Foundation Specifications 0181

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Slurry Displacement Piles

concrete retains high fluidity throughout the length of the pour. The amount of detail

required for the Contractor’s submittal will vary based on the size and depth of the drilled

Concrete Compressive Strength and

Consistency Requirements

Before any pile construction work using the slurry displacement method can begin, the

Contractor shall demonstrate the concrete mix design can meet the required compressive

strength requirements and consistency requirements. This is accomplished by producing a

concrete test batch. The concrete test batch must demonstrate the proposed concrete mix

design achieves the specified nominal penetration at the time of placement and a penetra-

tion of at least 2 inches after a period of four hours has passed from the time of placement.

The intent of this specification is to make sure the first load of concrete placed in the drilled

hole will remain sufficiently fluid as it rises to the top of the pile. The concrete must also

have a high fluidity in order to flow through the rebar cage, compact and consolidate under

its own weight without the use of vibration, and to deliver high lateral stresses on the sides

of the drilled hole in order to keep the drilled hole from collapsing as the drilling slurry is

displaced and the filter cake (in the case of mineral slurries) is scoured from the sides of the

drilled hole by the rising column of concrete. The concrete test batch and compressive

strength requirement give the Engineer and the Contractor the opportunity to observe how

the concrete mix will behave before it is used.

Slurry Testing and Cleaning Requirements

During pile construction work, the contract specifications require the Contractor to sample

and test the drilling slurry in order to control its physical properties. The contract specifica-

tions also require that each type of drilling slurry be sampled and tested at different inter-

For mineral slurries, samples shall be taken from the mixing tank for testing prior to the

mineral slurry’s introduction into the drilled hole. Once the mineral slurry has been

introduced into the drilled hole, the contract specifications require the mineral slurry to

undergo either recirculation or continuous agitation in the drilled hole. The Contractor

must address which method of agitation will be used in the pile placement plan.

If the recirculation method is used, the contract specifications require the mineral slurry to

be cleaned as it is recirculated. This is done using a slurry plant, which stores, recirculates,