Experimental approach to investigate creep-damage bilateral effects in concrete at early age

Farah, Mounia; Grondin, Frédéric; Alam, Syed Yasir; Loukili, Ahmed

doi:10.1016/j.cemconcomp.2018.11.022

Cited by 16 publications

(4 citation statements)

References 16 publications

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“…Damage affects the creep of concrete materials and components [14,15]. The study by Farah, M., et al showed a drop in Young's modulus and residual strength after creep loadings in partially damaged beams, implying the development of a state of weakness in beams subjected to an increasing creep load [16]. Cao et al studied concrete creep under corrosion and load coupling in a solution environment and found that the creep of columns increased with steel corrosion.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Method for Creep Analysis of Strengthened Fatigue-Damaged Concrete Beams

et al. 2023

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Fatigue-damaged concrete improves the load-bearing capacity of components by increasing the cross section. However, the creep performance of damaged components after the repair has received less attention. Thus, this study establishes a constitutive creep model of strengthened fatigue-damaged concrete on the basis of damage mechanics and numerically simulates the strengthened component. The accuracy of the proposed model is verified by conducting creep tests on fatigue-damaged concrete beams. According to the numerical simulation results, increasing the section height profoundly affects the ability to control their creep deflection. The incremental creep deflection of the beams with a strengthened section height of 50, 100, and 150 mm loaded for 365 days decreased by 0.107, 0.228, and 0.326 mm, respectively, compared with the unstrengthened damaged beam. Moreover, this reinforcement method excellently controls the deflection of the damaged components under a negative bending moment. The model can forecast the creep deformation of undamaged components or damaged components after being strengthened, which facilitates structural maintenance and decision-making about reinforcement.

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Section: Introductionmentioning

confidence: 99%

“…For the material constitutive model defined by the user subroutine, it is necessary to calculate the stress increment (∆ σ n ) through the strain increment (∆ε n ) imported by the main program. Without considering the temperature strain, Equation (16) expresses the relationship between the stress increment and the strain increment:…”

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confidence: 99%

Numerical Method for Creep Analysis of Strengthened Fatigue-Damaged Concrete Beams

et al. 2023

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“…Liu et al [ 24 ] found that multiaxial compression caused by early temperature rise in mass concrete can strengthen concrete and reduce tensile cracks. Farah et al [ 25 ] conducted early bending creep tests on concrete beams and found that the Young’s modulus and residual strength of partially damaged beams decrease under creep load. Østergaard et al [ 26 ] found that the concrete will show higher tensile creep strain if it is loaded at the age of less than or equal to one day.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Mechanical Properties of Concrete at Super-Early Age

2022

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Few studies have reported the cohesion and friction angle of concrete at a super early age. However, these two mechanical parameters are necessary to study the influence of engineering vibration on super-early-age concrete. In view of this, the mechanical properties of the super-early age-concrete are investigated in this work by direct shear testing. Firstly, the shear strength of the super-early-age concrete is measured by the direct shear experiment under different normal pressures at different times. Secondly, the cohesion and friction angle of the super early age concrete are calculated according to the Mohr–Coulomb criterion of failure. To overcome the great discreteness and randomness in the measured data, a new robust regression analysis algorithm is presented to replace the traditional regression analysis method to obtain more reliable and reasonable mechanical parameters. According to the experimental and theoretical analysis results, it is found that the friction angles of the super early age concrete are located in the interval of [50°, 70°]. The cohesion of the concrete is about 78.7 kPa at the initial setting state and about 190.9 kPa at the final setting state, respectively. It has been shown that the cohesion of the concrete at a super-early age tends to increase rapidly with time. The method and test results of this work can be used as a reference for relevant engineering practice. Specifically, the proposed regression method can be extended to the data analysis of other mechanical parameters of concrete, as well as other brittle materials such as rock. The test results of early concrete cohesion and friction angle can be used to analyze the adverse effects of vibration on newly cast concrete members in pile driving and blasting engineering.

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“…Most of the creep and shrinkage develops in the first decade after construction. Afterward, developed strains are not expected to impact the structural performance significantly [7][8][9][10][11]. The creep in concrete structures can substantially influence the lifespan of the structure.…”

Section: Introductionmentioning

confidence: 99%

Creep and Shrinkage Behaviour of Disintegrated and Non-Disintegrated Cement Mortar

et al. 2021

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One way to prevent cement from ending up in landfills after its shelf life is to regain its activity and reuse it as a binder. As has been discovered, milling by planetary ball mill is not effective. Grinding by collision is considered a more efficient way to refine brittle material and, in the case of cement, to regain its activity. There has been considerable research regarding the partial replacement of cement using disintegrated cement in mortar or concrete in the past few decades. This article determines and compares the creep and shrinkage properties of cement mortar specimens made from old disintegrated, old non-disintegrated, and new non-disintegrated Portland cement. The tests show that the creep strains for old disintegrated and old non-disintegrated cement mortars are close, within a 2% margin of each other. However, the creep strains for new non-disintegrated cement mortar are 30% lower. Shrinkage for old disintegrated and non-disintegrated cement mortar is 20% lower than for new non-disintegrated cement mortar. The research shows that disintegration is a viable procedure to make old cement suitable for structural application from a long-term property standpoint. Additionally, it increases cement mortar compressive strength by 49% if the cement is disintegrated together with sand.

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Experimental approach to investigate creep-damage bilateral effects in concrete at early age

Cited by 16 publications

References 16 publications

Numerical Method for Creep Analysis of Strengthened Fatigue-Damaged Concrete Beams

Numerical Method for Creep Analysis of Strengthened Fatigue-Damaged Concrete Beams

Experimental Study on Mechanical Properties of Concrete at Super-Early Age

Creep and Shrinkage Behaviour of Disintegrated and Non-Disintegrated Cement Mortar

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