CONTENTS FEATURES I DFI Executive Director Theresa Engler [email protected] Executive Editor Dr. Antonio Marinucci, M.B.A., P.E. [email protected] Managing Editor and Advertising Manager Graphic Design Karol Paltsios [email protected] Faye Klein Michael H. Wysockey, Ph.D., P.E. President Matthew Janes, P.Eng. DFI Executive Committee James O. Johnson Vice President Treasurer Gianfranco Di Cicco Secretary Past President Dan Brown, Ph.D., P.E., D.GE Mike Kelley Gerry Houlahan, P.E. Frank Haehnig Conrad W. Felice, Ph.D., P.E. Other Trustees K.S. Rama Krishna, Ph.D. Anne Lemnitzer, Ph.D., P.E. Matthew E. Meyer, P.E. J. Erik Loehr, Ph.D., P.E. Dan MacLean, P.E. Morgan NeSmith, P.E. David Paul, P.E. Howard Perko, Ph.D., P.E. Thomas D. Richards, P.E., D.GE Lori Simpson, P.E., G.E. Stefano Valagussa Martin G. Taube , P.E., P.G. COVER STORY ® Howard A. Perko, Ph.D., P.E. 14 Emergent Grout Pile Technologies Grouted helical piles are being used to achieve higher capacity than conventional helical piles, as the grout piles are able to develop capacity in both end bearing and side resistance. This article presents a brief overview of the development of grouted helical piles, identifies some benefits and limitations, and provides load- displacement behavior from load testing performed on two types of grouted helical piles. 71 Member Profile: Silas Nichols, P.E., Valued FHWA Partner Rozbeh B. Moghaddam, Ph.D., M.B.A., P.E. 75 Empirical Assessment of Base Material for a Drilled Pipe Pile A qualitative shaft inspection device, SQUID, was used at a bridge project in Norway to assess the base material at the tip of drilled piles and to evaluate the rock-foundation contact surface. The device consists of three penetrometers and three retractable plates to measure the resistance to penetration and displacement, respectively, due to an applied axial force, which provides an indication of material strength. DEEP FOUNDATIONS • MAR/APR 2019 • 3 O T N A S D I N N S U T O I T F U E P T E E D
