United States Department of Transportation
i
Optimizing the use of the thermal integrity system for evaluating auger-cast piles : final report.
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2016-07-01
[PDF-26.37 MB]
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Edition:Final report
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Abstract:Auger-cast piles (sometimes called auger-cast-in-place, or ACIP, piles) are a subset of the larger
category of deep foundation elements known as bored piles. Although similar to drilled shafts at first
glance, ACIP piles differ in the construction processes and design capacity. Therein, ACIP piles
require no slurry or casing to hold open the excavation; rather, a continuous flight auger is used which
maintains the stability and volume of the excavation via the soil that fills the auger flights. In this
regard, no means of inspecting the dimensions of the borehole is provided and the as-built pile
dimensions can only be inferred from grout pumping logs. The resultant shape of the foundation
element is further dependent on the rate of auger extraction relative to the grout pumping rate. With
this in mind, there is concern of the as-built shape and integrity. As such, use of ACIP by the Florida
Department of Transportation (FDOT) has been limited to foundations for sound walls.
The thermal integrity test has proven to be an effective method to evaluate the integrity of newly
constructed drilled shafts (i.e. identifying anomalies, rebar cage alignment, concrete cover, etc.).
However, very few auger-cast piles have been tested with this method as standard integrity access
tubes are not typically installed. If an improved quality assessment tool is developed to ascertain the
final, as-built configuration (size, depth, diameter, concrete cover, etc.) of auger-cast piles, their use in
other applications can be reevaluated. The results of this study showed the limitations of various
instrumentation schemes and introduced alternate analysis methods specific to ACIP piles.
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