Recycled Polymer application during pile boring operations: A review-PPT Presentation

PPT Presentation

Pdf Summary

The review examines the use and recycling of polymer support fluids in bored-pile construction, particularly for marine works. These fluids stabilize boreholes during drilling and before concrete placement. Their performance is monitored through viscosity, density, sand-content and pH tests, with fresh polymer added to used slurry as needed to meet recommended values.<br /><br />Compared with bentonite, polymer generally requires less mixing and flushing, does not require desanding equipment, and can improve site productivity. The presentation also describes polymer as easier to handle, reuse and dispose of. Polymer is used in sandy, clayey and silty soils; water flushing may be suitable in hard or soft rock.<br /><br />The pile-boring sequence includes surveying and positioning, pitching the liner, drilling while flushing with polymer, testing the fluid, lowering the tremie pipe, and placing concrete. During slurry regeneration, returned fluid passes through a system of tanks for storage, sedimentation and reuse. The review recommends checking fluid properties at different stages, including before concreting, and replenishing the slurry based on test results.<br /><br />For final disposal, the presentation describes treating polymer slurry with household bleach containing 5% sodium hypochlorite, at a stated 1:1 ratio to the amount of polymer used. The treated slurry is mixed and sent to an appropriate landfill, rather than discharged into the sea.<br /><br />The authors conclude that polymer fluids can be effective supporting fluids for pile boring when used in accordance with relevant recommendations and manufacturer guidance. They also note that additives such as sodium silicate, aluminum silicate and sodium hydroxide may help address challenging ground conditions, including borehole collapse and fluid loss.

Keywords

polymer support fluids

bored-pile construction

marine works

borehole stabilization

slurry recycling

viscosity testing

density testing

sand-content test

pH monitoring

tremie concrete placement