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document
de Rooij, M.R. (author)
This is a summary paper focused on the diagnosis of the alkali–aggregate reaction (AAR) in concrete in practice.
article 2016
document
de Rooij, M.R. (author), Nijland, T.G. (author)
Op woensdag 17 augustus 2016 heeft TNO per e-mail een verzoek ontvangen van ProRail om voor 2 september 2016 een voorlopig oordeel te geven over aanvullend onderzoek dat door Railinfra Solutions (RIS) is uitgezet bij Pelcon Materials & Testing ApS in Denemarken( Pelcon) aangaande microscopisch onderzoek aan betonnen kernen van de Tunnel...
report 2016
document
Polder, R.B. (author), Nijland, T.G. (author), de Rooij, M.R. (author), Larsen, C.K. (author), Pedersen, B. (author)
road environment in The Netherlands for nearly a century. The experience is good and structures with long service lives can be obtained, as has been shown by several field studies. This is caused by a high resistance against chloride penetration and a high electrical resistivity, demonstrated both in the field and in the laboratory. Due to the...
conference paper 2014
document
de Rooij, M.R. (author), Godart, B. (author)
Alkali-aggregate reaction in concrete is the name given to a group of reactions leading to expansion caused by a chemical reaction between the alkalis contained in the cement paste and certain reactive forms of (usually silica containing) minerals in the aggregates, see Figure 4.The alkalis in the pore solution are derived from the hydration of...
bookPart 2013
document
de Rooij, M.R. (author)
bookPart 2013
document
de Rooij, M.R. (author), Godart, B. (author)
For any existing structure, a routine inspection is ordinarily a starting point of a cyclic process to maintain the safety and reliability of the structure (Figure 9). It is part of an inspection process where detailed inspection and in depth investigation are important actions. This chapter covers review of existing records, field equipment and...
bookPart 2013
document
Yaqoob, M.A. (author), Winogrodzka, A. (author), Fischer, H.R. (author), Gelinck, E.R.M. (author), de Rooij, M.B. (author), Schipper, D.J. (author)
The pre-sliding and static friction force behaviour at asperity level between a smooth ball and a smooth flat surface at different normal loads, as well as friction behaviour during full slip has been studied. The normal load dependence of the friction force and the preliminary displacement is discussed when the mean contact pressure is kept...
article 2013
document
de Rooij, M.R. (author), Godart, B. (author)
bookPart 2013
document
de Rooij, M.R. (author), Godart, B. (author)
From the confirmation inspection and its subsequent test results the presence of AAR has either been confirmed or eliminated. Assuming the first outcome, the next step is to investigate the severity of the situation, see Figure 23. One should keep in mind that it is possible that some evidence of AAR may be found in concrete where siliceous...
bookPart 2013
document
de Rooij, M.R. (author)
When routine inspection results, like examples given in the previous chapter, show indications which could point in the direction of AAR, it is a wise decision to bring in the specialists. As these specialists are normally brought in when something odd has been observed, the first step to be taken is to establish what the cause of the “strange”...
bookPart 2013
document
de Rooij, M.R. (author), Godart, B. (author)
Diagnosis of damage to concrete in structures caused by Alkali-Aggregate Reaction (AAR) often involves complex processes because of the resemblance of the external characteristics of the damage with those caused by other actions, such as e.g. frost attack or shrinkage. The wide variety of aggregate types used in concrete worldwide, the different...
bookPart 2013
document
Koster, T. (author), Peelen, W.H.A. (author), Larbi, J.A. (author), de Rooij, M.R. (author), Polder, R.B. (author), TNO Bouw en Ondergrond (author)
article 2009
document
de Rooij, M.R. (author), Polder, R.B. (author), TNO Bouw (author)
Nowadays important concrete infrastructure is increasingly being designed for long service life by modelling of degradation and probabilistic assessment of uncertainties, e.g. using the DuraCrete method. Although on paper a reliable and durable structure will result, it is the execution phase that can make or break the service life approach....
conference paper 2007
document
Nijland, T.G. (author), Larbi, J.A. (author), van Hees, R.P.J. (author), Lubelli, B.A. (author), de Rooij, M.R. (author), TNO Bouw (author)
A microscopic survey of over 1000 of samples of concrete and masonry mortars from structures in the Netherlands shows that, in practice, self healing occurs in historic lime and lime – puzzolana mortars, in contrast to modern cement bound concretes and mortars. Self healing may be effected by the formation of either new Ca-carbonate, CaCO3, or...
conference paper 2007
document
de Rooij, M.R. (author), TNO Bouw en Ondergrond (author)
Many walls of ancient buildings are covered with plaster layers. Amongst the most recurrent causes of damage of plasters and substrates are moisture and salt decay processes. To combat these salt problems, special salt resistant plasters have been developed for application on salt loaded substrates. However, experience in the field has shown...
article 2006
document
de Rooij, M.R. (author), Polder, R.B. (author)
For effective design for durability and maintenance, knowledge of the penetration process of chloride into concrete is of paramount importance. Such knowledge is important for accurate modelling of the time to initiation of reinforcement corrosion. In this paper the acquisition of model parameters for chloride penetration based on chloride...
conference paper 2003
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