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Prof. Dr. Mirjana Malešev
University of Novi Sad, Faculty of Technical Sciences, Department of Civil Engineering and Geodesy

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Research Keywords & Expertise

0 Cementitious Materials
0 Recycled materials for civil engineering
0 Durability of Concrete
0 Assessment of structures
0 Repair of Structures

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Journal article
Published: 20 February 2021 in Materials
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A sustainable use of locally available wastes from agriculture as supplementary cementitious materials (SCMs) is an alternative solution for the prevention of excessive raw material usage, reduction of CO2 emission and cost-effective concrete production. This paper studies the reactivity of non-traditional waste SCMs: Wheat straw ash (WSA), mixture of wheat and soybean straw ash (WSSA) and soybean straw ash (SSA), which are abundant as agricultural by-products in Serbia. The chemical evaluation using XRF technique, thermal analysis (TGA/DSC), XRD and FTIR methods were performed along with physical properties tests to investigate the feasibility of utilizing biomass ashes as cement substitutes. The obtained results demonstrate a high pozzolanic activity of WSA, which is attributed to a high reactive silica content of the ash and its satisfactory level of fineness. A wider hump in XRD pattern of WSA compared to WSSA and SSA confirmed that it abounds in amorphous (reactive) phase. The insufficient activity index of soybean-based biomass ashes, characterized with a low silica content, was improved by additional grinding and/or blending with amorphous silica-rich material. This points out the mechanical activation, i.e., grinding procedure, and chemical activation, i.e., modification of the chemical composition, as techniques efficient at producing pozzolanic materials from biomass wastes. Tested biomass ashes are characterized with negligible leaching values of heavy metals, thereby satisfying eco-friendly principles of SCM utilization. The application of biomass ashes as SCMs leads to substantial cost savings, as well as benefits to the environment, such as lower consumption of cement, reduction of CO2 emissions during the production of cement and sustainable waste management.

ACS Style

Slobodan Šupić; Mirjana Malešev; Vlastimir Radonjanin; Vesna Bulatović; Tiana Milović. Reactivity and Pozzolanic Properties of Biomass Ashes Generated by Wheat and Soybean Straw Combustion. Materials 2021, 14, 1004 .

AMA Style

Slobodan Šupić, Mirjana Malešev, Vlastimir Radonjanin, Vesna Bulatović, Tiana Milović. Reactivity and Pozzolanic Properties of Biomass Ashes Generated by Wheat and Soybean Straw Combustion. Materials. 2021; 14 (4):1004.

Chicago/Turabian Style

Slobodan Šupić; Mirjana Malešev; Vlastimir Radonjanin; Vesna Bulatović; Tiana Milović. 2021. "Reactivity and Pozzolanic Properties of Biomass Ashes Generated by Wheat and Soybean Straw Combustion." Materials 14, no. 4: 1004.

Journal article
Published: 01 January 2021 in Chemical Industry and Chemical Engineering Quarterly
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The durability of concrete infrastructure is related to the properties of the applied concrete and the effects of the aggressive external environment on it. When concrete is directly exposed to soft water, the leaching of calcium ions from hardened cement or cement-based pastes occurs, causing reduction in strength and further deterioration of the concrete structure. This paper presents the experimental results of soft water attack effects on phase composition and compressive strength of blended cement pastes, when cement is replaced with 0%, 10%, 20% and 30% of natural zeolite. In order to simulate soft water attack in laboratory conditions, paste specimens were exposed to leaching in deionised water up to 180 days. The evaluation of the changes in phase composition (ettringite, portlandite, calcium silicate hydrate gel) due to calcium ion leaching was made based on X-ray diffraction analysis, Fourier transform infrared spectroscopy and paste compressive strength tests. The presence of portlandite and ettringite after 180 days of exposure to deionised water indicates that leaching did not influence the stability of the hydration products in blended cement pastes. Moreover, blended cement paste with 10% of natural zeolite had a higher compressive strength than the reference one.

