Influence of Material Type, Aggregate Size, and Unconfined Compressive Strength on Water Jetting of CIDH Pile Anomalies [thesis]

Joseph Carl Heavin
Influence of Material Type, Aggregate Size, and Unconfined Compressive Strength on Water Jetting of CIDH Pile Anomalies Joseph Carl Heavin Water jetting as a means for removing anomalous materials from cast-in-drilled-hole (CIDH) piles was examined. The primary objective of this research was to establish empirical relationships between different jetting parameters and the removal of commonly occurring anomalous zone materials, including low-strength concrete, slurry mixed concrete, grout, and
more » ... ay soil. Also investigated was the current standard-ofpractice used by water jetting contractors within California. The testing specimens consisted of typical anomalous material with unconfined compressive strengths between 5 and 6,000 psi. The experimental work consisted of water blasting submerged specimens using rotary jets, nozzles, and pumping equipment typically used in construction practice. Two testing protocols were developed. The first testing protocol called for the nozzle to be held stationary and the second allowed the nozzle to be cycled up and down across the anomaly. During testing, material removal rates were measured as a function of jet pressure and standoff distance. Water blasted specimens were cut apart after testing to confirm erosion measurements and to permit inspection of the water blasted surfaces. Based on the results, erosion rates and the effectiveness of water jetting are primarily influenced by unconfined compressive strength, when using standard test equipment and jetting pressures. Further, aggregate size and material type in the anomalous material does not appear to influence both total erosion and erosion rate. v ACKNOWLEDGEMENTS Special thanks go out to: Caltrans for financial support (Contract No. 65A0299) and initial guidance. ADSC for assistance with establishing the current water jetting standard of practice. Dr. Gregg Fiegel for selecting me for this research and for his continued guidance, support and patience. Drs. Jay DeNatale and Dan Jansen for their insight, support and review of the material in this thesis. Will Smith for allowing the use of Case Pacific's personnel and water jetting equipment; Matt Schlotterbeck for helping coordinate testing in the Case Pacific yard in Paso Robles; and Randy Verdell for his support of this project through many hours operating the water jetting equipment. Brain Liebich and Jason Wahleithner of the Caltrans Foundation Testing Division for their insight on this project. Hanson Aggregates and CalPortland for their thoughtful donation of materials. research assistants, for the many long days spent in Paso Robles and the many hours spent in the lab. Katherine Hammers, for her loving support and compassion throughout this project. My parents and family for their support and continued motivation to finish this project.
doi:10.15368/theses.2010.35 fatcat:wskwokononf6vckjinog66ykx4