Slipform Open Channels
A popular system with many profile variations.
In the UK invert gradients of up to 22% have been tested to ensure that errant vehicles are not destabilised should they cross the channel.
In the case of a direct replacement of a pre-cast system both the element and the bedding are constructed monolithically. The insitu mass does not require backing concrete.
Typically a 35N air entrained concrete is proposed although higher strength mixes are available if required.