Size effect on fracture properties of concrete after sustained loading

Hua Rong, Wei Dong, Xue Zhang, Binsheng Zhang

Research output: Contribution to journalArticle

Abstract

To investigate the size effect on the fracture properties of concrete after sustained loading, concrete beams with three heights of 100 mm, 200 mm and 300 mm were first subjected to 30% peak load over 115 days. Thereafter, they were moved out from the loading frames and tested under standard static three-point bending (TPB) loading until failure. The initial fracture toughness, unstable fracture toughness, fracture energy and evolution of the fracture process zone were then derived based on the experimental results, and the size effect on these fracture properties of concrete after sustained loading were evaluated. The experimental results indicated that compared with the specimens under the static TPB tests without pre-sustained loading, the cracking initiation resistance for the concrete after sustained loading increased, resulting in the increase of the initial cracking load and initial fracture toughness. In particular, the tendency was more significant for the larger size specimens. By contrast, the effects of sustained loading on the unstable fracture toughness, fracture energy, critical crack length and FPZ evolution could be neglected. Furthermore, the size effects
on the fracture characteristics, including the fracture energy, and the FPZ evolution were obvious for the concrete specimens both under static loading and after sustained loading.
Original languageEnglish
Pages (from-to)1-12
Number of pages12
JournalMaterials and Structures
Volume52
Issue number16
Publication statusPublished - 31 Jan 2019

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Concretes
Fracture energy
Fracture toughness
Bending tests
Cracks

Keywords

  • Concrete beam
  • Three-point bending
  • Sustained loading
  • Fracture toughness
  • Fracture energy
  • Size effect

Cite this

Rong, Hua ; Dong, Wei ; Zhang, Xue ; Zhang, Binsheng. / Size effect on fracture properties of concrete after sustained loading. In: Materials and Structures. 2019 ; Vol. 52, No. 16. pp. 1-12.
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title = "Size effect on fracture properties of concrete after sustained loading",
abstract = "To investigate the size effect on the fracture properties of concrete after sustained loading, concrete beams with three heights of 100 mm, 200 mm and 300 mm were first subjected to 30{\%} peak load over 115 days. Thereafter, they were moved out from the loading frames and tested under standard static three-point bending (TPB) loading until failure. The initial fracture toughness, unstable fracture toughness, fracture energy and evolution of the fracture process zone were then derived based on the experimental results, and the size effect on these fracture properties of concrete after sustained loading were evaluated. The experimental results indicated that compared with the specimens under the static TPB tests without pre-sustained loading, the cracking initiation resistance for the concrete after sustained loading increased, resulting in the increase of the initial cracking load and initial fracture toughness. In particular, the tendency was more significant for the larger size specimens. By contrast, the effects of sustained loading on the unstable fracture toughness, fracture energy, critical crack length and FPZ evolution could be neglected. Furthermore, the size effectson the fracture characteristics, including the fracture energy, and the FPZ evolution were obvious for the concrete specimens both under static loading and after sustained loading.",
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Size effect on fracture properties of concrete after sustained loading. / Rong, Hua; Dong, Wei; Zhang, Xue; Zhang, Binsheng.

In: Materials and Structures, Vol. 52, No. 16, 31.01.2019, p. 1-12.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Size effect on fracture properties of concrete after sustained loading

AU - Rong, Hua

AU - Dong, Wei

AU - Zhang, Xue

AU - Zhang, Binsheng

N1 - Acceptance in SAN AAM: 12m embargo

PY - 2019/1/31

Y1 - 2019/1/31

N2 - To investigate the size effect on the fracture properties of concrete after sustained loading, concrete beams with three heights of 100 mm, 200 mm and 300 mm were first subjected to 30% peak load over 115 days. Thereafter, they were moved out from the loading frames and tested under standard static three-point bending (TPB) loading until failure. The initial fracture toughness, unstable fracture toughness, fracture energy and evolution of the fracture process zone were then derived based on the experimental results, and the size effect on these fracture properties of concrete after sustained loading were evaluated. The experimental results indicated that compared with the specimens under the static TPB tests without pre-sustained loading, the cracking initiation resistance for the concrete after sustained loading increased, resulting in the increase of the initial cracking load and initial fracture toughness. In particular, the tendency was more significant for the larger size specimens. By contrast, the effects of sustained loading on the unstable fracture toughness, fracture energy, critical crack length and FPZ evolution could be neglected. Furthermore, the size effectson the fracture characteristics, including the fracture energy, and the FPZ evolution were obvious for the concrete specimens both under static loading and after sustained loading.

AB - To investigate the size effect on the fracture properties of concrete after sustained loading, concrete beams with three heights of 100 mm, 200 mm and 300 mm were first subjected to 30% peak load over 115 days. Thereafter, they were moved out from the loading frames and tested under standard static three-point bending (TPB) loading until failure. The initial fracture toughness, unstable fracture toughness, fracture energy and evolution of the fracture process zone were then derived based on the experimental results, and the size effect on these fracture properties of concrete after sustained loading were evaluated. The experimental results indicated that compared with the specimens under the static TPB tests without pre-sustained loading, the cracking initiation resistance for the concrete after sustained loading increased, resulting in the increase of the initial cracking load and initial fracture toughness. In particular, the tendency was more significant for the larger size specimens. By contrast, the effects of sustained loading on the unstable fracture toughness, fracture energy, critical crack length and FPZ evolution could be neglected. Furthermore, the size effectson the fracture characteristics, including the fracture energy, and the FPZ evolution were obvious for the concrete specimens both under static loading and after sustained loading.

KW - Concrete beam

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KW - Sustained loading

KW - Fracture toughness

KW - Fracture energy

KW - Size effect

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JO - Materials and Structures

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