Augered Cast-in-Place and Drilled Displacement Pile

This committee comprises a roster of industry-wide professionals involved in the design, understanding, advancement and use of augered cast-in-place (ACIP) and drilled displacement pile foundation systems.

Hannah Lezzoni

Committee Chair

Hannah Iezzoni, P.E.
[email protected]

Hannah Iezzoni, P.E., a design engineer with Keller North America, has 10 years of industry experience in design and construction of deep foundations, ground improvement, grouting, dam infrastructure and earth retention projects. Iezzoni is an active member of numerous industry groups, including chair of DFI’s Augered Cast-in-Place and Drilled Displacement Pile Committee and the engineering representative for Keller’s internal Micropile and Anchor Product Team. She graduated from Northwestern University in 2012 with a B.S. in civil engineering and from the University of Colorado in 2014 with a M.S. in civil engineering. Iezzoni is a recipient of a 2021 DFI President’s Award, which recognizes outstanding contributions and service of institute members.


Low Headroom ACIP Installation

Supplement to DFI ACIP Piles Manual

Stability of Large Diameter ACIP Piles

Evaluating lateral bracing code requirements for large diameter foundations

Ongoing Research

  • Lateral Stresses During DD Pile Installation – Monitoring installation of small-scale drilled displacement piles to assess radial effect and extent of lateral stresses and displacements
  • Evaluation of In Situ ACIP Pile Volume – Conducting thermal integrity profiling on ACIP test piles and analyze to assess in place diameter
  • Seismic Performance of Rigid Inclusions – numerical simulation study of rigid inclusions installed in liquefiable soils to show the effect of various design parameters and demonstrate how coupled use of typical site response and lateral loading analyses that practitioners perform on a daily basis can sufficiently capture the critical aspects of our research findings


DFI Augered Cast-in-Place Piles Manual, Third Edition – guidance for installation and quality assurance and control of ACIP Piles and a model specification.

DFI Guideline for Interpretation of Nondestructive Integrity Testing of Augered Cast-in-Place and Drilled Displacement Piles – practical guidance for the interpretation of nondestructive testing (NDT) of the integrity of augered cast-in-place (ACIP) and drilled displacement (DD) piles.

Augered Cast-In-Place Piles Inspector’s Guide, Second Edition, 2010 – summarizes the requirements expected of all parties concerned in the successful installation of ACIP piles.

FHWA Geotechnical Engineering Circular No. 8 Design and Construction of Continuous Flight Auger (CFA) Piles.

GeoConstructability – An Owner’s Guide to Obtaining Essential Geotechnical Information for Construction (documents the type of geotechnical information  that contractors need to estimate, plan and execute foundation projects).