Nikola Tosic

Nikola Tosic
Universitat Politècnica de Catalunya | UPC · Department of Civil and Environmental Engineering

PhD Civil Engineering

About

49
Publications
22,850
Reads
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626
Citations
Introduction
Postdoctoral fellow and former Marie Skłodowska-Curie Individual Fellow at the Polytechnic University of Catalonia. Formerly Fulbright Visiting Scholar at the University of Notre Dame and assistant professor at the Faculty of Civil Engineering, University of Belgrade. Investigating enviromentally sustainable alternatives to traditional structural concretes, from reinforced and fibre reinforced concretes to functionally graded composites.
Additional affiliations
February 2020 - present
Universitat Politècnica de Catalunya
Position
  • Fellow
Description
  • Working on the research project "Fibre Reinforced Concrete with Recycled and Waste Materials Optimised for Improved Sustainability of Urban Projects"
April 2019 - November 2019
University of Notre Dame
Position
  • Fulbright Visiting Scholar
Description
  • Fulbright Visiting Scholar working on the project "Optimization of Stratified Recycled Concrete Structures Based on Numerical Analyses and Life Cycle Assessment" with prof. Yahya Kurama
October 2018 - August 2019
University of Belgrade, Faculty of Civil Engineering
Position
  • Professor (Assistant)
Description
  • Assistant professor in the field of reinforced concrete structures
Education
October 2012 - March 2018
University of Belgrade, Faculty of Civil Engineering
Field of study
  • Civil engineering

