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1.
Quality checking of polymer modified bitumens in Slovenia
Marjan Tušar, Lidija Ržek, Mojca Ravnikar Turk, 2021, objavljeni znanstveni prispevek na konferenci

Povzetek: For many years the properties of bitumen have been determined based on mechanical tests as needle penetration, Ring&Ball and Fraass fracture temperature. For elastomer (styrene-butadiene-styrene) polymer modified bitumens these tests are not sufficient to show the important differences in bitumens. Elastic recovery and cohesion provide better insight, but rheological properties cannot be adequately described with conventional test. The requirements of the polymer modified bitumens (PmB) in Europe were defined in EN14023 in 2010 [1]. Since then several new tests were introduced in the research field and their procedures improved. In the European Standards Committee (CEN) TC 336, there is on-going work to develop performance related specifications. New laboratory test methods from American standards were adapted and transformed into EN standards (bitumen laboratory aging methods and rheological tests). These test methods are not yet employed in the cur-rent PmB European standard, however, the draft prEN 14023, April 2020 [2] suggests these new tests. In the recent years at ZAG Laboratory for asphalts and bitumen-based products long-term aging of bitumen by pressure aging vessel (PAV) and rheological tests were introduced. Traditional bitumen test methods are performed together with new rheological testse.g. Dynamic Shear Rheometer (DSR) testing, to characterize complex modulus and phase angle, and Multiple Stress Creep Recovery Test (MSCRT) in order to develop a preliminary data base on PmB’s, which are frequently used in Slovenia. The paper presents the current requirements for PmB’s in Slovenia and test results on PmB 45/80-65, original, laboratory aged and extracted from produced asphalt mixtures.
Ključne besede: polymer modified bitumen, recovered bitumen, laboratory ageing, dynamic shear rheometer, multiple stress creep recovery test
Objavljeno v DiRROS: 28.02.2024; Ogledov: 96; Prenosov: 64
.pdf Celotno besedilo (703,78 KB)
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2.
Volumetric view on asphalt mixture
Marjan Tušar, Mojca Ravnikar Turk, Lidija Ržek, 2023, objavljeni znanstveni prispevek na konferenci

Povzetek: An asphalt layer consists of stone aggregates, binder and air voids. The content of air voids (Vmin and Vmax), the voids filled with bitumen (VFBmin and VFBmax), the content of air voids in stone aggregates (VMAmin and VMAmax) and volume content of bitumen (VBmin) should be determined for each type of asphalt mixture. The volumetric properties of asphalt layer listed above are important parameters for assessing the properties of asphalt and are usually first presented in the requirements for produced asphalt mixtures and built in asphalt layers. Visualization of volumetric properties is important for understanding the composition of the produced asphalt mixture. The most appropriate is a triangular representation of the volumetric requirements for three main components of asphalt layer (stone, bitumen and air).
Ključne besede: volumetric representation, asphalt mixture, void content, voids in aggregate
Objavljeno v DiRROS: 22.02.2024; Ogledov: 112; Prenosov: 51
.pdf Celotno besedilo (715,71 KB)
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3.
Rejuvenator obtained by pyrolysis of waste tires for use in asphalt mixtures with added reclaimed asphalt
Lidija Ržek, Mojca Ravnikar Turk, Marjan Tušar, 2022, samostojni znanstveni sestavek ali poglavje v monografski publikaciji

