Corrosion behavior and flexural performance of reinforced concrete/ultrahigh toughness cementitious composite (RC/UHTCC) beams under sustained loading and shrinkage cracking

Hou, Lei; Zhou, Bingxuan; Guo, Shang; Aslani, Farhad; Chen, Da

doi:10.1016/j.conbuildmat.2018.11.237

Cited by 35 publications

(7 citation statements)

References 30 publications

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“…The given heat values were normalized by the total weight of binders (cement + silica fume + GGBS). The first peak-which was not fully recorded (the test data started to record nearly 30 min after water addition)-was specifically due to the hydration of C 3 A which upon dissolution reacts with Ca 2+ and SO 4 − ions present in the liquid phase to form ettringite (AFt) [19]. At the end of the first peak, there was almost no dormant period as a result of the high amount of silica fume acting as nucleation sites for cement hydration as well as the high early strength effect of the superplasticizer used.…”

Section: Hydration Heatmentioning

confidence: 99%

“…As a result, the problems encountered in the production of mass concrete can also be seen in the case of UHPC structural members with reduced cross-sectional areas. Despite the expectation of perfect protection against rebar corrosion from UHPC, thermal or shrinkage-induced cracks can reduce corrosion resistance by disabling the advantages of the dense cementitious matrix that resists the ingress of harmful ions [2][3][4]. Therefore, researchers have given importance to the use of pozzolanic materials for reducing Portland cement dosage thereby limiting hydration heat and in accordance with both ecological and engineering concerns.…”

Section: Introductionmentioning

confidence: 99%

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Hydration heat, strength and microstructure characteristics of UHPC containing blast furnace slag

Yalçınkaya

Çopuroğlu

2021

Journal of Building Engineering

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Ultra-high performance concrete (UHPC) is an innovative cement-based composite with high mechanical performance under tensile and compressive loads, extremely low permeability, and excellent durability. Because of these features, UHPC has the potential to contribute to the development of new architectural perspectives and structural systems with prolonged service life; therefore, it is anticipated that the use of UHPC in cast-in-situ applications will increase in the near future. As a result of its high Portland cement dosage, the hydration heat of UHPC can be relatively high compared to that of conventional concrete. Thus, ground granulated blast furnace slag (GGBS) can be used in UHPC formulation for reducing Portland cement dosage thereby limiting hydration heat while also addressing ecological and engineering concerns. In the scope of this study, the effects of GGBS replacement (0%, 30%, and 60%) on the hydration heat, strength, and microstructural characteristics of UHPC were studied. Results showed that GGBS-bearing UHPCs are more sensitive to ambient temperature in respect to cumulative heat. 60% GGBS replacement reduced cumulative heat release by 36% and 28% at 20 • C and 35 • C respectively. So, the benefit of GGBS on reducing hydration heat is less pronounced in hot weather. Performance differences in strength depending on the replacement ratio were only noticeable on the first day of curing. Prolonged curing time and fiber inclusion eliminated strength differences. Microstructural investigations indicated that Ca(OH) 2 can be lowered up to 0.5%, and the Ca/Si ratio of the C-S-H phase was reduced below the value of 1.0 after 90 days of curing as a result of GGBS replacement.

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Section: Hydration Heatmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydration heat, strength and microstructure characteristics of UHPC containing blast furnace slag

Yalçınkaya

Çopuroğlu

2021

Journal of Building Engineering

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“…deterioration of the bond between the steel bars and concrete, which can also influence the strength, deformation capacity and ductility of RC flexural members. 3 The degradation of bond also reduces stiffness and increases deflections. 4 Nowadays, it becomes important to ensure that critical RC structures are blast-resistant due to the risks from explosions.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the lower‐density by‐products of the corrosion process exert an expansion on the surrounding concrete, eventually leading to cover cracking 2 . Likewise, corrosion leads to a deterioration of the bond between the steel bars and concrete, which can also influence the strength, deformation capacity and ductility of RC flexural members 3 . The degradation of bond also reduces stiffness and increases deflections 4 …”

