Page 24 - LWFC Catalog

are areas requiring additional support usually with grouted rock bolts
and timber cribs. Openings are also maintained by cutting down failing
ground to a higher seam. This thins the salt cover and increases the
risk of brine inflow from overlying limestones. An early experiment using
steel arched supports and a low density foamed cement fill to cope
with the continuous entry closure and confine detaching rock without
deforming the arches is described.

1PM - Exploring the Potential: Permeable Cellular Concrete Designed
Thursday 1:50PM for Pollutant Removal Better living through chemistry has produced
incalculable good and many new products and societal advancements,
October however in many locations this good has resulted in substantial
pollution. Just look at the news over the past few years, massive heavy
21 metal spills at the Gold King mine, fly ash pond failure in the Tennessee
Valley, potential red mud failure in Florida, and PFAS contamination
throughout military installations across the US, amongst incalculable
others. Permeable Low Density Cellular Concrete (PLDCC) presents
an interesting technique to help address the myriad of environmental
challenges. It is comprised of cement, which is effectively a limestone
base and excellent inorganic glue, it’s hydraulic conductivity can
be modified through mixture proportions as needed, it can entrain
a variety of beneficial components for pollutant removal, and if
needed can allow easy recovery of valuable rare earth elements after
exhaustion. This presentation will present the supporting research behind
PLDCC pollutant removal and present a variety of areas where future
application many be appropriate. Attendees will understand the basics
of mixture proportioning as related to pollutant removal performance
and how particular designs could be applied for environmental
cleanup. We use water filters for our homes, why not apply water filters
for our environment?

1PM - Filling in the Ramp: Backfilling a Construction Access Ramp with
1:50PM Cellular Concrete The future home of the Seattle Kraken NHL team at
the Climate Pledge Arena located in Seattle Washington started with
the renovation of the existing at grade 1962 World’s Fair exhibit which
will now be transformed into a modern 900,000 square ft, 17,000 seat
arena with all modern amenities. The existing shallow bowl of the original
arena was excavated 60 ft. below grade to provide additional seating,
event space, parking and mechanical rooms for the new arena. This
excavation was completed while the original iconic concrete roof in
place and supported on temporary underpinning that hindered a lot of
conventional construction methods. To facilitate construction activities,
a 400 foot long construction access ramp was excavated outside of
the perimeter wall, braced with a complex system of cross lot bracing
and temporary tiebacks. The wall of the arena on this ramp side was
constructed free standing to be backfilled at the end of the project.
Since arenas have no interior floor plates, the wall was unbraced from
either side. To complete the arena, the ramp was to be backfilled and
the arena wall was to be completed with the infill “closure wall system”.
Initially the ramp closure system was designed using structural fill placed
in compacted lifts and series of tierods either tied to concrete deadman
blocks of tied to the exiting soldier piles on the far side of the ramp.
Due to the complex nature of the existing bracing, proposed snorkel
structure built around and