Pull-Out Tests of Deformed Bars from Ferrous Mill Tailing Concrete

2013 ◽  
Vol 477-478 ◽  
pp. 697-700
Author(s):  
Yan Zheng ◽  
Hong Zhen Kang ◽  
Guang Qi Wang
Keyword(s):  
Technical Support ◽  
Building Structures ◽  
Structural Concrete ◽  
Bond Behavior ◽  
Ordinary Concrete ◽  
Bonding Performance ◽  
Pull Out ◽  
Steel Bars ◽  
Mill Tailing

For application of FMT (ferrous mill tailing) to structural concrete, it is urgent need to study the bond behavior of reinforced bars with FMT concrete. In this paper, 72 pull-out tests of HRB335 steel bars from FMT concrete were carried out. The test phenomena and various factors influence on bond behavior were obtained. The results show that the bonding performance between deformed bars and FMT concrete is approximate to that of deformed bars and ordinary concrete. The results should provide technical support for application of FMT concrete in building structures.

scholarly journals Adherence between steel bars and lightweight concrete with EPS beads

2017 ◽  
Vol 10 (1) ◽  
pp. 122-140
Author(s):  
A. L. SARTORI ◽  
L. M. PINHEIRO ◽  
R. M. DA SILVA ◽  
S. B. FREITAS ◽  
T. G. CESAR
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Mechanical Characteristics ◽  
Lightweight Concrete ◽  
Monotonic Loading ◽  
Adherence Behavior ◽  
Ordinary Concrete ◽  
Cylinder Test ◽  
Pull Out ◽  
Steel Bars

Abstract This paper describes the adherence behavior of a structural lightweight concrete with EPS beads (SLCEB) in a monotonic loading, based in a bibliographic review and in pull-out tests. The results of these SLCEB tests were compared with those of an ordinary concrete (OC) and with the values based in indications of the Brazilian code ABNT NBR 6118:2014 - Design of concrete structures. The pull-out tests of two batches of SLCEB and one of OC were analyzed, in a total of 60 tests. Mechanical characteristics were determined too, such as: compressive strength and tensile strength in split cylinder test. The calculated results according to the above mentioned standard were very different from those obtained in the tests, indicating that the theoretical values are more conservative than the experimental ones. It was also verified that it is possible to use SLCEB in structures with respect to the adequate adherence of reinforcement in the concrete.

scholarly journals Numerical approach of the bond stress behavior of steel bars embedded in self-compacting concrete and in ordinary concrete using beam models

2013 ◽  
Vol 6 (3) ◽  
pp. 499-512 ◽  
Author(s):  
F.M. Almeida Filho ◽  
M. K. El Debs ◽  
A.L.H.C. El Debs
Keyword(s):  
Numerical Model ◽  
Constitutive Relations ◽  
Numerical Approach ◽  
Reinforced Concrete Beams ◽  
Experimental Program ◽  
Self Compacting Concrete ◽  
Bond Behavior ◽  
Ordinary Concrete ◽  
Steel Bars ◽  
Good Agreement

The present study evaluates the bond behavior between steel bars and concrete by means of a numerical analysis based on Finite Element Method. Results of a previously conducted experimental program on reinforced concrete beams subjected to monotonic loading are also presented. Two concrete types, self-compacting concrete and ordinary concrete, were considered in the study. Non-linear constitutive relations were used to represent concrete and steel in the proposed numerical model, aiming to reproduce the bond behavior observed in the tests. Experimental analysis showed similar results for the bond resistances of self-compacting and ordinary concrete, with self-compacting concrete presenting a better performance in some cases. The results given by the numerical modeling showed a good agreement with the tests for both types of concrete, especially in the pre-peak branch of the load vs. slip and load vs. displacement curves. As a consequence, the proposed numerical model could be used to estimate a reliable development length, allowing a possible reduction of the structure costs.

scholarly journals Numerical Evaluation of Bond Behavior of Ribbed Steel Bars or Seven-wire Strands Embedded in Lightweight Concrete

2020 ◽  
Author(s):  
Mohammed A. Abed ◽  
Zaher Alkurdi ◽  
Ahmad Kheshfeh ◽  
Tamás Kovács ◽  
Salem Nehme
Keyword(s):  
Reinforced Concrete ◽  
Crack Width ◽  
Lightweight Concrete ◽  
Reinforced Concrete Structures ◽  
Bond Slip ◽  
Bond Behavior ◽  
Pull Out ◽  
Steel Bars ◽  
Maximum Crack ◽  
3D Software

