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Miroslav Šimun

University of Applied Health Sciences

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RESISTANCE OF ASPHALT COURSES TO PERMANENT DEFORMATIONS IN THE FORM OF RUTS

Proceedings of the International Conference on Road and Rail Infrastructure CETRA (2017)

Miroslav Šimun Andrea Strineka Tatjana Rukavina

The carriageway driving surface must have all the properties which guarantee safe and comfortable drive. One very significant property of the operating level of asphalt carriageways is the occurrence of permanent deformations in the form of ruts. The resistance of asphalt courses to rutting depends on several factors such as the properties of component materials of asphalt, composition of asphalt mix, properties and position of placed asphalt course in the pavement structure. Measurements of the asphalt resistance to rutting were done using the small size Wheel Tracker measuring device, procedure B (in the air) in accordance with the standard HRN EN 12697- 22. The work also included analyzing the dependence of the rut depth and the rutting speed on the composition of asphalt specimen, as well as the relative depth of rut in relation to the asphalt base in an optimal asphalt composition. The interdependence between the composition of asphalt specimen (three-component system) and composition of asphalt mix (twocomponent system) was also analyzed. The method of determining the resistance to rutting is described, as well as the testing requirements, testing stages and the complete procedure for determination of set parameters. The quality of asphalt mix components was previously laboratory tested, thus giving the input properties for designing the optimal asphalt composition. The confirmed optimal asphalt composition from the aspect of resistance to deformation was tested on varying thickness of courses and different combinations of asphalt courses. The influence of waterproofing and concrete carriageway slab as base on bridges was also tested for rutting. The degree of influence of bitumen as binder on the level of asphalt resistance to rutting was also tested on a series of asphalt courses, i.e. carriageway systems. The determined dependence between parameters of asphalt courses tested by rutting and the asphalt components and asphalt mix components define the guidelines for pavement structure design. Asphalt pavement with a higher level of resistance to rutting shall fulfill the main road serviceability requirements over a longer period of exploitation.

Waterproofing

Carriageway

Asphalt pavement

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Usage of wood ash in stabilization of unbound pavement layers

Road and rail infrastructure (2021)

Sanja Dimter Martina Zagvozda Branimir Milovanović Miroslav Šimun

Unbound base layers are an important part of the pavement, which consume a considerable amount of granular stone material. Favorable grain size distribution of materials, necessary for the construction of unbound base layers, is achieved by selecting a suitable material from nature or favorable material composition is achieved through mechanical stabilization. The basic principle of mechanical material stabilization is the addition of finer or larger granular material to the material of unfavorable, uniform granulometric composition, which is inherently unstable. In designing economical pavement structures, the availability of local materials of natural or industrial origin is of great importance. From natural local materials for the road construction in the area of Slavonia and Baranja, the Drava sand, a material of uniform granulometric composition of medium grain size D50 = 0.3 mm, is interesting and often in use. With the increasing number of biomass power plants in eastern Croatia, waste local material, wood ash, is also being created. Wood biomass ash, which is generated as a residue of biomass burning for electricity and heat production, is one of the newer and less explored alternative materials, which finds its application in construction as evidenced by the results of previous foreign studies. One possibility of using wood bio ashes in mixtures for unbound base layers is to modify / repair the granulometric composition of the base material. By combining the aforementioned local materials, that is, by designing a mixture of Drava sand and wood ash in appropriate proportions, it would be possible to obtain a mechanically stable mixture of increased load-bearing capacity for construction of unbound base layers. In this paper testing of mixtures composed from different proportions of Drava sand and wood ash for unbound base layers is described with the purpose of proving the stabilizing effect of wood ash.

Natural materials

Waste material

Building material

Wood ash

10.5592/co/cetra.2020.1016

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METHOD TO RECONSTRUCT URBAN TRANSPORT FACILITIES

WIT transactions on the built environment (2004)

Tatjana Rukavina Stjepan Lakušić Vesna Dragčević Miroslav Šimun

Measurements have shown that the International Roughness Index (IRI) values for the urban transport facilities predicted for reconstruction range from 5m/km to 14m/km, and for new or already reconstructed ones the values vary about 2m/km. Usual ways of repair of the pavement facilities structures in the city of Zagreb are: 1) replacement of already existing asphalt layers with a new bituminized crushed stone material base course and wearing asphalt concrete layer and 2) performance of the new pavement structure (layer of mechanically compacted course of grain stone material, bearing layer stabilized by hydraulic binder, bearing layer made of bituminized crushed stone material and a layer of splitmastix asphalt wearing course - SMA. As a large number of urban facilities are planned for reconstruction, the study was conducted to justify each repair mode. The study proposes the IRI values, obtained from the investigation measurement results upon which the reconstruction could be carried out to get the aimed IRI values ranging up to 2m/km in the end point.

