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Estimating the As-Placed Grout Volume of Auger Cast Piles – Part 1
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2024-07-01
[PDF-5.61 MB]
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Edition:Final Report 02/01/21-10/15/24
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Abstract:Auger cast piles have historically been used for private industry applications but not publicly funded infrastructure projects supporting bridge structures largely due to the lack of quantifiable quality assurance and quality controls. The development of computerized on-board drill rig monitoring systems and thermal integrity methods for auger cast piles removed many of the associated uncertainties. However, determination of the as-built grout volume confirming pile size remained problematic. This study evaluated the construction records, inspector reports, thermal integrity assessments, and physical measurements from 1179 auger cast piles to identify potential problems in construction and/or inspection but more importantly to establish a reliable means to estimate the as-built, in-pile grout volume. Recommendations stemming from the study findings promote the FHWA recommended best construction practices which state the drilling and grouting process should be performed without delay, without auger extraction prior to grouting, and making every effort to maintain a fully soil laden auger. Every effort should be made to reduce the frequency of re-stroking during auger cast pile construction which breaks the continuity of inspection data and potential harms/alters the lateral soil strength parameters.
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