Investigating the effect of steel fiber content on bond behavior between externally bonded CFRP-to-concrete joints

Structures ◽  
2022 ◽  
Vol 36 ◽  
pp. 565-579
Author(s):  
Comfort Mensah ◽  
Benzhi Min ◽  
Alex Osei Bonsu ◽  
Zhenqing Wang
Keyword(s):  
Steel Fiber ◽  
Fiber Content ◽  
Bond Behavior ◽  
Externally Bonded ◽  
Concrete Joints

scholarly journals Experimental Characterization of the FRCM-Concrete Interface Bond Behavior Assisted by Digital Image Correlation

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1154
Author(s):  
Dario De Domenico ◽  
Antonino Quattrocchi ◽  
Damiano Alizzio ◽  
Roberto Montanini ◽  
Santi Urso ◽  
...  
Keyword(s):  
Digital Image Correlation ◽  
Digital Image ◽  
Mechanical Tests ◽  
Image Correlation ◽  
Front Face ◽  
Full Field ◽  
Bond Behavior ◽  
Externally Bonded ◽  
Strengthening Technique ◽  
Concrete Interface

Digital Image Correlation (DIC) provides measurements without disturbing the specimen, which is a major advantage over contact methods. Additionally, DIC techniques provide full-field maps of response quantities like strains and displacements, unlike traditional methods that are limited to a local investigation. In this work, an experimental application of DIC is presented to investigate a problem of relevant interest in the civil engineering field, namely the interface behavior between externally bonded fabric reinforced cementitious mortar (FRCM) sheets and concrete substrate. This represents a widespread strengthening technique of existing reinforced concrete structures, but its effectiveness is strongly related to the bond behavior between composite fabric and underlying concrete. To investigate this phenomenon, a set of notched concrete beams are realized, reinforced with FRCM sheets on the bottom face, subsequently cured in different environmental conditions (humidity and temperature) and finally tested up to failure under three-point bending. Mechanical tests are carried out vis-à-vis DIC measurements using two distinct cameras simultaneously, one focused on the concrete front face and another focused on the FRCM-concrete interface. This experimental setup makes it possible to interpret the mechanical behavior and failure mode of the specimens not only from a traditional macroscopic viewpoint but also under a local perspective concerning the evolution of the strain distribution at the FRCM-concrete interface obtained by DIC in the pre- and postcracking phase.

Positive effects of aligned steel fiber on bond behavior between steel rebar and concrete

2020 ◽  
Vol 114 ◽  
pp. 103828
Author(s):  
Xuhui Zhang ◽  
Wei Zhang ◽  
Cuodong Cao ◽  
Fu Xu ◽  
Caiqian Yang
Keyword(s):  
Steel Fiber ◽  
Bond Behavior ◽  
Positive Effects ◽  
Steel Rebar

Mechanical properties of steel fiber-reinforced UHPC mixtures exposed to elevated temperature: Effects of exposure duration and fiber content

2019 ◽  
Vol 168 ◽  
pp. 291-301 ◽  
Author(s):  
Shamsad Ahmad ◽  
Mehboob Rasul ◽  
Saheed Kolawole Adekunle ◽  
Salah U. Al-Dulaijan ◽  
Mohammed Maslehuddin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Elevated Temperature ◽  
Temperature Effects ◽  
Exposure Duration ◽  
Steel Fiber ◽  
Fiber Content ◽  
Fiber Reinforced

scholarly journals Study on Mix Proportion Optimization of Manufactured Sand RPC and Design Method of Steel Fiber Content under Different Curing Methods

Materials ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 1845 ◽  
Author(s):  
Chunling Zhong ◽  
Mo Liu ◽  
Yunlong Zhang ◽  
Jing Wang
Keyword(s):  
Steel Fiber ◽  
Design Method ◽  
Fiber Content ◽  
Orthogonal Experimental Design ◽  
Curing Conditions ◽  
Practical Applications ◽  
Manufactured Sand ◽  
Binder Ratio ◽  
Curing Methods ◽  
Reactive Powder

This study investigated four factors (water/binder ratio, silica fume, fly ash, and sand/binder ratio) using the orthogonal experimental design method to prepare the mix proportions of a manufactured sand reactive powder concrete (RPC) matrix to determine the optimal matrix mix proportions. On this basis, we assessed the compressive and splitting tensile strengths of different steel fiber contents under natural, standard, and compound curing conditions to develop an economical and reasonable RPC for various engineering requirements. A calculation method for the RPC strength of the steel fiber contents was evaluated. The results showed that the optimum steel fiber content for manufactured sand RPC is 4% under natural, standard, and compound curing conditions. Compared with standard curing, compound curing can improve the early strength of manufactured sand RPC but only has a small effect on the enhancement of late strength. Although the strength of natural curing is slightly lower than that of standard curing, it basically meets project requirements and is beneficial for practical applications. The calculation formula of 28-day compressive and splitting tensile strengths of manufactured sand RPC steel fiber at 0%–4% is proposed to meet the different engineering requirements and the flexible selection of steel fiber content.

scholarly journals EFFECT OF RE-VIBRATION TIME AND STEEL FIBER CONTENT ON THE PROPERTIES OF CRUSHED CEMENT-SAND MORTAR CONCRETE Dr.

2005 ◽  
Vol 13 (2) ◽  
pp. 1-12
Author(s):  
Payman Hassan ◽  
Ali R. Yousif ◽  
Dr. Omar Qarani Aziz
Keyword(s):  
Steel Fiber ◽  
Fiber Content ◽  
Vibration Time

scholarly journals Axial Compressive Behavior of Steel Fiber-Reinforced Recycled Coarse Aggregate Concrete-Filled Short Circular Steel Columns

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Qiao-Huan Wang ◽  
Jiong-Feng Liang ◽  
Chun-Feng He ◽  
Wei Li
Keyword(s):  
Coarse Aggregate ◽  
Steel Fiber ◽  
Concrete Strength ◽  
Great Influence ◽  
Fiber Content ◽  
Fiber Reinforced ◽  
Compressive Behavior ◽  
Steel Columns ◽  
Recycled Coarse Aggregate ◽  
Short Columns

This paper attempts to explore the effects of recycled coarse aggregate content, steel fiber content, and concrete strength on the axial compressive behavior of steel fiber-reinforced recycled coarse aggregate (RCA) concrete-filled circular steel stub columns. A total of 14 short columns are tested. The results show that using RCA in concrete will reduce the bearing capacity of short columns, but the increase in steel fiber content and concrete strength can eliminate this shortcoming. Not only that, the concrete strength has a great influence on the ductility and stiffness of the specimen.

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