Asphalt pavement

Crushed stone

International Roughness Index

Wearing course

10.2495/ut040471

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Reconstruction of the Jarunska road in Zagreb after the earthquake

Road and rail infrastructure (2024)

Miroslav Šimun Ante Goran Bajić Davor Marković Luka Jurčević

The paper analyzes the condition of the road surface of Alley Matija Ljubek in the city of Zagreb, the road around Lake Jarun. The Jarun road was built as part of the development of the Jarun Sports and Recreation Center for the Universiade in 1987. It’s 6.4 kilometers long and has one-way traffic for cars, a parking lot, as well as a separate path for bicycles and pedestrians. During 33 years of exploitation, a number of damages appeared on the roadway, which were further aggravated by seismic activities in the area of the city of Zagreb in 2020. As part of the preparation of the roadway renovation study, measurements of parameters were carried out: roughness index, route depth, macrotexture, cracks and patches on the pavement. After analyzing the measured characteristics of the driving surface, a proposal was made for the renovation of the Alley Matija Ljubek pavement. To apply for the allocation of non-reimbursable financial resources aimed at restoring the infrastructure to its proper condition, a detailed scope of work for repairing damages to the Alley Matija Ljubek road, funded by the European Union Solidarity Fund through Shoo, has been elaborated. The road was renovated in the spring of 2023 in agreement with the renovation project and with a high-quality approach to maintaining technical accuracy, safety and driving comfort. As a result, the road now has a new lifecycle for exploitation.

10.5592/co/cetra.2024.1564

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Cold mix recycling procedure during execution of asphalt pavement structure base courses - Croatian case study

24th World Road CongressWorld Road Association (PIARC) (2011)

Tatjana Rukavina Miroslav Šimun Slaviša Rajič

During the past few years in the Republic of Croatia the pavement rehabilitation executed by the application of the “in place” cold recycling procedure has been applied on several national, county and local roads. The “in place” cold recycling was executed by addition of binder, of foamed bitumen or of cement mixed with certain additives. This paper presents results of field testing and additional laboratory testing of samples of the course stabilised with cement and the additive named “X” for the purpose of this paper. The results of laboratory testing of 24-hour and 28-day compressive and tensile strength are presented of the prepared mixtures of recycled material of the pavement structure with addition of pure cement, of cement mixed with 2% of “X” additive and of cement mixed with 4% of the same additive, as well as the results of testing of frost and thaw resistance. The values of modulus of elasticity were determined on the 28-day old samples. The analysis of the results of additional laboratory testing yields conclusions which indicate the necessity of further investigation of the impact the addition of “X” additive to cement has on the physical-mechanical properties of the recycled material.

Asphalt pavement

Base course

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Analysis models of ultimate strength of furniture dowel joints

Annals of WULS Forestry and Wood Technology (2008)

P Joscak Miroslav Šimun

Dowel

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Moderna prometna infrastruktura proizvodnog pogona

Emerik Makar Miroslav Šimun Sandra Mihalinac Ante Goran Bajić

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Rehabilitation of asphalt pavement - examples from practical work

Miroslav Šimun

Obnova kolnika povezana je s procesom gospodarenja cestovnom infrastrukturom, a koji je jos uvijek u Hrvatskoj u drugom planu. No sve se vise uviđa da pravovremenim poduzimanjem određenih postupaka obnove kolnika njegov se životni vijek produžava. U radu su opisani primjeri obnove kolnika na nekoliko dionica autocesta kao i gradskih prometnica. Strucnoj se javnosti željelo ukazati na cinjenicu da je obnova kolnika zahtjevnija od novogradnje te ukoliko joj se ne pristupi s dovoljno projektantskog i izvođackog znanja, posljedice ce vrlo brzo postati ocite.

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Karakteristike vozne površine mostova u ovisnosti o sustavu hidroizolacija - asfaltni kolnik

Miroslav Šimun Tatjana Rukavina Keller Miroslav

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Drvni pepeli - otpadni materijali za održivu gradnju cesta Slavonije

Sanja Dimter Martina Zagvozda Miroslav Šimun Branimir Milovanović

Candle

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