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Krstic, Marija (author), Davalos, Julio F. (author), Rossi, Emanuele (author), Figueiredo, Stefan C. (author), Copuroglu, Oguzhan (author)Over the last few years, the United States has experienced a shortage of fly ash and slag that consequently created a need for an alternative material that is locally available, sustainable, and provides desirable concrete properties. Recent studies have shown that Ground Glass Pozzolan (GGP) offers favorable attributes as a supplementary...conference paper 2021
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Krstic, Marija (author), Davalos, Julio F. (author), Rossi, E. (author), Chaves Figueiredo, S. (author), Copuroglu, Oguzhan (author)Over the last few years, the United States has experienced a shortage of fly ash and slag that consequently created a need for an alternative material that is locally available, sustainable, and provides desirable concrete properties. Recent studies have shown that Ground Glass Pozzolan (GGP) offers favorable attributes as a supplementary...conference paper 2021
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Rossi, E. (author), Zhang, Hongzhi (author), Nijland, Timo G. (author), Copuroglu, Oguzhan (author), Polder, R.B. (author), Šavija, B. (author)An important input parameter for numerical models that simulate cracking of the concrete cover due to reinforcement corrosion is the Elastic modulus of corrosion product (Ecp). Despite its relevance, Ecp is subject of significant variations according to the values reported in the literature, which vary from less than 100 MPa up to 360 GPa....conference paper 2021
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França de Mendonça Filho, F. (author), Copuroglu, Oguzhan (author)Calcium aluminate cements (CAC) are widely used for the production of refractory concretes that are able to withstand extreme temperatures. During exposure to such temperatures, the main hydration phases revert to mayenite, calcium aluminate and calcium dialuminate. Many investigations focused on the description of this mechanism and how it...conference paper 2019
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Chen, Y. (author), Yalçinkaya, Ç. (author), Copuroglu, Oguzhan (author), Schlangen, E. (author)Recently, our group attempted to develop the ternary blended (Portland cement, calcined clay and limestone) cementitious material for 3D concrete printing (3DCP). Due to the elimination of formwork during the layer-by-layer casting process, the printed material should have favorable elastic properties and green strength at the fresh state. A...conference paper 2019
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Holthuizen, Patrick (author), Copuroglu, Oguzhan (author), Polder, R.B. (author)In the Netherlands civil engineering structures, such as overpasses, bridges and tunnels are generally built using blast furnace slag cement (BFSC, CEM III/B) concrete, because of its high resistance against chloride penetration. Although the Dutch experience regarding durability performance of BFSC concrete has been remarkably good, its...conference paper 2018
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Troian, S (author), Grunewald, S. (author), Schlangen, E. (author), Copuroglu, Oguzhan (author)The production of double-curved precast concrete elements for cladding or shell structures requires expensive CNC (computer numerical control)-milled formwork. As an alternative method, the innovative flexible mould for economically efficient and sustainable production of such elements is discussed in this paper. This method comprises the use of...conference paper 2018
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Chen, Y. (author), Veer, F.A. (author), Copuroglu, Oguzhan (author), Schlangen, E. (author)In conventional concrete, replacing high-volume (more than 45%) of ordinary Portland cement (OPC) by supplementary cementitious materials (SCMs) is not a novel CO2 reduction method, whereas rarely in 3D printable concrete. This study attempts to explore the feasibility of using SCMs in 3D printable concrete. Initially, the existing binder mixes,...conference paper 2018
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Justino de Lima, C.L. (author), Veer, F.A. (author), Copuroglu, Oguzhan (author), Nijsse, R. (author)The growth of the industrial production generates a high volume of waste materials. These products have a significant impact on the environment. Therefore, the valorization of industrial wastes, especially those produced in huge quantities, is an important social and ecological issue. Waste reuse and recycling could help to develop new...conference paper 2018
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Chaves Figueiredo, S. (author), Copuroglu, Oguzhan (author), Šavija, B. (author), Schlangen, E. (author)The use of fibres to enhance the ductility of cementitious composites has been extensively studied for the past few years. The addition of polymeric or metalic fibres with random orientation to the composite or even natural long and aligned fibres demonstrated a very successful reinforcement capable to reach a high mechanical performance....conference paper 2018
