Page 26 - LWFC Catalog

concrete-slab-on-grade tipping-floor elevated on earth fill between
20 feet and 24 feet high. It replaces a smaller transfer-building
about 20 years old, with a tipping-floor supported on 13 feet of fill.
The geotechnical study for the design revealed non-uniform soil
stratification that included near-surface clay soils. This combination of
non-uniform, earth-fill loading; non-uniform soil-stratification; and non-
uniform soil-stress-history, yielded estimated total settlements of two to
eight inches, and estimated differential settlements of four to six inches.
In addition, the times to achieve settlement equilibrium ranged from
Thursday a few days to about eight months, depending on location. This facility
is a critical component of Orange County’s solid-waste-management
October operations, so its construction schedule was compressed to 12 months,
with incentives for early completion and penalties for late delivery. Fill
21 placement for the tipping-floor slab-on-grade was on the critical path.
By strategically replacing portions of the conventional earth fill with
low-density-cellular concrete (“LDCC”) fill in defined zones within the
transfer-building footprint, the project team was able to reduce the
estimated total and differential settlements to about two inches. Using
LDCC fill also saved about five weeks on the earthwork activity, at a cost
that was acceptable to the Owner because it could enable the facility
to reopen sooner. Other unanticipated benefits included a reduction in
the sizes of the perimeter retaining-walls that confined the fill.

2PM - Experimental Dynamic Analyses of Lightweight Reinforced
2:50 PM Embankments Rotary-kiln produced expanded aggregates contribute
to reduction of structural demands due to gravity and seismic loads
on embankments. Further, their interaction with mechanically
stabilized earth reinforcement enhances their robustness in response
to extreme events like earthquakes. Advancements in numerical
simulation of geotechnical structures provide an opportunity to elevate
the state of conventional design which relies on simplistic models of
aggregate-reinforcement interaction and the dynamic performance
of the system. Experimental investigations contribute to evaluation of
dynamic properties of lightweight reinforced embankments through
small scale shake table studies and full-scale field vibration and impact
testing. This presentation introduces backgrounds in shake table studies
and simulation of an embankment containing expanded shale, and
provides practical design, filed instrumentation and testing results of a
full-scale lightweight reinforced embankment containing expanded
lightweight clay.

4PM - Campfire: Considerations in Selecting the Appropriate Lightweight
4:50 PM Fill Material for Your Project Dr. Stan Boyle, PhD, PE, D.GE and his
guests will moderate this campfire discussion with representatives
from lightweight material manufacturers and contractors. Material
properties, Engineering, (incl. geotechnical, structural, and seismic
benefits), Constructability, Construction cost, Construction schedule,
Site constraints, Sustainability, and other lightweight fill considerations
will be discussed. The objective of this panel discussion will be to provide
ideas and concepts critical for engineers, contractors, and owners to
select appropriate lightweight material(s) for their project. Discussion will
include how to leverage the particular properties of different lightweight
materials in a comprehensive, integrated total system approach for
each project.

CONCLUSION OF ABSTRACTS