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Related Concept Videos

Pozzolans01:21

Pozzolans

238
Pozzolans are siliceous or aluminous materials blended with Portland cement. They interact with the calcium hydroxide produced during the hydration of Portland cement and contribute to improved strength and durability of concrete. The pozzolanic activity, a measure of a pozzolan's effectiveness, is typically assessed using the strength activity index, as defined in ASTM C 618-93, which calculates the ratio of the compressive strength of cement mixtures with and without pozzolan.
Fly ash is...
238
Design Example: Sustainability in Concrete Building01:26

Design Example: Sustainability in Concrete Building

246
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...
246
Accelerated Curing of Concrete01:25

Accelerated Curing of Concrete

285
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...
285
Additives and Fillers in Concrete01:29

Additives and Fillers in Concrete

152
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...
152
Fiber Reinforced Concrete01:22

Fiber Reinforced Concrete

164
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...
164
Pumped Concrete01:13

Pumped Concrete

146
Concrete in large quantities can be pumped across long distances for placing in inaccessible sites. This system comprises a hopper that receives concrete from a mixer, a pump to propel the concrete, and pipelines that facilitate its delivery.
For direct-acting pumps, the concrete enters the pump via the inlet valve under the action of gravity and suction created by the movement of the piston. This concrete is then forced into the pipeline and out through the outlet valve by the forward movement...
146

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Self-Compacting Recycled Concrete Using Biomass Bottom Ash.

Manuel Cabrera1, M J Martinez-Echevarria2, Mónica López-Alonso2

  • 1Construction Engineering Area, University of Córdoba, 14071 Córdoba, Spain.

Materials (Basel, Switzerland)
|October 23, 2021
PubMed
Summary

Biomass bottom ash can replace natural sand and filler in self-compacting concrete. This sustainable approach reduces environmental impact from natural aggregate extraction.

Keywords:
biomass bottom ashmechanical behaviourself-compacting concrete

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Area of Science:

  • Materials Science
  • Civil Engineering
  • Environmental Science

Background:

  • Growing demand for concrete necessitates sustainable alternatives to natural aggregates.
  • Industrial waste, like biomass bottom ash, presents an opportunity for eco-friendly construction materials.
  • Conventional aggregate extraction causes significant environmental degradation.

Purpose of the Study:

  • To investigate the feasibility of using biomass bottom ash as a partial replacement for natural sand and as a filler in self-compacting concrete (SCC).
  • To evaluate the impact of biomass bottom ash incorporation on the fresh and hardened properties of SCC.
  • To promote sustainable construction practices by utilizing industrial byproducts.

Main Methods:

  • Biomass bottom ash was processed and used to replace natural sand at 10%, 20%, and 30% by volume.
  • Crushed biomass bottom ash was incorporated as a filler material at 20%, 40%, and 60% by volume.
  • Standard tests were conducted to assess the fresh and hardened properties of the resulting self-compacting concrete.

Main Results:

  • The study demonstrated that biomass bottom ash can be effectively used as a partial substitute for natural sand in SCC.
  • Incorporating biomass bottom ash as a filler material also proved feasible, with tested replacement levels.
  • The fresh and hardened properties of the concrete were evaluated, indicating successful integration of the ash.

Conclusions:

  • Biomass bottom ash is a viable and sustainable material for use in self-compacting concrete.
  • Utilizing biomass bottom ash minimizes reliance on natural resources and reduces environmental impact.
  • This research supports the development of eco-friendly construction materials through waste valorization.