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Jonkers, H.M. (author)The present invention relates to healing agent in cement-based materials and structures, wherein said healing agent comprises organic compounds and/or bacteria-loaded porous particles, which porous particles comprise expanded clay- or sintered fly ash. Furthermore, said porous particles are intact spheres, broken or crushed particles derived...patent 2009
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Schlangen, H.E.J.G. (author), Jonkers, H.M. (author), Qian, S. (author), Garcia, A. (author)In this paper an overview is given of new developments obtained in research on self healing of cracks in cement based materials and asphalt concrete. At Delft University various projects are running to study self healing mechanisms. The first project that is discussed is Bacterial Concrete, in which bacteria are mixed in concrete, that can...conference paper 2010
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Jonkers, H.M. (author)A typical durability-related phenomenon in many concrete constructions is crack formation. While larger cracks hamper structural integrity, also smaller sub-millimeter sized cracks may result in durability problems as particularly connected cracks increase matrix permeability. Ingress water and chemicals can cause premature matrix degradation...journal article 2011
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- Wiktor, V.A.C. (author), Jonkers, H.M. (author) conference paper 2011
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- Zemskov, S.V. (author), Jonkers, H.M. (author), Vermolen, F.J. (author) conference paper 2011
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Jonkers, H.M. (author)The invention provides a process for the production of a cementious material. The process comprises mixing cement starting materials and a particulate healing agent to provide the cementious material. The healing agent comprises coated particles, wherein the coated particles comprise bacterial material and additive. The bacterial material is...patent 2011
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Wiktor, V. (author), Jonkers, H.M. (author)La formation d’un réseau continu de fissures contribue à l’augmentation de la perméabilité du béton, réduisant ainsi de manière importante sa résistance à l’attaque d’agents agressifs dissous dans l’eau. Afin d’augmenter la capacité de cicatrisation autogène du béton, certains agents cicatrisants spécifiques peuvent être incorporés dans la...journal article 2011
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Jonkers, H.M. (author)In 2006 a research program was launched at Delft University of Technology aiming for the development of a new class of materials, i.e. materials with an inbuilt healing mechanism. The idea is that these novel materials can self repair damage resulting in substantially decreased maintenance and repair costs and increased service life. Several...conference paper 2012
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Mors, R.M. (author), Jonkers, H.M. (author)Concrete in most structures is designed to crack in order to let embedded steel reinforcement take over tensile stresses. Crack formation is also a typical phenomenon related to durability. Percolation of cracks may lead to leakage problems or ingress of deleterious materials, causing deterioration of the concrete matrix or corrosion of embedded...conference paper 2012
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- Wiktor, V.A.C. (author), Jonkers, H.M. (author) conference paper 2012
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- Sierra Beltran, M.G. (author), Jonkers, H.M. (author) conference paper 2012
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- Jonkers, H.M. (author), Carr, N.N. (author) conference paper 2012
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- Wiktor, V.A.C. (author), Jonkers, H.M. (author) conference paper 2012
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Mors, R.M. (author), Jonkers, H.M. (author)Crack formation in concrete is common, but a typical phenomenon related to durability. Percolation of cracks may lead to leakage problems or ingress of deleterious materials, causing deterioration of the concrete matrix or corrosion of embedded steel reinforcement. Durability can be enhanced by preventing further ingress of water and other...conference paper 2012
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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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Jonkers, H.M. (author), Palin, D. (author), Flink, P. (author), Thijssen, A. (author)Concrete constructions in the marine environment suffer from chemical attack of sea salts which can induce damage to both the concrete matrix and embedded steel reinforcement. For example, ingress of sulfate and chloride ions can respectively result in detrimental ettringite formation and enhanced corrosion of the steel rebars. The first...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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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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Leon Fuenmayor, E.J. (author), Koleva, D.A. (author), Jonkers, H.M. (author), Mol, J.M.C. (author), Terryn, H. (author), Van Breugel, K. (author)Impressed current cathodic protection (CP) based on pulse technology has been proven to be a more efficient and effective alternative of traditional CP for reinforced concrete applications. Essentially, the superiority of pulse CP is in achieving the required steel polarization with otherwise reduced side effects (e.g. influence on bond strength...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