Mechanical Properties of Concrete Made from Different Expanded Lightweight Aggregates

Lee, Kyung-Ho; Yang, Keun–Hyeok; Mun, Ju–Hyun; Kwon, Seung-Jun

doi:10.14359/51712265

Cited by 12 publications

(11 citation statements)

References 17 publications

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“…To compensate for this, additional test results for the size effect of concrete were compiled. e compiled additional test results [4,5,[12][13][14][15] for the stressstrain relationship were 38 data records for LWC and 26 data records for NWC, as shown in Table 1. To consider various specimen shapes, an equivalent diameter (d eq ≈ �� (4B D/π) ) was introduced, where B and D are the sectional width and depth of prism specimen, respectively, assuming that the area of the prism specimens is identical to that of cylinder specimen.…”

Section: Databasementioning

confidence: 99%

“…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: Databasementioning

confidence: 99%

Section: Determination Of βmentioning

confidence: 99%

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%

“…To compensate for this, additional test results for the size effect of concrete were compiled. The compiled additional test results [4,5,[23][24][25] for the stress-strain relationship were 38 datasets for LWC, and 20 datasets for NWC, as shown in Table 1.…”

Section: Databasementioning

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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“…The present study examines the flexural performance of eight reinforced LWAC T‐beams made using the expanded bottom ash and dredged soil granules (hereafter, this beam type is referred to as LWAC‐BS beam) under symmetrical top two‐point loadings. The equivalent rectangular stress block generalized in the previous study 13 is modified using the stress–strain relationship 19 proposed for LWAC‐BS to examine the flexural capacity of the beam specimens. Additionally, to examine the ductility decrease of LWAC beams as compared with NWC beams, the displacement ductility ratio of the T‐beams tested is compared with those compiled from NWC beams 20 and LWAC‐CF beams 21 with respect to the longitudinal reinforcement index.…”

Section: Introductionmentioning

confidence: 99%

Flexural capacity and ductility of lightweight concrete T‐beams

Yang

Hwang

Song

2020

Structural Concrete

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The present study aims to estimate the flexural capacity and ductility of lightweight concrete T‐beams prepared using the expanded bottom ash and dredged soil granules (LWAC‐BS beams). Eight full‐scale beams were prepared under the main parameters including the unit weight and compressive strength of concrete and amount of longitudinal tensile reinforcement. The moment capacities and displacement ductility ratios measured for the present specimens were compared with those compiled from normal‐weight concrete (NWC) beams and lightweight concrete beams made using the expanded clay and fly ash granules (LWAC‐CF beams) with respect to the longitudinal reinforcement index (ωs). The coefficients for the equivalent rectangular stress block to assess the ultimate moment capacity of LWAC beams were formulated from the actual stress–strain curve of the concrete. The test results showed that the effect of the type of artificially expanded lightweight granules on the normalized cracking and ultimate moment capacities of LWAC beams was insignificant, whereas LWAC‐BS beams exhibited lower displacement ductility ratios than LWAC‐CF beams at the same ωs value. The maximum amount of longitudinal tensile reinforcement specified in ACI 318‐14 provision for preventing brittle failure of the beam needs to be lowered for LWAC beams. When determining the coefficients of the equivalent stress block for LWAC members, the concrete unit weight deserves consideration as a primary factor together with the compressive strength of the concrete.

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Mechanical Properties of Concrete Made from Different Expanded Lightweight Aggregates

Cited by 12 publications

References 17 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

Flexural capacity and ductility of lightweight concrete T‐beams

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