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Επίδραση της προσθήκης πυροκλαστικών υλικών στις ιδιότητες χρώματος υδραυλικών και αερικών κονιών

Kalagri Olympia

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Summary

The present thesis aimed to study the colour behavior of the commercial mortars Chaux Blanche, Lime and NHL 3.5 when replacing part of them by eight different pyroclastic materials used as natural pigments. The rocks used were of volcanic origin with pozzolanic properties from the island of Santorini.Initially, grinding was performed to pyroclastic rocks in order to achieve granulometry of less than 63μm and the materials to form a powder. Thereinafter, qualitative and quantitative mineralogical analysis was performed with X-Ray diffraction (XRD) and chemical analysis with X-Ray fluorescence spectrometry (XRF). The determination of trace elements of pyroclastic materials was investigated by the method of atomic mass spectrometry in inductively coupled plasma (ICP-MS).Then, part of the Lime and Chaux Blanche cements were replaced by pyroclastic rocks (8), in five different ratios: 2.5%, 5%, 10%, 15% and 20% while the NHL 3.5 cement was replaced in the same ratios but only by 4 pyroclastic rocks. Thus, a total of 100 mixtures of pyroclastic materials with mortars were obtained.After that, the change of the colour parameters of the eight pyroclastic materials and the above mixtures was examined with the CM-5 spectrophotometer of the Konica Minolta company, according to CIE measurement system and Lab model with parameters L, a, b, while the deviation from the perfect white ΔΕ*ab was examined, too.In the end, the display of the colour of the pyroclastic materials, the cements as well as the mixtures of the pyroclastic materials and cements, was executed using the online software EasyRGB based on the colour parameters of brightness L*, a and b.

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