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Related Concept Videos

Fiber Reinforced Concrete01:22

Fiber Reinforced Concrete

129
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...
129
Reinforcements in Concrete01:25

Reinforcements in Concrete

149
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...
149
Tensile Strength Considerations of Concrete01:16

Tensile Strength Considerations of Concrete

191
Considering the tensile strength of concrete involves recognizing that the theoretical strength of cement paste can be up to a thousand times higher than what is observed in practical applications. This significant discrepancy is largely attributed to the presence of microscopic cracks within the concrete. These cracks tend to amplify stress at their tips when a load is applied, a phenomenon explained by Griffith's theory of brittle fracture.
The dimensions and shape of a concrete specimen...
191
Abrasion Resistance of Concrete01:23

Abrasion Resistance of Concrete

193
Abrasion resistance is an essential characteristic of concrete that determines its durability and longevity under various wear conditions. Concrete surfaces are vulnerable to different types of abrasion. For instance, surfaces may wear down due to the constant movement of vehicles or be eroded by solids carried in water, as seen in concrete canal linings. Specific tests are conducted to measure the abrasion resistance of concrete.
One such test is the revolving disc test, where three plates...
193
Additives and Fillers in Concrete01:29

Additives and Fillers in Concrete

126
Additives and fillers are integral to enhancing the properties of concrete. Pozzolans and blast-furnace slag are additives or admixtures due to their reactions with calcium hydroxide released during cement hydration. Fillers, which are finely ground and similar in fineness to Portland cement, improve concrete attributes such as workability density, and reduce capillary bleeding or cracking. Some fillers possess hydraulic properties or participate in benign reactions within the cement paste.
The...
126
Microcracking in Concrete01:20

Microcracking in Concrete

202
Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
202

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Preparation of Aligned Steel Fiber Reinforced Cementitious Composite and Its Flexural Behavior
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Glass Fibers Reinforced Concrete: Overview on Mechanical, Durability and Microstructure Analysis.

Jawad Ahmad1, Roberto Alonso González-Lezcano2, Ali Majdi3

  • 1Department of Civil Engineering, Military College of Engineering, Risalpur, Sub Campus of National University of Sciences and Technology, Islamabad 44000, Pakistan.

Materials (Basel, Switzerland)
|July 28, 2022
PubMed
Summary

Glass fibers enhance concrete strength and durability but reduce workability. An optimal dose of 2.0% glass fiber is recommended, with higher doses requiring plasticizers for improved performance.

Keywords:
compressive strengthdurabilityglass fiberscanning electron microscopy

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Area of Science:

  • Materials Science
  • Civil Engineering
  • Construction Materials

Background:

  • Existing literature shows benefits of glass fibers in concrete.
  • Knowledge on glass fiber usage in concrete is fragmented, hindering understanding.
  • A comprehensive review is needed for glass fiber-reinforced concrete (GFRC).

Purpose of the Study:

  • To provide a detailed review of glass fiber-reinforced composites.
  • To analyze key properties and durability aspects of GFRC.
  • To identify research gaps in GFRC technology.

Main Methods:

  • Comprehensive analysis of existing literature on GFRC.
  • Presentation of mechanical properties: flowability, compressive, flexural, and tensile strength, modulus of elasticity.
  • Evaluation of durability aspects: chloride ion penetration, water absorption, ultrasonic pulse velocity (UPV), and acid resistance.
  • Examination of fiber-cement paste bond strength using scanning electron microscopy.

Main Results:

  • Glass fibers significantly improve concrete strength and durability.
  • Increased glass fiber content reduces concrete flowability and can decrease mechanical performance due to workability issues.
  • An optimal glass fiber dosage of 2.0% is generally recommended.
  • Higher glass fiber dosages (beyond 2.0%) necessitate increased plasticizer content for adequate workability.

Conclusions:

  • Glass fibers offer significant improvements in concrete mechanical properties and durability.
  • Workability is a critical factor, with an optimal fiber content around 2.0%.
  • Further research is needed to address identified knowledge gaps in GFRC applications.