November/December 2022 - 98

willingness to accept reuse as a
desirable component of new work.
Additionally, there are likely areas of
research and innovation with respect to
measuring and estimating the value of
re-use by a variety of means (cost,
schedule, materials, transportation/
traffic, energy, natural resources, CO2,
etc.). There is also a need to pursue educational
material development, organizational
partnerships and interdisciplinary
development of tools and
project documentation, such as benefits
to projects' " bottom line " and the benefits
of investing in sustainable practices.
DFI's Foundation Reuse Task Force is
working to help promote efforts related
to guidance and outreach. It has
published case history documents that
demonstrate the feasibility and benefits
of reuse. The task force is also
developing white papers addressing
guidance needs, promoting research
efforts related to condition assessment
and service life estimates, and promoting
industry discussions of foundation
reuse, including a panel session
at next July's Geo-Risk 2023 conference
organized by the American Society of
Civil Engineers' Geo-Institute.
Our colleagues in vertical construction
are ahead of us, especially in
cities with congested underground
conditions, like those in Europe. Energy
efficiency and other " green " environmental
certifications are increasingly
common in the building industry
worldwide. As sustainable construction
increases in interest, and acceptance,
carbon calculators and other
tools will become integral components
in project planning, and by extension,
design and construction including
underground elements.
The Triple Bottom Line
Foundation reuse fits well in the
framework of FHWA's " triple bottom
line " of sustainability, benefiting
environmental, economic and social
outcomes. Economic factors include
reconstruction and demolition cost
savings, potentially reduced right of
way acquisition time and process,
reduced project time, reduced utility
impacts and coordination, and reduced
user costs. Environmental permitting
and National Environmental Policy Act
processes may be simplified, waste
reduced and air quality improved
The Federal Highway Administration
(FHWA), as part of the Sustainable
Highways Initiative, has
created a sustainability measurement
tool " INVEST. " While this tool does not
include specific consideration of
foundation reuse as a project development
criterion, at this time, this is the
type of planning application where
reuse could eventually be considered
within an overall project sustainability
scoring framework. More information
about the INVEST tool (current version
1.3) is available at: https://www.
sustainablehighways.dot.gov/
through reduced emissions. Socially,
there can be reduced mobility impact,
reduced noise, reduced community
impact, improved work zone safety,
reduced cultural or archeological
impacts, and reduced traffic disruption
or congestion. Further information on
foundation reuse for transportation
structures is available online in
publication No. FHWA-HIF-18-055
Foundation Reuse for Highway Bridges
November 2018.
Long-Term Investment
Foundation reuse is basically about
extending an initial project investment.
Foundations are generally built
to be robust, and they generally do not
suffer the same stresses, deterioration
mechanisms and degradation associated
with above ground structural
elements. Some foundations have been
in place and functioning for thousands
of years. Structural service loadings are
usually a small fraction of the geotechnical
and structural capacities and
in many cases a thoughtful analysis or
project champion may be the missing
element to implement a sustainable,
functional solution as compared to the
time, effort and expense of building again.
Derrick Dasenbrock, P.E., D.GE, F. ASCE, is a
geotechnical engineer at the U.S. Department
of Transportation's Federal Highway
Administration Resource Center, Minneapolis.
Thanks to Dipanjan Basu, professor at the
University of Waterloo, for insights related to
this article. For additional reading on life
cycle assessment of the global environmental
impacts of drilled shafts: Lee. M., and Basu,
D., Environmental impacts of drilled shafts
in sand. Proceedings of the Institution of Civil
Engineers - Engineering Sustainability,
https://doi.org/10.1680/jensu.21.00091
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November/December 2022

Table of Contents for the Digital Edition of November/December 2022

TOC
November/December 2022 - Intro
November/December 2022 - 1
November/December 2022 - 2
November/December 2022 - TOC
November/December 2022 - 4
November/December 2022 - 5
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