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
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
Construction & Building Technology
Fatemeh Mohammadi Ghahsareh, Davood Mostofinejad, Sepehr Batebi
Summary: This study investigated the effects of different groove classes on the effective bond length of CFRP sheets and the bond behavior between CFRP and concrete in EBROG joints. The results showed a significant increase in effective bond length in the tested EBROG joints compared to the EBR joints. The bond strength in longitudinal and transverse groove directions was similar but followed different bond mechanisms.
ACI STRUCTURAL JOURNAL
(2022)
Article
Engineering, Civil
M. Talha Junaid, Abdul Saboor Karzad, Abdalla Elbana, Salah Altoubat
Summary: This paper presents an experimental investigation into the shear behavior of Glass Fiber Reinforced Polymer (GFRP) reinforced concrete beams. It also examines the effectiveness of shear strengthening using externally-bonded Carbon Fiber Reinforced Polymer (EB-CFRP) sheets and investigates the possibility of interaction between internal and externally bonded shear reinforcement. The results show that GFRP is a viable reinforcement for different types of concrete, and EB-CFRP proves to be a feasible strengthening technique. The difference in shear strength gain between different arrangements of EB-CFRP may indicate interaction between internal and external shear reinforcement.
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
Polymer Science
Kaffayatullah Khan, Mudassir Iqbal, Rahul Biswas, Muhammad Nasir Amin, Sajid Ali, Jitendra Gudainiyan, Anas Abdulalim Alabdullah, Abdullah Mohammad Abu Arab
Summary: This study presents a comparative analysis of hybrid models that combine support vector machines (SVMs) with meta-heuristic optimization algorithms (MOAs) to predict the ultimate interfacial bond strength (IBS) capacity of fiber-reinforced polymer (FRP). The developed hybrid SVM models showed high accuracy, with R-2 values ranging from 0.8870 to 0.9774 in the training phase and from 0.8270 to 0.9294 in the testing phase. The SVM-HHO model, which combines SVM with the Harris hawks optimization algorithm, was found to be the most accurate in both training and testing phases. The results suggest that the developed hybrid SVM model can be used as an alternative tool for estimating the ultimate IBS capacity of FRP concrete in civil engineering projects.
Article
Construction & Building Technology
Hai -Bin Huang, Wei Zhang, Zhi-Guo Sun, Dong-Sheng Wang
Summary: This study aims to develop probabilistic models for predicting the bond strength of fiber-reinforced polymer (FRP) to concrete joints and quantify the associated uncertainties. By collecting an experimental database and calibrating two deterministic bond strength models, the predictive models are determined and their accuracy and reliability are verified through experiments.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Niloufar Moshiri, Christoph Czaderski, Davood Mostofinejad, Masoud Motavalli
Summary: A new method named EBROG was investigated and compared with the conventional EBR method to increase the bond resistance of prestressed CFRP strips to concrete. Experimental results showed an increased bond resistance for the EBROG method with a factor of 2.4, as well as a significant improvement in fracture energy and bond resistance of prestressed joints.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Chemistry, Physical
Pawel Tworzewski, Jeffrey K. Alexy, Robert W. Barnes
Summary: This study compares seven models and evaluates their accuracy in predicting the debonding failure of fiber-reinforced polymers (FRP). Based on the experimental results of 58 flexural specimens, the latest models proposed by Said and Wu, as well as Elsanadedy et al., show the highest accuracy in predicting load capacity.
Article
Construction & Building Technology
Le Huy Sinh, Masato Komuro, Tomoki Kawarai, Norimitsu Kishi
Summary: The study found that the AFRP sheet bonding method can significantly enhance the impact resistance capacity of strengthened beams, but the effect may vary under larger impact energy. Additionally, increasing the sheet volume may not necessarily improve the debonding of the AFRP sheet.
