macjohnw
Civil/Environmental
- Aug 4, 2011
- 10
Hi,
We are currently repairing some concrete weirs. The constant problem we are experiencing is the abrasion found on the downstream side of the crown (see picture below). The sediment has erodes the concrete, exposes the aggregate and so decreases the durability.
The flow speeds of the river are high and the weirs designed as such to prevent the settling out of the sediments, thus lower design speeds are not an option.
What options are there to increase the abrasion resistance of the concrete to counter this effect? I do not like the "topping" type products that are plastered on top of concrete as it tends to layer off with time or on impact from objects. Fibers, hardeners?
We are currently repairing some concrete weirs. The constant problem we are experiencing is the abrasion found on the downstream side of the crown (see picture below). The sediment has erodes the concrete, exposes the aggregate and so decreases the durability.
The flow speeds of the river are high and the weirs designed as such to prevent the settling out of the sediments, thus lower design speeds are not an option.
What options are there to increase the abrasion resistance of the concrete to counter this effect? I do not like the "topping" type products that are plastered on top of concrete as it tends to layer off with time or on impact from objects. Fibers, hardeners?
