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concrete curing in stream channel

concrete curing in stream channel

concrete curing in stream channel

(OP)
Hello all,

I am the field manager for an Earth Science Research Group in Boulder, CO. I am in the process of installing a modified Parshall flume in one of my study areas and am running into a unique (i think) problem. I would like to set my flume in a bed of concrete which extends to exposed bedrock upstream. I have diverted 99% of the flow, but still have a small trickle seeping out from cracks in the rock. I know that concrete will cure underwater and I should install a flexible joint between the concrete and bedrock to prevent cracking of the concrete, but unsure of a material or method to solve the problem of curing while a trickle of water runs over the material in question. I will be sampling the water for chemistry after install is complete so i need something that will not influence water chemistry in any way. Maybe a special silicone or marine adhesive? any suggestions would be greatly appreciated.

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