Workability and Mechanical Properties of Heavyweight Magnetite Concrete

Yang, Keun–Hyeok; Mun, Ju–Hyun; Lee, Ho

doi:10.14359/51686570

Cited by 10 publications

(17 citation statements)

References 5 publications

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“…e existing models for the strain-stress relationship proposed by Markeset and Hillerborg [6] and Samani and Attard [7] were selected as summarized in Table 2. Figure 10 shows comparisons of the predicted and measured stress-strain curves [4,[19][20][21][22][23][24][25]. e comparative analysis focused on the e ect of d eq , h/d eq , ρ c , and f c ′ on the stress-strain curve.…”

Section: Comparisons With Test Resultsmentioning

confidence: 99%

“…Hence, the accuracy of Markeset and Hillerborg's model [6] according to the concrete type uctuates with large deviations. e values of c m obtained by Markeset and Hillerborg's model [6] Yang et al [23] f ′ SE = 28.9-50. Markeset and Hillerborg's model [6] underestimates the compressive stress of HWC.…”

Section: Samani Andmentioning

confidence: 94%

“…E c 8470(f c ′ ) 1/3 (ρ c /2300) 1.17 Ascending branch Yang et al [23] f ′ SE = 28.9-50. Advances in Materials Science and Engineering deviation of the NRMSE, respectively.…”

Section: Samani Andmentioning

confidence: 98%

“…ese imply that the descending branch behavior in the stress-strain relationship for uncon ned concrete is considerably affected by the functions of d eq , h/d eq , and ρ c . Based on this analysis, ε SE0.5 − (ε SE − (f SE ′ /E c )) was generalized as functions of G F , f SE ′ , h/d eq , and ρ c (Figure 8), using regression analysis from the test results [4,5,[12][13][14][15][19][20][21][22][23][24][25][26][27][28][29] for 45 data records for LWC, 91 data records for NWC, and 24 data records for HWC:…”

Section: Determination Of βmentioning

confidence: 99%

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A Stress-Strain Model for Unconfined Concrete in Compression considering the Size Effect

Yang

Lee

2019

Advances in Materials Science and Engineering

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In this study, a stress-strain model for unconfined concrete with the consideration of the size effect was proposed. The compressive strength model that is based on the function of specimen width and aspect ratio was used for determining the maximum stress. In addition, in stress-strain relationship, a strain at the maximum stress was formulated as a function of compressive strength considering the size effect using the nonlinear regression analysis of data records compiled from a wide variety of specimens. The descending branch after the maximum stress was formulated with the consideration of the effect of decreasing area of fracture energy with the increase in equivalent diameter and aspect ratio of the specimen in the compression damage zone (CDZ) model. The key parameter for the slope of the descending branch was formulated as a function of equivalent diameter and aspect ratio of the specimen, concrete density, and compressive strength of concrete. Consequently, a rational stress-strain model for unconfined concrete was proposed. This model reflects trends that the maximum stress and strain at the peak stress decrease and the slope of the descending branch increases, when the equivalent diameter and aspect ratio of the specimen increase. The proposed model agrees well with the test results, irrespective of the compressive strength of concrete, concrete type, equivalent diameter, and aspect ratio of the specimen.

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Section: Comparisons With Test Resultsmentioning

confidence: 99%

Section: Samani Andmentioning

confidence: 94%

“…E c 8470(f c ′ ) 1/3 (ρ c /2300) 1.17 Ascending branch Yang et al [23] f ′ SE = 28.9-50. Advances in Materials Science and Engineering deviation of the NRMSE, respectively.…”

Section: Samani Andmentioning

confidence: 98%

Section: Determination Of βmentioning

confidence: 99%

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A Stress-Strain Model for Unconfined Concrete in Compression considering the Size Effect

Yang

Lee

2019

Advances in Materials Science and Engineering

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“…The test results compiled from the available literatures [4,5,[12][13][14][15][16][17][18][19][20][21][22][23][24][25] were compared with predictions of this study and the existing models [1,6,7,11]. The existing models for the strainstress relationship proposed by Markeset and Hilleborg [6], and Samani and Attard [7] were selected as summarized in Table 2.…”

Section: Comparisons With Test Resultsmentioning

confidence: 99%

A Stress-Strain Model for Unconfined in Compression Considering the Size Effect

Yang¹,

Lee²,

Mun³

2018

Preprint

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In this study, the model proposed by Yang et al. to generalize the stress–strain model for unconfined concrete with consideration of the size effect is expanded. Sim et al.’s compressive strength model that is based on the function of specimen width and aspect ratio was used for the maximum stress. In addition, a strain at the maximum stress was formulated as a function of compressive strength by considering the size effect using the regression analysis of datasets compiled from a wide variety of specimens. The descending branch after the peak stress was formulated with consideration of less dissipated area of fracture energy with the increase in specimen width and aspect ratio in the compression damage zone (CDZ) model. The key parameter for the slope of the descending branch was formulated as a function of specimen width and aspect ratio, concrete density, and compressive strength of concrete considering the size effect. Consequently, a rational stress–strain model for unconfined concrete was proposed. This model explains the trends of the peak stress and strain at the peak stress to decrease and the slope of the descending branch to increase, as the specimen width and aspect ratio increase. The proposed model agrees well with the test results, irrespective of the compressive strength of concrete, concrete type, specimen width and aspect ratio. In particular, the proposed model for the stress–strain curve rationally considered the effect of decreasing peak stress and increasing the descending branch slope, with the increase in specimen width and aspect ratio.

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Development and analysis of highly workable high‐strength heavyweight concrete using magnetite aggregates

Aslani

Lesslie

Hamidi

2020

Structural Concrete

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Heavyweight concrete (HWC) is produced by replacing natural aggregates in a concrete mix design with heavyweight aggregates of a higher specific gravity. HWC is mainly used for the prevention of leakage from radioactive containing structures and is hence primarily used in the medical and nuclear energy industries where this property is of particular benefit and importance. Also, high‐strength concrete (HSC) has been increasingly employed in both civil structures, such as high rise buildings and bridges and defense applications. This study makes attempt to develop and evaluate different concrete mixes, which are considered as high‐strength, heavyweight and highly workable in nature. Such mixes use magnetite as the primary aggregate. The three‐mentioned properties of these concrete types have been thoroughly investigated individually; however, there is a limited numbers of literature on the analysis of mix designs dealing with the three‐mentioned properties simultaneously, in which the water/cement ratio variation, and/or variation of the magnetite content have been assessed. In this study, nine highly workable high‐strength HWC mixes have been developed and fresh and hardened properties are discussed. The overall result indicates that the developed mixes satisfied the required high‐strength, heavyweight and highly workable criteria, as well as, compressive strength would increase by increasing the heavyweight aggregate content.

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Workability and Mechanical Properties of Heavyweight Magnetite Concrete

Cited by 10 publications

References 5 publications

A Stress-Strain Model for Unconfined Concrete in Compression considering the Size Effect

A Stress-Strain Model for Unconfined Concrete in Compression considering the Size Effect

A Stress-Strain Model for Unconfined in Compression Considering the Size Effect

Development and analysis of highly workable high‐strength heavyweight concrete using magnetite aggregates

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