Effect of elevated temperature on bond between steel reinforcement and fiber reinforced concrete

Haddad, Rami H.; AlSaleh, Raed; Al-Akhras, Nabil M.

doi:10.1016/j.firesaf.2007.11.002

Cited by 149 publications

(51 citation statements)

References 13 publications

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“…e pullout loads of the deformed steel reinforcement are a ected by the mechanical properties of the concrete mix, concrete cover, amount of steel bers, and the aspect ratio of the steel bers. A study carried out by Haddad [12] similarly showed that the bond strength of concrete with steel bers added by 2% volume was increased by 23% of the bond strength of plain concrete.…”

Section: Introductionmentioning

confidence: 97%

Feasibility of Reduced Lap‐Spliced Length in Polyethylene Fiber‐Reinforced Strain‐Hardening Cementitious Composite

Choi

Jang

Kim

2018

Advances in Materials Science and Engineering

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is research investigates the interfacial behavior between polyethylene (PE) fiber-reinforced strain-hardening cement composite (PE-SHCC) and reinforcing bars that are spliced in the tension region to determine feasibility of reduced lap-spliced length in PE-SHCC. Twenty test specimens were subjected to monotonic and cyclic tension loads. e variables include the replacement levels of an expansive admixture (0% and 10%), the compressive strength of the SHCC mixtures (40 MPa and 80 MPa), and the lapspliced length in the tension region (40% and 60% of the splice length recommended by ACI 318). e PE-SHCC mixture contains polyethylene fiber to enhance the tensile strength, control the widths of the cracks, and increase the bond strength of the lap splice reinforcement and the calcium sulfo-aluminate-(CSA-) based expansive admixture to improve the tension-related performance in the lap splice zone. e results have led to the conclusion that SHCC mixtures can be used effectively to reduce the development length of lap splice reinforcement up to 60% of the splice length that is recommended by ACI 318. e addition of the calcium sulfo-aluminate-based expansive admixture in the SHCC mixtures improved the initial performance and mitigated the cracking behavior in the lap splice region.

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Section: Introductionmentioning

confidence: 97%

Feasibility of Reduced Lap‐Spliced Length in Polyethylene Fiber‐Reinforced Strain‐Hardening Cementitious Composite

Choi

Jang

Kim

2018

Advances in Materials Science and Engineering

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“…Huang presented 3D modeling of reinforced concrete (RC) beam in a fire taking the influence of the bond characteristics between concrete and reinforcing steel into account. During the past few decades, researchers have studied the effect of elevated temperatures on the residual bond strength with respect to various parameters such as the diameter of steel bars, the type of rebars, the concrete cover depth, the heating condition, and even the heating duration . However, the following two aspects which are the major components of bond stress have not been fully studied: (a) the damage of chemical adhesion due to different thermal expansion between concrete and steel and (b) accurate measurement of the coefficient of friction after elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…During the past few decades, researchers have studied the effect of elevated temperatures on the residual bond strength with respect to various parameters such as the diameter of steel bars, the type of rebars, the concrete cover depth, the heating condition, and even the heating duration. [28][29][30][31][32] However, the following two aspects which are the major components of bond stress have not been fully studied: (a) the damage of chemical adhesion due to different thermal expansion between concrete and steel and (b) accurate measurement of the coefficient of friction after elevated temperatures. In order to further understand the mechanism of bond and its degradation after elevated temperatures, more elaborate tests are needed.…”

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confidence: 99%

Basic parameters test and 3D modeling of bond between high‐strength concrete and ribbed steel bar after elevated temperatures

Zhao

Zhu²

2017

Structural Concrete

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This paper presents basic parameters test and an efficient numerical model for the bond between reinforcing bars and concrete after elevated temperatures. The chemical adhesive and friction coefficient are measured by self‐designed setups, and the variation law of the parameters is summarized. In the 3D modeling, bar‐to‐concrete interface has been modeled by means of an explicit discretization of the bar ribs. Surface‐to‐surface contact pair elements are employed for the interface, and the tangential contact behavior is elastic‐plastic with a Coulomb‐type friction model. Comparison between experimental and numerical results shows that the proposed model describes the behavior of steel bar relatively well in the pull‐out process after elevated temperatures. The 3D modeling makes up some deficiencies of macro pull‐out test, such as the detailed stress distributions and crack patterns.

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“…This is due, in particular, to several developments involving the matrix and the fibre-matrix interface. Several studies have been done on the feasibility of using HSFRC for the rehabilitation and strengthening of structural members (Haddad, 2008;Haddad and Shannag, 2008;Haddad et al, 2007Haddad et al, , 2011Martinola et al, 2010;Skazlic, 2009). Its suitability for use in the repair of fire-damaged RC columns, however, remains to be seen.…”

Section: Introductionmentioning

confidence: 99%

Confinement strengthening of heat-damaged reinforced concrete columns

Roy

Sharma

Bhargava

2016

Magazine of Concrete Research

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The effectiveness of different strengthening techniques in restoring heat-damaged concrete short columns was evaluated experimentally. Four confinement strengthening systems were employed: high-strength fibre-reinforced concrete (HSFRC), ferrocement (FC), glass-fibre-reinforced polymer (GFRP) and steel plate (SP) jacketing. Fifty-one reinforced concrete prisms of size 150 Â 150 Â 450 mm were first subjected to different elevated temperatures. Heated specimens were strengthened using one of the chosen techniques. Thereafter, all specimens were tested under monotonic loading to determine the axial ultimate strength, stiffness, ductility, energy absorption and peak stressstrain behaviour. It was observed that the GFRP jacketing was effective in restoring the compressive strength and energy dissipation, but was not capable of restoring the stiffness. However, FC and HSFRC jacketing were effective mainly in restoring the stiffness of heat-damaged concrete. SP jacketing was not effective in improving the strength or the stiffness properties. GFRP jacketing was found to be the most effective method for strengthening of fire-or heat-damaged concrete structures.

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Effect of elevated temperature on bond between steel reinforcement and fiber reinforced concrete

Cited by 149 publications

References 13 publications

Feasibility of Reduced Lap‐Spliced Length in Polyethylene Fiber‐Reinforced Strain‐Hardening Cementitious Composite

Feasibility of Reduced Lap‐Spliced Length in Polyethylene Fiber‐Reinforced Strain‐Hardening Cementitious Composite

Basic parameters test and 3D modeling of bond between high‐strength concrete and ribbed steel bar after elevated temperatures

Confinement strengthening of heat-damaged reinforced concrete columns

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