o:917 Efect of the waste materials addition on psycalmechanical properties of cement mortar en The paper presents a study on the use of waste materials from Thermal Power Plants in Serbia as replacement components in cement mixtures. In this way, the quantities and costs of their deposition could be reduced, and thus the negative impact on the land, soil, air and environment could be minimized. The main aim of our research was the comparison of compressive and flexural strengths of the cement mortars with the addition of the fly ash from the Thermal Power Plant Kostolac B and slag from the blast-furnace of the Železara in Smederevo (HBIS Group Iron & Steel). The experimental procedure included tests on the standard mortar samples prisms (4x4x16 cm), and also on the small (laboratory) prisms of size 1x1x6 cm. In order to choose proper quantities of the waste materials, their in-depth characterization was performed: determination of total moisture, granulometric composition, pH value, chemical composition, specific mass, pozzolanic activity, XRD and SEM. Based on the gained results, preparation of the cement mortar mixtures was done by replacing the standard mortar mixtures with 10 mas% of the fly ash or the blast furnace slag. The mechanical properties of the prepared systems: standard cement mortar, cement mortar with 10 mas % cement replacement with fly ash or blast furnace slag, were examined after 28 days and 8 months of hydration. Based on the compressive and flexural strength values, it was noted that the systems with cement replacement by fly ash (10 mas. %) possess better mechanical characteristics compared to the standard cement mortar. In the case of cement replacement with 10 mas. % of slag, the mechanical properties were approximately the same as the values gained for the standard cement mortar. The obtained results proved that the waste materials from Thermal Power Plants, Serbia can successfully replace 10 mas. % of the cement in the standard cement mortars mixture, which is more than beneficial both from economic and environmental point of view Identifikator monografske publikacije: ISBN 978-86-6253-160-5 Fly ash, Slag, Cement, Compressive and flexural strength 2022-11-02T11:08:55.226Z 44 no 46 Јасмина Нешковић Рударски институт Београд Дамир Чјепа Lafarge BFC doo, Beočin person Мирослав Драмићанин Faculty of Technical Sciences Novi Sad person Снежана Вучетић Faculty of Technology Novi Sad person 978-86-6253-160-5 Јоњауа Раногајец Faculty of Technology Novi Sad person application/vnd.openxmlformats-officedocument.wordprocessingml.document 21914 https://unilib.phaidrabg.rs/o:917 no yes 1 70 92000004 71A02 2nd International Conference on Advanced Production and Processing, Novi Sad 118 Book of abstracts Novi Sad, Bulevar cara Lazara 1 Faculty of Technology Novi Sad 2022