Article
Chemistry, Physical
Paolo Foraboschi
Summary: This paper discusses the changing of load distribution from distributed to concentrated in reinforced concrete beams and presents a design method to enhance the shear capacity of the beam. The method involves the application of fiber composites bonded to the beam's stirrups at a 45-degree angle. The paper also provides an analytical model to predict the concentrated load-carrying capacity of the strengthened beam.
Article
Construction & Building Technology
Erfan Shabani, Davood Mostofinejad, Alireza Saljoughian
Summary: The study investigated the bond behavior of prestressed FRP sheets used to strengthen reinforced concrete elements and the types of grooves used. Results showed that the groove with a 5x5 mm distance at 15 mm performed better than the groove with a 10x10 mm distance at 20 mm and required 53% less filling resin. The grooving method outperformed the externally bonded reinforcement method at all prestressing levels and allowed more concrete to engage force transfer, thus improving the overall performance of the joint.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Polymer Science
Alba Codina, Cristina Barris, Younes Jahani, Marta Baena, Lluis Torres
Summary: This study compares different formulations in predicting intermediate crack debonding (ICD) loads in RC beams strengthened with FRP. The results show that all models can predict the ICD failure mode accurately.
Article
Engineering, Civil
Rami A. Hawileh, Haya H. Mhanna, Ahmad Al Rashed, Jamal A. Abdalla, M. Z. Naser
Summary: The experimental study demonstrated that RC beams strengthened with PET-FRP showed significant strength enhancement and higher ductility compared to beams strengthened with conventional CFRP and unstrengthened beams. PET-FRP is a promising strengthening material that improves structural performance and provides a sustainable alternative to traditional FRP strengthening systems.
ENGINEERING STRUCTURES
(2022)
Article
Construction & Building Technology
Sameh Yehia, Bader Faihan, Arafa M. A. Ibrahim
Summary: This study investigated the performance of opened beams reinforced with internal and external strengthening. The results showed that the opened beam without enhancement lost 75% of the maximum load compared to the solid beam. However, placing internal steel or BFRP bars and using an external BFRP sheet greatly increased the maximum load of the opened beam. The combination of both internal steel reinforcement and external BFRP sheet resulted in a 137% increase in maximum load compared to the non-enhanced opened beam.
Article
Construction & Building Technology
Mohsen Amoushahi Khouzani, Mehran Zeynalian, Mahmoud Hashemi, Davood Mostofinejad, Farhang Farahbod
STRUCTURAL CONCRETE
(2020)
Article
Construction & Building Technology
Nasrin Karimi, Davood Mostofinejad
CONSTRUCTION AND BUILDING MATERIALS
(2020)
Article
Engineering, Civil
Davood Mostofinejad, Navid Jafarian, Ali Naderi, Amirmahdi Mostofinejad, Mohamad Salehi
Article
Construction & Building Technology
Hadi Bahmani, Davood Mostofinejad, Sayyed Ali Dadvar
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2020)
Article
Engineering, Civil
Davood Mostofinejad, Mohammad Sadegh Salimian, Maryam Taherirani, Masood Noroozolyaee
Summary: The study found that the grooving method effectively enhanced the performance and load-bearing capacity of the columns. For different eccentricity ratios, columns strengthened with the EBROG method showed a significant increase in load-carrying capacity.
JOURNAL OF COMPOSITES FOR CONSTRUCTION
(2021)
Article
Construction & Building Technology
Nafise Hosseini Balam, Bahareh Tayebani, Davood Mostofinejad
Summary: This study explores the use of bacteria to enhance the durability of concrete, with seawater serving as a beneficial curing environment. Results show that bacterially-treated concrete exhibits improved performance in seawater, including reduced water absorption and increased compressive strength.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2021)
Article
Construction & Building Technology
Saadat Eshaghi-Milasi, Davood Mostofinejad, Alireza Saljoughian, Hadi Bahmani
Summary: This study investigates the behavior of reinforced concrete columns retrofitted with ultra-high-performance fiber-reinforced concrete (UHPFRC) jackets and fiber-reinforced polymer (FRP) wraps under different loading conditions. The results show that the load-carrying capacity and ductility of the columns improve significantly after retrofitting, particularly for higher eccentricities.
