Confinement of concrete in double skin tubular members under axial compression loads

Salman, Wissam D.; Mansor, Ahmed Abdullah

doi:10.1007/s42107-020-00323-2

Cited by 11 publications

(3 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Sounds of an explosion of specimens were heard accompanied by a sudden drop in the applied load. RC columns confined by two layers of CFRG with fiber in GPA showed exhibited a failure to rupture the carbon fibers jackets in the first third of the specimen's length, the observed failure mode is typical and applies to the observed failure mode of circular confined RC columns [11][12][13].…”

Section: Failure Modes Of Rc Columns Under Axial Loadmentioning

confidence: 69%

Fibrous Geopolymer Adhesive Jackets for Confining of Reinforced Concrete Columns

Salman¹,

Salman²

2021

DJES

View full text Add to dashboard Cite

The strengthening and rehabilitation of reinforced concrete structures is an important issue all over the world. Fiber-reinforced composites (FRC) are mainly used for the strength and rehabilitation of concrete members. However, its use is limited due to its high price and environmental effects and its adoption of epoxy as an adhesive, where epoxy is considered inefficient at high temperatures and loses most of its properties. The solution to this problem leads to the use of low-cost locally available geopolymer adhesive paste, with the possibility of adding fibers to improve the mechanical properties. This paper presents the experimental results of the circular RC columns confined by carbon fiber reinforced geopolymer adhesive (CFRGA) with fibers at geopolymer adhesive (GPA). Variables included; Geopolymer adhesive with or without fibers and type of fiber added to GPA (micro steel fibers, carbon fibers, and polypropylene fibers) with the volumetric ratio of (2%, 0.4%, 0.2%), respectively. The results where it was found that confinement by carbon fiber reinforced fibrous geopolymer adhesive improved the columns compressive strength estimated by (215%) and the axial strain improved by (268%). When adding (micro steel fibers, carbon fibers, and polypropylene fibers) to the adhesive led to an improvement in the strength of about (16.1%, 8.4%, and 7.96%) respectively, compared with the confined RC column without fibers at (GPA). Finally, confinements by carbon fiber reinforced geopolymer adhesive are more suitable for use in strengthening and rehabilitation of RC columns in areas with a hot climate.

show abstract

Section: Failure Modes Of Rc Columns Under Axial Loadmentioning

confidence: 69%

Fibrous Geopolymer Adhesive Jackets for Confining of Reinforced Concrete Columns

Salman¹,

Salman²

2021

DJES

View full text Add to dashboard Cite

show abstract

“…This is readily supporting the definition of ductility index, which is to undergo considerable deflection prior to failure. From the above table it is clear that the deflection prior to failure load is increased with the increase of the thickness of the steel plate[15].…”

mentioning

confidence: 88%

Effect of Using Different Aspect Ratio of Longitudinal Steel Plates in Reinforced Concrete Beams

et al. 2021

View full text Add to dashboard Cite

In the past few years, new techniques have emerged using steel plates instead of traditional reinforcement in the reinforced concrete beams. This study deals with using a new method for reinforced concrete beams using steel plates instead of traditional steel bars with different thicknesses of (4, 5, and 6 mm) placed vertically inside the lower part of the beam. Four reinforced concrete beams were cast and tested under a two-point load. All beams had the same cross-sectional area of reinforcement and dimensions of 2100 mm in length, 350 mm in height, and 250 in width. The results showed that as the thickness of the steel plate increases, the samples would have greater resistance until more deflection is produced. In addition, there is a reduction in the crack load, ultimate load, and yield load when replacing reinforcing bars with steel plates. In which, a reduction in crack load by about 11.1, 15.5, and 22.2% plate thicknesses of 4,5,6 mm respectively, compared to reference beam that had a deformed steel bar (Dia. 16 mm). In addition, a reduction in yielding load was observed about 42, 53, and 60% for steel plate thickness of 4, 5, and 6 mm respectively, compared to the reference model. Finally, the cracks for all the steel plate specimens compared to reference specimens were wider and smaller.

show abstract

“…Most fibers are used: carbon, glass, and aramid. Generally, carbon fibers are the most widely used because of their high elastic modulus compared to glass fibers obtainable since 1959 [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on RC Columns Confined by Jacket with Geopolymer Adhesive

Hussien

Salman

2022

DJES

View full text Add to dashboard Cite

Columns are one of the important structural members of engineering buildings. The impairment of reinforced concrete columns is one of the important problems affecting most structures, therefore the confinement of columns by fiber-reinforced polymers (FRP) is necessary to improve its behavior such as its load capacity, compressive strength, and ductility. The FRP used in the confinement is modern and wide application composite material in the field of civil engineering, which is pasted by epoxy. The fast impairment of epoxy at high temperatures leads to its replacement with an effective adhesive: geopolymers. This study presents the test result of an experimental investigation on confinement of six square RC columns with dimension (100*100*600mm) with geopolymer jacket under axial load conditions. The parameter considered is the jacketing material used (carbon fiber, plastic mesh, steel wire mesh, jute fiber, glass fiber mesh). Results of the test showed that confinement could improve the stiffness of the column by using a different type of material. The confinement with a carbon fiber reinforced geopolymers jackets can enhance the strength of the column after applying axial loading and improvement the performance of columns, but it is expensive. Where the increase in the load improvement and deformation capacity was (1.59 and 1.97), respectively, and the most effective jacket material in terms of economic cost and best performance in confinement operation consisted of (plastic mesh and steel wire mesh) compared to other types of material, with load enhancement by (1.41 and 1.27) and deformation capacity by (1.86 and 1.50), respectively compared with unconfined RC columns. Finally, the confinement by a different type of fiber-reinforced geopolymer adhesive is the most effective and used in the repair and rehabilitation of RC in the area with high-temperature climates.

show abstract

Confinement of concrete in double skin tubular members under axial compression loads

Cited by 11 publications

References 11 publications

Fibrous Geopolymer Adhesive Jackets for Confining of Reinforced Concrete Columns

Fibrous Geopolymer Adhesive Jackets for Confining of Reinforced Concrete Columns

Effect of Using Different Aspect Ratio of Longitudinal Steel Plates in Reinforced Concrete Beams

Experimental Investigation on RC Columns Confined by Jacket with Geopolymer Adhesive

Contact Info

Product

Resources

About