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Related Concept Videos

Effect of Sea Water on Concrete01:22

Effect of Sea Water on Concrete

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Concrete exposed to seawater can undergo degradation like the dissolution of ettringite and gypsum, increasing the material's porosity and decreasing its strength. In contrast, the crystallization of salts within the concrete's pores can cause expansion, particularly above the waterline where evaporation occurs. Nonetheless, this expansion only happens when seawater, enabled by the concrete's permeability, manages to infiltrate the structure.
Concrete in areas between tide marks,...
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Waterproofing and Anti-Bacterial Admixtures in Concrete01:22

Waterproofing and Anti-Bacterial Admixtures in Concrete

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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,...
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Design Example: Sustainability in Concrete Building01:26

Design Example: Sustainability in Concrete Building

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As the construction industry moves towards more eco-friendly practices, concrete's adaptability and its ability to incorporate sustainable features make it a key material in the drive towards greener building solutions.
There are multiple approaches to achieve sustainability in a commercial concrete building. For instance, construct a concrete parking area under the building, utilizing pervious concrete paver blocks in open areas to facilitate rainwater collection through an underground...
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Alkali Aggregate Reaction in Concrete01:26

Alkali Aggregate Reaction in Concrete

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The alkali-aggregate reaction in concrete involves natural siliceous minerals in aggregates reacting with alkaline hydroxides derived from cement alkalis. This reaction forms an alkali-silica gel that absorbs water, swells, and increases in volume, which is confined by the surrounding cement paste, creating internal pressures that crack and disrupt the concrete. The extent of expansion and damage can be partly attributed to the alkali-silica reaction's osmotic hydraulic pressure and the...
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Permeability of Concrete01:25

Permeability of Concrete

459
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...
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Accelerated Curing of Concrete01:25

Accelerated Curing of Concrete

441
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...
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Aerobic Biodegradation Testing of Materials Using a Natural Marine Seawater Inoculum and Closed Loop Respirometer
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Published on: October 24, 2025

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Biochar-based concrete as biocompatible building material for marine artificial structures.

Manuela Piccardo1, Monia Renzi1, Alberto Pallavicini2

  • 1Dipartimento di Scienze della Vita, Università di Trieste, 34127, Trieste, Italy; CoNISMa, Consorzio Interuniversitario per le Scienze del Mare, Piazzale Flaminio 4, 00196, Roma, Italy.

Journal of Environmental Management
|October 8, 2025
PubMed
Summary

Biochar-based concrete shows no negative effects on marine life and colonization. This sustainable building material can be used for marine constructions, reducing their carbon footprint.

Keywords:
Artificial reefsCarbon storageClimate changeDNA metabarcodingEcological successionMarine macrobenthos

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Area of Science:

  • Marine Ecology
  • Materials Science
  • Environmental Science

Background:

  • Increasing human activities in marine environments necessitate sustainable artificial structures.
  • Biochar concrete offers potential for waste recycling, carbon storage, and reduced environmental impact.
  • Limited data exists on the ecotoxicological effects of biochar concrete on marine biota.

Purpose of the Study:

  • To evaluate the biological suitability of biochar-based concrete for marine applications.
  • To assess the impact of biochar concrete on marine organisms and benthic assemblages.
  • To determine if biochar concrete affects microfouling and macrobenthic colonization.

Main Methods:

  • Laboratory ecotoxicological tests on target marine organisms.
  • Field experiments using manipulative setups in three Mediterranean sites.
  • Monitoring of micro- and macrobenthic assemblages on submerged biochar concrete over six months.

Main Results:

  • No significant ecotoxicological responses were observed in marine organisms exposed to biochar.
  • Biochar concrete (up to 10% wt.) did not alter early microfouling or macrobenthic assemblage structure.
  • Total biomass of macrobenthic assemblages remained unaffected by biochar addition in concrete.

Conclusions:

  • Biochar-based concrete appears biologically suitable for marine construction.
  • The use of biochar concrete can contribute to reducing the carbon footprint of artificial marine structures.
  • Further research in diverse habitats and with different biochar types is recommended for broader conclusions.