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Abstract

 Widespread opinion holds that calcareous rocks have limited suitability for use in the production
 
 of aggregates and stone products having adequate frost resistance. However, some of the rocks, in
 
 particular those from earlier geological periods, provide a promising alternative to silicate rocks.
 
 The paper presents results of the analysis of Devonian carbonate rock originating from two selected
 
 mines in the Swietokrzyskie region. The examined mines extract limestone from two different
 
 deposits of the same age. The rock samples are collected from beds lying at different depths, distinct
 
 in texture and color in macroscopic examination. It was found that despite the changes in bulk density,
 
 porosity and absorption, all the examined samples were frost resistant.
 
 Using the Differential Analysis of Volumetric Strain method, the content of ice formed in the pore
 
 spaces was determined. In addition, the ratio of the content of water capable of freezing to the total
 
 pore volume, and the total amount of water absorbed due to capillary action in rock samples soaked
 
 in water, were analyzed. In all cases, it was revealed that the destructive action of freezing water was
 
 weakened due to a relatively low content of water capable of freezing and a substantial volume of
 
 pores that are not filled with water in capillary absorption.
 
 It is extremely important to be able to classify the available rock material. The generally adopted
 
 methods, including absorptivity tests, do not allow for precise categorization. In the investigations,

the authors focused on the analysis of the basic factors that are decisive for rock durability, including bulk density, pore filling level and volume absorption. The authors do not correspond compressive

strength and resistance to abrasion as this will be the subject of further research.

 
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Authors and Affiliations

Karol Skowera
Zbigniew Rusin
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Abstract

This article presents the results of research on carbonate rock samples taken from Triassic sediments of the northern area of Chorzów City. The aim of the research was to identify the mineral phases of these rocks, especially carbonate phases. The rocks from the roof part of the Bundsandstein profile and floor part of the Muschelkalk profile - Gogolin Beds - are typical sediments from the northern part of Chorzów City. These rocks were mined in the XIX century and the beginning of the XX century. The article also presents the results of research on samples of carbonate rocks taken from investigated strata. It provides a Petrographic description, the results of microscopic analysis executed in polarized, transmitted light, X-ray analysis, and microprobe measurements using a scanning microscope. The results of these analyses showed that dolomites dominate in the Bunsandstein strata. Dolomites (The sampled rocks?) are composed mainly of dolomite, but sparry calcite was also identified. Moreover, quartz, clay minerals, muscovite and iron minerals were observed in the Bundsandstein rocks. The Muschelkalk sedimentsare mainly represented by limestone. In some areas, conglomerates were also found. The conglomerates are composed of carbonate rock boulders connected by carbonate cement. Two generations of calcite were observed while investigating the limestone. The first generation calcite is micritic, and the second generation calcite forms sparry crystals different in size and shape. In some areas of the sparry calcite it is possible to observe perfect rhobohedral cleavage. Moreover, dolomite, rhodohrosite, and noncarbonate minerals like quartz, muscovite, and clay minerals were identified. The results of microscopic analysis also showed that the limestone is different in texture. The limestone presents the following textures: biomorphic, detrical, sparry, microsparry and micritic.

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Authors and Affiliations

Katarzyna Stanienda
Jacek Nowak
Tomasz Kukiełka

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