Experimental investigation of bond stress distribution and bond strength in unconfined UHPFRC lap splices under direct tension

2016 ◽  
Vol 74 ◽  
pp. 26-38 ◽  
Author(s):  
Fabien Lagier ◽  
Bruno Massicotte ◽  
Jean-Philippe Charron
Keyword(s):  
Experimental Investigation ◽  
Stress Distribution ◽  
Bond Strength ◽  
Bond Stress ◽  
Direct Tension ◽  
Lap Splices

scholarly journals Analytical Investigation on the Effect of Test Setup on Bond Strength

CivilEng ◽  
2021 ◽  
Vol 2 (1) ◽  
pp. 14-34
Author(s):  
Konstantinos Tsiotsias ◽  
Stavroula J. Pantazopoulou
Keyword(s):  
Bond Strength ◽  
Pullout Test ◽  
Analytical Investigation ◽  
Strength Increase ◽  
Confining Stress ◽  
Direct Tension ◽  
Bond Slip ◽  
Test Setup ◽  
Long Time

Experimental procedures used for the study of reinforcement to concrete bond have been hampered for a long time by inconsistencies and large differences in the obtained behavior, such as bond strength and mode of failure, depending on the specimen form and setup used in the test. Bond is controlled by the mechanics of the interface between reinforcement and concrete, and is sensitive to the influences of extraneous factors, several of which underlie, but are not accounted for, in conventional pullout test setups. To understand and illustrate the importance of specimen form and testing arrangement, a series of computational simulations are used in the present work on eight distinct variants of conventional bar pullout test setups that are used routinely in experimental literature for the characterization of bond-slip laws. The resulting bond strength increase generated by unaccounted confining stress fields that arise around the bar because of the boundary conditions of the test setup is used to classify the tests with respect to their relevance with the intended use of the results. Of the pullout setups examined, the direct tension pullout test produced the most conservative bond strength results, completely eliminating the contributions from eccentricity and passive confinement.

Bond stress distribution in adhesive anchor systems: Interplay of concrete and mortar creep

2022 ◽  
Vol 250 ◽  
pp. 113293
Author(s):  
Ioannis Boumakis ◽  
Krešimir Ninčević ◽  
Marco Marcon ◽  
Jan Vorel ◽  
Roman Wan-Wendner
Keyword(s):  
Stress Distribution ◽  
Bond Stress ◽  
Anchor Systems

scholarly journals Experimental study on the effect of concrete strength and corrosion level on bond between steel bar and concrete

2021 ◽  
Vol 72 (4) ◽  
pp. 498-509
Author(s):  
Vuong Doan Dinh Thien ◽  
Hung Nguyen Thanh ◽  
Hung Nguyen Dinh
Keyword(s):  
Compressive Strength ◽  
Bond Strength ◽  
Concrete Strength ◽  
Concrete Block ◽  
Bond Stress ◽  
Concrete Compressive Strength ◽  
Pull Out ◽  
Steel Bar ◽  
Stress Degradation ◽  
Slip Displacement

Corrosion of the steel reinforcement bars reduces the area of the steel bar and the bond stress between the steel bars and around concrete that decreases the capacity of concrete structures. In this study, the bond stress between steel bar with a diameter of 12mm and concrete was examined with the effect of different corrosion levels and different concrete grades. A steel bar was inserted in a concrete block with a size of 20×20×20cm. The compressive strength of concrete was 25.6MPa, 35.1MPa, and 44.1MPa. These specimens were soaked into solution NaCl 3.5% to accelerate the corrosion process with different corrosion levels in the length of 60mm. The pull-out test was conducted. Results showed that the bond strength of the corroded steel bar was higher than that predicted from CEB-FIP. Slip displacement and the range of slip displacement at the bond strength were reduced when the concrete compressive strength was increased. The rate of bond stress degradation occurred faster with the increment of the corrosion level when the concrete compressive strength was increased.

Experimental investigation on the bond strength between sustainable road bio-binders and aggregate substrates

2019 ◽  
Vol 52 (4) ◽  
Author(s):  
Lorenzo Paolo Ingrassia ◽  
Fabrizio Cardone ◽  
Francesco Canestrari ◽  
Xiaohu Lu
Keyword(s):  
Experimental Investigation ◽  
Bond Strength

Assessment of Adhesion between RPC Overlay and Existing Concrete Substrate

2015 ◽  
Vol 802 ◽  
pp. 95-100
Author(s):  
Bassam A. Tayeh ◽  
B.H. Abu Bakar ◽  
Megat Azmi Megat Johari
Keyword(s):  
Bond Strength ◽  
Experimental Program ◽  
Early Age ◽  
Structural System ◽  
Direct Tension ◽  
Conventional Concrete ◽  
Existing Structures ◽  
The Past ◽  
Joint Surfaces ◽  
Reactive Powder

The number of existing structures under repair and rehabilitation has extensively increased over the past two decades; these structures typically require performance enhancements including durable and safe repair and strengthening. The experimental program aimed to investigate the bond strength at the joint surfaces between conventional concrete substrate as existing concrete and reactive powder concrete RPC as new overlay concrete. Pull off test was used to quantify the direct tension of the bond strength. Different surfaces roughness were used for existing concrete. The obtained results, clearly showed that, RPC could be linked excellent to the existing concrete at early age; as a result, all failures occurred through the existing concrete, regardless of the surface roughness of existing concrete. RPC could be used as an excellent overlay concrete for increasing the durability at joint surfaces of the strengthened structural system.

scholarly journals CHARACTERIZATION OF SHEAR BOND STRESS FOR DESIGN OF COMPOSITE SLABS USING AN IMPROVED PARTIAL SHEAR CONNECTION METHOD

2015 ◽  
Vol 21 (6) ◽  
pp. 720-732 ◽  
Author(s):  
Redzuan Abdullah ◽  
Ahmad Beng Hong Kueh ◽  
Izni S. Ibrahim ◽  
W. Samuel Easterling
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Linear Interpolation ◽  
Bond Stress ◽  
Horizontal Shear ◽  
Shear Span ◽  
Shear Connection ◽  
Composite Slabs ◽  
Linear Shear ◽  
Effective Depth

Eurocode 4 design provisions specify two methods for the design of composite slabs, namely the m-k and the partial shear connection (PSC) methods. Currently, the m-k method includes the concrete thickness and the shear span of the slab as variables while the PSC method does not. This has resulted in a better accuracy for the m-k method when slabs with varying dimensions are considered. It is demonstrated in this paper that the horizontal shear bond stress varies with the ratio of shear span to effective depth of slab, defined as the slenderness. To include such an effect, a linear shear bond-slenderness equation is proposed. Using the proposed relationship, a linear interpolation of shear bond strength based on two configurations, determined from the outcomes of the bending tests for compact and slender slabs, has been satisfactorily performed. The shear bond strength obtained from this interpolation can be used in collaboration with the existing PSC method, such that the accuracy of the prediction of the composite slab capacity can be considerably improved, the validity of which has been verified with published results from literatures.

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