The Experts below are selected from a list of 22593 Experts worldwide ranked by ideXlab platform

Stefan Hurlebaus - One of the best experts on this subject based on the ideXlab platform.

  • Experimental Behavior of Large Reinforced Concrete Specimen with Heavy ASR and DEF Deterioration
    Journal of Structural Engineering, 2018
    Co-Authors: Madhu M. Karthik, John B. Mander, Stefan Hurlebaus
    Abstract:

    AbstractSlight and moderate amounts of deterioration caused by alkali silica reaction (ASR)/delayed ettringite formation (DEF)-induced expansion in reinforced Concrete Specimens do not markedly or ...

  • deterioration data of a large scale reinforced Concrete Specimen with severe asr def deterioration
    Construction and Building Materials, 2016
    Co-Authors: Madhu M. Karthik, John B. Mander, Stefan Hurlebaus
    Abstract:

    Abstract Limited field data are available from reinforced Concrete Specimens exposed to environmental conditions and subjected to severe deterioration by Alkali Silica Reaction (ASR) and/or Delayed Ettringite Formation (DEF). A large-scale reinforced Concrete Specimen is subject to ASR/DEF deterioration for five years. Strain measurements indicate that both transverse and longitudinal reinforcement yield within six to twelve months of field exposure. Recorded surface strains compare well with the internal steel and Concrete strains. Transverse expansion strains markedly exceed longitudinal expansion strains. Although ASR/DEF deterioration may cause severe surface cracking and possible reinforcement corrosion in the long-term, its effect on the structure’s load carrying capacity remains unknown at this time.

  • Deterioration data of a large-scale reinforced Concrete Specimen with severe ASR/DEF deterioration
    Construction and Building Materials, 2016
    Co-Authors: Madhu M. Karthik, John B. Mander, Stefan Hurlebaus
    Abstract:

    Abstract Limited field data are available from reinforced Concrete Specimens exposed to environmental conditions and subjected to severe deterioration by Alkali Silica Reaction (ASR) and/or Delayed Ettringite Formation (DEF). A large-scale reinforced Concrete Specimen is subject to ASR/DEF deterioration for five years. Strain measurements indicate that both transverse and longitudinal reinforcement yield within six to twelve months of field exposure. Recorded surface strains compare well with the internal steel and Concrete strains. Transverse expansion strains markedly exceed longitudinal expansion strains. Although ASR/DEF deterioration may cause severe surface cracking and possible reinforcement corrosion in the long-term, its effect on the structure’s load carrying capacity remains unknown at this time.

Zhihai Liu - One of the best experts on this subject based on the ideXlab platform.

  • fiber optic 2 d sensor for measuring the strain inside the Concrete Specimen
    Sensors and Actuators A-physical, 2001
    Co-Authors: Libo Yuan, Yijun Liang, Jun Yang, Zhihai Liu
    Abstract:

    Abstract Based on white-light Michelson interferometric fiber optic sensing technique, a fiber optic two-dimensional (2-D) strain sensing system is presented. The system employs a light emitting diode (LED) as a broadband optical source and a single mode fiber that was fabricated in definite length as the strain sensor heads. The light signals are guided by the same lead in and lead out fiber, so the changing caused by the environmental temperature fluctuation of the fiber path can automatically be compensated. The two independent fiber optic strain sensors were embedded in the cubic Concrete Specimens along the main axial (horizontal) direction and the vertical direction. The sensor gauge length is 103 and 115 mm, respectively. And its resolution is about ±5 micro strain (μ e ). It is in agreement with the conventional extensometer in the range of 0–6000 μ e .

Juan Xia Zhang - One of the best experts on this subject based on the ideXlab platform.

  • effect of reinforcement speciality on average fracture spacing of reinforced Concrete Specimen
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2009
    Co-Authors: Juan Xia Zhang, Chun An Tang, Xiu Yan Zhou, Xian Zhang Guo, S G Zhuo, Y D Peng
    Abstract:

    A numerical test code named RFPA (realistic failure process analysis) was used to investigate the crack distribution rule of reinforced Concrete Specimens under axial tension. The results indicate that, the periodically distributed fracture spacing phenomenon exists in the failure process of the reinforced Concrete structure. Besides, the effect of reinforcement characteristics on the mechanical behavior and average crack spacing of reinforced Concrete was also studied in five samples with different elastic moduli of the reinforcement. The elastic modulus value of the reinforcement is considered to be an important factor not only to significantly influence the average crack spacing but also to control the ultimate strain of the Specimen. In addition, the average crack spacing is increased and the ultimate strain of the Specimen is also increased with the decrease of the elastic modulus of the reinforcement.

  • Numerical Simulation of 3-D Failure Process of Reinforced Concrete Specimen under Uniaxial Tension
    Key Engineering Materials, 2007
    Co-Authors: Juan Xia Zhang, Chun An Tang, Xiu Yan Zhou, Xing Jie Hui, Zheng Zhao Liang, Shu Hong Wang, Xian Zhang Guo
    Abstract:

    The periodically distributed fracture spacing phenomenon exists in the failure process of the reinforced Concrete prism under uniaxial tension. In this paper, A numerical code RFPA3D (3D Realistic Failure Process Analysis) is used to simulate the three-dimensional failure process of plain Concrete prism Specimen and reinforced Concrete prism Specimen under uniaxial tension. The reinforced Concrete is represented by a set of elements with same size and different mechanical properties. They are uniform cubic elements and their mechanical properties, including elastic modulus and peak strength, are distributed through the Specimens according to a certain statistical distribution. The elastic modulus and other mechanical properties are weakened gradually when the stresses in the elements meet the specific failure criterion. The displacement-controlled loading scheme is used to simulate the complete failure process of reinforced Concrete. The analyses focus on the failure mechanisms of the Concrete and reinforcement. The complete process of the fracture for the plain Concrete prism and the fracture initiation, infilling and saturation of the reinforced Concrete prism is reproduced. It agrees well with the theoretical analysis. Through 3D numerical tests for the Specimen, it can be investigated the interaction between the reinforcement and Concrete mechanical properties in meso-level and the numerical code is proved to be an effective way to help thoroughly understand the rule of the reinforcement and Concrete and also help the design of the structural Concrete components and systems.

