Otpornost dolomitnih agregata na udarno habajuća opterećenja i zamrzavanje

Scientific paper - Original scientific paper

• Title (english): Resistance of dolomite aggregates to freezing and abrasive impact strain
• Author: Ivan Tomašić
• Author: Tomislav Ženko
• Author: Saša Aljinović
• Author's institution: University of Zagreb; Faculty of Mining, Geology and Petroleum Engineering; (Department of Mineralogy, Petrology and Mineral Resources)
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mining, Petroleum and Geology Engineering

Abstract (croatian)

Dolomitni agregati iz kamenoloma Čelina, Podsusedsko Dolje i Jarče polje podvrgnuti su ispitivanju na udarno habajuća opterećenja i zamrzavanje. Pri tome su korištene nenormirane i normirane metode prema HRN-u i ASTM-u. Posebna pažnja posvećena je određivanju koeficijenta Los Angeles (KLA), koeficijenta drobivosti (KD) i indeksa pregranulacije (lp) prije te nakon 25 i 50 ciklusa zamrzavanja. Dobivene vrijednosti, prikazane tebelarno i grafički, posljedica su strukturno-teksturnih i petrografskih značajki, geneze i različitih postgenetskih procesa, prije svega tektonike (mikroraspucanost i kataklaziranje) i rekristalizacije. Posebno je utvrđen utjecaj veličine, oblika i međusobne povezanosti kristala dolomita na udarno habajuća opterećenja te defekata u obliku savijanja, tlačnih sraslačkih lamela i kalavosti.

Abstract (english)

Dolomite aggregates from quarries Čelina, Podsusedsko Dolje and Jarče polje were subjected to tests of abrasive impact strain and freezing. The tests were performed mainly according to standard HRN and ASTM methods and only partly were unstan-dardized methods used. Emphasis was placed on the determination of the Los Angeles coefficient (KLA), the crushing coefficient (KD), and the re-crushing indexes (lp), before and after 25 and 50 freezing cycles. The obtained data (presented both in tabular and graphic form) are a result of structural and textural petrograp-hic features, genesis and various postgenetic processes, markedly tectonics (microfracturing and cataclasis) and recrystallisation. The influence of size, shape and alignance of dolomite crystals to abrasion and impact strain was investigated together with curving defects, stress twining lamelle and cleavage.

• Keywords (croatian): dolomitni agregati; otpornost na habanje i udar (Los Angeles); otpornost na zamrzavanje
• Keywords (english): dolomite aggregates; resistance by abrasion and impact (Los Angeles); stability of freezing
• Language: croatian
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Rudarsko-geološko-naftni zbornik
• Numbering: vol. 4, no. 1, pp. 119-126
• p-ISSN: 0353-4529
• e-ISSN: 1849-0409
• URN:NBN: urn:nbn:hr:169:703983
• Publication: 1992
• Document URL: https://hrcak.srce.hr/24754
• Type of resource: Text
• Access conditions: Open access
• Created on: 2024-04-03 11:33:03