ORALS

SESSION: AdvancedMaterialsWedAM-R8	4th Intl. Symp. on New and Advanced Materials and Technologies for Energy, Environment and Sustainable Development
Wed Nov, 7 2018 / Room: Grego (50/3rd)
Session Chairs: Michael Potesser; Session Monitor: TBA

11:45: [AdvancedMaterialsWedAM02]
Advanced Experimental Design and Optimization Methods for New Building Materials Developed in Civil Engineering
Daniel Lepadatu¹ ; Loredana Judele¹ ; Ion Antonescu¹ ; ¹Technical University Gheorghe Asachi of Iasi, Faculty of Civil Engineering and Building Service, IASI, Romania;
Paper Id: 176 [Abstract]

In civil engineering, the development of new materials has been highly dynamic, when taking into account the progress of research as well as the high demand driven by society. Due to the constantly diminishing primary natural resources, the global economy is increasingly focusing on recycling waste and reintroducing it into the circuit of creating new materials with improved properties. In this context, the current paper aims to present advanced experimental designs and optimization methods as alternatives to existing ones, as they not only involve very high additional costs, but whose capacity is also being surpassed. Thus, we present a set of methods that by their specific nature contribute to diminishing the time of the research, development, and obtaining of new materials, but also to the drastic reduction of the costs related to the experimental calibration. "It's about Design of Experiments", together with "Response Surface Methodology", offers to researchers an advanced approach to experimental designs with the possibility of quantifying the influence of different factors on this process, and the needed combination to optimize certain characteristics of them. Artificial Neural Networks are another way to obtain this time by learning from the examples of the required combination to optimize. A comparison of the two methods will also be presented. All these will have both a theoretical approach and also one based on the scientific work of the authors, and not only using these methods. Thus, the new materials developed in civil engineering will be produced using experimental design adapted to the complexities of physical phenomena, which are often unknown, involved in this process, and also optimizing their properties by obtaining some characteristics that respond to the requirements of safety, security, and durability.

References:
[1] Douglas C. Montgomery, Design and Analysis of Experiments, John Wiley & Sons, (2012).
[2] Bliuc I., Lepadatu D., Iacob A., Judele L., Bucur, R. D. Assessment of thermal bridges effect on energy performance and condensation risk in buildings using DoE and RSM methods European Journal of Environmental and Civil Engineering, Taylor & Francis, 21 (2017) 1466-1484.
[3] Barbuta M, Marin E., Cimpeanu S. M., Paraschiv G., Lepadatu D., and Bucur R. D., Statistical Analysis of the Tensile Strength of Coal Fly Ash Concrete with Fibers Using Central Composite Design, Advances in Materials Science and Engineering, Volume (2015) 7 pp.
[4] Samarasinghe S, Neural Networks for Applied Sciences and Engineering: From Fundamentals to Complex Pattern Recognition, by Auerbach Publication, (2012).
[5] Lepadatu D, Barbuta M., et all., Mechanical characteristic prediction on polymer concrete with silica fume using artificial neural network, Proceedings of 14th SGEM GeoConference on Nano, Bio And Greena-Technologies, Vol. 2 (2014) 235-242.

SESSION: AdvancedMaterialsWedAM-R8	4th Intl. Symp. on New and Advanced Materials and Technologies for Energy, Environment and Sustainable Development
Wed Nov, 7 2018 / Room: Grego (50/3rd)
Session Chairs: Michael Potesser; Session Monitor: TBA

12:10: [AdvancedMaterialsWedAM03]
Modern Methods of Determining Road Bitumen Adhesiveness to Natural Aggregates
Loredana Judele¹ ; Daniel Lepadatu¹ ; Iulian Cucos² ; Mihaela Movila¹ ; ¹Technical University Gheorghe Asachi of Iasi, Faculty of Civil Engineering and Building Service, IASI, Romania; ²Technical University Gheorghe Asachi of Iasi, Faculty of Hydrotechnical Engineering, Geodesy and Environmental Engineering, IASI, Romania;
Paper Id: 186 [Abstract]

Asphalt coatings are preferred for the construction and/or rehabilitation of highways. They are very common in the world, and have the advantage of being more easily executed and maintained than cement concrete. The use of new technologies using added and/or modified bitumen, fiber additions (cellulose, synthetics, etc.) has been observed in recent years, allowing for improved performance in terms of increased lifetime and widening the thermal domain where the mix improves its properties. Adhesion between bitumen and natural aggregates is a key factor in the service life of wearing courses. Very often, the cause of the defects appearing on the surface of the road can be attributed to an inadequate adhesiveness between the bitumen and the natural aggregates. The main function of the bitumen is to act as an adhesive, and its good adhesiveness to the mineral aggregate is essential for obtaining a mixture of high quality asphalt. The need to ensure a link between aggregates and asphalt is very important and that is why we use, more and more often, the doping of bitumens, namely to add small amounts additive (0.1-0.5%) in the bitumen mass. Analyzing and assessing wetted materials in the laboratory is not an easy mission. They are based especially on the expert opinion (assessment) of the technician that performs the assays, even if some of the mechanical characteristics are quantified or standardized. Although the incidence of premature failure due to adhesiveness is relatively rare, fractures can involve significant costs when they occur. The goal of this research is to compare the adhesiveness results of a set of bitumen (achieved through quantitative determination method and Rolling Bottle Method (RBM) like classic methods) to the results achieved through experimental trials on the same set using the "Average Percentages of Black" (APB) method and PHP program. Not only are the two sets of results compared, but also the two methods—a traditional and a modern one, each with their own advantages and disadvantages.

References:
[1] Nasler I., H. Beckedahl, Adhesion between aggregates and bitumen - performance testing of compacted asphalt specimens by means of the dynamic indirect tensile test, Euroasphalt&Eurobitume Congress; Barcelona (2000).
[2] Gugiuman G. Bitume routier avec adjouvant- Euroasphalt&Eurobitume Congress; Barcelona (2000).
[3] Mohammad I. Hossain, Rafiqul A. Tarefder, Determination of Adhesive and Cohesive Damages in Asphalt Concrete by Finite Element Method, International Journal of Civil Engineering and Structures, ISSN: 2160-6676, 1,1, (2012).
[4] Judele L., M. Barbuta, D. Lepadatu, Structure and role of additive in bitumen adhesion to natural aggregates, 14th SGEM GeoConference on Nano, Bio And Green - Technologies For A Sustainable Future, Vol. 2, No. SGEM2014 Conference Proceedings, ISBN 978-619-7105-21-6, 2, (2014), 307-314.
[5] Judele L., THE MECHANISM OF BITUMEN ADHESION TO AGGREGATES THE INFLUENCE OF MINERALOGYC NATURE, Bulletin of the Polytechnic Institute of Iassy, Tom LVII(LXI), 2, (2011), 175-181.