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Related Concept Videos

Alkali Aggregate Reaction in Concrete01:26

Alkali Aggregate Reaction in Concrete

213
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...
213
Accelerators01:17

Accelerators

114
Accelerators in concrete serve as admixtures to speed up the hardening process, enabling the concrete to achieve early strength faster. Although accelerators do not necessarily impact the time it takes concrete to set, they reduce this time in practice. A common accelerator is calcium chloride, which is particularly useful for hastening early strength development in cold weather or for rapid repair jobs that require quick heat generation after mixing.
The effectiveness of calcium chloride can...
114
Pozzolans01:21

Pozzolans

228
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...
228
Strength and Heat of Hydration01:29

Strength and Heat of Hydration

377
The hydration of cement is an exothermic reaction in which heat is generated as cement hydrates. This heat of hydration is critical to cement's strength development. The rate at which this heat is generated affects the temperature rise, with a majority of the heat being released early in the hydration process, half within the first three days, and about 75% within the first week.
The heat of hydration for each cement compound is significant; for instance, tricalcium aluminate (C3A) and...
377
Compacting Factor test01:22

Compacting Factor test

292
The compacting factor test is a method used to assess the workability of concrete. It is  especially suitable for concrete mixes containing aggregates up to one and a half inches in size. This test involves specialized equipment consisting of two truncated cone-shaped hoppers and a cylinder, all with polished interior surfaces to minimize friction.
The procedure begins by placing concrete into the upper hopper without any compaction. Once filled, the bottom door of this hopper is opened,...
292
Additives and Fillers in Concrete01:29

Additives and Fillers in Concrete

146
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...
146

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Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
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Self-Compacting Alkali-Activated Materials: Progress and Perspectives.

Zengqing Sun1, Qingyu Tang1, Xiaohui Fan1

  • 1School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China.

Molecules (Basel, Switzerland)
|January 11, 2022
PubMed
Summary
This summary is machine-generated.

Self-compacting alkali-activated materials (SCAAMs) offer enhanced performance for civil infrastructure. This review covers their properties, challenges, and potential as advanced construction materials.

Keywords:
alkali-activated materialsdurabilitymechanical strengthself-compactingworkability

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Area of Science:

  • Materials Science
  • Civil Engineering
  • Green Chemistry

Background:

  • Alkali-activated materials (AAMs) are emerging as sustainable alternatives to traditional Portland cement.
  • Developing AAMs with self-compacting properties is crucial for advanced infrastructure applications.
  • Self-compacting AAMs (SCAAMs) exhibit improved workability and mechanical properties.

Purpose of the Study:

  • To critically review recent advancements in self-compacting alkali-activated materials (SCAAMs).
  • To analyze SCAAMs' mixture proportions, fresh and hardened properties, and durability.
  • To identify research challenges and future perspectives for SCAAMs in construction.

Main Methods:

  • Normalization of mixture proportions for comparative analysis.
  • Review of fresh properties, mechanical strength, and microstructure.
  • Assessment of durability (acid/sulfate resistance), high-temperature behavior, and impact resistance.

Main Results:

  • SCAAMs demonstrate superior passing and filling abilities.
  • Normalized data reveals correlations between composition and mechanical performance.
  • Comprehensive data on various performance aspects including microstructure and durability.

Conclusions:

  • SCAAMs present significant mechanical and environmental advantages over conventional materials.
  • Further research is needed to address current challenges and promote field applications.
  • SCAAMs hold great promise as advanced construction materials for sustainable infrastructure.