Related Experiment Video
Updated: Jul 20, 2025
11:14
Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
Published on: February 21, 2017
12.4K
Natural iron-aluminosilicate as potential solid precursor for supplementary cementitious materials: A comparative
Joelle Nadia Nouping Fekoua1,2,3,4, Paul Venyite1,2, Seunkole Bila5
1Laboratory of Applied Inorganic Chemistry, University of Yaounde I, P.O. Box 812, Yaoundé, Cameroon.
Heliyon
|August 4, 2023
Summary
Geographic and climatic conditions influence laterite properties. These laterites, rich in aluminosilicates, show high reactivity and potential as supplementary cementitious materials.
Area of Science:
- Geochemistry and Materials Science
- Exploration of laterite deposits and their geopolymerization potential.
Background:
- Laterite properties are significantly influenced by geographic and climatic factors.
- Understanding these influences is crucial for utilizing laterites in geopolymer applications.
Purpose of the Study:
- To investigate the impact of geographic and climatic conditions on laterite properties.
- To evaluate the geopolymerization potential of laterites from different regions of Cameroon.
Main Methods:
- Analysis of four laterite deposits from diverse geographical zones in Cameroon.
- Characterization using Infrared (IR) spectroscopy and Brunauer-Emmett-Teller (BET) analysis.
- Assessment of particle size and microstructure.
Main Results:
- Laterites from high rainfall areas (center, south) exhibited higher iron content compared to arid regions (north, west).
- All studied laterites showed characteristic aluminosilicate IR absorption bands and high BET surface areas, especially after calcination.
- Despite variations in laterization, all laterites demonstrated near-complete conversion to geopolymers, with iron content affecting microstructure.
Conclusions:
- Laterite properties are demonstrably linked to their geographic origin and associated climate.
- The particle size, high BET surface area, and reactivity of these laterites position them as viable alternatives to metakaolin and other supplementary cementitious materials.
More Related Videos
05:50Facile Preparation of Ultrafine Aluminum Hydroxide Particles with or without Mesoporous MCM-41 in Ambient Environments
Published on: May 11, 2017
10.9K
09:34Synthesis and Characterization of Fe-doped Aluminosilicate Nanotubes with Enhanced Electron Conductive Properties
Published on: November 15, 2016
9.3K
Related Concept Videos
01:24Hydration of Cement
285
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...
285
01:21Portland Cement
254
Portland cement is the essential binding ingredient in concrete, made from finely ground materials including lime, iron, silica, and alumina. Lime is derived primarily from limestone, marble, marl, seashells, and clays, which also supply iron and alumina, while silica is sourced from sand, chalk, and bauxite. Contemporary manufacturing of Portland cement is a significant source of carbon dioxide emissions, prompting research into reducing its content in concrete through alternative...
254
01:21Pozzolans
146
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...
Fly ash is...
146
01:29Strength and Heat of Hydration
274
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...
The heat of hydration for each cement compound is significant; for instance, tricalcium aluminate (C3A) and...
274
01:29Additives and Fillers in Concrete
115
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...
The...
115
01:26Alkali Aggregate Reaction in Concrete
132
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...
132