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Pre-demolition concrete waste stream identification: classification framework

Nedeljković, Marija (author), Tošić, Nikola (author), Schlangen, E. (author), Fennis, Sonja (author)

Demand for high quality recycled concrete aggregates (RCA) to offset the use of primary materials is significantly rising due to circular economy goals and high-value reuse of concrete. The quality of RCA significantly affects their availability for new concrete production due to the variability of parent concrete streams. The optimization of...

journal article 2023

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Non-destructive screening methodology based on handheld XRF for the classification of concrete: cement type-driven separation

Nedeljković, Marija (author), Tošić, Nikola (author), Holthuizen, Patrick (author), França de Mendonça Filho, F. (author), Copuroglu, Oguzhan (author), Schlangen, E. (author), Fennis, Sonja (author)

The utilization of locally available concrete waste for producing recycled concrete aggregates is recognized as one of the most sustainable ways of satisfying the growing demand for concrete production. However, the quality of concrete waste depends on its origin and it may significantly differ from one concrete structure to another. Knowing the...

journal article 2023

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Energy consumption of a laboratory jaw crusher during normal and high strength concrete recycling

Nedeljković, Marija (author), Kamat, Ameya (author), Holthuizen, Patrick (author), Tošić, Nikola (author), Schlangen, E. (author), Fennis, Sonja (author)

This paper presents the measurement and analysis of energy consumption of a laboratory jaw crusher during concrete recycling. A method was developed to estimate the power requirements of a lab-scale jaw crusher. The impact of material properties on the crusher performance is studied. Eight concrete strength classes (C20/25–C80/95) were...

journal article 2023

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Carbonation Rate of Alkali-Activated Concretes: Effects of Compositional Parameters and Carbonation Conditions

Gluth, Gregor J.G. (author), Ke, Xinyuan (author), Vollpracht, Anya (author), Weiler, Lia (author), Bernal, Susan A. (author), Cyr, Martin (author), Dombrowski-Daube, Katja (author), Geddes, Dan (author), Nedeljković, Marija (author)

The current ability to predict the carbonation resistance of alkali-activated materials (AAMs) is incomplete, partly because of widely varying AAM chemistries and variable testing conditions. To identify general correlations between mix design parameters and the carbonation rate of AAMs, RILEM TC 281-CCC Working Group 6 compiled and analysed...

book chapter 2023

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RILEM TC 281-CCC Working Group 6: Carbonation of Alkali Activated Concrete: Preliminary Results of a Literature Survey and Data Analysis

Gluth, Gregor J.G. (author), Ke, Xinyuan (author), Vollpracht, Anya (author), Bernal, Susan A. (author), Cizer, Özlem (author), Cyr, Martin (author), Dombrowski-Daube, Katja (author), Geddes, Dan (author), Nedeljković, Marija (author)

The current understanding of the carbonation of alkali-activated concretes is hampered inter alia by the wide range of binder chemistries used. To overcome some of the limitations of individual studies and to identify general correlations between their mix design parameters and carbonation resistance, the RILEM TC 281-CCC working group 6...

book chapter 2023

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Carbonation rate of alkali-activated concretes and high-volume SCM concretes: a literature data analysis by RILEM TC 281-CCC

Gluth, Gregor J.G. (author), Ke, Xinyuan (author), Vollpracht, Anya (author), Weiler, Lia (author), Bernal, Susan A. (author), Dombrowski-Daube, Katja (author), Geddes, Daniel A. (author), Grengg, Cyrill (author), Nedeljković, Marija (author)

The current understanding of the carbonation and the prediction of the carbonation rate of alkali-activated concretes is complicated inter alia by the wide range of binder chemistries used and testing conditions adopted. To overcome some of the limitations of individual studies and to identify general correlations between mix design...

journal article 2022

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Multi-level chemical characterization of dutch fine recycled concrete aggregates: a comparative study

Nedeljković, Marija (author), Visser, Jeanette (author), Nijland, Timo G. (author), Valcke, Siska (author), Schlangen, Erik (author)

In the Netherlands, beside cement replacement with more green cement types, there is also an urgent need for alternative materials for natural sand in new concrete in order to make it circular. Furthermore, the recyclers have raised questions regarding upscaling and the potential of fine recycled concrete aggregates (fRCA) in structural concrete...

conference paper 2021

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Carbonation rates of alkali-activated and cement based concretes

Nedeljković, Marija (author), Arbi, Kamel (author), Ye, Guang (author)

The reduction of pH from ~12.5 to ~9 by carbonation of the pore solution of reinforced cementbased concrete structures results in the reinforcement corrosion. The rate of carbonation is an important input for design of the concrete cover depth and the service life prediction of reinforced concrete structures because the initiation of...

conference paper 2021

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Selectief slopen van betonconstructies: Ontwikkeling in-situbetonidentificatietechniek

Nedeljković, Marija (author), Schlangen, E. (author), Fennis, Sonja (author)

Momenteel wordt gerecycled beton meestal toegepast als wegfundering en daarmee 'gedowncycled'. Dat komt onder meer doordat er geen informatie beschikbaar is over de kwaliteit van het gesloopte beton. Hoogwaardig hergebruik van gerecyclede toeslagmaterialen in nieuwe betonconstructies vereist een strengere kwaliteitscontrole. Aan de TU Delft...

journal article 2021

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Multi-level chemical characterization of dutch fine recycled concrete aggregates: a comparative study

Nedeljković, Marija (author), Visser, Jeanette (author), Nijland, Timo G. (author), Valcke, Siska (author), Schlangen, E. (author)

