Bond behaviour of reinforcement in self-compacting concretes

Valcuende, M.; Parra, C.

doi:10.1016/j.conbuildmat.2008.01.007

Cited by 113 publications

(47 citation statements)

References 10 publications

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“…On the basis of conventional tensile and flexural tests, to characterize the adhesion, it should be mentioned that various researchers have achieved variable or even contradictory results, but it seems nevertheless that the adhesion between the concrete and the steel reinforcement is higher for SCCs than for VCs [27,28]. In particular, Valcuende and Parra [29] studied the adhesion between (SCC/Steel) and (VC/Steel) couples, for different water to binder ratios (w/b), different compressive strength values and Steel bar with 16mm diameter. These authors observed that the mean Normalized bond strength (τ max /fc ½ ) is greater for the (SCC/Steel) couples than for the (VC/Steel) couples.…”

Section: Resultsmentioning

confidence: 99%

Interfacial Indentation Test for the Study of Reinforcement bar/concrete matrix Adhesion i n High Performance Self Compacting Concretes

Graira¹,

Chrait²,

Montagne³

et al. 2018

jmes

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The adhesion between the concrete and its metallic reinforcement is a fundamental property that characterizes the level of load that can undergo a reinforced concrete structure, and thus allows estimating its possible degradation and therefore its residual lifetime. We note that the steel works well as reinforcement for concrete because it bonds well with concrete and this bond strength, which characterizes the adhesion, is proportional to the contact surface of the steel to the concrete. The adhesion greatly varies with changes in mix design and grade of cement used and by providing intensive heat curing, high early adhesion can be achieved [1]. Moreover, concretes compressive strength, water to binder (w/b) ratio, bar diameter, concrete cover, embedded length, and pre-flexural crack length also affect this adhesion [2]. There are 3 ways in which cement concrete is bonded to a steel reinforcement: (i) adhesion between concrete and steel bars, (ii) mechanical Interlock through ribs of steel bar and (iii) chemical reaction between steel and concrete [3]. The interfacial bond strength, which always characterizes the adhesion between the steel bar and the matrix in reinforced concrete, is generally estimated by a bending test (Beam test) or pull-out test defined in ISO 14916 standards [4]. These tests are often controversial, sensitive to experimental conditions, and not very reproducible since the dispersion of the results can reach 50% in inter-laboratory comparisons [5].In composite materials, constituents and interactions (adhesion) between them play an important role in global behavior of final material. In this regard, numerous researches have been conducted all over the world to clarify this adhesion. VC and SCC have a substantially different mix design; especially regarding the amount and proportion of coarse aggregates, water to binder (w/b) ratio and fine material, which inevitably results in distinct adhesion behavior. Interfacial Indentation AbstractThe interfacial indentation test is experimented for the first time in order to characterize the adhesion between the concrete and its steel reinforcement. This technique, developed to estimate the adhesion of thick coatings (thermal barrier, plasma torch deposits, etc.), is used here to create and propagate a crack along the concrete/reinforcement interface. The length of this crack makes it possible to calculate an apparent interfacial toughness which can then be linked to the concrete/reinforcement adhesion, and therefore to the resistance of the elaborate structure. The mechanical properties, hardness and Young's modulus of the various constituents were determined from indentation tests, and micro cracks at the concrete/reinforcement interface are generated by Vickers macro-hardness tests using indentation loads ranging from 300 to 1200 N. The properties of three concretes are compared: a high-performance vibrated concrete HPVC (VC54) and two high-performance self-compacting concretes HPSCCs (SCC54 and SCC62), both developed in the laboratory. The adhes...

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Section: Resultsmentioning

confidence: 99%

Interfacial Indentation Test for the Study of Reinforcement bar/concrete matrix Adhesion i n High Performance Self Compacting Concretes

Graira¹,

Chrait²,

Montagne³

et al. 2018

jmes

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“…Literature shows extensive investigations on fresh and mechanical properties (compressive, splitting tensile, and flexural strengths as well as modulus of elasticity, shrinkage and bond strength) of SCC including their comparison with that of CVC (Soleymani Ashtiani et al, 2011, Soleymani Ashtiani et al, 2010, Desnerck et al, 2010, Valcuende et al, 2009, De Almeida Filho et al, 2008, Domone, 2006, Persson, 2001). In addition, researchers have been working on the structural performance in RC members cast with SCC under monotonic loads in the past few years (Hassan et al, 2008, Lachemi et al, 2005, Sonebi et al, 2003.…”

Section: Introductionmentioning

confidence: 99%

Seismic Performance of High-Strength Self-Compacting Concrete in Reinforced Concrete Beam-Column Joints

2014

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SUMMARY:Beam-column joints of reinforced concrete building frames play an important role under seismic excitations. These are one of the most congested areas in reinforced concrete framed structures; placement of concrete and proper compaction in such areas are hence substantially challenging. This offers a unique area of application for self-compacting concrete which can flow through every corner of extensively reinforced area without any vibration. Therefore if implementing self-compacting concrete in beam-column joints does not compromise seismic performance of the frame, it can be used instead of conventional concrete. This paper focuses on implementation of high-strength self-compacting concrete in beam-column joints and assessment of its seismic behaviour under reversed cyclic loading. Three interior beam-column subassemblies chosen to vary in concrete type and compressive strength are designed as per the New Zealand Standard NZ3101:2006. The specimens are instrumented to measure the load, displacement/drift, ductility, joint shear deformations, and elongation of the plastic hinge zone. The cracking pattern at different load levels and the mode of failure are also recorded and compared among different specimens.

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“…Both groups concluded that no significant differences were observed between SCC and CC in terms of bond strength development. However, other studies (Dehn et al 2000;Chan et al 2003;Castel et al 2006;Valcuende and Parra 2009) have shown that SCC has higher bond strength and less top-bar effect compared with CC. These discrepancies merit additional research.…”

Section: Introductionmentioning

confidence: 89%

An Experimental Study on Bond Strength of Reinforcing Steel in Self-Consolidating Concrete

Looney

Arezoumandi

Volz

et al. 2012

Int J Concr Struct Mater

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An experimental investigation was conducted to compare the bond strength of reinforcing steel in self-consolidating concrete (SCC) with conventional concrete (CC). This study investigated two different compressive strengths of SCC as well as CC. The experimental program consisted of 24 pull-out specimens as well as 12 full-scale beams (three for each concrete type and strength). The pull-out specimens were based on RILEM recommendations, and the beam specimens were tested under a simply supported four-point loading condition. The CC test results served as a control and were used to evaluate the results from the SCC pull-out and beam specimen tests. Furthermore, a comparison was performed between results of this study and a bond database of CC specimens. These comparisons indicate that SCC beams possess comparable or slightly greater bond strength than CC beams.

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Bond behaviour of reinforcement in self-compacting concretes

Cited by 113 publications

References 10 publications

Interfacial Indentation Test for the Study of Reinforcement bar/concrete matrix Adhesion i n High Performance Self Compacting Concretes

Interfacial Indentation Test for the Study of Reinforcement bar/concrete matrix Adhesion i n High Performance Self Compacting Concretes

Seismic Performance of High-Strength Self-Compacting Concrete in Reinforced Concrete Beam-Column Joints

An Experimental Study on Bond Strength of Reinforcing Steel in Self-Consolidating Concrete

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