Therefore,considera ble effort is undertaken by product manufactures to improve the opentime. TNO has worked together with several industrial partners on this topic. However,the exact processes that determine the open time of glue mortars are unclear.To efficiently improve the products knowledge of the processes that determinethe open time and adhesive force is important. Several processes can determinethe open time: chemical reactions (carbonation), water content, water transport, concentration and transport of additive materials. In this project the
aim is to measure and model these processes and relate them to the opentime.
One of the techniques that will be applied to investigate the transportprocesses is nuclear magnetic resonance (NMR) imaging. With NMR nuclei such asH, F, P, Na can be measured. With NMR it is feasible to measure transportprocesses, chemical changes, pore size distribution and possibly also the flowof additive materials. Next to NMR other measurement techniques will be appliedto investigate chemical and structure changes, such as: optical imageprofiling, SEM, FT-IR, TGA, etc.
End procedure:31 January 2010
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