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Nie, Ding (author), Shang, Feng (author), Han, Xun (author)
Concrete dams are subjected to soft water penetration of a high water head during their long service lives. Degradation due to calcium leaching will decrease the durability of the concrete and affect dam safety. The long-term performance of concrete dams due to calcium leaching should be evaluated and predicted accurately to complete the...
conference paper 2021
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Andrade, C. (author), Coppens, E. (author)
In Belgium the construction of a repository for low and intermediate short living radioactive waste is in preparation. The safety is, among other aspects, based on engineered barriers of cementitious materials preventing release of radionuclides to the atmosphere or to the surrounding soil. Relatively low water infiltration through these...
conference paper 2021
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Leemann, Andreas (author), Lindgård, Jan (author)
ASR products formed in various aggregates of two different concrete mixtures tested both at 38 °C and 60 °C with the concrete prism test have been analysed by scanning electron microscope with energy dispersive X-ray spectroscopy. Additionally, Raman spectra of ASR products have been acquired. The variations in the chemical composition of ASR...
conference paper 2021
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Wang, Haochuan (author), Feng, Pan (author), Geng, Zifan (author), Liu, Qi (author)
The deterioration of organic coatings on concrete is closely linked to the efficiency in the protection process of reinforced structures. In the present work, polyurea resin and epoxy resin, which are widely used engineering coatings, were selected to measure and compare the performance under artificial aging. Fourier Transform infrared...
conference paper 2021
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Ebrahimi, Nafiseh (author), Ghaziaskar, Amin (author), Makar, Jon M. (author)
It is well known that iron sulphides such as pyrite (FeS2) and pyrrhotite ((Fe1-xS, 0-x-0.125) are unstable in presence of oxygen and moisture, oxidizing to produce sulfuric acid and iron sulphate. Further reactions in concrete cause the formation of expansive reaction products such as ettringite and thaumasite, potentially leading to structural...
conference paper 2021
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Kara De Maeijer, Patricija (author), Craeye, Bart (author), Kazemi-Kamyab, Hadi (author), Snellings, Ruben (author), Loots, Michel (author)
In the present study, a proprietary 0.2 tonne/h Dusty Cloud Separation (DCS) technology prototype by Value Ash Technologies NV (Belgium) was used to obtain ultra-fine fly ash as a novel by-product. Two types of Class F fly ash were used: separated fly ash (FA1) with particle size < 9.3 μm and ultra-fine fly ash (FA2) < 4.6 μm as sub-fraction of...
conference paper 2021
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OUYANG, Boya (author), LI, Yuhai (author), SONG, Yu (author), WU, Feishu (author), YU, Huizi (author), WANG, Yongzhe (author), BAUCHY, Mathieu (author), SANT, Gaurav (author)
Despite previous efforts to relate concrete proportioning and strength, a robust knowledgebased model for accurate concrete strength predictions is still lacking. As an alternative to physical or chemical-based models, machine learning (ML) methods offer a new solution to this problem. Although ML can handle the complex, non-linear, non-additive...
conference paper 2021
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Paglia, C. (author), Antonietti, S. (author)
In reinforced concrete structures carbonation and chloride ingress are two main phenomena that induce rebar corrosion. Agents such as CO2 gas or water containing chloride enter the cementitious material mainly throughout the pore system. The air permeability was measured with a non-destructive rapid test method. The aim of the present work was...
conference paper 2021
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Vrijders, Jeroen (author), Dooms, Bram (author), Van Itterbeeck, Petra (author)
Although there has been extensive research and several demonstration projects in Belgium and abroad, the use of recycled aggregates in concrete is still limited in practice. Several barriers were identified: lack of practical experience, limiting standards and the need for specific quality assurance. The paper describes recent developments in...
conference paper 2017
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Vrijders, Jeroen (author), Wastiels, Lisa (author)
The use of recycled aggregates in new structural concrete is generally considered as a measure for lowering the environmental impact of concrete. Existing literature considers transport distances and the final performance of the concrete (linked to its composition) as main influencing factors to evaluate the environmental burdens or gains when...
conference paper 2017
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Bougrain, Frédéric (author)
According to the European Commission website, construction and demolition waste (CDW - consisting of materials such as concrete, bricks, gypsum, wood, glass, metals, asbestos, excavated soil…) accounts for approximately 25% - 30% of all waste generated in the EU. To move towards a recycling society, various policies have been launched by...
conference paper 2017
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Symeonidou, I. (author), Hirschberg, U. (author), Kaftan, M. (author)
Designing the Negative was the title of a Master Studio that took place at the Institute of Architecture and Media of Graz University of Technology during the summer semester of 2012. Students designed and fabricated prototypes of customized concrete formwork as part of their studio assignment. The studio theme forced students to think about...
conference paper 2013
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Hilloulin, B. (author), Van Tittelboom, K. (author), Gruyaert, E. (author), Loukili, A. (author), De Belie, N. (author)
Now, most of the capsules used to contain polymeric healing agents in self-healing concrete, are made of glass. However, glass capsules cannot be mixed in concrete and are therefore placed manually into the moulds during concrete casting in laboratory tests. This represents a major drawback for an eventual industrialisation. In this study,...
conference paper 2013
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Mors, R.M. (author), Jonkers, H.M. (author)
A functional experimental concrete system has been developed in our lab, in which a two component bacteria-based healing agent contained in a protective reservoir is included in the concrete mixture. Incorporated bacteria have the potential to produce copious amounts of calcium carbonate based crystals from supplied mineral precursor compounds....
conference paper 2013
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Varini, M. (author), Koleva, D.A. (author), Denkova, A.G. (author), Mol, J.M.C. (author), Terryn, H. (author), Van Breugel, K. (author)
Polymeric nano-materials utilization in reinforced concrete, aiming to deal with steel corrosion was developed in previous works. Promising results were obtained with PEO–b–PS nano-formations, both in terms of enhanced bulk matrix properties and improved steel corrosion resistance. Recent research has been focusing on a cheaper and commercially...
conference paper 2013
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Snoeck, D. (author), Dubruel, P. (author), De Belie, N. (author)
Cementitious materials are sensitive to crack formation and it would be beneficial if the material could stop the crack propagation, repair the damage and reach again the original liquid-tightness and/or strength. Therefore, a cementitious material with synthetic microfibres and superabsorbent polymers (SAPs) is proposed. Upon crack formation,...
conference paper 2013
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Zhu, G. (author), Lü, L. (author), Tang, J. (author), Dong, B. (author), Han, N. (author), Xing, F. (author)
For epoxy microcapsules embedded in concrete as mechanic-triggered self-healing adhesive, globular shape with uniform size is the basic requirement to ensure the solid shell broken and the liquid core released at a designed stress. In this paper, monodispersed melamine–formaldehyde (MF) resin-walled epoxy E-51 microcapsules were successfully...
conference paper 2013
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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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Wiktor, V. (author), Sangadji, S. (author), Jonkers, H.M. (author), Schlangen, H.E.J.G. (author)
Bacterially induced calcium carbonate precipitation has received considerable attention for its potential application in enforcing or repairing construction material. The mechanism of bacterially mediated calcite precipitation in those studies is primarily based on the enzymatic hydrolysis of urea. Besides calcite precipitation, this reaction...
conference paper 2013
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Bernold, L. (author), Castel, A. (author)
Abstract only.
conference paper 2013
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