ACS Style

Tiana Milovic; Ognjen Rudic; Omran Saeeda Furgan; Miroslava Radeka; Mirjana Malesev; Vlastimir Radonjanin; Sebastian Balos; Mirjana Laban. Effects of soft water attack on Portland and natural zeolite blended cements. Chemical Industry and Chemical Engineering Quarterly 2021, 9 -9.

AMA Style

Tiana Milovic, Ognjen Rudic, Omran Saeeda Furgan, Miroslava Radeka, Mirjana Malesev, Vlastimir Radonjanin, Sebastian Balos, Mirjana Laban. Effects of soft water attack on Portland and natural zeolite blended cements. Chemical Industry and Chemical Engineering Quarterly. 2021; (00):9-9.

Chicago/Turabian Style

Tiana Milovic; Ognjen Rudic; Omran Saeeda Furgan; Miroslava Radeka; Mirjana Malesev; Vlastimir Radonjanin; Sebastian Balos; Mirjana Laban. 2021. "Effects of soft water attack on Portland and natural zeolite blended cements." Chemical Industry and Chemical Engineering Quarterly , no. 00: 9-9.

Journal article
Published: 08 September 2020 in Applied Sciences
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The aim of the research presented in this paper is the experimental confirmation of the numerically defined shapes of the Strut-and-Tie models, designed according to the EN 1992-1-1 recommendations, and obtained from the software “ST method”. Three reinforced concrete deep beams with openings were tested. Each of them had the same dimensions and quality of the material characteristics. The specimens, constructed as simply supported beams, were loaded with two concentrated forces and were tested for bending until failure. Each specimen was reinforced with different reinforcement layout determined by variation parameter β, incorporated in the software “ST method”. For the determination of the Strut-and-Tie models, all of the reinforcement layouts were equally favored in the first specimen (β = 1.0 for 0°, 45°, and 90°), only the horizontal direction was favored in the second (β = 1.0 for 0°), while in the third specimen the one at the angle of 45° (β = 1.0 for 45°). Based on the results of experimental research, it was concluded that the behavior of loaded members was in agreement with the proposed shapes of the Strut-and-Tie models that were used for their design, and it was confirmed that the program “ST method” can be used for obtaining Strut–and-Tie models.

ACS Style

Anka Starčev-Ćurčin; Andrija Rašeta; Mirjana Malešev; Danijel Kukaras; Vlastimir Radonjanin; Miloš Šešlija; Drago Žarković. Experimental Testing of Reinforced Concrete Deep Beams Designed by Strut-And-Tie Method. Applied Sciences 2020, 10, 6217 .

AMA Style

Anka Starčev-Ćurčin, Andrija Rašeta, Mirjana Malešev, Danijel Kukaras, Vlastimir Radonjanin, Miloš Šešlija, Drago Žarković. Experimental Testing of Reinforced Concrete Deep Beams Designed by Strut-And-Tie Method. Applied Sciences. 2020; 10 (18):6217.

Chicago/Turabian Style

Anka Starčev-Ćurčin; Andrija Rašeta; Mirjana Malešev; Danijel Kukaras; Vlastimir Radonjanin; Miloš Šešlija; Drago Žarković. 2020. "Experimental Testing of Reinforced Concrete Deep Beams Designed by Strut-And-Tie Method." Applied Sciences 10, no. 18: 6217.

Preprint
Published: 05 August 2020
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This paper presents the results of the experimental research and numerical analysis of three reinforced concrete deep beams with openings, designed by the Strut-and-Tie method according to the EN 1992-1-1 recommendations. All tested specimens were made in full size, with the same geometric characteristics and quality of the materials. The specimens, constructed as simply supported beams, were loaded with two concentrated forces and were tested for bending until failure. Each specimen was reinforced with different reinforcement layout determined by parameter variation within the Strut-and-Tie method. Based on the results of experimental research, it was concluded that the behavior of loaded members was in agreement with the proposed forms of the Strut-and-Tie models that were used for their design.

