Analysis of the Pore Space of the Swietokrzyskie Region's Jurassic Devonian Limestones Based on Testing with the Use Mercury Intrusion Porosimetry and Differential Scanning Calorimetry

摘要

The Swietokrzyskie Region is an important district of exploitation of rocky resources used mainly in construction engineering.The especially valuable limestone deposits are mainly related to two geological periods(Jurassic,Devonian).The region features mines with the highest limestone resource mining output in Poland.The processes that the limestones have undergone were decisive for their technical properties,such as absorptivity,frostproofness,pore size,total volume and the diameter of transitions between them.The size of pores and their connections are crucial for the course of the water-ice phase transition and the material's absorption of water from its surroundings.The article presents the results of testing the differentiation in the pore space of 10 Jurassic and Devonian limestones.The testing featured determination of the pore size distribution by using the mercury intrusion porosimetry and of the water quantities undergoing phase transition in the pore space.As result of the conducted testing,it can be ascertained that there is good consistency between the limestone's origin and its texture,especially porosity.In terms of their porosity,Devonian limestones have good technical parameters,i.e.their porosities were similar and amounted to 1.24-1.77%,whereas the porosities of Jurassic limestones were substantially diverse and amounted to 0.96-9.70%.Based on these results,it can be ascertained that the time and depth of their backlog are not material conditions for the limestone to obtain low porosity.The authors also ascertain that there is consistency in terms of the total volume of pores designated using mercury intrusion porosimetry and low-temperature calorimetry for limestones with porosity higher than 2%.The use of the MIP method for limestones with porosity below 2% does not provide relevant information about the properties of pores which substantially affect the water-ice phase transition.