1. Rheological behaviors of waste polyethylene modified asphalt binder : Statistical analysis of interlaboratory testing resultsDi Wang, Andrea Baliello, Gustavo Pinheiro, Lily D. Poulikakos, Marjan Tušar, Kamilla Vasconcelos, Muhammad Rafiq Kakar, Laurent Porot, Emiliano Pasquini, Gaspare Giancontieri, Chiara Riccardi, Marco Pasetto, Davide Lo Presti, Augusto Cannone Falchetto, 2023, original scientific article Abstract: This article investigated the effect of waste polyethylene (PE) on the modified asphalt binders’ rheological behavior from a statistical point of view. The interlaboratory testing results from the RILEM Technical Committee 279 Valorization of Waste and Secondary Materials for Roads Task Group 1 were used for this purpose. First, an unaged 70/100 penetration graded neat binder was selected as the reference material. Next, a single 5 % content of waste PE additives (PE-pellets and PE-shreds) was mixed with a 95 % neat binder to prepare two PE modified binders. Then, dynamic shear rheometer–based temperature-frequency sweep tests were performed over a wide range of temperatures and frequencies to evaluate the rheological properties of these three binders. Different rheological behaviors were observed in the isochronal plots at high temperatures. Based on a reproducibility precision requirement proposed for phase angle, 28°C was set as the transition temperature across the rheological behaviors. Next, according to the three rheological behaviors defined in a previous study by the authors, statistical analysis was introduced to identify sensitive rheological parameters and determine the thresholds. Results indicate that the phase angle measured above 28°C and 1.59 Hz can be used as a sensitive parameter to discriminate the three rheological behaviors of PE modified binders. The thresholds among different behaviors were also calculated as an example for phase angle measured at the highest common testing temperature of 70°C. Additional experimental evaluations on more types of PE modified binders, especially at intermediate and high temperatures, are recommended to better understand their influence on the rheological behavior of PE modified binders.
Keywords: bitumen, polietilen, reologija, medlaboratorijska primerjava
Published in DiRROS: 20.02.2024; Views: 135; Downloads: 61
 Full text (1,19 MB)
This document has many files! More... |
2. Reološko ovrednotenje alternativnega pomlajevalca, pridobljenega iz odpadnih snoviLidija Ržek, 2019, original scientific article Abstract: 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.
Keywords: pomlajevalec, piroliza, asfaltni granulat, reologija, visokoelastične lastnosti
Published in DiRROS: 04.12.2023; Views: 228; Downloads: 75
Full text (1,81 MB)
This document has many files! More... |
3. Karakterizacija s polimeri modificiranih bitumnov z reološkimi preiskavamiMojca Ravnikar Turk, Lidija Ržek, Marjan Tušar, 2021, original scientific article Abstract: 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.
Keywords: s polimeri modificiran bitumen, reologija, DSR, MSCRT
Published in DiRROS: 04.12.2023; Views: 230; Downloads: 100
Full text (2,44 MB)
This document has many files! More... |