Publications

Publications (49)
Article
Partially replacing ordinary Portland cement (OPC) with low-carbon supplementary cementitious materials (SCMs) in blended cement concrete (BCC) is perceived as the most promising route for sustainable concrete production. Despite having a lower environmental impact, BCC could exhibit performance inferior to OPC in design-governing functional proper...
Article
Full-text available
Following the trend of updating methods that establish the minimum slenderness of concrete members based on the work of Rangan and Scanlon, this paper elaborates new formulations of the effective moment of inertia factor (alpha), which espresses the ratio of the equivalent moment moment of inertia to the gross moment of inertia. For this purpose, c...
Article
Herein, an investigation of multi-generational recyclability of polypropylene fibre reinforced concrete (PPFRC) was performed. The parent concretes were produced with 0 and 6 kg/m³ of polypropylene fibres. After recycling, the obtained coarse recycled concrete aggregates (RCAs) were used in new concrete with 0 and 6 kg/m³ of polypropylene fibres, r...
Article
Producing limestone powder requires comparably far less energy than the production of ordinary Portland cement (OPC), making it a promising sustainable solution for partial replacement of OPC in concrete. Lower production energy could be translated into lower environmental impact and lower cost, which are two pillars of the sustainability of the re...
Article
Full-text available
Lightweight aggregate concrete (LWC) and fiber reinforced polymer (FRP) reinforcement are potentially more sustainable alternatives to traditional steel-reinforced concrete structures, offering several important benefits. To further the knowledge in this area, the physical-mechanical properties of LWC produced with 0%, 50%, and 100% expanded clay a...
Article
Hybrid reinforced technology (combination of steel reinforcing bars and fibers) can be considered as a competitive alternative to the already existing solutions for the construction of column-supported flat slabs. Constructed hybrid-reinforced buildings prove that hybrid solutions have sufficient bearing capacity to maintain structural integrity de...
Article
Fiber-reinforced concrete (FRC) is an attractive alternative to traditional steel bar-reinforced concrete structures, as evidenced by the constantly increasing market consumption of structural fibers for this purpose. In spite of significant research dedicated to FRC, less attention has been given to the effects of low temperatures on the mechanica...
Article
Fibre reinforced concrete (FRC) is increasingly being used in elements with high structural responsibility, the constructed FRC column-supported flat slabs (CSFSs, hereinafter) with partial or even total substitution of reinforcing steel bars being a supporting evidence for that statement. These pioneer experiences provide encouraging results with...
Chapter
Fibre reinforced concrete (FRC) has quickly become an attractive solution for increasing both the mechanical performance and sustainability of concrete structures. In particular, polymeric fibres are increasingly recognized as offering significant benefits for FRC structural applications, especially in areas such as durability. Nonetheless, the beh...
Chapter
The scope and amount of fibre reinforced concrete (FRC) structural applications have seen significant increases. This means that safe and reliable ultimate limit state (ULS) models are necessary for FRC structural members. Among these, shear strength of FRC members without shear reinforcement is highly important due to the brittleness of shear fail...
Article
Full-text available
Fiber-reinforced concrete (FRC) has been proved to be a competitive solution for structural purposes. Extensive research has highlighted the benefits of adding fibers on the post-cracking strength, reduced crack spacing and crack width, and improved durability, among others. However, these aspects are related to serviceability limit states, and sig...
Article
Full-text available
Fibre reinforced concrete (FRC) is increasingly used for structural purposes owing to its many benefits, especially in terms of improved overall sustainability of FRC structures relative to traditional reinforced concrete (RC). Such increased structural use of FRC requires safe and reliable models for its design in ultimate limit states (ULS). Part...
Article
Full-text available
With increasing construction activity and concrete consumption globally, the economic, environmental, and social impacts of human activities continue to increase rapidly. Therefore, it is imperative to assess the choice and construction of each structure and structural component from a sustainability-based perspective. In this study, such a multi-c...
Article
Deflections are among the most complex aspects of reinforced concrete behavior. Furthermore, deflection control is increasingly a governing criterion in design, especially in the case of two-way members such as flat slabs or edge-supported slabs. However, simple and theoretically sound and adequately verified methods for calculating deflections of...
Article
Full-text available
A significant amount of research has been performed on recycled aggregate concrete (RAC), both on the material and structural level. This has enabled the formulation of material and structural resistance models that can be safely and reliably used for the structural design of RAC members and the new Eurocode 2 (EC2) will contain an informative anne...
Article
Full-text available
Recycled aggregate concrete (RAC), i.e., concrete produced with recycled concrete aggregate (RCA) has been heavily investigated recently, and the structural design of RAC is entering into design codes. Nonetheless, the service load deflection behavior of RAC remains a challenge due to its larger shrinkage and creep, and lower modulus of elasticity....
Article
The use of recycled aggregate (RA) to produce recycled aggregate concrete (RAC) is a proven way of decreasing the consumption of natural aggregate (NA) and the landfilling of construction and demolition waste. However, adoption of codes for the design of RAC and RAC structures has been lacking. Within the framework of the new fib Model Code 2020 an...
Presentation
Full-text available
Recycled aggregate concrete (RAC) is one of the most promising and most investigated alternatives to traditional natural aggregate concrete (NAC). The behaviour of reinforced RAC members and structures has been extensively investigated experimentally and their ultimate limit state behaviour has been found to be equivalent to that of NAC structures....
Article
Full-text available
Fiber-reinforced concrete (FRC) is increasingly used in structural applications owing to its benefits in terms of toughness, durability, ductility, construction cost and time. However, research on the creep behavior of FRC has not kept pace with other areas such as short-term properties. Therefore, this study aims to present a comprehensive and cri...
Article
Recycled aggregate concrete (RAC) is entering into structural design codes such as the new Eurocode 2. However, serviceability limit state (SLS) behavior of RAC, especially deflections, can be significantly greater than for natural aggregate concrete. Proposals for deflection control of RAC exist, but there still have not been significant studies o...
Conference Paper
Concrete as a construction material was used mostly as a symbol of modernity and economic power, artistic and cultural development of a new political system within the European countries of the Communist Bloc. It was taken as a representation of the material of the proletariat: cheap, lacking in ornament, industrial, in counterpoint with the predom...
Article
Recycled aggregate concrete (RAC) has emerged as a viable solution for solving some of the environmental problems of concrete production. However, design guidelines for deflection control of reinforced RAC members have not yet been proposed. This study presents a comprehensive analysis of the applicability of the fib Model Code 2010 (MC2010) deflec...
Conference Paper
Recycled aggregate concrete (RAC) produced with recycled concrete aggregate (RCA) is one of the most promising ways of eliminating concrete waste and saving natural resources. However, shrinkage and creep behaviour of RAC, important for serviceability design of reinforced and prestressed concrete structures, are still insufficiently studied and gui...
Article
Full-text available
