1
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- Miroslava Gregerová
- Pavel Pospíšil
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2
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3
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4
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- DTA
- RTG
- Chemical analyses
- Microscopical analyses
- Micro-probe analysis (EDAX, SEM)
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5
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6
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7
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8
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9
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10
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11
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12
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13
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14
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15
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- Colour
- Granularity
- Material composition (usual, specific components)
- Porosity
- Re-crystallization
- Micrite sparite
- Crystal shape of calcite in sparite
- Coatings of sandy particles formed of calcite
- Corrosion of sandy particles
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16
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17
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- Request of archaeologists
- Is it possible to assess durability of mortars sample?
- Is it possible to identify age of mortars?
- Answer of petrologists
- Yes on the base of study:
- Mineral composition
- Stage of re-crystallization
- Position in the structure
- Climatic conditions
- Type of building material (stone, bricks etc.)
- Detail archaeological study of the structure
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18
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- Unsorted sands, mostly with quartz and QTZ-rocks
- Low content of sedimentary and metamorphic rock fragments
- Reduced number of accessory mineral types
- Specific fragments – crushed slag
and brick or wood fragments
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19
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- Mostly quartz and QTZ-rocks
- Many types of accessory minerals
- Exceptionally crushed slag or glass and brick fragments
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20
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- Approximately the same ratio of quartz grains and QTZ-rock fragments,
ratio of other rock fragments is higher in comparison to medium
constractuion phase
- Reduced number of accessory mineral types
- Without slag, glass and brick fragments
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21
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22
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23
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24
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25
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26
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27
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28
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29
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30
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- Medium construction phase was dated by archaeologists within interval
1575-1581
- Rate of sparite formation in interior – 0,005 mm/100 years and in
exterior 0,01mm/100 years
- The oldest construction phase is calculated to first half of 15th
century.
- The youngest mortars were applied during reconstruction in the half of
19th century
- Specific group of samples represent cement mortars and mortars with
chalcedony
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31
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- Relatively fast
- Accurate in identification of material composition of sand and its
provenance
- Digital image analysis
- Identification of secondary alterations of original micritic cement and
neoformed sparite
- Description of sandy particles corrosion
- Comparative analysis and formation of group of samples with the
relatively same age
- In case of knowledge of at least one construction phase absolute age
possibility of calculation of age of all mortars
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