STRUCTURAL CONCRETE
(2022)
Article
Engineering, Civil
Davood Mostofinejad, Iman Moosaie, Mohamadreza Eftekhar, Ebrahim Hesami
Summary: Ultra-high performance concrete (UHPC), a new generation of cementitious composite material with notable mechanical characteristics, has the potential to be widely used. This research investigates the compressive strength and flexural behavior of UHPC composites with different mixture designs and curing conditions. The results show that a stepwise method can significantly increase the compressive strength, and the hybridization of polyvinyl alcohol (PVA) and modified polypropylene (PP) fibers can greatly enhance the flexural strength, toughness, and energy absorption capacity of UHPC. The strain-hardening properties of the hybrid fiber-reinforced UHPC are more pronounced compared to engineered cementitious composites (ECC).
IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY-TRANSACTIONS OF CIVIL ENGINEERING
(2022)
Article
Construction & Building Technology
Ali Soleimani Borujerdi, Davood Mostofinejad, Hyeon-Jong Hwang, Mohammad Sadegh Salimian
Summary: This study investigated the seismic behavior of RC exterior beam-column joints with insufficient joint hoops and using high-strength materials, and found that the use of high-strength bars increased bond-slip and decreased energy dissipation capacity.
JOURNAL OF BUILDING ENGINEERING
(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
Engineering, Civil
Hadi Bahmani, Davood Mostofinejad, Sayyed Ali Dadvar
Summary: This study investigated the mechanical properties and microstructure of ultra-high-performance fiber-reinforced concrete (UHPFRC) specimens containing natural zeolite as a partial replacement for cement. The results showed that the UHPFRC mixtures containing natural zeolite exhibited enhanced compressive strength. The use of barchip fibers and zeolite as a pozzolanic material improved the mechanical properties and microstructure of the UHPFRC specimens.
IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY-TRANSACTIONS OF CIVIL ENGINEERING
(2022)
Article
Construction & Building Technology
Mohammadreza Hajiaghamemar, Davood Mostofinejad, Hadi Bahmani
Summary: This paper investigates the performance of high-strength concrete (HSC) with steel slag as a replacement for natural aggregates under high temperatures. The results show that HSC made with steel slag and reinforced with steel fibers and calcium aluminate cement has higher compressive and flexural strengths at high temperatures.
STRUCTURAL CONCRETE
(2023)
Article
Construction & Building Technology
Davood Mostofinejad, Omid Aghamohammadi, Hadi Bahmani, Saeed Ebrahimi
Summary: This study investigates the effects of adding rubber particles and silica fume on the thermal characteristics, energy absorption, and mechanical properties of concrete. The results show that the addition of rubber and silica fume can reduce the thermal conductivity and increase the energy absorption of concrete, but it decreases the compressive strength and flexural strength.
DEVELOPMENTS IN THE BUILT ENVIRONMENT
(2023)
Article
Construction & Building Technology
Davood Mostofinejad, Nasrin Karimi, Bahareh Tayebani
Summary: The study shows that using bacteria as reinforcement in concrete can significantly reduce water absorption and increase compressive strength, especially in concrete reinforced with fibers. The bacteria are capable of forming calcite sediments, with greater deposits formed due to bacterial activity than by the spores used in the surface treatment.
ACI MATERIALS JOURNAL
(2022)
Article
Engineering, Multidisciplinary
Niloufar Moshiri, Christoph Czaderski, Davood Mostofinejad, Ardalan Hosseini, Khaled Sanginabadi, Matteo Breveglieri, Masoud Motavalli
COMPOSITES PART B-ENGINEERING
(2020)