Xian Zhang Guo - One of the best experts on this subject based on the ideXlab platform.

  • effect of reinforcement speciality on average fracture spacing of reinforced Concrete Specimen
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2009
    Co-Authors: Juan Xia Zhang, Chun An Tang, Xiu Yan Zhou, Xian Zhang Guo, S G Zhuo, Y D Peng
    Abstract:

    A numerical test code named RFPA (realistic failure process analysis) was used to investigate the crack distribution rule of reinforced Concrete Specimens under axial tension. The results indicate that, the periodically distributed fracture spacing phenomenon exists in the failure process of the reinforced Concrete structure. Besides, the effect of reinforcement characteristics on the mechanical behavior and average crack spacing of reinforced Concrete was also studied in five samples with different elastic moduli of the reinforcement. The elastic modulus value of the reinforcement is considered to be an important factor not only to significantly influence the average crack spacing but also to control the ultimate strain of the Specimen. In addition, the average crack spacing is increased and the ultimate strain of the Specimen is also increased with the decrease of the elastic modulus of the reinforcement.

  • Numerical Simulation of 3-D Failure Process of Reinforced Concrete Specimen under Uniaxial Tension
    Key Engineering Materials, 2007
    Co-Authors: Juan Xia Zhang, Chun An Tang, Xiu Yan Zhou, Xing Jie Hui, Zheng Zhao Liang, Shu Hong Wang, Xian Zhang Guo
    Abstract:

    The periodically distributed fracture spacing phenomenon exists in the failure process of the reinforced Concrete prism under uniaxial tension. In this paper, A numerical code RFPA3D (3D Realistic Failure Process Analysis) is used to simulate the three-dimensional failure process of plain Concrete prism Specimen and reinforced Concrete prism Specimen under uniaxial tension. The reinforced Concrete is represented by a set of elements with same size and different mechanical properties. They are uniform cubic elements and their mechanical properties, including elastic modulus and peak strength, are distributed through the Specimens according to a certain statistical distribution. The elastic modulus and other mechanical properties are weakened gradually when the stresses in the elements meet the specific failure criterion. The displacement-controlled loading scheme is used to simulate the complete failure process of reinforced Concrete. The analyses focus on the failure mechanisms of the Concrete and reinforcement. The complete process of the fracture for the plain Concrete prism and the fracture initiation, infilling and saturation of the reinforced Concrete prism is reproduced. It agrees well with the theoretical analysis. Through 3D numerical tests for the Specimen, it can be investigated the interaction between the reinforcement and Concrete mechanical properties in meso-level and the numerical code is proved to be an effective way to help thoroughly understand the rule of the reinforcement and Concrete and also help the design of the structural Concrete components and systems.

Madhu M. Karthik - One of the best experts on this subject based on the ideXlab platform.

  • Experimental Behavior of Large Reinforced Concrete Specimen with Heavy ASR and DEF Deterioration
    Journal of Structural Engineering, 2018
    Co-Authors: Madhu M. Karthik, John B. Mander, Stefan Hurlebaus
    Abstract:

    AbstractSlight and moderate amounts of deterioration caused by alkali silica reaction (ASR)/delayed ettringite formation (DEF)-induced expansion in reinforced Concrete Specimens do not markedly or ...

  • deterioration data of a large scale reinforced Concrete Specimen with severe asr def deterioration
    Construction and Building Materials, 2016
    Co-Authors: Madhu M. Karthik, John B. Mander, Stefan Hurlebaus
    Abstract:

    Abstract Limited field data are available from reinforced Concrete Specimens exposed to environmental conditions and subjected to severe deterioration by Alkali Silica Reaction (ASR) and/or Delayed Ettringite Formation (DEF). A large-scale reinforced Concrete Specimen is subject to ASR/DEF deterioration for five years. Strain measurements indicate that both transverse and longitudinal reinforcement yield within six to twelve months of field exposure. Recorded surface strains compare well with the internal steel and Concrete strains. Transverse expansion strains markedly exceed longitudinal expansion strains. Although ASR/DEF deterioration may cause severe surface cracking and possible reinforcement corrosion in the long-term, its effect on the structure’s load carrying capacity remains unknown at this time.

  • Deterioration data of a large-scale reinforced Concrete Specimen with severe ASR/DEF deterioration
    Construction and Building Materials, 2016
    Co-Authors: Madhu M. Karthik, John B. Mander, Stefan Hurlebaus
    Abstract:

    Abstract Limited field data are available from reinforced Concrete Specimens exposed to environmental conditions and subjected to severe deterioration by Alkali Silica Reaction (ASR) and/or Delayed Ettringite Formation (DEF). A large-scale reinforced Concrete Specimen is subject to ASR/DEF deterioration for five years. Strain measurements indicate that both transverse and longitudinal reinforcement yield within six to twelve months of field exposure. Recorded surface strains compare well with the internal steel and Concrete strains. Transverse expansion strains markedly exceed longitudinal expansion strains. Although ASR/DEF deterioration may cause severe surface cracking and possible reinforcement corrosion in the long-term, its effect on the structure’s load carrying capacity remains unknown at this time.