In order to preserve natural resources, the use of waste and alternative materials in the construction and maintenance of roads is increasingly investigated. is paper presents the results of testing wearing course asphalt mixtures (AC 11s SURF 50/70) made with various percentages of fly ash, used as a partial or complete substitute for mineral fill...
Article
Full-text available
Recycled aggregate concrete (RAC) is a promising solution to addressing the sustainability issues raised by concrete production. However, its long-term properties are not fully characterised, especially creep behaviour, which is significant for the design of RAC structures. This study presents the results of a meta-analysis of previously published...
Conference Paper
This paper presents experimental results of long-term behavior of reinforced beams made from natural aggregate concrete (NAC), recycled aggregate concrete (RAC), and high-volume fly ash concrete (HVFAC) under sustained load. Two 3.2 m span simply supported beams were cast from each concrete type and loaded after 7 and 28 days for a period of 450 da...
Article
This paper describes a meta-analysis of previously published studies on the shrinkage strain of recycled aggregate concrete (RAC). The study aims at providing an analytic expression for the shrinkage strain of RAC to be used in conjunction with the existing fib Model Code 2010 shrinkage prediction model. For this purpose, a database of experimental...
Conference Paper
The use of fibres in structural elements is the principle which exists for a long time. Since, in the beginning, people were using only experience and trial and error, regulations regarding these types of elements did not exist. Accordingly, fibre reinforced concrete (FRC) is a relatively novel constructive material and its behaviour is the subject...
Conference Paper
The environmental problems posed by the production of concrete can be solved namely by using green concrete produced with recycled and waste materials. This study intends to present results on the long-term properties of concrete produced with 100% coarse recycled concrete aggregate and concrete produced with 50% of class F fly ash in total cementi...
Conference Paper
Reliably calculating the deflections is one of the more difficult aspects of the design of reinforced concrete members. All calculation models require a large number of experimental results for their calibration. Such results are lacking for beams made of green concretes with recycled and waste materials. This paper presents the results of applying...
Article
Six simply supported reinforced concrete beams were tested under sustained loads for 450 days. The beams were made from natural aggregate concrete (NAC), recycled aggregate concrete (RAC) and high-volume fly ash concrete (HVFAC); two beams were made from each concrete and loaded after 7 and 28 days. On the beams, deflections, cracking and strains w...
Chapter
The behavior of reinforced concrete under long-term loading is an important topic when designing concrete structures. Creep and shrinkage of concrete and long-term deflections of concrete structures, mainly reinforced concrete beams, have been studied for many decades but because of the long-term nature of these tests, existing experiments are rela...
Article
An experimental study of the shear behaviour of recycled aggregate concrete (RAC) beams with and without shear reinforcement is presented. Nine full-scale simply supported beams were loaded in four-point bending tests until failure. Three different replacement ratios of coarse natural with coarse recycled concrete aggregate (0%, 50% and 100%), and...
Article
This paper presents a comparative environmental assessment of several different green concrete mixes for structural use. Four green concrete mixes were compared with a conventional concrete mix: recycled aggregate concrete with a cement binder, high-volume fly ash concrete with natural and recycled aggregates, and alkali activated fly ash concrete...
Article
Full-text available
Achieving sustainability of all human actions has been recognized as an urgent and top priority since the warnings of anthropogenic climate change are overwhelming. However, the precise goal, aim and method of shifting the global paradigm towards sustainability are still contested. Among all human activities, the concrete industry has one of the la...
Article
A comprehensive database of recycled aggregate concrete and companion natural aggregate concrete beams’ flexural and shear strength was compiled from 217 experimental results. Strict criteria were applied to determine the failure type. Sub-databases were formed with beams failing in flexure and shear with and without stirrups. On each sub-database...
Conference Paper
Full-text available
Recycled concrete aggregates have a significantly higher water absorption compared to natural aggregates due to the presence of the residual cement paste after concrete waste crushing. This high water absorption determines the mixture proportioning for recycled aggregate concrete. In this study a method for the continuous measurement of the kinetic...
Research
Full-text available
A brief overview of the activities of the research team of which I am a part.
Conference Paper
Full-text available
This paper presents a part of the results obtained within the frame of the SCOPES joint research project – a scientific collaboration between ETH Zürich and Faculty of Civil Engineering, University of Belgrade. One of the goals of the project was to produce recycled aggregate concrete with fly ash as partial cement replacement, which would have mec...
Conference Paper
Full-text available
The construction industry is increasingly unsustainable, being responsible for a large proportion of the world material and energy consumption. Within it, concrete is the most widely used material and it has a significant environmental footprint with CO2 emissions from cement production being responsible for 4.4% of annual global industry emissions...
Article
Full-text available
A two-phase experimental study on the effect of simultaneous partial replacement of cement and fine aggregate with fly ash on the mechanical and time-dependent properties of high-volume fly ash concrete (HVFAC) is presented. The results of the first phase of the study show that it is possible to make structural grade HVFAC with 50% of cement and an...
Article
Recycling of concrete waste to produce recycled concrete aggregates (RCA) and its use in the production of structural concrete is the way towards reducing the depletion of natural mineral resources and the amount of construction and demolition waste being land-filled. The goal of this study was to determine the optimal choice of aggregate type and...
Article
Full-text available
The Serbian design code for reinforced concrete structures is somewhat out-of-date in its approach to structural design. In this paper, a study into the possible transition to a semi-probabilistic approach is presented. Firstly, the implicit reliability indices in the current Serbian reinforced concrete design code are determined for three design s...
Conference Paper
Full-text available
Alkali activated fly ash concrete (AAFAC) prepared with a class F fly ash from power plant " Nikola Tesla B " and a mixed alkali activator of sodium silicate and sodium hydroxide solutions was investigated. Firstly, eight alkali activated fly ash pastes (AAFAP) with different activator concentration were tested in order to investigate the effect of...
Conference Paper
Full-text available
The seismic isolation is, in addition to the system of additional dampers, the most common method of structural control of building response subjected to earthquake excitations, especially in the zones of high seismicity. The paper presents the method for reduction of structural response using lead rubber bearings. In an illustrative example of a s...
Article
Full-text available
This study presents the research carried out in finding an optimal finite element (FE) model for calculating the long-term behavior of reinforced concrete (RC) beams. A multipurpose finite element software DIANA was used. A benchmark test in the form of a simply supported beam loaded in four-point bending was selected for model calibration. The res...
Conference Paper
Full-text available
Sustainability is important to the well-being of our planet, continued growth of a society and human development. Concrete is the most widely used construction material in the world. For a variety of reasons, the concrete construction industry is not sustainable: it consumes huge quantities of virgin materials, the production of Portland cement is...

