Compressive behaviour of stub concrete column strengthened with ultra-high performance concrete jacket

Xie, Jianwen; Fu, Quanhong; Yan, Jia‐Bao

doi:10.1016/j.conbuildmat.2019.01.220

Cited by 77 publications

(31 citation statements)

References 25 publications

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“…In the case of the results obtained from the measurements between stages 2 and 3, and 3 and 4, there are differences in the stiffness change of beams #2 and #3. For example, the drops of the dynamic Young's moduli are greater in beam #2 between stages 3 and 4 (when the load-bearing capacity of the beams was used in about 50%), and reach 12% and 19% at the top and bottom of the Based on the measurements of the longitudinal wave velocities shown in Figures 30-33, Figure 34 presents a diagram of the average dynamic changes of the Young's moduli of the concrete along the height of the middle section of beams #2 and #3, estimated according to Equation (8). In the diagram shown in Figure 34, it can be seen that the relative stiffness decreases in the dynamic Young's modulus relative to the virgin state are similar in both beam #2 and beam #3 between loading stages 1 and 2 (when the bending resistance of the beams was used in about 12.5%), and they are approximately 5-7%.…”

Section: Beams #2 and #3mentioning

confidence: 99%

“…A number of already successful UHPC and UHPFRC applications in practice, and their high strength and durability, continue to lead many researchers to undertake research proposing various innovative structural solutions using such materials, including their use for strengthening existing structures. In this respect, concrete beam structures [5,6,[10][11][12][13]19,20,[29][30][31][32][33], as well as columns [8,34,35] and slabs [9,36] have mainly been examined. In addition, analytical [12,29,33,36] and numerical [6,11,19,20,30,32] models of elements containing UHPC or UHPFRC have been verified or validated, the properties of this material have been tested for use in repairs [14,37], and the possibilities of the modern monitoring of the structural elements which contain it have been tested [12].…”

Section: Introductionmentioning

confidence: 99%

“…For example, for RPC of strength class 200, its tensile strength is on average 30–60 MPa, its Young’s modulus is 50–60 GPa, its fracture energy is 20–40 kJ/m 2 , and its ultimate tensile strain is 0.005–0.007 [ 1 ]. To this day, a number of subsequent studies of various varieties of UHPC and UHPFRC have been carried out, whose formulas were based on the RPC concept according to [ 1 ], primarily focusing on their strength characteristics (e.g., [ 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 ]), as well as other important properties (e.g., deformability [ 3 , 5 , 6 , 8 , 11 , 12 , 14 , 16 , 17 , 18 , 19 , 20 ], porosity [ 16 , 17 ], freeze-thaw durability [ 14 , 18 ], workability [ 9 , 13 , 18 ], resistance to projectile penetration [ 21 ], parameters of fracture mechanics [ 7 , 12 , 16 ], creep [ 10 , 22 ], shrinkage [ 6 , 22 ], adhesion to ordinary concrete […”

Section: Introductionmentioning

confidence: 99%

“…Summary diagram of the average changes of the velocity of the longitudinal waves along the height of the middle section of beams #2 and #3, calculated according to Equation(8).…”

mentioning

confidence: 99%

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Experimental Research on Concrete Beams Reinforced with High Ductility Steel Bars and Strengthened with a Reactive Powder Concrete Layer in the Compression Zone

et al. 2020

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The article describes four-point bending tests of three reinforced concrete beams with identical cross-sections, spans, and high-ductility steel reinforcement systems. Two beams were strengthened in the compressed section with a thin layer of reactive powder concrete (RPC) bonded with evenly spaced stirrups. Their remaining sections, and the third reference beam, were made of ordinary concrete. Measurements of their deflections, strains and axis curvature; ultrasonic tests; and a photogrammetric analysis of the beams are the main results of the study. For one of the beams with the RPC, the load was increased in one stage. For the two remaining beams, the load was applied in four stages, increasing the maximum load from stage to stage in order to allow the analysis of the damage evolution before reaching the bending resistance. The most important effect observed was the stable behaviour of the strengthened beams in the post-critical state, as opposed to the reference beam, which had about two to three times less energy-absorbing capacity in this range. Moreover, thanks to the use of the RPC layer, the process of concrete cover delamination in the compression zone was significantly reduced, the high ductility of the rebars was fully utilized during the formation of plastic hinges, and the bending capacity was increased by approximately 12%.

