Page 26 - LWFC Catalog

2PM - Laboratory Testing of LDCC for Characterization of Material
2:50 PM Properties Laboratory testing has been performed on a set of light-
weight cellular concrete (LWCC) using conventional geotechnical
testing equipment with various modifications. Laboratory testing methods
include uniaxial compressive strength as a function of time and setup,
saturated fluid flow, moisture-suction behavior, and triaxial compression
as a function of degree of saturation. Testing protocols have been
explored with various results which are presented. Recommendations
on testing protocol and future work are also presented.
Thursday 2PM - Using Low-Density Cellular-Concrete Fill to Mitigate Foundation

October 2:50 PM Settlement and Accelerate Construction Schedule: McLeod Rd
Solid-Waste Transfer Station, Orange County, Florida - A Case
21 Study The McLeod Road Transfer Station is a state-of-the-art, municipal-
solid-waste-transfer facility. Its central feature is a 38,500-square-foot,
solid-waste-transfer building with a 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
a few days to about eight months, depending on location. This facility
is a critical component of Orange County’s solid-waste-management
operations, so its construction schedule was compressed to 12 months,
with incentives for early completion and penalties for late delivery. Fill
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.

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