Naviduct Shiplock Floor

The Krabbersgat-locks at Enkhuizen are the Netherlands' busiest recreation locks. This unique structure is called a Naviduct and is the world's first and only combination of an aqueduct and a ship lock. Because the bridge, located in the Enkhuizen-Lelystad dike, has to be opened for almost every ship, long waiting times are a regular occurrence during the high season. The construction of the Naviduct solved the traffic jams on the road and on the water.

The ship-lock floor, situated about 5 meters (16.4 feet) below the water table, had a water penetration of 80 mm (3.1 in.) compared to a specification for a maximum penetration of 20 mm (0.8 in.).

Solution

The Krystol Concrete Waterproofing system was chosen by the Infrastructual dept. of the Dutch Government after a successful water penetration test done by the independent institute INTRON.

The test, performed according to DIN 1045 water penetration standards, made clear that Krystol is an in depth waterproofing system and not a surface coating.

Krystol was applied to one sqare meter (11 square feet) of the shiplock, 3 cylinders were drilled out and tested by INTRON. After putting water pressure on the cylinders for seven days the penetration was reduced to max. 5 mm (0.2 in.), well below the 20 mm (0.8 in.) requirement. Subsequent surface removal (2mm) showed continued results well below specifications of 20mm max.

Krystol T1 has been applied on the whole ship-lock floor 600 sqare meters (6500 square feet) to reduce / prevent water penetration and to meet to the specifications. Six weeks after the application another test was conducted. INTRON measured a maximum water penetration of 4 mm (0.16 in.) instead of the 80 mm (3.1 in.) in the reference cylinders.