Damage Evolution of RC Beams Under Simultaneous Reinforcement Corrosion and Sustained Load

Shen, Jiansheng; Gao, Xi; Li, Bo; Du, Kun; Jin, Ruoyu; Chen, Wei; Xu, Yidong

doi:10.3390/ma12040627

Cited by 24 publications

(14 citation statements)

References 34 publications

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“…However, the influence of engineering environment on concrete durability is ignored [1,2]. As a result, concrete buildings are damaged by freeze-thaw cycles, wet-dry cycles, salt ion erosion, alkali-aggregate reactions, and so on [3][4][5], which seriously affect the normal benefits and safe use of the structure. The process is gradually deteriorating from the surface to the inside, which is intuitively expressed as the mass loss and strength of the concrete [6,7].…”

Section: Introductionmentioning

confidence: 99%

Proposed Constitutive Law of Uniaxial Compression for Concrete under Deterioration Effects

et al. 2020

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In order to study the ductile deformation characteristics and failure process of plain concrete under uniaxial compression, this paper proposes a new constitutive model. The new model was used to fit and analyze the constitutive curve of concrete under uniaxial compressive under various degradation forms and was compared with the traditional constitutive models. Finally, the new model was used to quantitatively analyze and predict the stress–strain curve of concrete in different degradation periods of a set of freeze–thaw measured data. The results show that, compared with the traditional constitutive model, the new model is simple in form and has few parameters, and the numerical value of the parameter can reflect the ductile deformation capacity of concrete. The fitting curve of the new model has the highest fitting degree with the measured stress–strain curve of concrete, and the goodness of fit (R2) is also the largest. The new model is suitable for fitting the stress–strain curve of concrete under uniaxial compression under various deteriorating forms, and the degree of fit between the constitutive prediction curve and the measured curve is high. It can be seen from the fitting results of the new model parameters that the ductile deformation capacity of concrete decreases first and then increases slightly, which is inconsistent with the law of gradual deterioration of strength. There is a minimum moment of ductility deformation capacity of concrete (MDC). The MDC of O-C40 concrete is about 114 freeze–thaw cycles, and the MDC of O-C50 concrete is about 116 freeze–thaw cycles; the degree of fit between the constitutive prediction curve and the measured curve is high. We hope that the improvement mentioned offers valid reference to the study of ductile deformation characteristics and failure process of compressed concrete under different deterioration forms.

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Section: Introductionmentioning

confidence: 99%

Proposed Constitutive Law of Uniaxial Compression for Concrete under Deterioration Effects

et al. 2020

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“…Li [11] tested the performance of RC beams under coupled sustained loading and reinforcement corrosion. The authors of this study [12] proposed a concrete damage plasticity model to simulate the damage evolution of RC beams under the coupled effect.…”

Section: Introductionmentioning

confidence: 99%

“…A Brownian motion simulation for the chloride diffusivity of concrete was conducted, which was verified through two sets of experimental results. He [12] established the relationship between chloride diffusion coefficient pore structure parameters, which was characterized by low-field nuclear magnetic resonance (NMR) spectroscopy. Liu proposed a multi-phase transport model to simulate the ionic (K + , Na + , Cl − , and OH − ) transport features in concrete composites containing various shaped aggregates.…”

Section: Introductionmentioning

confidence: 99%

Influence of Pore Size and Fatigue Loading on NaCl Transport Properties in C-S-H Nanopores: A Molecular Dynamics Simulation

Cao

Fang

et al. 2020

Materials

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The transport properties of chloride ions in cement-based materials are one of the major deterioration mechanisms for reinforced concrete (RC) structures. This paper investigates the influence of pore size and fatigue loading on the transport properties of NaCl in C-S-H nanopores using molecular dynamics (MD) simulations. Molecular models of C-S-H, NaCl solution, and C-S-H nanopores with different pore diameters are established on a microscopic scale. The distribution of the chloride ion diffusion rate and the diffusion coefficient of each particle are obtained by statistically calculating the variation of atomic displacement with time. The results indicate that the chloride ion diffusion rate perpendicular to C-S-H nanopores under fatigue loading is 4 times faster than that without fatigue loading. Moreover, the diffusion coefficient of water molecules and chloride ions in C-S-H nanopores increases under fatigue loading compared with those without fatigue loading. The diffusion coefficient of water molecules in C-S-H nanopores with a pore size of 3 nm obtained from the MD simulation is 1.794 × 10−9 m2/s, which is slightly lower than that obtained from the experiment.

