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Related Concept Videos

Accelerated Curing of Concrete01:25

Accelerated Curing of Concrete

404
Accelerating concrete curing is achieved by applying heat and additional moisture. This process accelerates the hydration of the cement, resulting in an earlier strength gain in the concrete. Steam curing is a method wherein the concrete products are either transported through a chamber on a conveyor belt or encased in plastic, allowing steam at atmospheric pressure to circulate freely around them. This process begins with a phase of moist curing that typically lasts between 3 to 5 hours, after...
404
Curing of Concrete01:20

Curing of Concrete

318
The hydration of cement takes place within the water-filled capillary pores. However, environmental elements can disrupt this process by evaporating water from the concrete surfaces. Sealed concrete with a water-cement ratio below 0.5 experiences self-desiccation, leading to water loss. The water loss in concrete is mitigated by curing. This technique involves keeping the concrete saturated to maintain the necessary temperature and moisture conditions, to optimally fill the spaces in the cement...
318
Fiber Reinforced Concrete01:22

Fiber Reinforced Concrete

294
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...
294
Curing Methods01:26

Curing Methods

242
Concrete members with a small surface-to-volume ratio are cured by oiling and moistening the forms before casting the concrete member. These forms can be left in place for a prolonged period to prevent moisture loss, and can be wetted if made of a material suitable for wetting. If the forms are removed early, the concrete member is moistened and covered with polythene sheets to maintain moisture. For large horizontal concrete surfaces exposed to dry weather, a temporary covering is suspended...
242
Waterproofing and Anti-Bacterial Admixtures in Concrete01:22

Waterproofing and Anti-Bacterial Admixtures in Concrete

199
Concrete's susceptibility to water absorption is due to the capillary action within the pores of its hydrated cement paste. This action draws water in, creating the need for waterproofing admixtures to prevent such penetration. The efficacy of these admixtures is contingent upon the water pressure, with variations arising from different conditions such as rain, capillary rise, or hydrostatic pressure in structures intended to hold water.
Waterproofing admixtures render concrete hydrophobic,...
199

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Preparation of Aligned Steel Fiber Reinforced Cementitious Composite and Its Flexural Behavior
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Lightweight SFRC Benefitting from a Pre-Soaking and Internal Curing Process.

Marie Hornakova1, Jacek Katzer2, Janusz Kobaka3

  • 1Faculty of Civil Engineering, VSB-Technical University of Ostrava, 708 33 Ostrava-Poruba, Czech Republic.

Materials (Basel, Switzerland)
|December 15, 2019
PubMed
Summary

This study developed lightweight fiber-reinforced concrete using pre-soaked waste aggregates and internal curing. The resulting concrete, incorporating steel fibers, demonstrated feasible mix preparation and suitable mechanical properties for structural applications.

Keywords:
SFRCinternal curingrecyclingsustainabilitywaste ceramic

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Area of Science:

  • Materials Science
  • Civil Engineering
  • Sustainable Construction

Background:

  • Developing sustainable construction materials is crucial for reducing environmental impact.
  • Lightweight concrete offers advantages in structural applications, reducing dead loads.
  • Internal curing enhances concrete durability and performance, particularly with porous aggregates.

Purpose of the Study:

  • To design and evaluate a structural lightweight fiber-reinforced concrete utilizing internal curing.
  • To investigate the feasibility of using pre-soaked waste red ceramic and artificial clay aggregates.
  • To assess the mechanical properties of concrete mixes with varying copper-coated steel fiber content.

Main Methods:

  • Utilized pre-soaked waste red ceramic fine aggregate and artificial clay expanded coarse aggregate.
  • Incorporated copper-coated steel fibers at volume fractions of 0.0%, 0.5%, 1.0%, and 1.5%.
  • Tested concrete specimens (cubes, cylinders, beams) for consistency, strength, and elastic properties.

Main Results:

  • Achieved concrete classified as LC12/13, suitable for structural lightweight applications.
  • Demonstrated the feasibility of a mix preparation method using only pre-soaked aggregates without extra water.
  • Evaluated compressive strength, splitting tensile strength, modulus of elasticity, flexural, and shear characteristics.

Conclusions:

  • The developed lightweight fiber-reinforced concrete is a viable sustainable construction material.
  • Internal curing with pre-soaked aggregates is an effective method for producing workable and strong concrete.
  • The inclusion of steel fibers enhances the mechanical performance of the lightweight concrete.