The bond-slip relationship between concrete and steel is significant in evaluating the nonlinear behavior of reinforced concrete structures. The force transmitted by the bond in reinforced concrete structures was studied numerically in high-strength, lightweight concrete with ribbed reinforcing steel bar or seven-wire strand, using ATENA 3D software. The first part of the study was a validation of the model based on the actual results of standardized pull-out tests using the software. Subsequently, the bond behavior was studied, where a four-point static bending test was modeled based on the real bond-slip relationship of the pull-out test. It was deduced that the ATENA 3D software can simulate the experimental tests and provide meaningful results. In addition, inferred from the numerical modeling, the maximum crack width and the mid-span deflection of the reinforced concrete beam increased when the bond stress between the concrete and the reinforcing steel bars was decreased. When a high amount of reinforcement (two strands) was used, concrete failure occurred before the strands yielded. However, further increase of the bond stress also decreased the maximum crack width and mid-span deflection. The failure occurred due to the increase in the strand yielding point by using one strand as a reinforcement of the beam.

scholarly journals Bond Behavior of Recycled Fiber Recycled Concrete with Reinforcement after Freeze-Thaw Cycles

Crystals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1506
Author(s):  
Yu Liu ◽  
Jinghai Zhou ◽  
Di Wu ◽  
Tianbei Kang ◽  
Aixia Liu
Keyword(s):  
Bond Strength ◽  
Recycled Concrete ◽  
Recycled Aggregates ◽  
Building Structures ◽  
Two Phase ◽  
Bond Behavior ◽  
Freeze Thaw ◽  
Pull Out ◽  
Recycled Fiber ◽  
Recycled Fibers

Freeze-thaw (F-T) damage is the major factor destroying the bond behavior of reinforced concrete in the cold areas of China. The bond behavior between recycled fiber recycled concrete (RFRC) and reinforcement after F-T cycles was investigated in this paper. The pull-out tests were undertaken with the replacement rate (0, 50%, and 100%) of recycled aggregates (RA) and volume content (0, 0.12%, and 0.24%) of recycled fibers (RFs) as test variables. The results demonstrate that the F-T cycles will reduce the bond strength between RFRC and reinforcement. Bond strength decreases by 69.41% after 150 cycles. Moreover, RF can improve the bond strength between RFRC and reinforcing steel. Bonding strength increases by 11.35% with the addition of 0.12% RF. A simplified two-phase bond-slip model between RFRC and reinforced steel after F-T cycles was eventually established, and it correlated well with the experimental results. This research presents a theoretical basis for the application of RFRC in building structures in cold areas.

Experimental Study on Effects of Fatigue Loading History on Bond Behavior between Steel Bars and Concrete

2016 ◽  
Vol 711 ◽  
pp. 673-680 ◽  
Author(s):  
Zhiwen Ye ◽  
Wei Ping Zhang ◽  
You Hu ◽  
Xiang Lin Gu
Keyword(s):  
Experimental Study ◽  
Bond Strength ◽  
Fatigue Loading ◽  
Critical Value ◽  
Concrete Cover ◽  
Repeated Loading ◽  
Loading History ◽  
Bond Behavior ◽  
Pull Out ◽  
Steel Bars

This paper presents an experimental investigation on the influence of fatigue loading history on bond behavior between steel bars and concrete. Reinforced concrete specimens were subjected to fatigue loadings with different amplitudes and cycles before undergoing eccentric pull-out tests. Tests revealed that all specimens failed with the splitting of the concrete cover. With increased loading cycles, the concrete in front of transverse ribs usually becomes denser at the beginning. Meanwhile, the initial bond stiffness and the bond strength increased, while the slip corresponding to the peak bond stress decreases. With the further increase of loading cycles, the bond strength begins to decrease after it reaches a critical value. This study determined that for specimens subjected to repeated loading with a larger amplitude, fewer cycles are needed for the bond strength to go up to the critical bond strength.

scholarly journals Strengthening of RC Structures by Using Engineered Cementitious Composites: A Review

2019 ◽  
Vol 11 (12) ◽  
pp. 3384 ◽  
Author(s):  
Xing-yan Shang ◽  
Jiang-tao Yu ◽  
Ling-zhi Li ◽  
Zhou-dao Lu
Keyword(s):  
Tensile Strain ◽  
Building Structures ◽  
Cementitious Composite ◽  
Multiple Cracking ◽  
Rc Structures ◽  
Engineered Cementitious Composite ◽  
Bonding Performance ◽  
Steel Bars ◽  
Extensive Collection ◽  
Strong Interfacial Bonding

