I am going to use the polymer slurry to stablise the bore of 1.5m diameter piles, for a major bridge project in India. Can any one give me the following informations regarding polymer slurry :
a) What are the benefits of using the polymer slurry as against the conventional 'Bentonite Slurry'. b) What 'precautiona' & 'checks' are necessary at site for ensuring correct and appropriate use of polymer slurry. c) Is there any reduction in skin frictional capacity of bored piles, if polymer slurry is used?
We are using polymer in preference to bentonite in large diameter bored piles in Melbourne Australia. We find it is much more environmentally friendly (easier to dispose of by just adding bleach and reverting the polymer to water) and much cleaner on site. It also saves time as you do not have to desand as much after drilling prior to pouring concrete.
Because the polymer works in a differnt way to bentonite, you do not get thick filter cake buildup on the pile walls, and thus skin friction is not downgraded as much.
On site you will need to keep a close eye on polymer viscosity and pH. The pH is critical, as is the mixing of the polymer to ensure you create long chain lengths of polymer.
I would talk further with a polymer supplier to get the finer details of how to use it. Try contacting KB technologies who produce slurry pro in the USA for more details.