Section: Introductionmentioning

confidence: 99%

Blast performance and analysis of reinforced concrete beams subjected to corrosion of the longitudinal reinforcement

Njeem

Aoude

Martı́n-Pérez

et al. 2022

Structural Concrete

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This research has investigated the effect of reinforcement corrosion on the flexural response of reinforced concrete beams subjected to blast loading. Five beams, with and without corrosion, were tested under blast loads using a shock‐tube. The corroded specimens were subjected to an accelerated corrosion regime prior to testing, with a mass loss of up to 22% in the longitudinal steel reinforcement over the mid‐span or full‐span regions. A companion set of two beams was tested under quasi‐static four‐point bending. The results from the static tests show that corrosion of the longitudinal reinforcement decreased the strength and ductility, and ultimately changed the failure mode from ductile to brittle. Under blast loading, the steel corrosion increased maximum displacements and support rotations, reduced blast capacity, increased damage and fragmentation, and led to more brittle failure as the % mass loss increased. The effects of corrosion on blast response were moderate when the steel was corroded over the full‐span region. Furthermore, the blast response of the beams was predicted using dynamic inelastic single‐degree‐of‐freedom (SDOF) analysis, with the resistance functions developed using 2D finite element modeling, while accounting for the reduction in steel stress–strain properties and corrosion‐induced cracking. The SDOF analysis showed acceptable results in terms of ability to predict maximum displacements of the flexural‐governed beams (corroded and un‐corroded).

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“…It was found that the recycled aggregate RC beams had more severe damage than the nature aggregate RC beams. Hou et al [ 28 ] investigated the corrosion behavior of reinforced concrete/ultra-high toughness cementitious composite (RC/UHTCC) beams under sustained loading and shrinkage cracking. The results indicated that the coupled effect of sustained loading can further aggravate the degradation in flexural capacity of corroded RC/UHTCC beams.…”

Section: Introductionmentioning

confidence: 99%

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

Shen

Gao

et al. 2019

Materials

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To accurately obtain the performance of concrete structures in coastal regions, it is necessary to correctly understand the damage evolution law of reinforced concrete (RC) members under real working conditions. In this paper, four RC beams, subjected to different levels of corrosion and sustained load, are first tested. Reinforcement corrosion coupled with sustained load increases the number and width of cracks at the soffit of beams but decreases their loading capacities. Crack width of the corroded beam under 50% of designed load is two times of that under 30% of designed load. Residual loading capacities of the corroded beams subjected to 30% and 50% of designed load are 87.5% and 81.8% of the control beam. A finite element model is developed for the corroded RC beams. Due to less confinement, concrete below and at the sides of reinforcements is subjected to a higher stress, compared to concrete above the reinforcements. Corrosion expansion of reinforcements is successfully modelled by a temperature-filed method, as it properly simulates the damage evolution of the corroded RC beams. As a result, concrete cracking, caused by the reinforcement corrosion, is well captured. Coupling reinforcement corrosion with sustained load significantly increases the damage level in RC beams, particularly for those subjected to a high sustained load. The whole damage evolution process of concrete cracking due to corrosion expansion under the coupling effect of sustained loading and environment can be simulated, thus providing a reference for the durability evaluation, life prediction, and numerical simulation of concrete structure.

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Corrosion behavior and flexural performance of reinforced concrete/ultrahigh toughness cementitious composite (RC/UHTCC) beams under sustained loading and shrinkage cracking

Cited by 35 publications

References 30 publications

Hydration heat, strength and microstructure characteristics of UHPC containing blast furnace slag

Hydration heat, strength and microstructure characteristics of UHPC containing blast furnace slag

Blast performance and analysis of reinforced concrete beams subjected to corrosion of the longitudinal reinforcement

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

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