Article
Materials Science, Multidisciplinary
Aref A. Abadel
Summary: This study investigated the performance of four different strengthening techniques for improving the shear capacity of RC beams, with all proposed techniques showing a significant increase in shear strength compared to steel web reinforcement. The use of a 15 mm UHPFRC jacket demonstrated comparable shear capacity enhancement and is considered a promising technique for repairing and strengthening shear deficient RC beams.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Engineering, Civil
W. Nawaz, M. Elchalakani, S. Yehia, T. Xie, H. Liu, B. Yang, X. Guo
Summary: Lightweight construction using GFRP bars and LWC has advantages over traditional NWC structures, but there is limited knowledge on shear strengthening of GFRP-reinforced LWC beams. This study investigates the shear strengthening behavior of LWSCC beams reinforced with GFRP bars. Experimental results show that external CFRP strips improve the shear capacity of GFRP-reinforced LWSCC beams, with U-wraps and horizontal strips being the most effective configuration.
ENGINEERING STRUCTURES
(2023)
Article
Construction & Building Technology
Luma Fadhil Hussein, Mohammed M. Khattab, Mustafa Shakir Farman
Summary: The use of hybrid concrete significantly enhances the overall behavior of reinforced beams under two point loads. Beams affected by shear reinforcement and SCC layer thickness exhibit higher failure loads. Numerical simulation results are in good agreement with experimental data.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2021)
Article
Chemistry, Physical
Nisha Dhariwal, Abu Shama Mohammad Miraz, W. J. Meng, Collin D. Wick
Summary: The effect of Al doping on the stability and shear strength of the Ti/TiN interface was examined using a modified embedded atom model. By parameterizing the model to various inter-facial properties, good agreement was found with Density Functional Theory and experimental data. The presence of Al atoms led to a more negative enthalpy and increased shear strength, especially at higher Al compositions.
APPLIED SURFACE SCIENCE
(2023)
Article
Construction & Building Technology
Qiang Yuan, Ruonan Chen, Shenghao Zuo, Tingjie Huang, Kai Zhang, Da Mei
Summary: The issue of concrete vibration in the continuous beam 0# block is resolved by using a combination of self-compacting concrete (SCC) and ordinary concrete (OC). This paper studies the bonding performance between distinct layers of SCC and OC and establishes the relationship between casting time interval, curing age, and bonding strength. The results show that the casting time interval has a stronger effect on the failure mode than curing age, and the shearing test can better characterize the weakly bonded interface. A shorter casting time interval and a longer curing age lead to higher bonding strength. A mechanical model is proposed to predict the shear strength of the SCC-OC composite based on the bonding micro-mechanism. The innovative approach of combining SCC and OC is promising to solve the problem of concrete vibration in the continuous beam 0# block at a low cost.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Civil
M. Nawaz, M. Elchalakani, S. Yehia, Thong M. Pham, P. Ayough, Shidong Nie
Summary: The development and applications of high-strength lightweight self-consolidating concrete (HLWSCC) have increased due to its better mechanical properties and economic benefits. This study evaluates the shear performance of HLWSCC beams reinforced with CFRP sheet stirrups through experimental and analytical approaches. The experimental results show that the addition of CFRP sheet stirrups substantially increases the shear capacity of HLWSCC beams, and the predicted shear strength using various design standards is in good agreement with the experimental values.
Article
Construction & Building Technology
Mengke Lei, Xin Wang, Hang Meng, Zongxue Yan, Jinghui Lin, Zhishen Wu
Summary: A study on fly ash-slag geopolymer mortar (GPM) found that the amount of slag in the binder (SL/B) and the mass ratio of alkali solution to binder (A/B) significantly affected the properties of the GPM. Increasing SL/B enhanced early compressive strength but decreased fluidity and setting time, whereas A/B exhibited the opposite trend. Admixtures were necessary to meet the requirements of high early strength and fluidity of the GPM.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Civil
Waleed Nawaz, Mohamed Elchalakani, Sherif Yehia, Bo Yang, Xiao Guo
Summary: The shear behavior of fiber reinforced lightweight self-compacting concrete (FLWSCC) beams externally strengthened with CFRP strips was investigated in this experimental study. The results showed that the external CFRP strips enhanced the strength and stiffness of the specimens. The presence of steel fibers in the concrete increased the shear strength and limited the external contribution of the CFRP strips. The different FRP design standards overestimated the shear capacity of the FLWSCC specimens, with CNRDT (2013) design standard being the most conservative.
