Improving the performance of UHPC columns exposed to axial load and elevated temperature

El-Sayed, Taha A.

doi:10.1016/j.cscm.2021.e00748

Cited by 7 publications

(3 citation statements)

References 18 publications

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“…5 A huge amount (772 metric tons) of wheat is grown around the globe, which produces a large sum of waste, polluting the environment. Wheat straw ash (WSA) is made from farming waste and because [6][7][8] it has binding attributes it could be efficiently utilized in concrete to replace cement, which can help the environment and improve the economy of any country. 9 WSA has pozzolanic behavior and enhances the resistance against corrosion, and significantly improves the workability and strength of concrete.…”

Section: Introductionmentioning

confidence: 99%

Retraction: To evaluate the performance of waste marble powder and wheat straw ash in steel fiber reinforced concrete

Zaid

Aslam

Alabduljabbar

2021

Structural Concrete

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In developing countries, cement is one of the most consumed materials, which leads to a huge quantity of emission of carbon dioxide (CO 2 ) gas into the atmosphere. Cement could be replaced with materials that have pozzolanic properties and filler ability such as wheat straw ash (WSA). The focus of the present research is to substitute cement with WSA and fine aggregate with waste marble powder (WMP) in different doses ranging from 0% to 20% and 0% to 30% with 1.5% hooked end steel fibers in concrete. To evaluate different characteristics of concrete made with WSA, WMP and steel fibers, tests such as compressive, split tensile and flexural strength, sorptivity, water absorption and microstructural analysis were performed, From the lab results, it was revealed that the optimum dosage for concrete with improved properties was 15% WSA, 30% WMP, and 1.5% steel fibers. An improvement of 43.5%, 59%, and 45.96% was observed in compressive, split tensile, and flexural strength. Water absorption and sorptivity were reduced by 15.9% and 29% with the addition of WSA

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Section: Introductionmentioning

confidence: 99%

Retraction: To evaluate the performance of waste marble powder and wheat straw ash in steel fiber reinforced concrete

Zaid

Aslam

Alabduljabbar

2021

Structural Concrete

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“…[4][5][6] When flexural members of the reinforced concrete are subjected to heating conditions, extreme wear and tear, and large unwanted deformations occur. 7,8 This is due to the loss of concrete's stiffness which softens and cracks the concrete's members, degrades the strength characteristics, and leads to the softening of steel rebars in the concrete members. 9,10 When the concrete is subjected to extreme temperatures, the steel rebars are distorted; thus, replacing these damaged steel rebars becomes essential.…”

Section: Introductionmentioning

confidence: 99%

“…Usually, the failure of concrete when subjected to fire is prominent because of the degradation of the binder's elements, hydration of binder, release of entrapped water in the concrete matrix, and inconsistent thermal behavior of fine and coarse aggregates 4–6 . When flexural members of the reinforced concrete are subjected to heating conditions, extreme wear and tear, and large unwanted deformations occur 7,8 . This is due to the loss of concrete's stiffness which softens and cracks the concrete's members, degrades the strength characteristics, and leads to the softening of steel rebars in the concrete members 9,10 .…”

Section: Introductionmentioning

confidence: 99%

Rehabilitation of post‐heated rectangular reinforced concrete columns using different strengthening configuration

Abadel

2023

Structural Concrete

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It is common knowledge that increased temperatures have a negative impact on the axial load‐capacity and stiffness of reinforced concrete (RC) rectangular columns. This is something that is commonly acknowledged. For the purpose of restoring the axial capacity and stiffness of heat‐damaged RC columns, it is absolutely essential to carefully pick a suitable method for strengthening and repairing the columns. This research paper investigates the performance of various strengthening methods, such as the use of carbon fiber‐reinforced polymer (CFRP) jackets with near‐surface mounted (NSM) steel bars and a combination of welded wire mesh (WWM) and CFRP strengthening techniques, for the rehabilitation of RC rectangular columns that have been damaged due to exposure to high temperatures. Specifically, the paper focuses on the performance of these methods in relation to the rehabilitation of RC rectangular columns. There were three groups of tested RC rectangular columns: pre‐heated and unstrengthened, post‐heated and unstrengthened, and post‐heated and strengthened. Over a period of 3 h, 600°C was applied to the heated columns. Both a scheme utilizing a combination of unidirectional CFRP strips and NSM steel bars and another utilizing a combination of unidirectional CFRP strips and WWM were evaluated. Axial compression tests were performed on each column until failure occurred. The experimental test outcomes revealed that exposure to high elevated temperatures led to a decrease in the axial load‐carrying capacity of 38.6% and a decrease of 75.9% in initial stiffness, compared to unheated RC columns. Both strengthening schemes proved effective in restoring and surpassing the initial load‐carrying capacity of undamaged RC rectangular columns by an average of 35%. Notably, the combination of CFRP strips and WWM exhibited superior performance in restoring the initial stiffness of post‐heated RC rectangular columns, representing a novel finding. The strengthening scheme employing WWM and CFRP recovered 61.3% of the lost axial strength caused by high temperature, while the NSM/CFRP scheme restored 34.5% of the lost axial strength. In addition, the utilization of NSM in combination with CFRP strips as well as utilization of the WWM and CFRP systems leads to stiffness enhancement of 52.1% and 123.7%, respectively, when compared to post‐heated and unstrengthened RC columns. However, the study's findings have clearly shown that combination of WWM and CFRP strips is efficient in enhancing the strength of heated and unheated damage RC beams.

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Flexural behavior of long-term loaded RC beams strengthened by ultra-high performance concrete

Zhu,

Abdelbaset,

et al. 2023

Construction and Building Materials

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Improving the performance of UHPC columns exposed to axial load and elevated temperature

Cited by 7 publications

References 18 publications

Retraction: To evaluate the performance of waste marble powder and wheat straw ash in steel fiber reinforced concrete

Retraction: To evaluate the performance of waste marble powder and wheat straw ash in steel fiber reinforced concrete

Rehabilitation of post‐heated rectangular reinforced concrete columns using different strengthening configuration

Flexural behavior of long-term loaded RC beams strengthened by ultra-high performance concrete

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