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Concrete confinement with steel-reinforced grout jackets

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Abstract

The potential of steel fiber reinforced jackets combined with inorganic matrix (cementitious grout matrix) as an alternative strengthening system to fiber-reinforced polymer (FRP) jackets was investigated experimentally in the current study. For this purpose, the novel jacketing device was applied on cylindrical specimens subjected to monotonic concentric uniaxial compression load. Parameters of investigation were the type of the steel fiber reinforced fabric, its density, the overlap length, and the concrete compressive strength. The 3 × 2 and 12× types of steel fabric were used with three alternative densities, characterized as high, medium and low density. Experimental evidence has shown that a single layer of SRG jacket has increased substantially both axial strength and deformation capacity. From the response of the SRG confined cylinders the degree of penetration of the grout matrix through the fabric as well as the overlap length are considered rather critical parameters for the effectiveness of the method. The experimental data were used for the derivation of a simple empirical confinement model which correlated well with other well-established FRP confinement models. The knowledge gained from this experimental study renders SRG jacketing a remarkably promising retrofit solution for reinforced concrete confinement.

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Abbreviations

D :

Diameter of cylindrical specimens

D c :

Diameter of the steel cord

\(f_{\text{cc}}^{\prime }\) :

Compressive strength of the confined concrete

\(f_{\text{cc}}^{\prime }\) :

Ultimate compressive strength of the confined concrete (80 % \(f_{\text{cc}}^{\prime }\))

\(f_{\text{co}}^{\prime }\) :

Compressive strength of the unconfined concrete

f fu,s :

Failure stress of the steel-reinforced fabric

f g,u :

Rupture shear strength of the grout

f s,deb :

Transverse stress at debonding failure of the jacket layer

f s,eff :

Transverse effective stress

f s,rupt :

Transverse stress reached at rupture of the steel reinforced fabric

H :

Height of the specimen

K :

Axial stiffness

K eff :

Effectiveness coefficient

n :

Number of cords per cm

s :

Distance between successive cords

s′(=s − D c):

Clear spacing between the steel cords

s g,u :

Slip value at shear failure of the grout

t s :

Equivalent thickness per width of the steel fabric

α, β :

Empirical constants

ε co :

Strain at failure of the unconfined concrete

ε cc :

Strain corresponding to the compressive strength of the confined concrete

ε ccu :

Strain at failure of the confined concrete at 80 % f cc ′

κ, λ :

Empirical constants

ρ SRG :

Volumetric ratio of the SRG jacket

σ lat :

Lateral confining stress due to jacketing

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Acknowledgments

The authors wish to thank the civil engineer Mrs S. Karathanou, Dr. V. Kouftidis and Mr. T. Koukouftopoulos for their assistance in the experimental program. The program was conducted in the Laboratory of Strength of Materials and Structures and funded by the Research Committee of Aristotle University of Thessaloniki within the framework of the program “Funding for young researchers”. The materials were donated by SIKA Hellas and Interbeton.

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  1. Dept. of Civil Engineering, Aristotle University of Thessaloniki, 541 24, Thessaloníki, Greece

    Georgia E. Thermou, Konstantinos Katakalos & George Manos

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  1. Georgia E. Thermou
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  2. Konstantinos Katakalos
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  3. George Manos
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Correspondence to Georgia E. Thermou.

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Thermou, G.E., Katakalos, K. & Manos, G. Concrete confinement with steel-reinforced grout jackets. Mater Struct 48, 1355–1376 (2015). https://doi.org/10.1617/s11527-013-0239-6

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