Our work

Repairing and protecting asphalt

Damage to road surfaces cannot be avoided. Often, it occurs after only a few years of use. On national trunk roads in the Netherlands, this damage usually takes the form of stone loss from the porous surface layers. This is called ravelling, and patch repairs are normally carried out by filling the holes with cold asphalt mixes or by using rejuvenators.

The market has developed a number of maintenance techniques that, depending on the extent of the damage, can be used to extend the service life of a road surface. TNO focuses on assessing and validating these repair materials and techniques. Validation can relate to technical, economic and/or sustainability aspects. In this context we are working on the testing of preventive measures for extending the service life of national trunk roads. These can be used at an early stage, and extend service life by as much as 30%. The testing of repair techniques takes account of their social costs and benefits. Maintenance decisions are thus based on much more than the contracting price alone.

Postponing repair

TNO has also developed methods that make is possible to postpone maintenance and repair by taking measures at the construction stage to protect roads more effectively against external effects (e.g. the effects of the air, UV radiation, water and dirt). In this field, for example, we are developing an application to combat asphalt ageing.

Our work

Innovative asphalt mixtures

Innovative asphalt mixtures provide possibilities for improving the performance of roads. They can help to reduce costs (e.g. maintenance costs) and increase the sustainability of our infrastructure. ... Read more
Our work

Road measurement and monitoring

More than 80% of national roads in the Netherlands are surfaced with ZOAB (the Dutch acronym for dual-layer porous asphalt). Their condition has to be monitored to ensure safety and to determine if maintenance... Read more

Cementless, 100% locally made blocks for energy efficient housing

16 September 2020
The biggest obstacle in scaling Compressed Earth Blocks for housing is the price and environmental effect of cement which needs to be used as a binder. 5-7% of the block is cement, responsible for 50%... Read more

Boosting affordable housing with cementless blocks

16 January 2020
The market demand for construction materials is tremendous in developing countries due to a growing population. To tackle the disadvantages of hollow concrete blocks and burnt bricks Oskam , LEVS and... Read more

License agreement on innovative cool bricks in Malawi

05 July 2019
TNO and Terrastone ltd – a major construction firm in Malawi – signed a license agreement to kick off the production of cold ceramic bricks. TNO developed these strong, red ‘cool bricks’, which can be... Read more


Ing. Dave van Vliet

  • road construction
  • road construction materials
  • roads
  • asphalt
  • bitumen


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