Strengthening of RC Structures by Using Engineered Cementitious Composites: A Review

Shang, Xingyan; Yu, Jiangtao; Li, Lingzhi; Lu, Zheng

doi:10.3390/su11123384

Cited by 46 publications

(18 citation statements)

References 66 publications

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“…Several studies have investigated the effectiveness of SHCC concrete hybrid systems for different structural members, for example shear strengthening by placing SHCC on sides of a beam [5,6] and flexural strengthening by placing SHCC at the tension side [7]. An overview of strengthening applications can be seen in [8]. These studies, along with the study on new hybrid system [9], demonstrate the promising application of hybrid structures by highlighting the increase in load-carrying capacity.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation on the role of interface for crack-width control of hybrid SHCC concrete beams

Mustafa

Singh

Hordijk³

et al. 2022

Engineering Structures

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Hybrid application of conventional concrete and Strain Hardening Cementitious Composite (SHCC) is recently shown to be promising for crack width control. In this paper, a combined experimental and numerical study is performed to validate the concept and to study the effect of interface treatment on crack width control. The interface is varied between smooth, profiled, partially debonded and completely debonded surfaces. The beams are tested under a four-point bending configuration. The crack development is monitored using digital image correlation throughout the loading, and maximum crack width of 0.3 mm at the surface is taken as the limiting criterion for analyses. The hybrid and control beams are simulated using the lattice model. Both experimentally and numerically, it is observed that stronger interfaces enable the composite action in the hybrid beams and provide better crack width control compared to the artificially weakened interfaces.

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Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation on the role of interface for crack-width control of hybrid SHCC concrete beams

Mustafa

Singh

Hordijk³

et al. 2022

Engineering Structures

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“…In these studies, lateral load resistance and deformation capacity were improved as a result of the high tensile properties of the retrofitting material. In a state-of-the art review of strengthening applications with ECC, Shang et al 2019 [23] concluded that the strain-hardening property of ECC renders it an ideal retrofitting material; the interfacial resistance is adequate to ensure monolithic behavior between core and jacket, which is a finding that is also supported by inclined interface shear tests between plain and ECC concrete, particularly if the substrate is roughened prior to the strengthening application. It is also worth mentioning that the results of the present work are in line with the findings of Papavasileiou et al 2020 [24], who demonstrated that implementing a thin jacket layer to a deficient member is an effective retrofit technique that can be competitive to other strengthening methods (such as conventional thicker jackets or bracings at frame bays), provided that the thin jacket is composed of appropriate material(s) to develop sufficient confinement of the core and the additional strength required for the retrofitted member.…”

Section: Envelope Resistance Curvesmentioning

confidence: 99%

Experimental Investigation of ECC Jackets for Repair of Pre-Damaged R.C. Members under Monotonic Loading

et al. 2021

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With the advent of strain-hardening cementitious composites (SHCC), an opportunity for alternative jacketing solutions is presented, where the internal confinement exerted by the fibers in the material may effectively encase the structural component, thereby enhancing the strength and deformation capacity in the critical regions. This concept is explored in the present paper through testing of four pre-damaged prismatic flexural reinforced concrete members with various reinforcing deficiencies. Thin SHCC jackets constituted of a fiber-reinforced Engineered Cementitious Composite (ECC) are used to replace the damaged cover without any additional confining reinforcement. An advantage of cover replacement is that strengthening is achieved without altering the dimensions of the members. The experimental results documented the SHCC jackets’ effectiveness as a rehabilitation strategy, enhancing both the strength and ductility of the retrofitted elements and mitigating the deficiency in transverse reinforcement detailing. The strength recovery showed that the cover-thin SHCC jacket sufficed to enhance flexural and shear resistance through confinement and mobilization of stress transfer at the interface with the encased core.

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“…A new material Engineered Cementitious Composites (ECC) having many favourable properties such as damage tolerance, delamination resistance, etc. It has been found very effective in improving the interfacial bond performance with the substrate concrete [4]. Use of ECC in combination with high-strength polyethylene fibres to develop fibre RC jackets was examined [24].…”

Section: Literature Reviewmentioning

confidence: 99%

“…Several techniques for strengthening the existing buildings, such as enhancing the stiffness, improving discontinuity or irregularity in the distribution of stiffness of a building, have been examined and analysed in recent years. In the construction field, Reinforced Concrete (RC) is still the most widely used material being used [4]. Load bearing members such as beam and column largely utilises concrete and steel.…”

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confidence: 99%

Investigation of reinforced concrete jacketed columns under different loading conditions

Anand¹,

Sinha²,

Kumar³

2021

IJATEE

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Existing buildings may need to be strengthened to avoid the damage related to structures due to an increase in floor loads, inadequate detailing, a timely revision of design codes, etc. [1−3]. Retrofitting requires modifying an existing structure to make it more durable and resilient for the desired use. Several techniques for strengthening the existing buildings, such as enhancing the stiffness, improving discontinuity or irregularity in the distribution of stiffness of a building, have been examined and analysed in recent years. In the construction field, Reinforced Concrete (RC) is still the most widely used material being used [4]. Load bearing members such as beam and column largely utilises concrete and steel. But, due to poor construction practices and deterioration of materials, such members sometimes need to be strengthened. This paper covers the strengthening of RC columns. Various techniques such as RC jacketing, steel jacketing, Fibre Reinforced Polymer (FRP) jacketing exist which are being used worldwide to strengthen the columns [2]. *Author for correspondence One of the most influential techniques to retrofit the column is RC jacketing. This type of strengthening improves the axial, shear strength, and flexural capacity of columns, however, the increase in ductility is relatively less [2]. Secondly, it is easy to construct and install, therefore, is the most widely used technique of retrofitting all over the world. Besides RC jacketing, steel jacketing is also a widely used technique to strengthen the columns. Seismic performance of RC columns strengthened by externally wrapping the steel plates resulted in an increased bearing capacity of about 80% than the unstrengthened column [5]. The use of steel tubes as a retrofitting tool on the slender RC column has been proven to be very effective in enhancing the load bearing capacity, ductility and stiffness [6]. The effect of steel jacketing on the seismic performance of a 6 story RC building by jacketing the columns was investigated [7]. The results of the same indicated that the axial and flexural strength of an individual column increases by 184% and 261%, respectively, whereas the lateral strength of the building increases by 127% and 74% along X and Y direction respectively. Apart from RC and steel jacketing, another technique that has become the hotspot of strengthening practices is

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Strengthening of RC Structures by Using Engineered Cementitious Composites: A Review

Cited by 46 publications

References 66 publications

Experimental and numerical investigation on the role of interface for crack-width control of hybrid SHCC concrete beams

Experimental and numerical investigation on the role of interface for crack-width control of hybrid SHCC concrete beams

Experimental Investigation of ECC Jackets for Repair of Pre-Damaged R.C. Members under Monotonic Loading

Investigation of reinforced concrete jacketed columns under different loading conditions

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