Foundation Specifications 0182

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Slurry Displacement Piles

CALTRANS FOUNDATION MANUAL

and cleans the mineral slurry. Samples for testing shall be taken from the slurry plant

storage tank and the bottom of the drilled hole. As the mineral slurry is recirculated and

cleaned, samples shall be taken every two hours for testing until the test values for the

samples taken at the two testing locations are consistent. Once the test samples have

consistent test values, the sampling and testing frequency may be reduced to twice per

workshift. As the recirculation and cleaning process continues, the properties of the mineral

slurry will eventually conform to the specification parameters. Once the test samples have

properties within the specification parameters, the bottom of the drilled hole can be

If the continuous agitation in the drilled hole method is used, the contract specifications do

not require the mineral slurry to be physically cleaned. Samples for testing shall be taken at

the midheight and at the bottom of the drilled hole. As the mineral slurry is continuously

agitated, samples shall be taken every two hours for testing. If the samples at the two

locations do not have consistent test values, the mineral slurry shall be recirculated. This

means that the continuous agitation in the drilled hole method is failing to keep the

suspended particles in the mineral slurry from settling. This is also an indication that the

mineral slurry is not clean enough to meet the specification parameters. Therefore, the

Contractor is required to abandon this method and use the recirculation method. However,

if the test samples do have consistent test properties within the specification parameters, the

bottom of the drilled hole can be cleaned.

Once the bottom of the drilled hole has been initially cleaned, recirculation or continuous

agitation in the drilled hole may be required to maintain the specified properties of the

mineral slurry. Usually the initial cleaning will stir up the settled materials at the bottom of

the drilled hole, thus requiring the mineral slurry to be recleaned so it meets the require-

ments of the contract specifications. Several iterations may be required before both the

mineral slurry and the bottom of the drilled hole are clean. To verify the cleanliness of the

mineral slurry, the contract specifications require additional samples to be taken for testing.

Samples shall be taken at the midheight and at the bottom of the drilled hole. Once the test

samples show the mineral slurry’s properties to be within the specification parameters and

there is no settled material on the bottom of the drilled hole, the last cleaning of the bottom

of the drilled hole can be considered to be the final cleaning. At this point, the rebar cage

can be placed. The contract specifications require that samples for testing be taken just

prior to concrete placement to verify the properties of the mineral slurry. Samples shall be

taken at the midheight and at the bottom of the drilled hole. If the test samples have

consistent test properties within the specification parameters, concrete may be placed.