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Section: Beams #2 and #3mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Summary diagram of the average changes of the velocity of the longitudinal waves along the height of the middle section of beams #2 and #3, calculated according to Equation(8).…”

mentioning

confidence: 99%

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Experimental Research on Concrete Beams Reinforced with High Ductility Steel Bars and Strengthened with a Reactive Powder Concrete Layer in the Compression Zone

et al. 2020

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“…Over the past years, a lot of research has been done in terms of strengthening concrete columns by fibrous concrete, but this research has been limited in the used variables. In 2019, Xie et al [41], presented an experimental investigation concerning strengthening the concrete column by ultra-high-performance concrete (UHPC) jacket. Outcomes of this study presented that the UHPC jacket affected the behavior of a concrete column which increased the ultimate stress capacity, maximum displacement, and ductility.…”

Section: Introductionmentioning

confidence: 99%

Effect of Fibrous Jacket on Behavior of RC Columns

Jassim

Chassib

2020

Civ Eng J

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This paper presented an extensive study about the strengthening of RC square short columns with high strength concrete jackets reinforced with steel fiber. The aim of this study is to investigate the effect of confinement by fibrous jacket on the behavior of RC column. A comparative study is performed on 23 square columns (six of them were unconfined columns where the remaining seventeen were confined columns) with varied parameters such as steel fibers ratio and type, jacket thickness, partial and full strengthening, type of confining jacket (hoop and composite), use of epoxy as bond material between the concrete column and strengthening jacket, and length parameter. The test results showed that the strengthened columns showed a significant improvement in the ultimate stress, load-carrying capacity, maximum strain, ductility, and energy absorption. Increase the steel fibers ratio (1, 1.5 and 2%) increased the ultimate stress by (22.5, 12.3 and 12.5%) respectively. The use of epoxy as bond material enhanced the ultimate stress by an average improvement by (55%). Composite case in the strengthening enhanced the load-carrying capacity larger than hoop case by (28.7 and 42%) for FRC jackets with hooked and straight fibers respectively but in case of stress capacity, hoop jacket carries stresses more than composite according to the stressed cross-sectional area. Increase jacket thickness (25 and 35 mm) enhanced the ultimate stress by (28.7 and 15.5%) respectively. Partial strengthening has a good enhancement in the ultimate load but was less than full strengthening. Increase the length by (25 cm) decreased the enhancement in load capacity of the column with hoop jacket by (45.3%). Concrete jackets enhanced Energy absorption and ductility which improved the deformation capacity. The compressive behavior of stub concrete columns was also modeled, simulated, and analyzed numerically by a 3D nonlinear finite element model. The verification process was performed against the reported data of the experimental test which proved the results of experimental results and showed a good agreement between experimental and numerical outcomes.

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Concrete Strength Enhancement due to High‐Performance Fibre‐Reinforced Concrete Jacketing Solution

Betar,

Wagner,

Morbi

2023

ce papers

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High‐Performance Fibre‐Reinforced Concrete (HPFRC) jacketing technique provides a sustainable solution to the constantly growing infrastructure degradation. This paper investigates the effect of HPFRC jacketing solution on strength enhancement of plain concrete. The experimental work included 23 samples, 15 of which were jacketed with HPFRC, and the remaining 8 were used to measure the unconfined strength. The key parameters were jacket thickness (25 mm, 35 mm, and 45 mm) and pre‐damage level (40% and 80%). The results show that jacketed columns exhibit a ductile behaviour. It is found that a 25 mm HPFRC jacket increases the compressive strength by 31%. Moreover, increasing the jacket thickness further enhances the compressive strength. However, the enhancement rate gradually decreases with increasing the jacket thickness. The results from sensor technology used on each concrete layer revealed that the lateral strain of jacketed concrete at a given axial strain was greater than that of unjacketed concrete, indicating an increased rate of dilation for the jacketed concrete. The results show that strengthening of existing columns at their mid‐service life (i.e., 40% pre‐damaged) is as effective as strengthening of new columns. The obtained knowledge suggests that HPFRC jacketing solution has a great potential to revolutionise infrastructure rehabilitation techniques.

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Compressive behaviour of stub concrete column strengthened with ultra-high performance concrete jacket

Cited by 77 publications

References 25 publications

Experimental Research on Concrete Beams Reinforced with High Ductility Steel Bars and Strengthened with a Reactive Powder Concrete Layer in the Compression Zone

Experimental Research on Concrete Beams Reinforced with High Ductility Steel Bars and Strengthened with a Reactive Powder Concrete Layer in the Compression Zone

Effect of Fibrous Jacket on Behavior of RC Columns

Concrete Strength Enhancement due to High‐Performance Fibre‐Reinforced Concrete Jacketing Solution

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