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Related Concept Videos

Corrosion of Reinforcement01:27

Corrosion of Reinforcement

231
The corrosion of steel reinforcement within concrete is a process influenced by the material's inherent properties and external factors. The high pH level of around 13, provided by calcium hydroxide present in concrete, initially protects the steel reinforcement by promoting the formation of a passive iron oxide layer on its surface.
However, over time and under certain conditions like carbonation, chloride ingress, and cracking this protective state can be compromised. Steel has areas with...
231
Mechanical Characteristics of Steel01:18

Mechanical Characteristics of Steel

730
The mechanical characteristics of steel are assessed through various tests that evaluate its strength, toughness, and flexibility. These tests include tension, torsion, impact, bending, and hardness assessments, each providing crucial information about steel's suitability for specific applications.
The tension test is fundamental for determining tensile strength. In this test, a steel specimen is stretched using a gripping device until it breaks. The data collected during this test are used...
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Reinforcements in Concrete01:25

Reinforcements in Concrete

136
Reinforced concrete is a composite material used extensively in construction, combining the compressive strength of concrete with the tensile strength of steel. This synergy is essential as concrete, while excellent at resisting compression, is weak under tension. Steel bars, or rebars, are embedded in the concrete to handle these tensile forces. The choice of steel is strategic; it shares a similar coefficient of thermal expansion with concrete, which ensures uniformity in response to...
136
Design Example: Distributing Reinforcements in Concrete Sections01:22

Design Example: Distributing Reinforcements in Concrete Sections

124
The topic explores the practical aspects of adjusting steel reinforcements within a concrete beam section to meet specific design requirements. When designing a reinforced concrete beam, it is essential to distribute the steel reinforcements properly to ensure structural integrity and efficiency. The example provided details a scenario where a beam requires a total steel cross-section of 4 square inches. The engineer identifies that the available steel bars have a nominal diameter of 1.693...
124
Temperature Dependent Deformation01:12

Temperature Dependent Deformation

180
In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
180
Torsion of Noncircular Members01:16

Torsion of Noncircular Members

178
Circular shafts undergoing torsional stress maintain their cross-sectional integrity due to their axisymmetric nature. This symmetry ensures an even distribution of stress, allowing the shaft to withstand torsion without distorting. In contrast, square bars, lacking this axial symmetry, experience significant distortion across their cross-sections when subjected to torsion, with the exception of along their diagonals and at lines connecting midpoints. A detailed examination of a cubic element...
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Applicability Analysis of Assessment Methods for Morphological Parameters of Corroded Steel Bars
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Study on Bond Performance between Corroded Deformed Steel Bar and DS-ECC.

Tongwei Liu1, Xinping Li1,2, Jialing Che1,3

  • 1School of Civil and Hydraulic Engineering, Ningxia University, Yinchuan 750021, China.

Materials (Basel, Switzerland)
|December 23, 2022
PubMed
Summary

This study investigated the bond between desert sands engineered cementitious composites (DS-ECC) and corroded steel bars. Optimal bond strength was observed at a 5% corrosion rate, with bond toughness influenced by anchorage length and corrosion.

Keywords:
ECCbond strengthbond toughnesscorrosion ratedesert sand

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Area of Science:

  • Civil Engineering
  • Materials Science
  • Structural Engineering

Background:

  • Engineered cementitious composites (ECC) offer enhanced ductility and crack control.
  • Corrosion of steel reinforcement significantly impacts the bond performance in concrete structures.
  • Desert sands present unique aggregate properties for composite material development.

Purpose of the Study:

  • To evaluate the bond performance between desert sands engineered cementitious composites (DS-ECC) and corroded steel bars.
  • To investigate the influence of varying corrosion rates and steel bar anchorage lengths on bond properties.
  • To establish a mathematical relationship for bond-slip behavior.

Main Methods:

  • Design and fabrication of seven groups of DS-ECC specimens with varying desert sand types.
  • Center pull-out tests were conducted on specimens with different steel bar corrosion rates (0-15%) and anchorage lengths (5d, 8d).
  • Pull-out tests were also performed on de-rusted steel bar specimens to analyze the effect of corrosion removal.

Main Results:

  • Both Tengger and Mu Us DS-ECC exhibited good bond properties with corroded steel bars.
  • Bond stress-slip curves showed distinct stages, differing between corroded and de-rusted specimens.
  • Ultimate bond strength peaked at a 5% corrosion rate, while bond toughness decreased with increased corrosion and anchorage length.

Conclusions:

  • DS-ECC demonstrates promising bond characteristics with corroded steel reinforcement.
  • Corrosion rate and anchorage length are critical factors influencing bond performance and toughness.
  • A mathematical model for the bond-slip relationship under these conditions was successfully developed.