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Related Concept Videos

Fiber Reinforced Concrete01:22

Fiber Reinforced Concrete

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Fiber-reinforced concrete significantly enhances the structural and nonstructural properties of traditional concrete by incorporating fibers like steel, glass, and polymers. These fibers, varying from natural ones such as sisal and cellulose to manufactured ones like polypropylene and Kevlar, are mixed into hydraulic cement with aggregates. Steel fibers, often preferred for their robustness, contribute to improved ductility, toughness, and post-cracking performance. The concrete is classified...
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Reinforcements in Concrete01:25

Reinforcements in Concrete

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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...
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Pumped Concrete01:13

Pumped Concrete

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Concrete in large quantities can be pumped across long distances for placing in inaccessible sites. This system comprises a hopper that receives concrete from a mixer, a pump to propel the concrete, and pipelines that facilitate its delivery.
For direct-acting pumps, the concrete enters the pump via the inlet valve under the action of gravity and suction created by the movement of the piston. This concrete is then forced into the pipeline and out through the outlet valve by the forward movement...
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Prestressed Concrete01:20

Prestressed Concrete

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Prestressed concrete is a construction technique designed to enhance the strength and durability of concrete structures. This method involves the application of a pre-set tension to high-strength steel strands used as reinforcement before the concrete is subjected to its working loads. The primary aim of prestressing is to place the concrete in a state of compression, in order to counteract the tensile forces it will experience in service. This pre-compression helps prevent crack formation in...
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Effects of Air-entrainment in Concrete01:28

Effects of Air-entrainment in Concrete

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Air entrainment in concrete significantly enhances the material's durability, especially in environments subjected to freeze-thaw cycles. Introducing small air bubbles into the concrete mix acts as internal voids that accommodate the expansion of water when it freezes, thereby alleviating internal stress and preventing structural cracks. This function is crucial in climates with significant freezing and thawing, as it protects the concrete from repeated stresses that could lead to premature...
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Design Example: Distributing Reinforcements in Concrete Sections01:22

Design Example: Distributing Reinforcements in Concrete Sections

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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...
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Improving damping capabilities in low-rise frames using reinforced rubberized concrete: A comprehensive study.

Ahed Habib1, Moussa Leblouba2, M Talha Junaid2

  • 1Research Institute of Sciences and Engineering, University of Sharjah, Sharjah, United Arab Emirates.

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|November 27, 2025
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Summary

Rubberized concrete (RBC) enhances ductility and damping but reduces strength. This study shows RBC frames can reduce seismic forces and improve damping efficiency during earthquakes, with manageable increases in interstory drift.

Keywords:
DampingEnergy dissipationNonlinear response history analysisRubberized concreteStructural material

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Area of Science:

  • Civil Engineering
  • Materials Science
  • Sustainable Construction

Background:

  • Rubberized concrete (RBC) uses recycled tire rubber as aggregate, offering a sustainable alternative to conventional concrete.
  • While RBC enhances ductility and damping, it typically shows reduced mechanical strength compared to traditional concrete.
  • A gap exists in comprehensive numerical studies on the seismic performance of rubberized concrete frames.

Purpose of the Study:

  • To numerically investigate the seismic performance of rubberized concrete (RBC) frames.
  • To compare RBC frames against conventional concrete (NC-C) and similar-strength concrete (NC-S) frames.
  • To evaluate the impact of different ground motion types on RBC frame behavior.

Main Methods:

  • Nonlinear response-history analysis of three low-rise reinforced concrete (RC) frames.
  • Subjecting frames to sixty recorded ground motions (near-fault, pulse-like, far-fault).
  • Comparing seismic response parameters between RBC, NC-C, and NC-S frames.

Main Results:

  • RBC frames showed reduced base shear (up to 13.8% vs. NC-C) and hysteretic energy (up to 29%).
  • RBC frames exhibited increased viscous damping energy (29-53%) and modest reductions in floor accelerations (up to 11.8%).
  • Interstory drift ratios increased in RBC frames but remained within acceptable ASCE 7 limits.

Conclusions:

  • Substituting conventional concrete with rubberized concrete can enhance damping efficiency in RC frames.
  • RBC frames demonstrate potential for reduced seismic forces under severe earthquakes.
  • The study highlights a trade-off between improved damping and increased interstory drift in rubberized concrete structures.