalli
Summary: The effect of the externally bonded reinforcement on groove (EBROG) method on the bond behavior of non-prestressed fiber reinforced polymer (FRP) composites to concrete has been studied. The results showed that the EBROG method has a higher bond resistance compared to the conventional externally bonded reinforcement (EBR) method. The bond resistance increases with the increase of groove depth. When using the EBROG method, cracks were observed in the concrete outside the bond area.
10TH INTERNATIONAL CONFERENCE ON FRP COMPOSITES IN CIVIL ENGINEERING (CICE 2020/2021)
(2022)
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)