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    <copyright>Copyright © 2026. National Academy of Sciences. All rights reserved.</copyright>
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    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>Assessment of Drill Shaft Capacity and QA/QC from Measuring While Drilling</title>
      <link>https://rip.trb.org/View/1983912</link>
      <description><![CDATA[The objective of this research are (1) using Florida Department of Transportation (FDOT) Measuring While Drilling (MWD) criteria (FM 5-625), develop a versatile data analysis tool that will be used to provide drilled shaft MWD quality assurance/quality control (QA/QC); (2) conduct a feasibility study to identify the requirements of providing on-site and remote monitoring capabilities to enhance the QA/QC method; (3) monitor at least one load tested shaft and three production shafts at three independent sites to develop correlations for QA/QC purposes; (4) provide a QA/QC report for all shafts monitored during the research; (5) compare test results (from load tests and lab unconfined compression results) with previously derived correlations.]]></description>
      <pubDate>Mon, 20 Jun 2022 08:08:20 GMT</pubDate>
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      <title>TRC2204 - Materials and Testing for Drilled Shaft Concrete</title>
      <link>https://rip.trb.org/View/1897261</link>
      <description><![CDATA[Drilled Shafts are a common bridge foundation system used in Arkansas. Previous research has established best practices for mixture designs, mixing, placing, and testing drilled shaft concrete, but this work has not been implemented in Arkansas. Self-consolidating concrete can be used in drilled shafts to solve issues of aggregate segregation and consolidation. The purpose of this project is to determine a mix design for SCC that can be utilized across the state. Along with a new mix design, testing procedures are needed for SCC in the field, as well as specification for required QA/QC testing of drilled shaft concrete.]]></description>
      <pubDate>Mon, 13 Dec 2021 17:46:33 GMT</pubDate>
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      <title>Calibration of LRFD Geotechnical Axial (Tension and Compression) Resistance Factor for Driven Piles and Drilled Shafts</title>
      <link>https://rip.trb.org/View/1440840</link>
      <description><![CDATA[Geotechnical resistance factors that are specified in Section 10 of California Amendments to American Association of State Highway ad Transportation Officials  Load and Resistance Factor Design (AASHTO LRFD 2008 and 2011) have been developed based on resistance factors used in Load Factor Design (LFD) practice of California Department of Transportation (Caltrans), and also calibration for load factors used in LFD and LRFD practices. Although acceptable for a short transition period, such calibration needs to be improved to be consistent to LRFD methodology in designing foundations based on a uniform risk of failure and reliability index. Several parameters such as Quality Control (QC) and Quality Assurance (QA) measures that may be department-specific, as well as design assumptions that may be project specific need to be considered for an efficient calibration.  This Task will use existing Caltrans pile load test data to develop LRFD resistance factors for driven piles and drilled shafts.]]></description>
      <pubDate>Wed, 28 Dec 2016 11:39:49 GMT</pubDate>
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      <title>Cyclic Behavior of Self-Consolidated Concrete</title>
      <link>https://rip.trb.org/View/1320624</link>
      <description><![CDATA[Self-consolidating concrete (SCC) is an innovative type of concrete technology with significantly enhanced fresh properties that eliminates the need for mechanical vibrations. SCC is characterized by its ability to flow through structural elements under its own weight, filling every corner of the formwork, even in the presence of congested steel reinforcement. Currently, the Nevada Department of Transportation (NDOT) uses SCC mainly for casting drilled shafts. Several federal agencies are currently promoting the expansion of SCC use for all the advantages it provides. This project has two folds. The first fold is sponsored by NDOT where the effects of concrete pumping, tremie use, form shape, local aggregate properties, casting height and/or reinforcement congestion would be investigated. The first fold will conclude with proposing different mixes to be used by NDOT for SCC applications. The second fold will be sponsored by Missouri University of Science and Technology NUTC. The second fold will investigate the cyclic behavior of SCC and will be compared to cyclic behavior of conventional concrete.]]></description>
      <pubDate>Wed, 20 Aug 2014 01:00:38 GMT</pubDate>
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