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Bernold, L. (author), Castel, A. (author)Abstract only.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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Krelani, V. (author), Ferrara, L. (author)The presence of cracks may significantly affect the life-cycle of structures, as a results of its influence on the designed structural response vs. persistent or even severe accidental load and exposure conditions, when requested. Repairing damaged concrete in existing structures needs important investments to recover the pristine level of...conference paper 2013
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Hazelwood, T. (author), Jefferson, A.D. (author), Lark, R.J. (author)Research has been carried out with the aim of better understanding the relevant properties of materials to be used in a new self-healing cementitious composite material system. The system consists of shape memory polymer tendons embedded within a cementitious matrix, upon heat activation these tendons undergo a shrinkage process which closes any...conference paper 2013
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Hilloulin, B. (author), Grondin, F. (author), Matallah, M. (author), Loukili, A. (author)Cracks, caused by shrinkage or external loading, reduce the durability of concrete structures as aggressive substances can easily enter in the capillary network of the cementitious matrix. Natural autogenous healing ability of concrete by further hydration or precipitation has been studied experimentally for many years. Autogenous healing of...conference paper 2013
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Palin, D. (author), Wiktor, V. (author), Jonkers, H.M. (author)Marine concrete structures are exposed to one of the most hostile of natural environments. Many physical and chemical phenomena are usually interdependent and mutually reinforcing in the deterioration of marine exposed concrete: expansion and microcracking due to physical effects increases concrete permeability paving the way for harmful...conference paper 2013
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De Belie, N. (author)Within the theme Self-healing materials for prolonged lifetime (NMP.2012.2.1-3) of the Seventh Framework Programme, self-healing concrete is an important topic. The project HEALCON, which deals with self-healing concrete to create durable and sustainable concrete structures, is funded by EU-FP7 and started in January 2013. The coordinator of...conference paper 2013
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Wang, J.Y. (author), Van Vlierberghe, S. (author), Dubruel, P. (author), Verstraete, W. (author), De Belie, N. (author)Self-healing concrete is regarded as a promising solution to reduce the high maintenance and repair cost of concrete infrastructure. Due to the limited autogenous healing capacity of concrete as such, additives are needed to enhance its self-healing properties. Among various strategies, microbial-based self-healing has gained increasing...conference paper 2013
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Hung, V.V. (author), Kishi, T. (author), Ahn, T.H. (author)Granulation technique, introducing the self-healing ability to concrete, was developed by Koide, 2010 [1] based on the capsulation technology in the food/medicine industry. In this research, self-healing granules, containing cement compounds, chemical and mineral admixtures, were fabricated by a proposed granulation process and the capability of...conference paper 2013
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Sangadji, S. (author), Wiktor, V.A.C. (author), Jonkers, H.M. (author), Schlangen, H.E.J.G. (author)Bacteria induced calcite precipitation has been proven to be effective in making concrete structure self-healing. In Microlab TU Delft, the concept has been enhanced by developing a liquid bacteria-based concrete repair system. The solution contains calcite precipitating bacteria, nutrients and buffer compound which may demonstrate high...conference paper 2013
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Narayanasamy, R. (author), Alvarado, A. (author), Sanchez Medrano, J. (author), Betancourt Hernandez, J. (author), Balagurusamy, N. (author)Sustainability or environment friendly green technology is based on the use of agents of biological origin that can mimic nature in their process applications. The production and use of conventional Portland cement is significant contributor to emission of greenhouse gases and the resultant global warming. Microbial induced carbonate...conference paper 2013
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Sangadji, S. (author), Wiktor, V.A.C. (author), Jonkers, H.M. (author), Schlangen, H.E.J.G. (author)Bacteria induced calcite precipitation has been proven to be effective in making concrete structure self-healing. In Microlab TU Delft, the concept has been enhanced by developing a liquid bacteria-based concrete repair system. The solution contains calcite precipitating bacteria, nutrients and buffer compound which may demonstrate high...conference paper 2013
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Wiktor, V.A.C. (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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Palin, D. (author), Wiktor, V. (author), Jonkers, H.M. (author)Marine concrete structures are exposed to one of the most hostile of natural environments. Many physical and chemical phenomena are usually interdependent and mutually reinforcing in the deterioration of marine exposed concrete: expansion and microcracking due to physical effects increases concrete permeability paving the way for harmful...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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De Belie, N. (author), Du Prez, F. (author), Terryn, H. (author), Wallaeys, B. (author)Abstract only.conference paper 2013
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Maes, M. (author), Van Tittelboom, K. (author), De Belie, N. (author)A lot of damage is reported for constructions in marine environments. Marine environments are very aggressive, because of the high chloride concentration in sea water. Chlorides affect durability by initiating corrosion of the reinforcement steel. When cracks appear in the concrete structures, chlorides will penetrate faster and will initiate...conference paper 2013
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Slobbe, A.T. (author), Hendriks, M.A.N. (author), Rots, J.G. (author)This paper presents a dedicated numerical test that enables to assess the directional mesh bias of constitutive models in a systematic way. The test makes use of periodic boundary conditions, by which strain localization can be analyzed for different mesh alignments with preservation of mesh uniformity and with exclusion of boundary disturbances...conference paper 2013
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Weerheijm, J. (author), Sharma, A. (author), Ozbolt, J. (author)The behavior of concrete structures is strongly influenced by the loading rate. Compared to quasi-static loading, on meso and macro-scale concrete loaded by impact loading acts in a different way. First, there is a strain-rate influence on strength, stiffness, ductility, and, second, there are inertia forces activated which influence the...conference paper 2013
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Weerheijm, J. (author), Lu, Y. (author), Xu, J. (author)This paper presents a numerical modelling study on the simulation of the cracking process and fracture energy in concrete under high strain rate. To capture the stress wave effect and the damage evolution at the meso-length scale, both a homogeneous model with a millimetreresolution mesh and an explicit heterogeneous mesoscale model with random...conference paper 2013