The state of dispersion, the viscoelastic properties and the mechanical properties (such as Young's modulus, ductibility, penetration, and Fraas breaking point) of polymer-modified bitumen are investigated. Bitumen was modified with low-density polyethylene from processed bags (PE bags ) and styrene-butadiene random block copolymer (SBR). The blends were characterized by optical microscopy, dynamic mechanical thermal analysis (DMTA), and other conventional methods. Photomicrographs indicated that different morphologies were obtained; PE bags gave dispersions with almost spherical polymer particles; whereas in the case of SBR, fibrillar domains were observed. DMTA measurements indicated significant changes of the storage and loss moduli of modified bitumen; depending on the polymer content in the bitumen matrix, these values were three to four times higher compared with neat bitumen. Blends with SBR showed a significantly increased resistance to cracking at low temperatures due to decrease of the glass transition temperature from À14 to À34 C. Contrary, PE bags gave better results at higher temperatures where as a result of the increased resistance to permanent deformation the softening point of modified bitumen was shifted from 52 to 73 C. It was also investigated the influence of mixtures of PE bags /SBR on the properties of bitumen as function of the composition and ratio between PE bags and SBR. It was found that the best improvement in deformation resistance, permanent deformation, and cracking of bitumen was achieved with the addition of PE bags /SBR mixture as the rubber increased the bitumen properties at low temperatures and the polyolefin at high temperatures.
All graphic material: Authors of proceedingsCover design: Jan Perša (University of Maribor Press) Design and Layout: University of Maribor Press © University of Maribor PressAll rights reserved. No part of this book may be reprinted or reproduced or utilized in any form or by any electronic, mechanical, or other means, now known or hereafter invented, including photocopying and recording, or in any information storage or retrieval system, without permission in writing from the publisher. Teaching is a challenging but also a rewarding profession. It is underpinned by one key question: how do we build a good teaching and learning environment so that our students can acquire professional competences which will enable them to be successful in today's global business environment. CIP -Kataložni zapis o publikacijiThese proceedings include the papers presented at the 1 st International Scientific Conference »Teaching Methods for Economics and Business Sciences« held on 8 May 2017 at the University of Maribor, Faculty of Economics and Business. The papers address students' learning outcomes, the development and measurement of students' professional and transversal competences and skills, creative teaching and learning techniques such as brainstorming and creative problem solving, active learning and collaborative learning, students' self-assessment of their learning, experiential learning and lifelong learning, practical teaching methods such as business simulations, action-based learning and knowledge integration, innovations and sustainability of different teaching methods, non-formal learning and teaching activities for vocational competences development, ethical aspects of creating a good student environment, capacity building, students' learning styles, teaching styles, students' creativeness, and, last but not least, students' academic success and their personal wellbeing.These papers provide valuable insights into academic teaching practice and contribute to the answer to the above question. This paper examines the relationship and inter-connectivity between the fundamental building blocks of the Bologna process. It identifies the key words for the implementation and monitoring of the basic principles of Bologna and charts the sea-change from an 'inputs' dominated curriculum to an 'outcomes and achievement' philosophy. In addition, it gives guidelines for the successful use of the key indicators, an approach which is consistent with the Guidelines for European Standards (2015) as promulgated by ENQA and its members. Bologna -basic structureBologna is underpinned by the measurement of the learning which takes place and the successful demonstration of its achievement. This has two facets, namely volume and level. The volume is measured by the number of ECTS credits -basic standard is 60 credits per full-time year of successful study. This could be two semesters, three terms or the equivalent for part-time and e-learning programmes. Number of creditsThe standard measure against which all credit-rating is based ...
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.