vol. 67, no. 4 § 2015/4 § építôanyag § JSBCM | 143 építôanyag § Journal of Silicate Based and Composite Materials methods and equipment for the investigation of rheological properties of complex materials like convectional brick clays and ceramic reinforced composites l. a. GömZE § university of miskolc institute of ceramics and Polymer engineering § femgomze@uni-miskolc.hu l. n. GömZE § igrex engineering service Ltd. igrici, Hungary § igrex2009@yandex.ru n. S. KULKoV § tomsk state university, russia l. i. ShABALIN § university of salford, united kingdom i. GoTmAN § university of technion, israel f. PEDRAZA § university of La rochelle, France g. l. LEComTE § université de Limoge - ensci, France t. mAyoRoVA § syktyvkar state university, russia e. KURoVICS § university of miskolc institute of ceramics and Polymer engineering a. hAmZA § university of miskolc institute of ceramics and Polymer engineering érkezett: 2015. 08. 01. § received: 01. 08. 2015. § http://dx.doi.org/10.14382/epitoanyag-jsbcm.2015.24 Abstract in the present work two special instruments are described and introduced which were developed for the rheological tests of materials like minerals, raw materials and semi-finished products of ceramic industry or complex materials like ceramic particles and fibre reinforced metal alloys and hetero-module, hetero-viscous and hetero-plastic materials with increased dynamic strength. the working principles of introduced ‘rheotesters’ are relatively simple and easy for use to determine rheological parameters like instantaneous elastic modulus, delayed elastic modulus or viscosity of damaged and undamaged material structures. the instruments give the opportunity to easily and quickly prepare the rheological model of tested materials. keywords: ceramics, composites, instrument, modulus of elasticity, rheology, viscosity kulcsszavak: kerámiák, kompozitok, vizsgáló berendezés, rugalmassági modulus, reológia, viszkozitás László A. GöMZE is establisher and former head of Department of ceramics and silicate engineering in the university of miskolc (Hungary). Author or co- author of 2 patents, 5 books and more than 250 scientific papers. Ludmila N. GöMZE is msc (civil engineer), managing director of the iGreX engineering Ltd. Author or co-author more than 30 scientific papers. Sergey N. kULkOV is head of Department of ceramics in the institute of strength Physics and materials science of the russian Academy of science Author of 5 books, more than 150 articles and 18 patents. Igor ShABALIN is member of the materials and Physics research centre at university of salford (united kingdom). He has a wide range experience in research of various high-temperature/hard ceramic and composite materials. Irena GOTMAN is a senior research and teaching Fellow at Department of materials science & engineering at technion as a Levi eshkol Post-doctoral Fellow. she is a member of european society for Biomaterials (esB). Fernando PEDRAZA is a professor at Laboratoire des sciences de l’ingénieur pour l’environnement in the université de La rochelle (France). vice-president of université de La rochelle and responsible for the international relations. Giséle LECOMTE-NANA is a member of the Groupe d’etude des matériaux Hétérogčnes (GemH), ecole nationale supérieure de céramique industrielle, centre europé en de la céramique (France). Author or co-author of 36 scientific papers. Tatiana MAYOROVA is working at institute of Geology, komi science centre, ural Division, russian Academy of sciences, syktyvkar (russian Federation). she has considerable success in research of gallium and gold deposits. Emese kUROVICS is a student of the Faculty of materials science and engineering at university of miskolc and preparing her diploma thesis under the supervision of Prof. Gömze. Alexandra hAMZA is a student of the Faculty of materials science and engineering at university of miskolc and carrying out her research under the supervision of Prof. Gömze. 1. Introduction Tere are many scientifc works can be found recently for the investigation of rheological properties of materials in nanoscale [1-4]. Nevertheless, it is quite difcult to determine in macro-scale the most important rheological parameters of complex materials like ■ mined convectional brick clays, ■ concrete mixtures reinforced with fbres, ■ asphalt pavements and asphalt concretes, ■ ceramic particles and ceramic fbre reinforced metallic matrix composites, ■ hetero-module, hetero-viscous and hetero-plastic complex materials. During the production of ceramics and ceramic reinforced composites it is obvious that the chemical and structural transformations in the materials are taking place as reactions in solid phase [5-10]. At a certain temperature and chemical or mineralogical composition the rate of these solid phase reactions are very high depending on the concentration of components and the volumes of their contact surfaces. Due to these, one of the most important technological goals during the production of convectional bricks, ceramic roof tiles, technical ceramics and ceramic reinforced composite materials is to give specifc surface area as large as possible for the used raw materials during their crushing and comminuting. Te achieved specifc surface area of the components has very strong infuence not only on forming processes and quality but on the required energy consumption of heat treatment or fring as well [11-15]. To get the necessary magnitude of specifc surfaces of the raw materials the required energy consumption depends not only on their chemical and mineralogical