Abstract
Sedimentary and diagenetic features of Upper Triassic dolomites are determined and related to technical properties (apparent density, water absorption, open porosity and point load strength tested by Point Load Test, PLT) for possible use as building aggregate. Samples are taken from three quarries in the Medvednica and Samobor Mts., in the NW Croatia. Samples from the Ivanec Quarry are determined as the early-diagenetic dolomite (EDD), late-diagenetic dolomite (LDD) and “transitional” dolomite (TD). Samples from the Dolje Quarry are determined as the early-diagenetic dolomite (EDD) and late-diagenetic dolomite (LDD). The samples from the Gradna Quarry are determined as the late-diagenetic dolomites (LDD). According to the physical and mechanical properties, the best variety to use as a crushed stone or as an aggregate proved to be is the late-diagenetic dolomite from the Dolje Quarry. Samples from the Dolje Quarry have the lowest values of open porosity and water absorption and the highest values of apparent density and PLT, due to their sedimentary-diagenetic features.
Highlights
The aim of this paper is to describe sedimentary and diagenetic features of the Upper Triassic dolomites from the Medvednica and Samobor Mts. (NW Croatia) and to determine the relationship with their physical and mechanical properties
Sedimentary and diagenetic features and physical-mechanical properties have been determined and compared on the Upper Triassic dolomite samples taken from three quarries: Dolje, Ivanec and Gradna
The early-diagenetic dolomite (EDD) samples are mainly small-sized and equigranular, which contributed to their increased open porosity and water absorption values
Summary
The aim of this paper is to describe sedimentary and diagenetic features of the Upper Triassic dolomites from the Medvednica and Samobor Mts. (NW Croatia) and to determine the relationship with their physical and mechanical properties. The aim of this paper is to describe sedimentary and diagenetic features of the Upper Triassic dolomites from the Medvednica and Samobor Mts. (NW Croatia) and to determine the relationship with their physical and mechanical properties. Physical and mechanical properties of the dolomites which have been analyzed and compared, are the following: apparent density, open porosity (HRN EN 1936), water absorption (HRN EN 13755) and point load strength by Point Load Test (ISRM, 1985). Crushed stone is a natural raw-material, whose mineralogical and petrographic composition and physical-mechanical properties comply the technical requirements for civil constructions (Smith and Collis, 2001). Sedimentary-diagenetic features and physical-mechanical properties of sedimentary rocks are closely related. Testing and comparing of these properties have been highlighted by several authors, who state that besides many
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