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Petrographic Analysis of Hardened Concrete

Pelcon has a long experience in preparing and analyzing fluorescence impregnated thin and plane sections. Moreover we conduct analysis on split fully fluorescence impregnated cores and on various aggregates.

Based on the analysis of thin sections a long series of parameters and properties can be described, among those:

 - w/c-ratio and homogeneity of cement paste
 - Cementtype and content
 - Paste hydratisation and content of microcracks
 - Sand quality and potential alkali reactivity
 - Puzzolan type and quality
 - Bleeding and paste stability while the concrete was still plastic
 - Bonding quality and ITZ for paste-sand and paste-stone
 - Degree of carbonation
 - Age of concrete
 - Crack and defect investigation



A 20µm thick fluorescence impregnated thin section in uv-light. The dimensions are 45mm x 30mm x 0.020mm.


 The analysis of plane sections can supplement or clarify another set of parameters and properties:

 - Internal stability
 - Degree of compaction
 - Bonding quality of paste-stone and paste-reinforcement
 - Stone content and distribution
 - Formation of layers
 - Evaluation of casting joints
 - Crack and defect investigation


Example of a fluorescence impregnated plane section seen in normal light and UV light:



Plane and thin sections are prepared in accordance with Danish Standards:

 DS 423.39  Production of fluorescence impregnated plane sections
 DS 423.40  Production of fluorescence impregnated thin sections


Analyses are conducted in accordance with:

 DS 423.41  Internal stability
 DS 423.42  Concrete composition
 DS 423.43  Paste homogeneity
 DS 423.44  Paste cracks and bond cracks
 DS 423.45  Degree of compaction
 TI-B 5  Structure analysis in connection with QC






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