The Experts below are selected from a list of 146751 Experts worldwide ranked by ideXlab platform
Herbert A. Mang - One of the best experts on this subject based on the ideXlab platform.
-
Computational plasticity of reinforced and prestressed Concrete Structures
Computational Mechanics, 1996Co-Authors: Günter Hofstetter, Herbert A. MangAbstract:This paper contains a summary of a survey of computational mechanics of reinforced and prestressed Concrete Structures. It begins with a description of some very important experimental results. Subsequently, mathematical models for the simulation of the material behavior are reviewed briefly, followed by an exemplary overview over the finite element method (FEM) for reinforced and prestressed Concrete Structures. The apparent success of constitutive models for Concrete, resting on the theory of plasticity, is based, to a great extent, on the excellent works of the late Prof. J. C. Simo, representing milestones of progress in computational plasticity. The survey is completed by two examples of numerical analyses of reinforced and prestressed Concrete Structures.
M. Sudhakara Reddy - One of the best experts on this subject based on the ideXlab platform.
-
Biocalcification by halophilic bacteria for remediation of Concrete Structures in marine environment
Journal of Industrial Microbiology & Biotechnology, 2016Co-Authors: Roohi Bansal, Navdeep Kaur Dhami, Abhijit Mukherjee, M. Sudhakara ReddyAbstract:Microbial carbonate precipitation has emerged as a promising technology for remediation and restoration of Concrete Structures. Deterioration of reinforced Concrete Structures in marine environments is a major concern due to chloride-induced corrosion. In the current study, halophilic bacteria Exiguobacterium mexicanum was isolated from sea water and tested for biomineralization potential under different salt stress conditions. The growth, urease and carbonic anhydrase production significantly increased under salt stress conditions. Maximum calcium carbonate precipitation was recorded at 5 % NaCl concentration. Application of E. mexicanum on Concrete specimens significantly increased the compressive strength (23.5 %) and reduced water absorption about five times under 5 % salt stress conditions compared to control specimens. SEM and XRD analysis of bacterial-treated Concrete specimens confirmed the precipitation of calcite. The present study results support the potential of this technology for improving the strength and durability properties of building Structures in marine environments.
-
Biocalcification by halophilic bacteria for remediation of Concrete Structures in marine environment
Journal of Industrial Microbiology & Biotechnology, 2016Co-Authors: Roohi Bansal, Navdeep Kaur Dhami, Abhijit Mukherjee, M. Sudhakara ReddyAbstract:Microbial carbonate precipitation has emerged as a promising technology for remediation and restoration of Concrete Structures. Deterioration of reinforced Concrete Structures in marine environments is a major concern due to chloride-induced corrosion. In the current study, halophilic bacteria Exiguobacterium mexicanum was isolated from sea water and tested for biomineralization potential under different salt stress conditions. The growth, urease and carbonic anhydrase production significantly increased under salt stress conditions. Maximum calcium carbonate precipitation was recorded at 5 % NaCl concentration. Application of E. mexicanum on Concrete specimens significantly increased the compressive strength (23.5 %) and reduced water absorption about five times under 5 % salt stress conditions compared to control specimens. SEM and XRD analysis of bacterial-treated Concrete specimens confirmed the precipitation of calcite. The present study results support the potential of this technology for improving the strength and durability properties of building Structures in marine environments.
Kazuhiro Ikawa - One of the best experts on this subject based on the ideXlab platform.
-
Cathodic protection for prestressed Concrete Structures
Construction and Building Materials, 1998Co-Authors: Kouji Ishii, Tsutomu Fukute, Hiroshi Seki, Kazuhiro IkawaAbstract:Abstract Recently, corrosion of prestressing steel in Concrete has been reported. One of the effective countermeasures to stop corrosion is cathodic protection. Cathodic protection has been applied to reinforced Concrete Structures so far. However, there are several uncertainties especially associated with applicability to prestressed Concrete Structures. The authors conducted a series of experiments using cathodic protection system on prestressed Concrete Structures in order to establish the reliable cathodic protection systems. This article indicated some experimental results on susceptibility of prestressing steel to hydrogen embrittlement and mechanical behavior of pretentioned beams subjected to current supply.
Y. F. Huang - One of the best experts on this subject based on the ideXlab platform.
-
Constitutive modeling of reinforced Concrete and prestressed Concrete Structures strengthened by fiber-reinforced plastics
Composite Structures, 2010Co-Authors: Hsuanteh Hu, Y. F. HuangAbstract:A batch of constitutive models for steel reinforcing bar, prestressing tendon, Concrete and fiber-reinforced plastic are proposed for the nonlinear finite element analysis of reinforced Concrete Structures, prestressed Concrete Structures, reinforced Concrete Structures strengthened by fiber-reinforced plastics and prestressed Concrete Structures strengthened by fiber-reinforced plastics. These material models have been tested against series of experimental data and good agreements have been obtained, which justifies the validity and the usefulness of the proposed nonlinear constitutive models.
Günter Hofstetter - One of the best experts on this subject based on the ideXlab platform.
-
Computational plasticity of reinforced and prestressed Concrete Structures
Computational Mechanics, 1996Co-Authors: Günter Hofstetter, Herbert A. MangAbstract:This paper contains a summary of a survey of computational mechanics of reinforced and prestressed Concrete Structures. It begins with a description of some very important experimental results. Subsequently, mathematical models for the simulation of the material behavior are reviewed briefly, followed by an exemplary overview over the finite element method (FEM) for reinforced and prestressed Concrete Structures. The apparent success of constitutive models for Concrete, resting on the theory of plasticity, is based, to a great extent, on the excellent works of the late Prof. J. C. Simo, representing milestones of progress in computational plasticity. The survey is completed by two examples of numerical analyses of reinforced and prestressed Concrete Structures.