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Miskovsky, Karel
Publications (10 of 18) Show all publications
Saiang, C. & Miskovsky, K. (2011). Effects of heat on the mechanical properties of selected rock types: A laboratory study (ed.). In: (Ed.), Qihu Qian; Yingxin Zhou (Ed.), Harmonising Rock Engineering and the Environment: proceedings of the 12th ISRM International Congress on Rock Mechanics, Beijing, October 18 - 21, 2011. Paper presented at ISRM International Congress on Rock Mechanics : 18/10/2011 - 21/10/2011 (pp. 815-820). Leiden: CRC Press/Balkema
Open this publication in new window or tab >>Effects of heat on the mechanical properties of selected rock types: A laboratory study
2011 (English)In: Harmonising Rock Engineering and the Environment: proceedings of the 12th ISRM International Congress on Rock Mechanics, Beijing, October 18 - 21, 2011 / [ed] Qihu Qian; Yingxin Zhou, Leiden: CRC Press/Balkema , 2011, p. 815-820Conference paper, Published paper (Refereed)
Abstract [en]

A laboratory study was conducted to study the effect of heat on the mechanical properties of diabase, granite and quartzitic schist at temperatures of 400◦C, 750◦C and 1100◦C. Unheated samples were also studied. The reasoning behind this study was to understand the effect of elevated temperatures on the rock mass, such as in the event of a fire in a rock tunnel. Samples from the aforementioned rock types were heat treated at temperatures shown above, cooled slowly to room temperature and then subjected to uniaxial compression and Brazilian tests. Thin sections were extracted from the heat treated samples for microscopic analyses, which assisted in explaining the reasons for the mechanical behaviour observed from the mechanical test results. The uniaxial compression test showed that the strength of the rock specimens increased by 6% for granite to 29% for diabase at 400◦C when compared to the UCS values of the unheated specimens. From 750◦C to 1100◦C the decay in the strength was very rapid. From the microscopic analyses it was concluded that the increase in the strength of the rock specimens at 400◦C is attributed to the initial reaction of the rock forming minerals, hence the rock specimens were less brittle but more plastic. The rapid drop in the strength from 750◦C to 1100◦C is attributed to the mineralogical changes, micro-cracking and dehydration due to the loss of crystal bound water. At 1100◦C the rocks were highly friable and crumbled very easily when tested mechanically. The effect of mineralogical changes was obvious in diabase where the physical appearance of the samples mimicked that of natural iron, which is believed to be due to the alteration of pyroxene. The result was an increase in strength by 29% at 400◦C compared to the unheated specimens. Even at 750◦C the strength was slightly higher than unheated specimens. In summary; the mechanical behaviour of the rock specimens depended on the temperature level and the mineralogical and physical changes that occur at that temperature.

Place, publisher, year, edition, pages
Leiden: CRC Press/Balkema, 2011
National Category
Other Civil Engineering
Research subject
Mining and Rock Engineering
Identifiers
urn:nbn:se:ltu:diva-30988 (URN)5031b0d3-d8ff-46f7-81bc-36f1f72c9865 (Local ID)978-0-415-80444-8 (ISBN)5031b0d3-d8ff-46f7-81bc-36f1f72c9865 (Archive number)5031b0d3-d8ff-46f7-81bc-36f1f72c9865 (OAI)
Conference
ISRM International Congress on Rock Mechanics : 18/10/2011 - 21/10/2011
Note
Godkänd; 2011; 20111220 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Johansson, E. & Miskovsky, K. (2010). Project: Estimation of rock aggregate quality in the road alignment by using drill cuttings analysis - by using drill cuttings analysis. Paper presented at .
Open this publication in new window or tab >>Project: Estimation of rock aggregate quality in the road alignment by using drill cuttings analysis - by using drill cuttings analysis
2010 (English)Other (Other (popular science, discussion, etc.))
Abstract [en]

The drill cuttings method is used for qualitative evaluation of rock aggregate in the road alignment during the road project stage

Identifiers
urn:nbn:se:ltu:diva-36306 (URN)ef728d81-66b4-4129-b15f-e2d7682f15b8 (Local ID)ef728d81-66b4-4129-b15f-e2d7682f15b8 (Archive number)ef728d81-66b4-4129-b15f-e2d7682f15b8 (OAI)
Note

Finansieringskälla: Other public support (public); Forskningsprogram: Vägverket; Status: Ended; Period: 01/01/2005 → 31/12/2008

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Miskovsky, K. & Loorents, K.-J. (2010). Project: Testing and calibration of LA-testing method for aggregates. Paper presented at .
Open this publication in new window or tab >>Project: Testing and calibration of LA-testing method for aggregates
2010 (English)Other (Other (popular science, discussion, etc.))
Abstract [en]

Testing of selected, critical rocks samples concerning their mechanical properties for calibration of LA-method as an EU standard for testing of rock fragmentation.

