Multi-technique Investigation Of Calcium
Hydroxide Crystals At The Concrete Surface
Author(s)
E. Gueit, E. Darque-Ceretti, P. Tintillier & M. Horgnies
Abstract
The durability and aesthetic qualities of high-performance concrete, which
makes it particularly suitable for architectural applications, are constantly
compromised by environmental aggressions. In this study, an innovative solution
was developed to protect the concrete from these aggressions, which consists of
growing a mineral coating on the concrete surface. The coating is composed of
layered calcium hydroxide crystals, whose nucleation and growth are triggered
byvarious non-ionic surfactants (the details of the process will not be presented).
This paper describes the procedure used to investigate the structure of the formed
crystals. Scanning Electron Microscopy and optical microtopography were used
to determine the morphology of the crystals. Image analysis allowed the
quantification of their amount, size and shape. The contribution and limits of
each technique are discussed.
Keywords: concrete, scanning electron microscopy, image analysis, optical
microtopography, surface.
1 Introduction
The mechanical and aesthetic durability of concrete is often compromised by the
constant environmental aggressions to which the structures are exposed (organic
or inorganic particles, algae, micro-organisms, staining from various sources). It
is possible to protect concrete from these attacks and increase its durability by
applying organic coatings on the hardened surface, but this comes with
operational and environmental costs.
Keywords
concrete, scanning electron microscopy, image analysis, optical
microtopography, surface
Related Book
Other papers in this volume
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