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Related Concept Videos

Permeability of Concrete01:25

Permeability of Concrete

556
Permeability in the context of concrete refers to how easily liquids or gases can pass through the material. This quality is crucial for assessing the water-tightness and durability of concrete structures and their resistance to chemical attacks. Concrete permeability can be determined through comparative laboratory tests. These tests typically involve sealing a concrete specimen from the sides, applying water pressure to the top surface with pressure, and measuring the amount of water passing...
556
Porosity in Cement Paste01:18

Porosity in Cement Paste

511
The porosity of concrete is a measure of the void spaces within its structure. These spaces impact its strength and durability significantly. When water and cement interact, a chemical reaction called hydration creates a semi-solid paste. This paste includes combined water, making up approximately 23% of the cement's dry mass, and gel water, which fills minuscule voids known as gel pores, accounting for about 28% of the cement gel volume.
The balance of water to cement in the mix is...
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Creep in Concrete01:22

Creep in Concrete

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Creep refers to the time-dependent increase in strain under a sustained load, excluding other time-dependent deformations associated with shrinkage, swelling, and thermal expansion in concrete. The primary mechanism behind creep involves the loss of physically adsorbed water from the calcium silicate hydrate within the hydrated cement paste. This process is further exacerbated by concrete's non-linear stress-strain relationship, microcrack development in the interfacial transition zone, and...
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Bleeding in Fresh Concrete01:22

Bleeding in Fresh Concrete

671
Bleeding in fresh concrete occurs when water from the mix rises to the surface. This happens because the mix's solid components fail to retain all the water as they settle, leading to separation where water collects at the top. The severity of bleeding can be measured by assessing the total settlement or by noting the decrease in height per unit height of concrete.
Bleeding can cause several issues in the concrete structure. Sometimes, the rising water gets trapped beneath large aggregate...
671
Workability of Concrete01:25

Workability of Concrete

492
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...
492
Segregation in Fresh Concrete01:16

Segregation in Fresh Concrete

665
Segregation in fresh concrete is a phenomenon where the components of the concrete mix separate, leading to uneven distribution and compromised structural integrity. This separation typically occurs when concrete is subjected to excessive horizontal movement within forms, or when it is dropped from considerable heights or forced through narrow, winding paths. As a result, heavier coarse aggregate particles settle at the bottom, while lighter, finer materials such as cement and water rise to the...
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Determination of Aggregate Surface Morphology at the Interfacial Transition Zone ITZ
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Clogging in permeable concrete: A review.

Alalea Kia1, Hong S Wong1, Christopher R Cheeseman1

  • 1Department of Civil and Environmental Engineering, Imperial College London, SW7 2BU, UK.

Journal of Environmental Management
|February 22, 2017
PubMed
Summary

Permeable concrete reduces urban flooding but clogs over time. Future research should focus on developing on-site pourable permeable concrete with reduced pore tortuosity to improve longevity.

Keywords:
CloggingFloodingInfiltrationPermeabilityPermeable concretePervious concreteSustainable urban drainage

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Area of Science:

  • Civil Engineering
  • Environmental Science
  • Materials Science

Background:

  • Permeable concrete is a key sustainable urban drainage system for mitigating local flooding.
  • Clogging by particulates significantly reduces the permeability and service life of permeable concrete structures.

Purpose of the Study:

  • To review the mechanisms of permeable concrete clogging.
  • To assess current strategies for mitigating clogging.
  • To identify future research needs for enhancing permeable concrete durability.

Main Methods:

  • Literature review of permeable concrete clogging mechanisms.
  • Analysis of factors influencing pore structure and particulate interaction.
  • Evaluation of maintenance strategies like vacuum sweeping and pressure washing.

Main Results:

  • Clogging occurs when particles accumulate and obstruct connected porosity.
  • Pore structure tortuosity directly correlates with increased clogging potential.
  • Current maintenance methods show questionable effectiveness and viability.

Conclusions:

  • Further research is needed to develop on-site pourable permeable concrete.
  • Reducing pore structure tortuosity is crucial for enhancing permeable concrete's service life.
  • Innovations in material design can improve the long-term performance of sustainable drainage systems.