THE EFFECTS OF THE DISTRIBUTION COEFFICIENT ON THE PROPERTIES OF THE REFRACTORY CASTABLES FROM THE CHAMOTTE WASTE AND CLAY “RAPAJLO”
The paper examined the conventional castables composed of a mixture of high aluminate cement with 70% Al2O3, chamotte waste with 42% Al2O3 and brick clay ,,Rapajlo“. The influence of particle size distribution on density, porosity, water absorption, modulus of rapture and cold crashing strength was investigated. Particle size distribution was...
By Marina Jovanović, Adnan Mujkanović, Nadira Bušatlić
PROGNOSIS OF REACTIVITY AND STRENGTH OF COKE BASED ON MODIFIED BASICITY INDEX MODEL
Metallurgical coke, as a fuel and a reducing agent, also allows for the gas to go through a charge in the blast furnace. The coke must have a strength, porosity, reactivity and a uniform granulation, because reaction of CO2 at high temperatures in the furnace. There are various mathematical models for the optimization of coal blend, which allow the...
By Sulejman Muhamedagić, Mirsada Oruč, Admir Muminović, Amina Kurtović
CAVITATION OF REFRACTORY SAMPLES BASED ON TALC AND ZEOLITE FROM ZLATOKOP, SERBIA
Samples based on talc with 15 % of zeolite from Zlatokop, Serbia, sintered at 1200 ºC were prepared and tested in condition of cavitation erosion. The ultrasonic vibratory cavitation set up with stationary specimen was used. Mass loss was measured and degradation level of the samples using image analysis and Young modulus of elasticity was mon...
By Jelena Majstorović, Sanja Martinović, Milica Vlahović, Marina Dojčinović, Marko Pavlović, Tatjana Volkov Husović
THE EFFECTS OF NANOSILICA ON THE PHYSICAL-MECHANICAL PROPERTIES OF CONCRETE
The physical-mechanical properties of concrete with nanosilica were experimentally studied. Nanosilica in powder form was used as a partial replacement of cement at dosage of 3 and 6 wt.%. The experimental results show that the compressive strengths of concretes with nanosilica particles were all higher than those of reference concretes at ages 1, ...
By Adnan Mujkanović, Marina Jovanović, Amel Zahirović
OPTIMIZATION OF PROCESS PARAMETERS IN THE PRODUCTION OF POWDERED EXPLOSIVES IN PS VITEZIT
Parameter monitoring and testing of explosive substances under certain conditions, as well as control of raw materials used in the production process, contributes to obtaining the finest quality product.The aim of this paper was to test the key parameters in the process of explosive production and compare the results with the standard (reference) v...
By Šefkija Botonjić, Azra Halilović, Irma Ramić
THE INFLUENCE OF THE PHOSPHORIC ACID AND CLAY ON THE PHYSICAL AND MECHANICAL PROPERTIES OF REFRACTORY CONCRETE
In recent decades, the interest in refractory materials which are formed without baking - by chemicalbonding - has increased significantly, as their production is less complex and more economical thanthe production of classical refractory materials, which involves a long baking process. In this work,as a chemical binder, phosphoric acid, which is i...
By Nadira Bušatlić, Ilhan Bušatlić, Nedžad Haračić, Nevzet Merdić
THE INFLUENCE OF CLINKER DUST ON BLAST FURNACE CEMENT PROPERTIES
Clinker dust or cement kiln dust (CKD) is fine granulated material which generate during the thermal treatment of raw meal and during the clinker cooling process. By applying different methods in certain stages of the technological process it is possible to extract the mentioned dust. The chemical composition of the clinker dust depends on type and...
By Nevzet Merdić, Nedžad Haračić, Ilhan Bušatlić, Nadira B Bušatlić, Zehrudin Osmanović, Nisad Avdić
SEPARABILITY OF DISCRETE OPTICAL PROPERTIES OF MOLECULAR CRYSTALLINE NANOSTRUCTURES
This paper presents a model of molecular ultrathin (nano) crystalline film and feature research methodology of exciton system as well as analysis of dielectric properties of these spatially very restricted structures with perturbed fundamental parameters on surfaces. Using the two-time Green's functions, adapted for research of symmetry breaking cr...
By Siniša M. Vučenović, Jovan P. Šetrajčić
THE INFLUENCE OF THE ADDED AMOUNT OF GYPSUM ON THE PORTLAND CEMENT HYDRATION HEAT
Gypsum is added to the Portland cement clinker in the amount of 3 to 5% in the grinding phase as the binding rate regulator. When it comes to the hydration of cement, if sufficient amount of gypsum is added, fast cementation will not occur because gypsum by its presence reduces the solubility of tricalcium aluminate and thus slows down rapid reacti...
By Ilhan Bušatlić, Amna Karić
HIGH-STRENGTH CONCRETE (HSC) MATERIAL FOR HIGH-RISE BUILDINGS
Successful examples of high–rise buildings in the world are obvious evidences that the use of high–strength concrete is nowadays reality in construction worldwide. Whether focus on high–rise buildings up to 15– 24 storeys, or the super tall high–rise buildings that are few hundred of storeys high, high–strength c...
By Ilda Kovačević, Sanin Džidić