Article
Construction & Building Technology
Saim Raza, Behrouz Shafei, M. Saiid Saiidi, Masoud Motavalli, Moslem Shahverdi
Summary: The degradation of reinforced concrete structures due to aging and extreme loading can cause performance and safety concerns. Shape memory alloys (SMAs) with superelasticity and shape memory effect offer unique properties for restoring and designing RC structures. They can reduce permanent deformations, enhance strength and stiffness, and enable self-centering behavior. However, there is a lack of comprehensive review and guidance on the applications of SMAs in RC structures.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Chengqian Wen, Guotao Yang
Summary: To improve the fabrication efficiency and address the contradiction between construction progress and structural performance in composite structures, the shear performance of stud connections with different concrete ages was analyzed. 18 typical vertical push-out tests were conducted on stud shear connectors at concrete ages of 7 days, 14 days, and 28 days. The effects of concrete age, stud spacing, and stud diameter on the shear capacity, connection stiffness, and failure mode of the connectors were studied. A new relationship expression for load-slip of stud connectors with various concrete ages was proposed, and a more practical prediction equation for the shear capacity of stud connectors with different concrete ages was established by evaluating the existing design code.
STEEL AND COMPOSITE STRUCTURES
(2023)
Article
Chemistry, Physical
Tomasz Rudnicki
Summary: This article introduces a new functional method for designing self-compacting concrete, based on the double coating assumption. The method consists of four stages responsible for selecting different components of the concrete mix. The procedure takes into account the selection of the mineral skeleton to prevent aggregate grain blocking and ensures the designed liquid phase has high structural viscosity and low yield stress.
Article
Engineering, Civil
Yuxing Yang, Amit H. Varma, Michael E. Kreger, Ying Wang, Kai Zhang
Summary: The study proposed the use of T-headed bars as shear reinforcement in concrete structures to alleviate rebar congestion and installation difficulties caused by conventional single-leg stirrups. Tests showed that specimens with T headed bars exhibited higher shear strength compared to those with stirrups, while exhibiting similar behavior. Design codes from six countries were found to provide conservative estimates of shear strength for specimens with T-headed bars.
ENGINEERING STRUCTURES
(2021)
Article
Construction & Building Technology
Dang Quang Ngo, Huy Cuong Nguyen, Huu Tai Dinh, Duy Tien Nguyen, Dinh Loc Mai
Summary: This paper investigates the shear behavior of corroded stirrups reinforced concrete beams strengthened with textile reinforced concrete. Experimental results show that the shear strength of corroded specimens decreased by 16.08% to 25.34%, while the shear capacity of corroded beams strengthened with carbon TRC improved by 60.6%.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Construction & Building Technology
Sung-Gul Hong, Woo-Young Lim
Summary: This study investigates the behavior of shear-dominant beams strengthened with 150 MPa ultra-high-performance concrete (UHPC) through experiments on thirteen full-scale test specimens. The test variables include the strengthening method, thickness of the UHPC jackets, and fiber volume fraction of the UHPC. The results showed that the UHPC jacketing technique significantly improved the load resistance, ductility, and stiffness of the shear-dominant beams.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Noor Ayaad, Nazar Oukaili
Summary: This study investigates the impact responses and torsional behavior of reinforced concrete L-shaped spandrel beams under eccentric loading using strengthening techniques. The results show that the impact force increased by 46% for specimens with CFRP sheets and by 14.5% for specimens treated with the ETS method. The ETS technique proved to be more effective in enhancing torsional capability.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
