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Related Concept Videos

Pozzolans01:21

Pozzolans

112
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...
112
Hydration of Cement01:24

Hydration of Cement

230
Hydration of cement is a chemical reaction between cement particles and water. This process occurs primarily through two mechanisms: through-solution and topochemical. In the through-solution process, anhydrous compounds dissolve into their constituents, hydrates form in the solution, and then precipitate from the supersaturated solution. The topochemical process involves solid-state reactions at the cement particle surface. The through-solution process dominates the topochemical process at the...
230
Additives and Fillers in Concrete01:29

Additives and Fillers in Concrete

94
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...
94
Sample Preparation for Analysis: Advanced Techniques01:08

Sample Preparation for Analysis: Advanced Techniques

333
Accurate analysis of complex samples often requires advanced preparation techniques to achieve reliable and reproducible results. Samples containing inorganic or organic materials can be challenging to dissolve or decompose effectively. Standard sample preparation methods include acid digestion, fusion, dry ashing, and wet digestion.
Acid digestion with strong acids is commonly used to dissolve inorganic materials that are insoluble (do not dissolve) in water. This method can be useful for...
333
Strength and Heat of Hydration01:29

Strength and Heat of Hydration

236
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...
236
Alkali Aggregate Reaction in Concrete01:26

Alkali Aggregate Reaction in Concrete

96
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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Updated: Jun 29, 2025

Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
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Solidification/stabilization and optimization of municipal solid waste incineration fly ash with aluminosilicate

Chengcheng Fan1, Weigao Ding1, Baomin Wang1

  • 1School of Infrastructure Engineering, Dalian University of Technology, Dalian, 116024, China.

Journal of Environmental Management
|April 5, 2024
PubMed
Summary

Adding aluminosilicate solid wastes to alkali-activated municipal solid waste incineration fly ash (MSWIFA) improves structural stability and reduces heavy metal toxicity. This optimization enhances the solidification/stabilization of MSWIFA, making it a safer material.

Keywords:
AluminosilicateHeavy metalImmobilizationLeachabilityMSWIFA

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Area of Science:

  • Materials Science
  • Environmental Engineering
  • Geochemistry

Background:

  • Alkali-activation is a key technology for solidifying and stabilizing municipal solid waste incineration fly ash (MSWIFA).
  • MSWIFA's calcium-rich, silica-poor aluminum phase leads to structural instability and contamination issues in alkali-activated bodies.
  • Optimizing MSWIFA solidification requires addressing its inherent material characteristics.

Purpose of the Study:

  • To enhance the structural properties and heavy metal immobilization of alkali-activated MSWIFA.
  • To investigate the effects of incorporating aluminosilicate solid wastes on MSWIFA solidification/stabilization (S/S) performance.
  • To provide a theoretical basis for the resource utilization of MSWIFA S/S matrices.

Main Methods:

  • Incorporation of aluminosilicate solid wastes (coal fly ash, silica fume, granulated blast furnace slag) into MSWIFA.
  • Alkali-activation process for the mixture of MSWIFA and solid wastes.
  • Assessment of compressive strength and heavy metal leachability (Pb, Zn, Cd).
  • Analysis of phase composition and microstructure using techniques like XRD and SEM (implied).

Main Results:

  • Addition of aluminosilicate solid wastes significantly improved compressive strength (31.0-50.8% increase at 28 days).
  • Leachability of heavy metals (Pb, Zn, Cd) was reduced, falling below standard thresholds (GB16889).
  • New phases (ettringite, calcium sulfoaluminate hydrate, Friedel's salt) and increased amorphous phases were detected, enhancing structural integrity.

Conclusions:

  • Aluminosilicate solid wastes effectively optimize the structural properties and heavy metal immobilization of alkali-activated MSWIFA.
  • The incorporation of Si/Al structural units promotes the formation of stable network structures and gels.
  • This study offers a viable strategy for the resource utilization of MSWIFA through enhanced S/S technology.