Povzetek: Although in recent years, big progress has been made in the field of recovering waste tires, they still represent an unwanted waste and their production is constantly increasing. We can use waste tires as a raw material for a new product. In our study, multiple liquid products were produced by pyrolysis of waste tires. After extensive testing of their properties, we selected the most suitable pyrolytic product for the purpose of rejuvenation. Rejuvenators are designed to soften the old, brittle and stiff aged bitumen in reclaimed asphalt. Bitumen with its viscoelastic characteristics is the most important component of asphalt and dictates its behaviour. Commonly bitumen, after adding rejuvenator, becomes less viscous, more ductile and its coating properties are restored. By using a pyrolytic rejuvenator, the proportion of reclaimed asphalt added to the asphalt mixture was increased. The reuse of reclaimed asphalt and waste tires means a reduction in waste material and is therefore important for the preservation of the environment and sustainable development.
Ključne besede: pyrolyse, rejuvenator, bitumen, reclaimed asphalt, waste tires
Objavljeno v DiRROS: 31.01.2024; Ogledov: 119; Prenosov: 50
.pdf Celotno besedilo (840,71 KB)
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4.
Reološko ovrednotenje alternativnega pomlajevalca, pridobljenega iz odpadnih snovi
Lidija Ržek, 2019, izvirni znanstveni članek

Povzetek: Zaradi sodobnega načina življenja je nastanek odpadkov neizogiben. Vse večja okoljska ozaveščenost, predvsem pa tržna naravnanost in ekonomičnost nas spodbujajo, da odpadke obravnavamo kot vir za nadaljnjo oz. ponovno uporabo. V raziskavi smo izdelali alternativni pomlajevalec iz odpadnih gum in pokazali, da lahko povrne prvotne lastnosti laboratorijsko postaranemu bitumnu. S postopkom pirolize smo izdelali več različnih produktov tako, da smo spreminjali čas trajanja in temperaturo pirolize. Med novo razvitimi produkti smo izbrali najprimernejšega za namen alternativnega pomlajevalca in preverjali njegov vpliv v različnih koncentracijah (3 %, 5 %, 10 % in 20 % glede na maso bitumna) na lastnosti svežega in laboratorijsko staranega bitumna. S pomočjo standardnih mehanskih raziskav, reoloških raziskav in reološkega modeliranja smo dokazali, da alternativni pomlajevalec izboljša lastnosti staranega bitumna.
Ključne besede: pomlajevalec, piroliza, asfaltni granulat, reologija, visokoelastične lastnosti
Objavljeno v DiRROS: 04.12.2023; Ogledov: 190; Prenosov: 57
.pdf Celotno besedilo (1,81 MB)
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5.
Karakterizacija s polimeri modificiranih bitumnov z reološkimi preiskavami
Mojca Ravnikar Turk, Lidija Ržek, Marjan Tušar, 2021, izvirni znanstveni članek

Povzetek: Cestne povezave morajo biti odporne proti podnebnim in prometnim obremenitvam, intervali vzdrževanja asfaltnih vozišč pa čim daljši. Zato naftna industrija razvija vedno bolj odporne bitumne za cestogradnjo, hkrati pa se uveljavljajo nove preiskave, s katerimi lahko obnašanje bitumnom celovito ovrednotimo. Za karakterizacijo s polimeri modificiranih bitumnov (PmB) osnovne preiskave trdote in zmehčišča, ki se že dolga leta uporabljajo, ne zadoščajo. Zato se določajo tudi reološke karakteristike. Za karakterizacijo se uporablja dinamični strižni reometer, s katerim v kontroliranih pogojih napetosti in deformacij na majhnih vzorcih bitumna določamo viskoelastične in plastične lastnosti vzorcev bitumna. V prispevku so prikazani rezultati osnovnih in reoloških preiskav s polimeri modificiranih bitumnov različnih trdnostnih razredov, ki se uporabljajo v slovenskem prostoru.
Ključne besede: s polimeri modificiran bitumen, reologija, DSR, MSCRT
Objavljeno v DiRROS: 04.12.2023; Ogledov: 190; Prenosov: 83
.pdf Celotno besedilo (2,44 MB)
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Increasing the rate of recycled asphalt : an experimental study
Marjan Tušar, Lidija Ržek, 2014, izvirni znanstveni članek

Ključne besede: reclaimed asphalt, recycling, rejuvenator, asphalt plant
Objavljeno v DiRROS: 31.07.2015; Ogledov: 4596; Prenosov: 599
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