Renewal Noordeindseweg Delft

Foam bitumen as a solution

The old Noordeindseweg had suffered many cracks and irregularities because of the sensitive peat soil. Foam bitumen stabilisation therefore offered a solution: we mixed the old asphalt road and added foam bitumen and the durable cement to the milling material. This solution can move more easily with deformations, without causing the construction layer to crack. Ideal for road constructions on peat substrates. This is how we achieved a flexible, sustainable and load-bearing foundation.

Test pieces and mixtures

On the Noordeindseweg, we reused as many construction materials as possible. But: how does the most suitable mixture come about? In the laboratory of DIBEC Materiaalkunde we composed 5 possible mixtures that differ in the amount of bitumen to be added and different types of cement. After making and examining the samples, the most suitable mixture emerged: 60% asphalt granulate and 40% slag granulate, plus 2.5% bitumen and 1% ground granulated blast furnace slag: the sustainable cement Eco2cem proposed by TNO. This chosen asphalt mixture met the required paving properties and provided the maximum EIP reduction compared to the standard mixture.

Testing, testing, testing

With data and technology, we ensured that the renewed road has the highest possible quality. Drill core investigations showed that the existing bonded slag foundation contained a steel reinforcement, after which we used radar measurements to determine at what depth this reinforcement lies. We processed this data into a detailed map to prevent damage to the chisels during milling.

A truly sustainable solution

Our sustainable solutions go beyond circularity. We carried out some of the road works using electrical equipment and green energy. In addition, we made the verges more biodiverse and the traffic signs bio-based.

The result: a green and safe road. The bumpy, outdated road has been transformed into a smooth road that lasts for years to come.