ACS Style

Anka Starčev-Ćurčin; Andrija Rašeta; Mirjana Malešev; Danijel Kukaras; Vlastimir Radonjanin; Miloš Šešlija; Drago Žarković. Experimental Testing of Reinforced Concrete Deep Beams Designed by Strut-and-Tie Method. 2020, 1 .

AMA Style

Anka Starčev-Ćurčin, Andrija Rašeta, Mirjana Malešev, Danijel Kukaras, Vlastimir Radonjanin, Miloš Šešlija, Drago Žarković. Experimental Testing of Reinforced Concrete Deep Beams Designed by Strut-and-Tie Method. . 2020; ():1.

Chicago/Turabian Style

Anka Starčev-Ćurčin; Andrija Rašeta; Mirjana Malešev; Danijel Kukaras; Vlastimir Radonjanin; Miloš Šešlija; Drago Žarković. 2020. "Experimental Testing of Reinforced Concrete Deep Beams Designed by Strut-and-Tie Method." , no. : 1.

Journal article
Published: 06 March 2019 in Materials
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This paper presents results regarding the phase composition, microstructure and textural properties of two types of aggregates, which were prepared via crushing or pelletization of alkali-activated Class F fly ash and cured under different conditions. The alkali activator was the same for aggregate products, containing an alkaline solution consisting of 8 M NaOH and Na-silicate (8 M NaOH/Na-silicate = 1:2.5 mass ratio). The aforementioned properties were influenced by two different preparation procedures combined with varying curing regimes (under normal conditions at 20 °C, RH 40⁻60% for 28 and 120 days and under an accelerated regime, at 65 °C for 5 days). Aggregates were characterized using X-ray diffraction (XRD), Fourier-transform transmission infrared spectroscopy (FTIR), back scattered electron microscopy with energy dispersive spectrometer (BSE-EDS) analyses and mercury intrusion porosimetry (MIP). The results showed noteworthy structural and textural diversities between the two types of aggregate. The method of preparation and curing regime affected the formation of the N-A-S-H structure and the texture of the alkali-activated fly ash product, with the crushing method giving an advantage.

ACS Style

Ognjen Rudić; Vilma Ducman; Mirjana Malešev; Vlastimir Radonjanin; Suzana Draganić; Slobodan Šupić; Miroslava Radeka. Aggregates Obtained by Alkali Activation of Fly Ash: The Effect of Granulation, Pelletization Methods and Curing Regimes. Materials 2019, 12, 776 .

AMA Style

Ognjen Rudić, Vilma Ducman, Mirjana Malešev, Vlastimir Radonjanin, Suzana Draganić, Slobodan Šupić, Miroslava Radeka. Aggregates Obtained by Alkali Activation of Fly Ash: The Effect of Granulation, Pelletization Methods and Curing Regimes. Materials. 2019; 12 (5):776.

Chicago/Turabian Style

Ognjen Rudić; Vilma Ducman; Mirjana Malešev; Vlastimir Radonjanin; Suzana Draganić; Slobodan Šupić; Miroslava Radeka. 2019. "Aggregates Obtained by Alkali Activation of Fly Ash: The Effect of Granulation, Pelletization Methods and Curing Regimes." Materials 12, no. 5: 776.

Journal article
Published: 06 September 2013 in Arabian Journal for Science and Engineering
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This paper presents the results of experimental research on the effect of the lightweight aggregate, type and amount of cement on the values of the modulus of elasticity of lightweight aggregate concrete. Six different concrete mixtures were made to test if it is possible to replace recommended Portland cement with Portland composite cement, or to reduce the amount of cement and to obtain a satisfactory performance of the lightweight aggregate concrete. Values of the static and dynamic modulus of elasticity determined experimentally were analysed and then compared with the values obtained by FIP recommendation. In addition, for the five types of concrete, stress–strain (σ–ε) curves were determined and analysed. It was concluded that there is a very good correlation between static and dynamic modulus of elasticity and very good match between the experimental and empirical results. The analysis of the values of σ–ε curves led to the conclusion that type of cement does not significantly affect analysed properties, while the effect of the amount of cement cannot be neglected.

