Abstract:ÖzThis research aims to evaluate the bond strength between normal strength substrate concrete and different types of high strength overlay concretes. In order to obtain different characteristics in the overlay concrete, silica fume and steel fibers were used. The slant shear and bisurface shear tests were conducted to quantify the effect of different high strength concrete compositions on the bond strength. The mechanical properties of overlay/substrate concrete composites were also analysed on cylindrical sam… Show more
“…Chen et al tested the bond strength of UHPC with a steel fiber volume fraction of 0-2.5%; bond strength increased with fiber content increase (CHEN et al, 2021). Kabay et al also found that with steel fiber mixed, tensile strength increased 17% (KABAY and KIZILKANAT, 2018). On the other hand, some researchers pointed out that due to UHPC and old concrete existing in a layer of mortar, fibers do not affect the bonding interface directly (HABER et al, 2018).…”
The bonding performance between new and old concrete affects the reliability and service life of the repair structure. However, the bonding interface is complex and has many influencing factors, so selecting appropriate repair materials and evaluation methods for repair structures under different service environments is important. This paper presents a comprehensive overview of the factors that influence bonding properties. These include the choice of repair materials, the condition of the existing concrete, the type of interfacial agents used, the service environment, and the testing methods employed. The paper concludes by examining the challenges and opportunities in developing interface bonding properties to provide insights and research directions for future theoretical analysis and experimental research.
“…Chen et al tested the bond strength of UHPC with a steel fiber volume fraction of 0-2.5%; bond strength increased with fiber content increase (CHEN et al, 2021). Kabay et al also found that with steel fiber mixed, tensile strength increased 17% (KABAY and KIZILKANAT, 2018). On the other hand, some researchers pointed out that due to UHPC and old concrete existing in a layer of mortar, fibers do not affect the bonding interface directly (HABER et al, 2018).…”
The bonding performance between new and old concrete affects the reliability and service life of the repair structure. However, the bonding interface is complex and has many influencing factors, so selecting appropriate repair materials and evaluation methods for repair structures under different service environments is important. This paper presents a comprehensive overview of the factors that influence bonding properties. These include the choice of repair materials, the condition of the existing concrete, the type of interfacial agents used, the service environment, and the testing methods employed. The paper concludes by examining the challenges and opportunities in developing interface bonding properties to provide insights and research directions for future theoretical analysis and experimental research.
“…Pure shear stress is assumed to act between the substrate and repair layers in the pure shear test. Various tests are available to determine interface shear strength, like torsion shear test (2), push through cube test (7), BSST (60)(61)(62), modified vertical shear test (57) (61), DST (63), and a mixed-mode of them.…”
Concrete is a widely used building material in the construction sector. Still, the lifespan of concrete is limited because many factors can influence the performance of concrete structures, which can be classified based on physical, chemical, and mechanical changes that occur during their service life. In addition, the structure's lifespan is being reduced due to adverse environmental conditions and loads. These require maintenance, restoration, or reconstruction. Therefore, considerable concrete remediation is necessary, and the best option is to repair it. However, the cost associated with restoring the deteriorating concrete structures is higher. The repaired concrete strength mainly depends on the interface layer, situated between the substrate (old) and overlay (new) concrete. The interface layer strength primarily depends on interface adhesion, friction, aggregate interlock, bonding agent, compaction, cleanliness, moisture content, concrete age, roughness, and time-dependent variables. Multiple tests are available to analyse the bonding behavior between substrate-overlay concrete. However, no particular method is available to access the bond strength. This paper describes various methods and techniques used by researchers to evaluate bond strength. The reviewed summary has shown that concrete repair is the best solution, and higher-strength concrete uses show better shear results; also, conventional concrete is more economical than higher-strength concrete. Among all the available tests the bi-surface shear test and slant shear test are the more suitable method to determine the bond strength.
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