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Related Concept Videos

Curing of Concrete01:20

Curing of Concrete

319
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...
319
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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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
Acid Attack on Concrete01:21

Acid Attack on Concrete

635
When acids come into contact with concrete, they initiate a chemical reaction that dissolves the hydrated cement paste. This process leads to softening and structural weakening of the concrete. This issue is commonly observed in environments such as chimneys, sewers, and industrial settings. The severity of the damage increases as the pH of the water interacting with the concrete drops below 6.5. In particular, a pH under 4.5 can cause significant concrete damage.
The rate at which hydrogen...
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Bleeding in Fresh Concrete01:22

Bleeding in Fresh Concrete

448
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...
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Bioremediation00:46

Bioremediation

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Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful toxins in groundwater as a byproduct of agricultural run-off and also to clean up oil spills.
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Self-Healing Concrete by Biological Substrate.

How-Ji Chen1, Ching-Fang Peng1, Chao-Wei Tang2,3,4

  • 1Department of Civil Engineering, National Chung-Hsing University, No. 250, Kuo Kuang Road, Taichung 402, Taiwan.

Materials (Basel, Switzerland)
|December 11, 2019
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Summary

This study explores using Bacillus pasteurii bacteria for eco-friendly concrete crack repair. The bacteria induce calcium carbonate precipitation, effectively healing cracks and offering a sustainable alternative to traditional methods.

Keywords:
Bacillus pasteurii bacteriacrack repairself-healing concrete

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Area of Science:

  • Civil Engineering
  • Environmental Science
  • Microbiology

Background:

  • Traditional concrete crack repair materials like epoxy and acrylic resins are environmentally unfriendly.
  • These materials often fail due to differential shrinkage and thermal expansion, causing delamination.

Purpose of the Study:

  • To investigate the feasibility of using microbial techniques for concrete crack repair.
  • To evaluate the effectiveness of Bacillus pasteurii in self-healing concrete cracks.

Main Methods:

  • Utilizing lightweight aggregates as carriers for Bacillus pasteurii to enhance bacterial survival.
  • Employing microscopic testing to assess crack repair and X-ray Diffraction (XRD) to confirm precipitate composition.

Main Results:

  • Bacillus pasteurii successfully induced Microbiologically Induced Calcium Carbonate Precipitation (MICP).
  • Calcium carbonate deposition effectively filled concrete cracks, originating at the aggregate-cement paste interface.
  • XRD analysis confirmed the precipitate as calcium carbonate, validating the repair mechanism.

Conclusions:

  • Microbial concrete crack repair using Bacillus pasteurii is feasible and effective.
  • This eco-friendly approach offers a promising alternative to conventional repair materials.