This paper presents a review of the recent work assessing the performance of building structures strengthened with engineered cementitious composite (ECC). ECC characterizes tensile strain hardening and multiple cracking properties, as well as strong interfacial bonding performance with substrate concrete, which makes it a promising retrofitting material. A lot of researches have been conducted on reinforced concrete (RC) structures, including beams, columns, beam–column joints, and fire-damaged slabs, strengthened with ECC material, and an extensive collection of valuable conclusions were obtained. These strengthening systems usually combine ECC with FRP textiles or steel bars to form a composite strengthening layer. The review demonstrates that ECC strengthening can greatly improve the performance of RC structures.

Investigation of the Bond Behavior of UHPC

2014 ◽  
Vol 617 ◽  
pp. 225-228 ◽  
Author(s):  
David Čítek ◽  
Petr Huňka ◽  
Stanislav Řeháček ◽  
Jiří Kolísko
Keyword(s):  
Experimental Research ◽  
High Performance ◽  
High Performance Concrete ◽  
Anchorage Length ◽  
Bond Behavior ◽  
Ordinary Concrete ◽  
Pull Out ◽  
Prestressed Girders ◽  
Average Shear ◽  
Prestressing Strands

Ultra High Performance Concrete - UHPC has become increasingly used. Its outstanding features are generally known. It is a fact that the bond of the reinfocement in UHPC is better than that in ordinary concrete, but this bond needs to be quantified .The aim of the experimental research was to determine the average bond stress between prestressing strands and different types of UHPC and to show very significant increase in the average shear stress in bond with UHPC compared to ordinary concrete. In order to determine the bond capacity, an experimental research was carried out. Experimental details of the models in real structures – parts of prestressed girders made from UHPC, were tested in the laboratory and the results were compared with specimens prepared according to standard. The influence of different material properties and different anchorage length of prestressing strands to bond behavior of UHPC was examined in pull out tests. Test results of bond test led to the conclusion that the application of UHPC can significantly reduce the anchorage length of reinforcement compared with the ordinary concrete.

Experimental Study of Bond Stress between Concrete and FRP Rebars

2014 ◽  
Vol 488-489 ◽  
pp. 774-777 ◽  
Author(s):  
Nan Hui Yu ◽  
Ji Jun Fan
Keyword(s):  
Experimental Study ◽  
Tensile Strength ◽  
Corrosion Resistance ◽  
Unsaturated Polyester ◽  
Surface Form ◽  
Bonding Performance ◽  
Pull Out ◽  
Steel Bars ◽  
Polyester Composite ◽  
Corrosion Problem

Owing to the excellent tensile strength and corrosion-resistance of fiber reinforced unsaturated polyester composite, it is expected to solve the corrosion problem of building instead of steel bars in some special occasions. Bonding performance between concrete and FRP rebars was studied by pull-out test,the influences of the surface form, anchorage length and diameter of FRP rebar on bonding strength were discussed in detail.

Study on the interfacial bonding behaviour of corroded steel bars and TRC constrained concrete

2019 ◽  
Vol 66 (5) ◽  
pp. 661-670
Author(s):  
Chang-Shun Hu ◽  
Shiping Yin ◽  
Meng-Ti Yin
Keyword(s):  
Bond Strength ◽  
Interfacial Bonding ◽  
Detectable Effect ◽  
Textile Reinforced Concrete ◽  
Content Type ◽  
Bonding Performance ◽  
Pull Out ◽  
Steel Bars ◽  
Bonding Properties ◽  
Ultimate Bond Strength

Purpose This paper aims to evaluate the bonding properties of textile reinforced concrete (TRC)-confined concrete and corroded plain round bars. Design/methodology/approach The bonding performance of three types of specimens (not reinforced, reinforced after corrosion and reinforced before corrosion) was studied by a central pull out test. Findings The ultimate bond strength between the corroded steel bars and the concrete is improved when the corrosion ratio is small. After cracking, the degree of corrosion continues to grow and the ultimate bond strength decreases. TRC reinforcement has no detectable effect on the interfacial bonding properties between concrete and plain round bars when the corrosion of steel bars is small; however, when the concrete cracks under the action of rust corrosion, the TRC constraints can effectively improve the bonding performance of the two components. Practical implications TRC layer significantly delayed the chloride penetration rate, which can effectively limit the development of corrosion cracking.

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