Identifiers
urn:nbn:se:ltu:diva-36042 (URN)3e3ac92b-2d77-4458-a48b-58dca2f85542 (Local ID)3e3ac92b-2d77-4458-a48b-58dca2f85542 (Archive number)3e3ac92b-2d77-4458-a48b-58dca2f85542 (OAI)
Note

Status: Ended; Period: 17/12/2010 → …

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Kondelchuk, D. & Miskovsky, K. (2009). Determination of the test methods sensitive to free mica content in aggregate fine fractions (ed.). Paper presented at . Journal of materials engineering and performance (Print), 18(3), 282-286
Open this publication in new window or tab >>Determination of the test methods sensitive to free mica content in aggregate fine fractions
2009 (English)In: Journal of materials engineering and performance (Print), ISSN 1059-9495, E-ISSN 1544-1024, Vol. 18, no 3, p. 282-286Article in journal (Refereed) Published
Abstract [en]

The detrimental influence of mica rich aggregates on structural deterioration of road pavement has been discussed in the literature for over a half century. This negative effect is of great importance especially for regions with crystalline, mica-rich bedrock and temperate, subarctic climates. Recent investigations reveal that elevated fractions of free mica particles in unbound granular materials, used in road constructions, greatly reduce bearing capacity and influence the hydraulic behavior of the road structure. Despite the awareness of mica's potential harmful effect, the absence of properly adapted analytical methods is noticeable. The scope of the current study was to test two possible analytical methods which, are susceptible to mica content and could be used as an indicating technique for quantitative determination of free mica particles in unbound granular materials. Two standard methods: Sand equivalent test and methylene blue (MB) test were assumed as the most sensitive to mica presence. The rock samples used in the tests are representative for the common crushed rock aggregates for construction purposes with different contents of mica. Both methods showed susceptibility to mica content and gave strong correlation in terms of mica content. The result of the MB test can be explained by the schistose structure of mica particles and the ability of mica to absorb liquids. Another important explanation is the increased reaction surface of mica particles, which leads to an increase in the total reaction surface of the sample. The receptiveness of the sand equivalent test to mica content could be caused by the ability of mica to stay in suspension due to its flake-shaped grains.

Keywords
Civil engineering and architecture - Geoengineering and mining engineering, Samhällsbyggnadsteknik och arkitektur - Geoteknik och gruvteknik
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-14991 (URN)10.1007/s11665-008-9293-6 (DOI)000263978000009 ()2-s2.0-62249221276 (Scopus ID)e7298330-1aaf-11de-ae94-000ea68e967b (Local ID)e7298330-1aaf-11de-ae94-000ea68e967b (Archive number)e7298330-1aaf-11de-ae94-000ea68e967b (OAI)
Note
Validerad; 2009; 20090327 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Johansson, E., Miskovsky, K. & Loorents, K.-J. (2009). Estimation of rock aggregates quality using analyses of drill cuttings (ed.). Paper presented at . Journal of materials engineering and performance (Print), 18(3), 299-304
Open this publication in new window or tab >>Estimation of rock aggregates quality using analyses of drill cuttings
2009 (English)In: Journal of materials engineering and performance (Print), ISSN 1059-9495, E-ISSN 1544-1024, Vol. 18, no 3, p. 299-304Article in journal (Refereed) Published
Abstract [en]

There is a need for an effective method to estimate the quality of crushed rock aggregates and its usability in the early stages of project planning, e.g., for road and railway constructions and quarry prospecting. The proposed method is based on mineralogical and petrographic analyses of drill cuttings and analysis of the coarse fraction to estimate the homogeneity/heterogeneity of the bedrock. The geological analyses are followed by an estimation of the rock materials' mechanical properties and their potential technical usability. Development and practical applicability (field and laboratory) of the method have been performed and correlated to three road projects from regions of different geological and climatic zones in Sweden. The study confirms the capability of the proposed method as a surveying tool.

