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Polyacrylamide / How does Polyacrylamide works in Bored Piling?

How does Polyacrylamide works in Bored Piling?
How does Polyacrylamide works in Bored Piling?
There are two usage in bore piling:
Polyacrylamide could be used like building glue additive, because of the high viscosity and water retention. So it could be mixed in slurry of borehole wall to get better efficiency. The cationic polyacrylamide is suggested.
Slurry is important to protect borehole wall, but surplus slurry need to be removed. So we put polyacrylamide into the slurry, as the flocculants, polyacrylamide could make the slurry to be water and sands, and the sands easy to be removed.