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“…Energy conservation and carbon reduction have become a serious issue for human beings [1]. The durability of reinforced concrete (RC) is one of the most concerning issues for infrastructure around the world [2]. Sustainable development covers a wide range.…”

Section: Introductionmentioning

confidence: 99%

“…Compressive strength (CNS 10142-2-11, ASTM D695, 25 • C-7 days) 700-800 kg/cm 2(2) Bending strength (CNS 10142-2-10, ASTM D790, 25• C-7 days) 500-600 kg/cm 2 (3)Tensile strength (CNS 2335-3-2, ASTM D638, 25• C-7 days) 460 kg/cm 2(4) Strength of the adhesive between the primer and concrete: (ASTM D1002, 25• C-7 days) 100 kg/cm 2…”

mentioning

confidence: 99%

Discussion on the Reinforcement of Reinforced Concrete Slab Structures

et al. 2019

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Because of global environmental changes and the continued warming of the planet, the increase in carbon dioxide emissions has had a major impact on the environment. The development of zero-carbon buildings, the promotion of energy conservation and carbon reduction, and the concept of green environmental protection are regarded as important issues for humanity to achieve sustainable development. In Taiwan, the combination of moisture and high salt content in the environment, corrosion caused by chloride ions, and earthquakes often lead to the formation of crevices in buildings. These crevices can cause rebar oxidation and corrosion and even concrete structure damage or spalling. Conventional structural damages can be repaired with epoxy resin grout. However, such practices are incapable of removing the rusted components of the rebars inside the structures and thus subject the internal rebars to continuous oxidation in the original rust-covered environment. Components located deep within the structures would still swell as a result of continuous rebar oxidation and cause concrete breaking and spalling, making previous repair efforts ineffective. This study proposes an improved repair and retrofit technique that includes the removal of rust from oxidated rebar parts, by applying low viscosity epoxy resin to the slab base and allowing it to fully penetrate the concrete cracks and surface of the rebars inside, thus producing a protective layer and repairing the bond. Additionally, carbon-fiber reinforced plastic (CFRP) patches were adopted as repair materials and attached to the beams and slab (ceiling) surfaces. Angle steels were used at the edges and installed to connect the beams to the slab with chemical anchors. The gaps between the angle steels and the slab were filled with epoxy resin grouts. On the short side of the slab, small steel H-beams were installed 1 m apart as a means of retrofit. Because the epoxy resin expands by 8% after undergoing chemical reactions, it bonds perfectly with concrete, CFRP patches, and steel materials. Approximately 10 years have elapsed since the case-study was repaired using the proposed technique, and the retrofit effect has yielded excellent results to the present day, with no occurrence of internal swelling or spalling from rebar oxidation. The proposed retrofit technique can reduce construction costs, while ensuring effective repair and maintenance of structural safety, and extend the service life of structures.

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Damage Evolution of RC Beams Under Simultaneous Reinforcement Corrosion and Sustained Load

Cited by 24 publications

References 34 publications

Proposed Constitutive Law of Uniaxial Compression for Concrete under Deterioration Effects

Proposed Constitutive Law of Uniaxial Compression for Concrete under Deterioration Effects

Influence of Pore Size and Fatigue Loading on NaCl Transport Properties in C-S-H Nanopores: A Molecular Dynamics Simulation

Discussion on the Reinforcement of Reinforced Concrete Slab Structures

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