Experimental study on the effect of corrosion on shear strength of fibre-reinforced concrete beams

Taqi, Faten Y.; Mashrei, Mohammed A.; Oleiwi, Hayder M.

doi:10.1016/j.istruc.2021.06.006

Cited by 10 publications

(12 citation statements)

References 17 publications

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“…However, as the corrosion age increased, the SO 4 2− in acid rain solution gradually migrated into the concrete, and when the internal pores did not have enough space to accommodate the expansion products, micro-cracks formed quickly, resulting in a decrease of the compressive strength [ 22 ]. Meanwhile, fibers made the concrete increasingly dense inside and slowed down the damage to the concrete matrix caused by corrosion ions [ 23 ]. Thus, the ξ 1 corrosion age variation curve of the concrete specimens mixed with fibers was more stable than that of OPC.…”

Section: Resultsmentioning

confidence: 99%

Research on Damage and Deterioration of Fiber Concrete under Acid Rain Environment Based on GM(1,1)-Markov

Huang

Zhu

et al. 2021

Materials

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With steel fiber and basalt fiber volume dosing serving as variation parameters, a total of 200 d cycles of acid rain corrosion cycle tests were conducted on fiber concrete in this study. We selected three durability evaluation parameters to assess the degree of damage deterioration on fiber concrete, used scanning electron microscopy, mercury intrusion porosimetry, and a dimensional microhardness meter to analyze the concrete micromorphology, and established a GM(1,1)-Markov model for life prediction of its durability. Results reveal that the acid rain environment is the most sensitive to the influence of the relative dynamic elastic modulus evaluation parameter, and concrete has specimens that show failure damage under this parameter evaluation. Incorporation of fibers can reduce the amount of corrosion products inside the concrete, decrease the proportion of harmful pores, optimize the mean pore-size, and significantly improve the resistance to acid rain attack. Concrete with 2% steel fiber and 0.1% basalt fiber by volume has the least change in durability damage, and the predicted service life by GM(1,1)-Markov model is 322 d.

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Section: Resultsmentioning

confidence: 99%

Research on Damage and Deterioration of Fiber Concrete under Acid Rain Environment Based on GM(1,1)-Markov

Huang

Zhu

et al. 2021

Materials

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“…This section presents two beam specimens with dimensions of 100 × 150 × 1300 mm that were tested in the experimental study conducted by Taqi et al [20]. These beams have been used to simulate the shear behavior using the NLFE method based on the experimental results (e.g., the loaddisplacement curves, failure mode, and crack pattern).…”

Section: Presentation Of Beam Specimensmentioning

confidence: 99%

“…In order to induce shear failure, these two Figure 1. Detailed layout of beam specimens [20] steel rebars were anchored with 90-degree hooks, and four stirrups with a nominal diameter of 8 mm were placed outside the supports at both ends of the beam. The results obtained from the tension test showed that the yield and ultimate tensile strengths are 560 and 652 MPa for longitudinal rebars and 534 and 757 MPa for stirrups.…”

Section: Presentation Of Beam Specimensmentioning

confidence: 99%

“…However, until now, no model has been developed to predict the shear strength of corroded SFRC structures. Besides, Taqi et al [20] investigated the effect of steel corrosion for longitudinal reinforcement on the shear behavior of SFRC beams with and without pre-corroded steel fibers in a concrete matrix. This experimental study concluded that when steel fibers were added, ranging from 0.8% to 1.8% in volume fractions, the shear strength of corroded SFRC beams with or without corroded steel fiber was less than that of non-corroded beams, although adding 1.8% steel fibers improved the shear strength of both non-corroded and corroded beams.…”

Section: Introductionmentioning

confidence: 99%

“…As a result, this study will concentrate on the shear strength of corroded SFRC beams. First, the modeled beams were built and validated using the beam specimens tested in the experimental study of Taqi et al [20]. Then, after conducting a good validation for nonlinear finite element (NLFE) models for SFRC beams, a series of modeled beams was extended in a parametric study to assess the effect of critical design-oriented parameters on shear behavior (i.e., the concrete compressive strength, the bond strength loss, the corrosion degree, and the shear span-to-effective depth ratio).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Assessing the shear behavior of corroded steel fiber reinforced concrete beams without shear reinforcement using nonlinear finite element analysis

Tan

Thao

Van

et al. 2022

STCE

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The shear behavior of steel fiber reinforced concrete (SFRC) beams has been assessed in a large number of previous studies. However, the shear strength of corroded SFRC beams without shear reinforcement is still an unresolved topic. In this paper, the finite element models of non-corroded and corroded SFRC beams have been constructed and verified regarding load-displacement curves, crack patterns, and failure modes. Finally, a parametric study also was performed to assess the effect of essential design parameters on the shear strength of SFRC beams under corrosion attacks. The results show that the reinforcement corrosion degree and concrete compressive strength are the most influencing parameters on the shear strength of SFRC beams, followed by the shear span-to-depth ratio and the steel-reinforced ratio.

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Mechanical‐performance deterioration of RC segment of shield tunnel under high corrosion degree and the transformation of eccentric‐failure mode

Zhang,

2024

Structural Concrete

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Reinforcement corrosion in shield tunnel segments has an important impact on the structure's bearing capacity and failure mode. Generally, a shield tunnel structure is under small eccentric compression, but if the reinforcement corrosion develops sufficiently, then a transition occurs from small to large eccentric load state, thereby lowering the structural bearing capacity and endangering the safety of tunnel operation. In the study reported here, based on the compressive bending load characteristics of the shield lining structure, corrosion test columns with small eccentric loading were designed to simulate the actual force state of the tunnel lining, and the whole evolution process of their mid‐span strain, ultimate bearing capacity, and cracks under different corrosion degrees was analyzed. With increasing corrosion, the bearing capacity, concrete strain, and depth of the compressive zone of a test column decrease more and more rapidly, and at the maximum corrosion degree of 68.32%, the maximum reduction of bearing capacity is 53.23%. The tests show that the failure mode of a test column with high corrosion degree (≥46.25%) is transformed from small to large eccentric failure. Based on theoretical analysis of the normal section bearing capacity of reinforced concrete flexural members, a theoretical method is proposed for calculating the critical corrosion degree for the tunnel lining structure to transform from small to large eccentric failure. The theoretical calculation method is verified against finite‐element calculations, and the present research results offer theoretical support for the durability design and safety evaluation of shield tunnel lining structures.

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Experimental study on the effect of corrosion on shear strength of fibre-reinforced concrete beams

Cited by 10 publications

References 17 publications

Research on Damage and Deterioration of Fiber Concrete under Acid Rain Environment Based on GM(1,1)-Markov

Research on Damage and Deterioration of Fiber Concrete under Acid Rain Environment Based on GM(1,1)-Markov

Assessing the shear behavior of corroded steel fiber reinforced concrete beams without shear reinforcement using nonlinear finite element analysis

Mechanical‐performance deterioration of RC segment of shield tunnel under high corrosion degree and the transformation of eccentric‐failure mode

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