Lecture

Clay Reactivity: Kaolinite and LC³ Technology

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Description

This lecture explores the reactivity of clay minerals, focusing on the importance of kaolinite content in LC³ technology. It covers the dehydroxylation process, the reactivity of different clays, metakaolin formation, and methods to assess clay suitability. The relationship between overall chemistry and clay content, as well as the chemical composition requirements for good reactivity, are discussed. Practical ways of determining kaolinite content and the impact of low-grade clays are also addressed. The lecture concludes with a summary emphasizing the significance of kaolinite in determining clay reactivity.

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Cement Chemistry and Sustainable Cementitious Materials

We all know the concrete used to build our houses, offices, schools, or bridges, but do you know why concrete resists? The aim of this course is to offer solid knowledge on cement chemistry to practioners or to new student in the field. It is therefore not necessary to have a cement background, however basic concepts in chemistry, physics and crystallography can help. This course lasts 6 weeks during which you can take theoretical courses and tutorials to test the cement in the laboratory. You will learn h

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Related concepts (28)

Kaolinite

Kaolinite (ˈkeɪ.ələˌnaɪt,_-lɪ- ) is a clay mineral, with the chemical composition Al2Si2O5(OH)4. It is a layered silicate mineral, with one tetrahedral sheet of silica () linked through oxygen atoms to one octahedral sheet of alumina () octahedra. Kaolinite is a soft, earthy, usually white, mineral (dioctahedral phyllosilicate clay), produced by the chemical weathering of aluminium silicate minerals like feldspar. It has a low shrink–swell capacity and a low cation-exchange capacity (1–15 meq/100 g).

Chemical composition

A chemical composition specifies the identity, arrangement, and ratio of the chemical elements making up a compound by way of chemical and atomic bonds. Chemical formulas can be used to describe the relative amounts of elements present in a compound. For example, the chemical formula for water is H2O: this means that each molecule of water is constituted by 2 atoms of hydrogen (H) and 1 atom of oxygen (O). The chemical composition of water may be interpreted as a 2:1 ratio of hydrogen atoms to oxygen atoms.

Chemical substance

A chemical substance is a form of matter having constant chemical composition and characteristic properties. Chemical substances can be simple substances (substances consisting of a single chemical element), chemical compounds, or alloys. Chemical substances that cannot be separated into their simpler constituent elements by physical means are said to be 'pure'; this notion intended to set them apart from mixtures.

Clay

Clay is a type of fine-grained natural soil material containing clay minerals (hydrous aluminium phyllosilicates, e.g. kaolinite, Al2Si2O5(OH)4). Clays develop plasticity when wet but can be hardened through firing. Most pure clay minerals are white or light-coloured, but natural clays show a variety of colours from impurities, such as a reddish or brownish colour from small amounts of iron oxide. Clay is the oldest known ceramic material. Prehistoric humans discovered the useful properties of clay and used it for making pottery.

Mineral

In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid substance with a fairly well-defined chemical composition and a specific crystal structure that occurs naturally in pure form. The geological definition of mineral normally excludes compounds that occur only in living organisms. However, some minerals are often biogenic (such as calcite) or organic compounds in the sense of chemistry (such as mellite). Moreover, living organisms often synthesize inorganic minerals (such as hydroxylapatite) that also occur in rocks.

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