Manhole covers
The durability and high strength of CRC Is utilised in manhole covers. The covers which have a diameter of 70 cm weigh less than SO kg, but they are able to sustain loads of more than 25 tons.
The covers cost more than conventional concrete covers, but they are stronger and weigh less. Compared to cast iron covers they weigh more but cost less. As the covers are also more durable against chemical attack, they are a niche product with a considerable market potential.
Drain covers
As problems were encountered with cast-iron drain covers a cost-effective solution was obtained with CRC covers. With a height of 40 mm and a concrete cover of only 10 mm it was possible to guarantee 100 years of design life In an aggressive environment with a strength that was more than adequate. More than 40,000 covers were produced.
The project was initiated because of Interference with the electrical installations from the cast iron covers, which required electrical insulation of each cover. Tha choice of CRC covers solved the problem and it also gave a cosiderable cost reduction.