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Schipper, H.R. (author), Grunewald, S. (author), Troian, S. (author), Raghunath, P. (author), Schlangen, E. (author), Copuroglu, Oguzhan (author)Expensive CNC (computer numerical controlled)-milled formwork is required for the production of double-curved precast concrete elements for cladding or shell structures. The innovative flexible mould method for economically efficient and sustainable production of such elements, developed at Delft University of Technology, comprises the use of a...conference paper 2017
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Ma, X. (author), Copuroglu, Oguzhan (author), Schlangen, E. (author), Han, N (author), Xing, F (author)External sulfate attack is one of the situations that may cause gradual but severe damage in cementitious materials, which may lead to cracking, increased permeability and strength loss. In this paper, thin-walled hollow cement paste cylinders with a wall thickness of 2.5mm were made considering the slow penetration process of sulfate ions under...conference paper 2016
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Mendonca Filho, F.F. (author), Pacheo, J. (author), Copuroglu, O. (author)Energy dispersive X-ray spectrometry (EDS) is a powerful tool for research studies on building materials. Elemental quantification in cementitious phases contained in the concrete microstructure can be performed at an excellent spatial resolution. However, accurate compositional quantification requires a standard-based analysis, whereas...conference paper 2015
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Kempl, J. (author), Copuroglu, O. (author)Blast Furnace Slag (BFS) is a waste product of industrial steel production and a common additive in the cement industry in Northern European countries. However, cementitious materials made from slag-rich cement, particularly CEM III /B, are very susceptible to carbonation. Recent investigations have shown that the surface application of aqueous...conference paper 2015
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Lukovic, M. (author), Schlangen, E. (author), Savija, B. (author), Ye, G. (author), Copuroglu, O. (author)Simulation of mechanical behaviour of heterogeneous materials is only possible if the local properties of the components are known. In recent years nano-indentation is being applied on different levels to obtain local mechanical properties. The aim of this paper is to explore various ways to obtain these properties by combining nano-indentation...conference paper 2015
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Van der Velde, O. (author), Copuroglu, O. (author), Veer, F.A. (author)This paper shows the benefit of using transmitted light microscopy together with a Z-scanning software in fractographical analyses of glass. The strength of glass is largely dependent on processes that happen at the microscale. In this research, 52 plates were fractured in a biaxial tensile test. These were divided into five categories according...conference paper 2015
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Silva De Souza, L.M. (author), Polder, R.B. (author), Copuroglu, O. (author)Alkali-silica reaction (ASR) is one of the major deterioration mechanisms that affect numerous concrete structures worldwide. During the reaction, hydroxyl and alkali (sodium and potassium ) ions react with certain siliceous compounds in the aggregate, forming a hygroscopic gel. The gel absorbs water from the cement paste and swells, possibly...conference paper 2014
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Pargar, F. (author), Koleva, D.A. (author), Copuroglu, O. (author), Koenders, E.A.B. (author), van Breugel, K. (author)The level of free chloride concentration in reinforced concrete structures essentially determines the onset of steel corrosion initiation and further propagation. One of the well-known methods for monitoring free chloride concentration is using silver/silver chloride electrodes (Ag/AgCl). These electrodes are sensitive mainly to chloride ions...conference paper 2014
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Pargar, F. (author), Koleva, D.A. (author), Copuroglu, Oguzhan (author), Koenders, E.A.B. (author), van Breugel, K. (author)The stability of chloride ion selective electrodes in highly alkaline solutions is an important aspect when reliability and feasibility within reinforced concrete applications are concerned. The sensitivity of these electrodes largely depends on the properties of the AgCl layer, including uniformity, porosity, orientation, thickness, etc. These...conference paper 2014
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Zemskov, S.V. (author), Copuroglu, O. (author), Vermolen, F.J. (author)A mathematical model for the post-damage recovery of carbonated cement is described. The model is based on a two-dimensional initial-boundary value problem for a system of partial differential equations. The study is embedded within the framework of investigating the effect of using lightweight expanded clay aggregate, which is incorporated into...conference paper 2013
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