Publication

In situ dynamic SEM imaging of hydration of cement using WETSEM technology

2007
Conference Papers

Abstract

This paper presents an in situ study of the hydration of cement pastes in the SEM, made possible by the development of a radical new technology for the investigation of wet samples: the QX capsule from QuantomiX, based on the WETSEM technology, consists of an electron transparent but water and air tight membrane, which allows the examination of cement/water suspensions without any further preparation. In this way the evolution of hydration can be followed dynamically - in the same sample - over time. Results obtained with this technique are described. In addition to plain water/cement pastes the impact of additives on the early formation of phases has been studied. The strengths and limitations of this technology were identified and discussed.

Official source

https://infoscience.epfl.ch/entities/publication/948abeea-f2d1-4127-aaa9-83b7143d6044

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2007
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/948abeea-f2d1-4127-aaa9-83b7143d6044

About this result

Related concepts (32)

Cement

A cement is a binder, a chemical substance used for construction that sets, hardens, and adheres to other materials to bind them together. Cement is seldom used on its own, but rather to bind sand and gravel (aggregate) together. Cement mixed with fine aggregate produces mortar for masonry, or with sand and gravel, produces concrete. Concrete is the most widely used material in existence and is behind only water as the planet's most-consumed resource.

Cement clinker

Cement clinker is a solid material produced in the manufacture of Portland cement as an intermediary product. Clinker occurs as lumps or nodules, usually to in diameter. It is produced by sintering (fusing together without melting to the point of liquefaction) limestone and aluminosilicate materials such as clay during the cement kiln stage. The Portland clinker essentially consists of four minerals: two calcium silicates, alite (Ca3SiO5) and belite (Ca2SiO4), along with tricalcium aluminate (Ca3Al2O6) and calcium aluminoferrite (Ca2(Al,Fe)2O5).

Portland cement

Portland cement is the most common type of cement in general use around the world as a basic ingredient of concrete, mortar, stucco, and non-specialty grout. It was developed from other types of hydraulic lime in England in the early 19th century by Joseph Aspdin, and is usually made from limestone. It is a fine powder, produced by heating limestone and clay minerals in a kiln to form clinker, grinding the clinker, and adding 2 to 3 percent of gypsum. Several types of portland cement are available.

Related publications (15)

In situ dynamic SEM imaging of hydration of cement using WETSEM technology

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