This paper presents an experimental study to evaluate the possibility of CEM IV 42,5N producing by increasing the specific cement surface from 3180 to 3850 cm2 /g. In this paper, fly ash is used as a cement admixture because fly ash possesses both hydraulic and pozzolanic properties. If one part of the clinker, as a major cement admixture, is repla...

By Nevzet Merdić, Nedžad Haračić, Ilhan Bušatlić, Nadira Bušatlić, Amna Karić

The presented investigation work investigates thermal properties of the ultra-high hardness (UHH) armour steel. Steel is distinguished with high hardness and strength. It is sold in the quenched or tempered state, because achieving planned hardness which has to be between 590 HB and 640 HB. In the frame of the investigation work the analysis of the...

By Borut Kosec, Tjaša Kranjec, Blaž Karpe, Aleš Nagode, Milan Bizjak, Jure Bernetič, Mirko Gojić, Zijah Burzić, Milan Rimac, Gorazd Kosec

Some specific aspects in the improvement processes related to I-beams production, especially related to the conversion of classical to the universal rolling mills stands are presented in this paper. One of practical solutions in the a.m. conversion is described in some more details, as well as some of better designs in the variety of I-beams, conce...

By Faik Uzunović, Omer Beganović, Lamija Sušić

In this paper, we have introduced new contemporary materials for heat harvesting, based on thermoelectric effect (or Seebeck effect): rear earth mono-pnictides and graphene. Measure of effectiveness for transformation of heat to electricity is represented with zT factor, which measure heat harvesting potential. zT factor is related with heat and el...

By Siniša M. Vučenović, Jovan P. Šetrajčić, Steva K. Jaćimovski

The paper examined the changes in properties of conventional castables composed of a mixture of calcium-aluminate cement and chamotte caused by changes in the particle size distribution. Properties of castable with 20 % cement and „as received“ chamotte were compared with castableofparticle size distribution adapted to the calculated di...

By Marina Jovanović, Adnan Mujkanovic

Mostly used food packing are: paper, cartoon, plastics, glass, metals and multilayer materials. The plastics and paper/cartoon make about 70% of all food packing. These two have the biggest migration potential. The use of plastics is regulated by specific EU rules, but it is not yet the same about the use of paper packing. In order to ensure health...

By Benjamin Muhamedbegović, Midhat Jašić, Marizela Šabanović, Faik Uzunović

In this paper were investigated the effect of hydrochloric acid concentration and addition of oxidizing agents on the rate of general corrosion of copper.For comparison, the corrosion rate in distilled water was also tested.Taffel extrapolation method was used for investigation of general corrosion of copper. Taffel extrapolation method implies sca...

By Farzet Bikić, Dejana Kasapović

Thermal properties and microstructure of the Sn-10% Ag and Sn-20% Ag alloys were experimentally investigated in this study. Melting behavior of the alloys were studied using differential scanning calorimetry (DSC). Microstructure of the alloys was analyzed by optical microscopy. The xenon-flash method was used for the measurements of thermal diffus...

By Dragan Manasijević, Ljubiša Balanović, Ivana Marković, Duško Minić, Aleksadar Đorđević

Surface roughness is the totality of microgeometric irregularities on the surface of an object and it is caused by various factors, from which the most important are machining and processing techniques. This characteristic of the material is very important, especially in the case of high-quality materials designed for the demanding conditions of ex...

By Raza Sunulahpašić, Mirsada Oruč, Edina Karić

The paper describes the behavior of welded joints of NN-70 steel in the presence of a cracking error when bending with impact force. The experiment was performed with three groups of test tubes, depending on the cut-off point of the test tube notch with the tip of the crack in BM, in WM and in HAZ. The test method used was conducted on the instrume...

By Nermin Bišćević