Keywords
Civil engineering and architecture - Geoengineering and mining engineering, Samhällsbyggnadsteknik och arkitektur - Geoteknik och gruvteknik
National Category
Other Civil Engineering
Research subject
Mining and Rock Engineering
Identifiers
urn:nbn:se:ltu:diva-14749 (URN)10.1007/s11665-008-9284-7 (DOI)000263978000011 ()2-s2.0-62249218159 (Scopus ID)e2b652c0-6843-11dd-9c8e-000ea68e967b (Local ID)e2b652c0-6843-11dd-9c8e-000ea68e967b (Archive number)e2b652c0-6843-11dd-9c8e-000ea68e967b (OAI)
Note
Validerad; 2009; 20080812 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Novikov, E. & Miskovsky, K. (2009). The capillarity of mica-rich base-course aggregates (ed.). Paper presented at . Journal of materials engineering and performance (Print), 18(4), 420-423
Open this publication in new window or tab >>The capillarity of mica-rich base-course aggregates
2009 (English)In: Journal of materials engineering and performance (Print), ISSN 1059-9495, E-ISSN 1544-1024, Vol. 18, no 4, p. 420-423Article in journal (Refereed) Published
Abstract [en]

In regions of temperate climate, the destructive influence of frost is the main contributor to damage of a road structure. Commonly, the frost susceptibility of base-course aggregates is often ignored in road construction. However, a number of studies on aggregates for construction purposes, and field observations of road failures, indicate a negative influence of mica-rich rock aggregates (used in unbound applications) on the service life of road construction. The scope of the current work investigates the capillary properties of unbound base-course aggregates with varying free mica grains. The materials studied in this research are commercially available road construction aggregates, and originate from different regions of Sweden. The mineral composition of the samples has been determined by polarizing microscopy using a point-count method. The parameter characterizing the capillarity was measured using the test for determining capillary rise (VVMB24). The results show that there is a direct correlation between mica content of the aggregates and water suction by capillary forces. Therefore, mica-rich materials susceptible to frost heave, thus confirming the tendency for frost damage of unbound aggregates.

Keywords
Civil engineering and architecture - Geoengineering and mining engineering, Samhällsbyggnadsteknik och arkitektur - Geoteknik och gruvteknik
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-3598 (URN)10.1007/s11665-008-9301-x (DOI)000266038900012 ()2-s2.0-67349127327 (Scopus ID)16c9d830-4e84-11de-afea-000ea68e967b (Local ID)16c9d830-4e84-11de-afea-000ea68e967b (Archive number)16c9d830-4e84-11de-afea-000ea68e967b (OAI)
Note
Validerad; 2009; 20090601 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Johansson, E., Miskovsky, K., Loorents, K.-J. & Löfgren, O. (2008). A method for estimation of free mica particles in aggregate fine fraction by image analysis of grain mounts (ed.). Paper presented at . Journal of materials engineering and performance (Print), 17(2), 250-253
Open this publication in new window or tab >>A method for estimation of free mica particles in aggregate fine fraction by image analysis of grain mounts
2008 (English)In: Journal of materials engineering and performance (Print), ISSN 1059-9495, E-ISSN 1544-1024, Vol. 17, no 2, p. 250-253Article in journal (Refereed) Published
Abstract [en]

The need to evaluate free mica grains in fine fraction of aggregate products has initiated the development of a statistically and scientifically acceptable method. The proposed method is based on a modified point-counting approach using digital micro photos of thin sections of aggregate grains and a software package to sustain sample analysis. A thin section of aggregate grains provides permanent sample documentation readily available for complimentary or other analysis. Statistical analysis, together with a repeatable analysis of samples (permanent mounts), confirms the robustness of the method. The method is appropriate as a complementary assessment tool to estimate and trace changes or variations in quality of rock aggregate. Though, the estimation of free mica particles in fine fraction needs to be combined with other analyses, e.g., petrographic analysis and analyses of mechanical properties, to assess the quality of any rock material. As the samples can be collected from drill cuttings, i.e., an accessible residual product obtainable from surveying or production, the present method is particularly useful as a surveying tool and in prospecting and projecting activities.

