Evaluation of Concrete Material Properties at Early Age

Obayes, Osamah; Gad, Emad; Pokharel, Tilak; Lee, Jessey; Abdouka, Kamiran

doi:10.3390/civileng1030021

Cited by 14 publications

(3 citation statements)

References 12 publications

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“…The values of the standard deviations and coefficients of variation (COV) show a relatively narrow spreading of the results around the median, with higher accuracies for Mix 2 and Mix 3. Similar values for the two statistical terms were reported in the scientific literature for the hardened properties of concrete and their variation with age [19].…”

Section: Static Modulus Of Elasticitysupporting

confidence: 84%

Influence of Concrete Strength Class on the Long-Term Static and Dynamic Elastic Moduli of Concrete

et al. 2021

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Construction materials, among which concrete is by far the most used, have followed a trend of continuously increasing demand in real estate. A relatively small number of research works have been published on the long-term material properties of concrete in comparison to studies reporting their findings at standard curing ages of 28 days. This is due, in part, to the length of time one must wait until the intended age of concrete is reached. The present paper contributes to filling this gap of information in terms of the strength and dynamic elastic properties of concrete. The dynamic modulus of elasticity may be used to assess the static modulus of elasticity (Young’s modulus), a key property used during the design stage of a structure, in a non-destructive manner. This paper presents the results obtained from laboratory tests on the long-term (6 years) characterization of concrete from the point of view of dynamic shear and longitudinal moduli of elasticity, dynamic Poisson’s ratio, static modulus of elasticity, compressive and tensile splitting strengths, and their change depending on the concrete strength class.

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Section: Static Modulus Of Elasticitysupporting

confidence: 84%

Influence of Concrete Strength Class on the Long-Term Static and Dynamic Elastic Moduli of Concrete

et al. 2021

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“…The results provided in [35] for predicting the development of mechanical features (elasticity modulus, compressive strength, etc.) in conventional concrete over a specific time span show that fib Model Code 2010 [36] has lower derivation from the experimental results than other standards.…”

Section: Tensile Strength Stress Causing First Crack Appearance and U...mentioning

confidence: 99%

“…As the tensile strength is around 3 MPa [36] for specimens manufactured from normal concrete and around 8 MPa [37] for those manufactured from ultra-high-performance concrete (UHPC), it is evident that the tensile strength of CSFRC is about 400% higher than that of normal concrete and about 88% higher than that of UHPC. The results provided in [35] for predicting the development of mechanical features (elasticity modulus, compressive strength, etc.) in conventional concrete over a specific time span show that fib Model Code 2010 [36] has lower derivation from the experimental results than other standards.…”

Section: Tensile Strength Stress Causing First Crack Appearance and U...mentioning

confidence: 99%

Influence of Concrete Shrinkage on the Behavior of Carbon Short-Fiber-Reinforced Concrete (CSFRC) under Tension

et al. 2023

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Carbon short-fiber-reinforced concrete (CSFRC) is a novel material obtained by adding and mixing carbon fibers into fresh concrete. In this way, the concrete behavior is changed, and concrete no longer undergoes brittle failure under tension. Specifically, when concrete is reinforced with short carbon fibers, its tensile characteristics become similar to those of steel. For example, CSFRC exhibits a distinct ductility, enabling the concrete to withstand substantial damage before failure. This results in a higher energy dissipation capacity, which consequently also increases the tensile strength of the concrete. Accordingly, the tensile strength of CSFRC is about 400% higher than that of plain concrete and almost double that of UHPC. Because of the differences in mechanical performance compared to conventional concrete, extensive experimental and theoretical research is needed to characterize the behavior of CFRSC. Our main aim in this research is to investigate and describe the load bearing and deformation behavior of CSFRC, as well as the related damage processes.

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Influence of surface cracking, anchor head profile, and anchor head size on cast-in headed anchors in geopolymer concrete

Karmokar,

Moyheddin

2023

Front. Struct. Civ. Eng.

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In this study, the concrete cone capacity, concrete cone angle, and load–displacement response of cast-in headed anchors in geopolymer concrete are explored using numerical analyses. The concrete damaged plasticity (CDP) model in ABAQUS is used to simulate the behavior of concrete substrates. The tensile behavior of anchors in geopolymer concrete is compared with that in normal concrete as well as that predicted by the linear fracture mechanics (LFM) and concrete capacity design (CCD) models. The results show that the capacity of the anchors in geopolymer concrete is 30%–40% lower than that in normal concrete. The results also indicate that the CCD model overestimates the capacity of the anchors in geopolymer concrete, whereas the LFM model provides a much more conservative prediction. The extent of the difference between the predictions by the numerical analysis and those of the above prediction models depends on the effective embedment depth of the anchor and the anchor head size. The influence of concrete surface cracking on the capacity of the anchor is shown to depend on the location of the crack and the effective embedment depth. The influence of the anchor head profile on the tensile capacity of the anchors is found to be insignificant.

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Evaluation of Concrete Material Properties at Early Age

Cited by 14 publications

References 12 publications

Influence of Concrete Strength Class on the Long-Term Static and Dynamic Elastic Moduli of Concrete

Influence of Concrete Strength Class on the Long-Term Static and Dynamic Elastic Moduli of Concrete

Influence of Concrete Shrinkage on the Behavior of Carbon Short-Fiber-Reinforced Concrete (CSFRC) under Tension

Influence of surface cracking, anchor head profile, and anchor head size on cast-in headed anchors in geopolymer concrete

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