Bond of self-compacting concrete incorporating silica fume: Top-bar effect, effects of rebar distance from casting point and of rebar-to-concrete relative displacements during setting

Trezos, Konstantinos G.; Sfikas, Ioannis P.; Orfanopoulos, Konstantinos

doi:10.1016/j.conbuildmat.2014.09.113

Cited by 24 publications

(10 citation statements)

References 16 publications

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“…The average drop of the normalised bond strength of the steel bars across the lengths of the specimens was approximately 11%. But there are studies in which no bond loss is evident for distances from the casting point of up to 1.60 m (Sfikas and Trezos 2013;Trezos et al 2014). For shorter distances from the casting point, up to 0.90 m (Thrane et al 2010), no evident bond loss was observed.…”

Section: Previous Investigationsmentioning

confidence: 99%

“…A significant number of studies (Castel et al 2006;Trezos et al 2014) propose the use of τ max due to its clear and unambiguous definition. The other representative value τ m, which is also widely used in the literature (Desnerck et al 2010;Valcuende and Parra 2009) and is also recommended by RILEM Recommendation RC 6 (1983), is the arithmetic mean of the bond stresses τ 0.01 , τ 0.10 and τ 1.00 , corresponding to slips of 0.01, 0.10 and 1.00 mm, respectively.…”

Section: Analysis Proceduresmentioning

confidence: 99%

“…A major part of the literature shows that the bond strength in SCC is generally at the same level or higher than that of normal vibrated concrete (NVC) (Castel et al 2006;Hassan et al 2009;Desnerck et al 2010) and it frequently indicates a lesser scatter. Moreover, SCCs are described as concretes with higher stiffness (modification in the bond strains growth relative to bar displacement in the concrete) (König et al 2003;Wang and Zheng 2005) Some studies have also addressed other aspects related to bond strength, for example the top-bar effect or the failure behaviour (Khayat et al 1997;Castel et al 2006;Trezos et al 2014). Most of the world publications indicate that the SCC's behaviour is either equal or better than that of NVC for high elements.…”

Section: Previous Investigationsmentioning

confidence: 99%

“…To be able to compare the bond strength behaviour of the various concretes used in this research, the concept of normalised bond strength has been introduced. It is obtained by dividing the stress value by the square root of the compressive strength of the batch tested (τ/f c 0.5 ), which is the criterion found most often in the literature (Orangun et al 1974;Valcuende and Parra 2009;Trezos et al 2014). The normalization was done using the values of the compressive strength obtained from the studies carried out on the reference specimens, according to the EN 12390-3 (2009) guidelines ( Table 2).…”

Section: Analysis Proceduresmentioning

confidence: 99%

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The Top-Bar Effect in Specimens with a Single Casting Point at One Edge in High-Performance Self-Compacting Concrete

Dybeł

Wałach

Ostrowski

2018

ACT

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An investigation of the steel-to-concrete bond in high-performance self-compacting concrete (HPSCC) is presented based on direct pull-out tests. The investigation was performed on specimens made of three different HPSCC mixes with varying contents of silica fume (without, 5 and 10% by mass of cement). Specifically, the top-bar effect in specimens with a single casting point at one edge was examined. Horizontal specimens with transverse rebars distributed over their heights (480 mm) and lengths (1600 mm) were cast. The bond capacity of the HPSCC was decreased across the length up to the measured rebar distance from the casting point. The reduction occurred with the same magnitude in both the lower and upper section of the horizontal specimens. It was found that the top-bar effect did not change significantly with an increasing distance of the rebars from the casting point of the concrete mixture. It was demonstrated that the modification of the HPSCC using the silica fume significantly improved the quality of the bond conditions.