In the Netherlands, beside cement replacement with more green cement types, there is also an urgent need for alternative materials for natural sand in new concrete in order to make it circular. Furthermore, the recyclers have raised questions regarding upscaling and the potential of fine recycled concrete aggregates (fRCA) in structural concrete...

conference paper 2021

document

Carbonation rates of alkali-activated and cement based concretes

Nedeljković, Marija (author), Arbi, Kamel (author), Ye, G. (author)

The reduction of pH from ~12.5 to ~9 by carbonation of the pore solution of reinforced cementbased concrete structures results in the reinforcement corrosion. The rate of carbonation is an important input for design of the concrete cover depth and the service life prediction of reinforced concrete structures because the initiation of...

conference paper 2021

document

Physical, chemical and mineralogical characterization of Dutch fine recycled concrete aggregates: A comparative study

Nedeljković, Marija (author), Visser, Jeanette (author), Nijland, Timo G. (author), Valcke, Siska (author), Schlangen, E. (author)

In circular concrete design, beside cement replacement with more environmentally friendly cement types, there is also an urgent need for sand replacement with fine recycled concrete aggregates (fRCA). The variations in physical and chemical properties of fRCA and lack of standards for their quality evaluation are the main reasons for not yet...

journal article 2021

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Influence of sand drying and mixing sequence on the performance of mortars with fine recycled concrete aggregates

Nedeljković, Marija (author), Mylonas, Akis (author), Wiktor, Virginie (author), Schlangen, E. (author), Visser, Jeanette (author)

Fine recycled concrete aggregates (fRCA, 0–4 mm) are produced from demolished concrete structures and consist of natural aggregates and old cement mortar. The presence of old cement mortar has detrimental effect on the fresh properties and strength of new concrete. This study aims to investigate the working mechanism and effectiveness of...

journal article 2021

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Use of fine recycled concrete aggregates in concrete: A critical review

Nedeljković, Marija (author), Visser, Jeanette (author), Šavija, B. (author), Valcke, Siska (author), Schlangen, E. (author)

This paper discusses the state-of-the-art of the fine recycled concrete aggregates (fRCA), focusing on their physical and chemical properties, engineering properties and durability of concretes with fRCA. Based on the systematic review of the published literature, it is impossible to deduce without any further research the guidelines and...

review 2021

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Role of curing conditions and precursor on the microstructure and phase chemistry of alkali-activated fly ash and slag pastes

Nedeljković, Marija (author), Ghiassi, Bahman (author), Ye, G. (author)

Understanding the role of curing conditions on the microstructure and phase chemistry of alkali-activated materials (AAMs) is essential for the evaluation of the long-term performance as well as the optimization of the processing methods for achieving more durable AAMs-based concretes. However, this information cannot be obtained with the...

journal article 2021

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Carbonation mechanism of alkali-activated fly ash and slag materials: In view of long-term performance predictions

Nedeljković, Marija (author)

As the building sector is expanding, a growing interest in technologies that can reduce the CO2 emission from concrete production has led to partial replacement of cement with by-products from various industrial processes. Besides the partial replacement of cement, development of alkali activation technology ensures full replacement of cement in...

doctoral thesis 2019

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Effect of curing conditions on the pore solution and carbonation resistance of alkali-activated fly ash and slag pastes

Nedeljković, Marija (author), Ghiassi, B. (author), van der Laan, Sieger (author), Li, Z. (author), Ye, G. (author)

The effect of curing conditions (sealed and unsealed) on the pore solution composition and carbonation resistance of different binary alkali-activated fly ash (FA) and ground granulated blast furnace slag (GBFS) pastes is investigated in this study. The studied mixtures were with FA/GBFS ratios of 100:0, 70:30; 50:50, 30:70, 0:100. Ordinary...

journal article 2019

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Geocon bridge geopolymer concrete mixture for structural applications

Ye, G. (author), Lukovic, M. (author), Ghiassi, B. (author), Aldin, Zainab (author), Prinsse, Silke (author), Liu, Jonh (author), Nedeljković, Marija (author), Hordijk, D.A. (author), Lagendijk, P. (author), Bosman, A. (author), Blom, T.A. (author), van Leeuwen, M. (author), Huang, Zhekang (author), Celada, Ulric (author), Du, C. (author), van den Berg, J.A.M. (author), Thijssen, A. (author), Wijte, Simon (author)

The sustainability of infrastructure projects is becoming increasingly important issue in engineering practice. This means that in the future the construction materials will be selected on the basis of the contribution they can make to reach sustainability requirements. Geopolymers are materials based on by-products from industries. By using...

journal article 2019

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Pore solution composition of alkali-activated slag/fly ash pastes

Zuo, Y. (author), Nedeljković, Marija (author), Ye, G. (author)

The pore solutions of a series of hardened alkali-activated slag/fly ash pastes were extracted by the steel-die method, and analyzed using ICP-OES analysis technique. According to the saturation index from thermodynamic calculations, the pore solutions of alkali-activated slag pastes kept oversaturated with respect to solid reaction products...

journal article 2019

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Mitigating the autogenous shrinkage of alkali-activated slag by metakaolin

Li, Z. (author), Nedeljković, Marija (author), Chen, B. (author), Ye, G. (author)

This study investigates the effectiveness of metakaolin (MK)in mitigating the autogenous shrinkage of alkali-activated slag (AAS). It is found that the autogenous shrinkage of AAS paste can be reduced by 40% and 50% when replacing 10% and 20% slag with MK, respectively. By providing additional Si and Al, and decreasing the pH of the pore...

journal article 2019