Page 10 - LWFC Catalog

PRESENTATION ABSTRACTS
PRESENTATION ABSTRACTS

11:00AM - Sustainable Geotechnical Engineering for Highway and Transit
11:40AM Projects – A Systems Approach This presentation will present exam-
ples of sustainable geotechnical engineering applied in heavy civ-
il highway and transit projects. The examples will include examples
where geosynthetics, lightweight fill, ground improvement, vegetation,
re-use of existing foundations, and re-usable temporary soil nails were
employed to create sustainable, constructible, and cost-effective engi-
neering solutions. The necessity of taking a Systems Approach to devel-
Tuesday op sustainable solutions will be discussed. A systems approach includes

October thinking not just from the perspective of a particular expertise, e.g.,
geotechnical engineering, but considering the bigger picture of the
19 overall project: civil, structural, hydraulics engineering; traffic impacts;
constructability and construction methods; and post-construction op-
erations and maintenance.

1PM - A Framework for Lightweight Fill Selection Lightweight fill is a unique
1:50PM ground modification technology because it is one of the few ground
modification technologies that involves decreasing the loads imposed
by an earth structure to the foundation soil instead of altering the site
foundation conditions that most other ground modification technologies
apply. If lightweight fill is selected as a potential ground modification
technology on a project, the next key challenge is to select potential
lightweight fill types to further evaluate so that an alternative analysis
can be performed for selection of the best lightweight fill for use on a
project. Selection of suitable lightweight fill types is a challenge because
there are many types of lightweight fills that have been utilized in civil
engineering applications such as pumice, scoria, expanded shale/
clay, slag, foamed glass, cellular concrete, fly ash, geofoam, shredded
tire, and wood fiber. These various lightweight fill types possess diverse
material properties and construction considerations that make selection
of a favorable type challenging. These lightweight fills can serve various
functions on a project such as conventional lightweight fill, thermal
insulation, compressible inclusion, damping, low earth pressure fill for
retaining structures, and structural support. This presentation suggests a
framework for lightweight fill selection that is based on the design-by-
function approach that is typically used in selection of geosynthetics.
The design-by-function approach involves assessing the primary
function that the lightweight fill will serve and then calculating the
required numerical value of a property for that function.

2PM - State of the Practice for Application of Lightweight Cellular
2:50 PM Concrete in Geotechnical Engineering Lightweight cellular concrete
(LCC) also known as Low Density Cellular Concrete or foam concrete or
grout has been economically used for various engineering applications
such as below grade fill and embankment fill. LCC is defined as concrete
made with hydraulic cement, water, and preformed foam to form a
hardened material having a oven-dry density of 50 pcf (800 kg/m3) or
less. Although lightweight cellular concrete has been applied in various
engineering projects since almost a century ago, extensive use of LCC
in civil, geotechnical or construction engineering projects has only been
observed in the past few decades. There are very limited published
design guidelines available on LCC applications such as engineered