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Section: Previous Investigationsmentioning

confidence: 99%

Section: Analysis Proceduresmentioning

confidence: 99%

Section: Previous Investigationsmentioning

confidence: 99%

Section: Analysis Proceduresmentioning

confidence: 99%

See 2 more Smart Citations

The Top-Bar Effect in Specimens with a Single Casting Point at One Edge in High-Performance Self-Compacting Concrete

Dybeł

Wałach

Ostrowski

2018

ACT

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“…In the literature, one can find merely a few works dedicated to the problem analysed here [15][16][17][18][19]. Those works focused only on evaluating the influence of the changes of the bond between reinforcement bars and concrete depending on the distance to the mixture casting point.…”

Section: Introductionmentioning

confidence: 99%

Effect of casting direction on bond of reinforcement in High Performance Self-Compacting Concrete (HPSCC)

Dybeł

2019

MATEC Web Conf.

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This paper presents the results of an investigation into the steel-to-concrete bond in high-performance self-compacting concrete (HPSCC) based on direct pull-out tests. Specifically, the effect of the casting direction on bond properties is examined. Two variants of concrete mixture casting were considered in this work: from the top and from the bottom of a mould with a single casting point at one edge. Horizontal specimens with transverse rebars distributed over their heights (480 mm) and lengths (1600 mm) were cast. The experimental program has shown that the direction of concreting plays an important role in the formation of the bond condition. In the case of casting a mixture from the bottom of a mould, in the lower part of a specimen there is no significant change of the bond stress. However, there is a strong improvement in the upper part. The phenomenon observed eliminates the top-bar effect. What is more, for the rebars situated in the upper part of a specimen, improvements in bond characteristics, such as the bond stiffness, bond strength and the effect of the rebar distance from the casting point are all observed in the case of casting a mixture from the bottom of a mould.

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Effects of silica fume fineness on mechanical properties of steel fiber reinforced lightweight concretes subjected to ambient and elevated temperatures exposure

Arel

Shaikh

2018

Structural Concrete

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This paper presents the effects of silica fume (SF) fineness and fiber aspect ratios of steel fiber on fresh and harden characteristics of high‐strength lightweight concrete containing oil palm shell as coarse aggregates. The effect of elevated temperatures on the residual compressive strength of above concretes is also evaluated in this study. Three different SF fineness of 18 400, 21 000, and 28 000 m2/kg and 2 different aspect ratios of steel fiber of 40 and 80 are considered. Results show that the increase in SF fineness and steel fiber aspect ratio marginally affect the air‐dry density of steel fiber reinforced lightweight high‐strength concretes, however, the workability is reduced by about 9% to 14% due to increase in SF fineness. The compressive strength of steel fiber reinforced lightweight concretes at all age increases with increase in SF fineness and an improvement of about 37% is observed at 56 days by increasing the SF fineness from 18 400 to 28 000 m2/kg. Strong correlations are also observed between the strength improvement factor and the SF fineness. Water absorption of above concretes is also reduced by 3% to 14% due to increase of SF fineness from 18 400 to 21 000 and 28 000 m2/kg. The increase of SF fineness also significantly reduces the residual compressive strength loss at 300°C and 450°C. This loss of residual compressive strength is lower in lightweight concretes containing 16 mm long steel fiber than 8 mm long steel fiber. The existing Eurocode model overestimates the residual compressive strength of steel fiber reinforced lightweight concretes containing no SF, however, this discrepancy is significantly reduced with increase in SF fineness.

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Bond of self-compacting concrete incorporating silica fume: Top-bar effect, effects of rebar distance from casting point and of rebar-to-concrete relative displacements during setting

Cited by 24 publications

References 16 publications

The Top-Bar Effect in Specimens with a Single Casting Point at One Edge in High-Performance Self-Compacting Concrete

The Top-Bar Effect in Specimens with a Single Casting Point at One Edge in High-Performance Self-Compacting Concrete

Effect of casting direction on bond of reinforcement in High Performance Self-Compacting Concrete (HPSCC)

Effects of silica fume fineness on mechanical properties of steel fiber reinforced lightweight concretes subjected to ambient and elevated temperatures exposure

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