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Related Concept Videos

Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

This example deals with managing the workability of concrete for a raft foundation project under hot weather conditions. Workability is crucial for ensuring the concrete is easy to place, compact, and finish. In this scenario, a slump test — a common method to measure the workability of fresh concrete — initially indicated low workability. This was attributed to the rapid water loss from the concrete mix, exacerbated by the high temperatures causing the course aggregates to heat up.
To address...
Prestressed Concrete01:20

Prestressed Concrete

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...
Shrinkage in Concrete01:27

Shrinkage in Concrete

Shrinkage in concrete is primarily due to water loss from evaporation, hydration of cement, or carbonation, leading to a reduction in volume. The volumetric contraction results in volumetric strain in concrete. However, in practice, shrinkage is measured as linear strain, which is one-third of the volumetric strain.
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Fiber Reinforced Concrete01:22

Fiber Reinforced Concrete

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...
Workability of Concrete01:25

Workability of Concrete

The workability of concrete is a crucial property that affects its handling, placing, and finishing during construction. It describes the ease with which concrete can be mixed, placed, compacted, and finished. Workability is primarily concerned with the concrete's movement and its ability to resist internal friction and external resistance from molds and reinforcements during the application process.
Concrete's workability is determined by its resistance to internal forces that arise when...
Design Example: Distributing Reinforcements in Concrete Sections01:22

Design Example: Distributing Reinforcements in Concrete Sections

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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Risk management project for work with precast concrete shells.

Linda Rose1

  • 1Department of Ergonomics, School of Technology and Health, KTH, The Royal Institute of Technology, Alfred Nobels Allé 10, 141 52 Huddinge, Sweden. gabrielasousaribeiro@gmail.com

Work (Reading, Mass.)
|February 10, 2012
PubMed
Summary
This summary is machine-generated.

This study identified major injury risks associated with precast concrete shells in construction. A system of tools and a handbook were developed to mitigate these risks, enhancing worker safety in the Swedish construction industry.

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Area of Science:

  • Construction Safety Engineering
  • Occupational Health and Safety
  • Ergonomics in Construction

Background:

  • The Swedish construction industry faces significant injury risks during the handling of precast concrete shells.
  • Existing safety protocols may not adequately address the specific hazards associated with precast concrete elements.

Purpose of the Study:

  • To identify and mitigate injury risks associated with precast concrete shell usage in construction.
  • To develop and implement practical solutions for enhancing worker safety in this sector.

Main Methods:

  • An interactive research approach was employed to understand and address injury risks.
  • Identification of major injury risks through site analysis and worker feedback.
  • Development and evaluation of a safety system comprising tools and a handbook.

Main Results:

  • Three primary injury risks related to precast concrete shells were identified.
  • A comprehensive safety system, including three distinct tools and a handbook, was created.
  • The developed system was successfully implemented at a construction company and disseminated.

Conclusions:

  • The developed safety system effectively addresses key injury risks in precast concrete shell handling.
  • Implementation of the system contributes to a safer working environment in the construction industry.
  • The project provides a transferable model for improving safety practices with precast concrete elements.