ACS Style

Mirjana Malešev; Vlastimir Radonjanin; Ivan Lukić; Vesna Bulatović. The Effect of Aggregate, Type and Quantity of Cement on Modulus of Elasticity of Lightweight Aggregate Concrete. Arabian Journal for Science and Engineering 2013, 39, 705 -711.

AMA Style

Mirjana Malešev, Vlastimir Radonjanin, Ivan Lukić, Vesna Bulatović. The Effect of Aggregate, Type and Quantity of Cement on Modulus of Elasticity of Lightweight Aggregate Concrete. Arabian Journal for Science and Engineering. 2013; 39 (2):705-711.

Chicago/Turabian Style

Mirjana Malešev; Vlastimir Radonjanin; Ivan Lukić; Vesna Bulatović. 2013. "The Effect of Aggregate, Type and Quantity of Cement on Modulus of Elasticity of Lightweight Aggregate Concrete." Arabian Journal for Science and Engineering 39, no. 2: 705-711.

Journal article
Published: 30 April 2010 in Sustainability
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A comparative analysis of the experimental results of the properties of fresh and hardened concrete with different replacement ratios of natural with recycled coarse aggregate is presented in the paper. Recycled aggregate was made by crushing the waste concrete of laboratory test cubes and precast concrete columns. Three types of concrete mixtures were tested: concrete made entirely with natural aggregate (NAC) as a control concrete and two types of concrete made with natural fine and recycled coarse aggregate (50% and 100% replacement of coarse recycled aggregate). Ninety-nine specimens were made for the testing of the basic properties of hardened concrete. Load testing of reinforced concrete beams made of the investigated concrete types is also presented in the paper. Regardless of the replacement ratio, recycled aggregate concrete (RAC) had a satisfactory performance, which did not differ significantly from the performance of control concrete in this experimental research. However, for this to be fulfilled, it is necessary to use quality recycled concrete coarse aggregate and to follow the specific rules for design and production of this new concrete type.

ACS Style

Mirjana Malešev; Vlastimir Radonjanin; Snežana Marinković. Recycled Concrete as Aggregate for Structural Concrete Production. Sustainability 2010, 2, 1204 -1225.

AMA Style

Mirjana Malešev, Vlastimir Radonjanin, Snežana Marinković. Recycled Concrete as Aggregate for Structural Concrete Production. Sustainability. 2010; 2 (5):1204-1225.

Chicago/Turabian Style

Mirjana Malešev; Vlastimir Radonjanin; Snežana Marinković. 2010. "Recycled Concrete as Aggregate for Structural Concrete Production." Sustainability 2, no. 5: 1204-1225.

Journal article
Published: 28 April 2010 in Sensors
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This paper describes an innovative design of a wireless, passive LC sensor and its application for monitoring of water content in building materials. The sensor was embedded in test material samples so that the internal water content of the samples could be measured with an antenna by tracking the changes in the sensor’s resonant frequency. Since the dielectric constant of water was much higher compared with that of the test samples, the presence of water in the samples increased the capacitance of the LC circuit, thus decreasing the sensor’s resonant frequency. The sensor is made up of a printed circuit board in one metal layer and water content has been determined for clay brick and autoclaved aerated concrete block, both widely used construction materials. Measurements were conducted at room temperature using a HP-4194A Impedance/Gain-Phase Analyzer instrument.

ACS Style

Goran Stojanović; Milan Radovanovic; Mirjana Malešev; Vlastimir Radonjanin. Monitoring of Water Content in Building Materials Using a Wireless Passive Sensor. Sensors 2010, 10, 4270 -4280.

AMA Style

Goran Stojanović, Milan Radovanovic, Mirjana Malešev, Vlastimir Radonjanin. Monitoring of Water Content in Building Materials Using a Wireless Passive Sensor. Sensors. 2010; 10 (5):4270-4280.

Chicago/Turabian Style

Goran Stojanović; Milan Radovanovic; Mirjana Malešev; Vlastimir Radonjanin. 2010. "Monitoring of Water Content in Building Materials Using a Wireless Passive Sensor." Sensors 10, no. 5: 4270-4280.