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Projects

Projects (3)
Project
Use of primary raw materials (minerals, fossil fuels and metals) needs to be reduced by 50% in 2030, and by 100% in 2050 in order to reach carbon neutrality. Recycling of materials has to be maximized. The amount of concrete construction and demolition waste is increasing immensely and it is the largest among other materials (steel, wood, plastic). End-of-life concrete products are currently recycled without any preselection. Only 5% of recycled concrete (and thus 95% virgin material) is used for making new concrete structures, due to unknown origin and quality of the recycled parent concrete. If we could characterise concrete before demolition, its reuse could be greatly increased. We need experimental approaches and techniques that can determine chemical and mechanical properties of concrete structures before demolition. A major bottle-neck is the difficulty to measure concrete chemical composition in-situ. This project will develop a unique characterization approach, which combines chemical and ultrasonic testing, to characterize and separate “healthy” from “deteriorated” concrete. This approach will provide for the first time a comprehensive framework for selective demolition of concrete structures. The general nature of the fundamental questions in this study makes the project relevant and applicable for any concrete mix design. Ultimately, the sorted concrete rubble will enable recyclers to improve the quality of their products, and concrete producers to use recycled concrete aggregates of known quality in new concrete structures.
Project
This is a MSCA-IF project investigating the use of recycled and waste materials in fibre reinforced concrete. The research will be focused on developing and optimising structural-grade “green” FRC (G-FRC) with different recycled and waste materials for maximising sustainability; developing novel G-FRC characterisation tests with reduced result scatter; formulating performance-based indicators for recycled and waste materials used in G-FRC to facilitate quality control; and developing design guidelines for G-FRC structures with full-scale structural test verification and in-situ application. https://cordis.europa.eu/project/id/836270
Project
Experimental programme within the scope of my PhD thesis in which I am comparing the long-term behaviour of natural aggregate concrete, recycled aggrgeate concrete and high-volume fly ahs concrete beams.