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document
Valcke, S.L.A. (author), Nijland, T.G. (author), Larbi, J.A. (author), TNO Bouw en Ondergrond (author)
conference paper 2010
document
Valcke, S. (author), Nijland, T.G. (author), Larbi, J.A. (author), TNO Bouw en Ondergrond (author), BenO (author)
The water cement (w/c) ratio is a typical quality parameter for concrete. The NT Build 361 Nordtest method is a standard for estimating the w/c ratio in hardened concrete and is based on the relationship between the ilc ratio and the capillary porosity in the cement paste. The latter can be estimated using fluorescent light microscopy of...
conference paper 2009
document
van Hees, R.P.J. (author), Nijland, T.G. (author), Larbi, J.A. (author), TNO Bouw en Ondergrond (author)
conference paper 2009
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
van Hees, R.P.J. (author), Nijland, T.G. (author), Larbi, J.A. (author), Wijffels, T.J. (author), Brocken, H.J.P. (author), TNO Bouw en Ondergrond (author)
The characterisation of two ancient mortars in historic bridges, suffering damage due to thaumasite and other swelling compounds is described. Characterisation was part of the analysis of damage occurring to the brick masonry structure. Expansive reactions were found to have taken place, being the cause of the damage to the masonry. In both...
conference paper 2005
document
Nijland, T.G. (author), Larbi, J.A. (author), Siemes, A.J.M. (author), TNO Bouw (author)
An overview is given of experience of alkali-silica reaction, ASR, in the Netherlands, reflecting on concrete mixes and aggregates involved, and the assessment of ASR affected structures. Recently published guidelines to prevent concrete damage due to ASR are introduced. These rely on limiting the effective amount of alkali available for...
conference paper 2003
document
Larbi, J.A. (author), Nijland, T.G. (author), TNO Bouw (author)
Metamorphic petrology is a branch of geology that deals with the study of changes in rocks due changing physio-chemical conditions. As conditions shift in or out of the thermodynamic stability field of phases, new phases may appear whereas others disappear. A basic approach is mapping of so-called isograds, which are lines separating the...
conference paper 2001
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