Keywords
Civil engineering and architecture - Geoengineering and mining engineering, Samhällsbyggnadsteknik och arkitektur - Geoteknik och gruvteknik
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-4816 (URN)10.1007/s11665-007-9127-y (DOI)000253682500016 ()2-s2.0-40249097469 (Scopus ID)2cf03bd0-560c-11dc-a7ae-000ea68e967b (Local ID)2cf03bd0-560c-11dc-a7ae-000ea68e967b (Archive number)2cf03bd0-560c-11dc-a7ae-000ea68e967b (OAI)
Note
Validerad; 2008; 20070829 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Johansson, E., Loorents, K.-J. & Miskovsky, K. (2007). A method for estimation of free mica particles in aggregate fine fraction by image analysis of grain mounts (ed.). Paper presented at General Assembly of the European Geosciences Union : 15/04/2007 - 20/04/2007. Paper presented at General Assembly of the European Geosciences Union : 15/04/2007 - 20/04/2007.
Open this publication in new window or tab >>A method for estimation of free mica particles in aggregate fine fraction by image analysis of grain mounts
2007 (English)Conference paper, Poster (with or without abstract) (Other academic)
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-40563 (URN)fbe3b9b0-40fa-11dd-8634-000ea68e967b (Local ID)fbe3b9b0-40fa-11dd-8634-000ea68e967b (Archive number)fbe3b9b0-40fa-11dd-8634-000ea68e967b (OAI)
Conference
General Assembly of the European Geosciences Union : 15/04/2007 - 20/04/2007
Note
Godkänd; 2007; Bibliografisk uppgift: Titel på proceedings: 2007 General Assembly of the European Geosciences Union, Vienna (Austria), 15-20 Apr 2007; 20080623 (andbra)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-11-25Bibliographically approved
Miskovsky, K. (2007). Enrichment of fine mica originating from rock aggregate production and its influence on the mechanical properties of bituminose mixtures (ed.). Paper presented at General Assembly of the European Geosciences Union : 15/04/2007 - 20/04/2007. Paper presented at General Assembly of the European Geosciences Union : 15/04/2007 - 20/04/2007.
Open this publication in new window or tab >>Enrichment of fine mica originating from rock aggregate production and its influence on the mechanical properties of bituminose mixtures
2007 (English)Conference paper, Poster (with or without abstract) (Other academic)
National Category
Other Civil Engineering
Research subject
Mining and Rock Engineering
Identifiers
urn:nbn:se:ltu:diva-29256 (URN)2ab9bd40-40ef-11dd-8634-000ea68e967b (Local ID)2ab9bd40-40ef-11dd-8634-000ea68e967b (Archive number)2ab9bd40-40ef-11dd-8634-000ea68e967b (OAI)
Conference
General Assembly of the European Geosciences Union : 15/04/2007 - 20/04/2007
Note
Godkänd; 2007; Bibliografisk uppgift: Titel på proceedings: 2007 General Assembly of the European Geosciences Union, Vienna (Austria), 15-20 Apr 2007; 20080623 (andbra)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Miskovsky, K., Prikryl, R., Loorents, K.-J., Göransson, M. & Török, A. (2007). Establishment of database for mechanical characteristics of the common rock materials used for aggregate production (ed.). Paper presented at General Assembly of the European Geosciences Union : 15/04/2007 - 20/04/2007. Paper presented at General Assembly of the European Geosciences Union : 15/04/2007 - 20/04/2007.
Open this publication in new window or tab >>Establishment of database for mechanical characteristics of the common rock materials used for aggregate production
Show others...
2007 (English)Conference paper, Poster (with or without abstract) (Other academic)
National Category
Other Civil Engineering
Research subject
Mining and Rock Engineering
Identifiers
urn:nbn:se:ltu:diva-38840 (URN)d5a46210-40f8-11dd-8634-000ea68e967b (Local ID)d5a46210-40f8-11dd-8634-000ea68e967b (Archive number)d5a46210-40f8-11dd-8634-000ea68e967b (OAI)
Conference
General Assembly of the European Geosciences Union : 15/04/2007 - 20/04/2007
Note
Godkänd; 2007; Bibliografisk uppgift: Titel på proceedings: 2007 General Assembly of the European Geosciences Union Undertitel på proceedings: Vienna (Austria), 15-20 Apr 2007; 20080623 (andbra)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-11-25Bibliographically approved
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