Geosynthetics July/August 2024 - 34

Soil nails and shotcrete reinforcement for new roadway embankment
applying concrete using a hose and nozzle,
spraying it onto a surface. Shotcrete
can be used for a variety of applications,
including structural repair, stabilization
of slopes, lining tunnels, swimming pools
and creating architectural features.
There are two main types of shotcrete:
wet-mix and dry-mix. The Mantua
Boulevard Extension utilized wet-mix
shotcrete, where the concrete ingredients
are mixed with water before being
sprayed onto the surface. Dry-mix shotcrete
involves mixing the dry ingredients
(such as cement, aggregate and additives)
on-site, then adding water at the nozzle
during application.
Shotcrete often is preferred in situFIGURE
3 Drilling and grouting operations occurring simultaneously for proper
grouting techniques with hollow bar soil nails
ations where traditional concrete pouring
methods are impractical or laborintensive,
such as in areas with restricted
access or complex shapes. It offers rapid
placement, high strength and excellent
bond to the substrate. When combined
with mechanical elements such as soil
nails, shotcrete can be applied without
formwork and without the installation
of leveling pads often necessary for cast
in place, or pre-cast façade installations.
Shotcrete face
It was anticipated that the new MSE walls
would induce significant consolidation
settlement due to the poor underlying
soil conditions and variable water table.
The construction sequence included considerations
for the settlement to occur
prior to installation of the permanent
shotcrete façade. Once settlement was
completed, Access Limited crews completed
the installation of the northern
and southern faces with a reinforced
shotcrete application.
Shotcrete is a cementitious construcFIGURE
4 Proper hollow bar soil nail (HBSN)
grouting does generate surface returns that
should be accounted for in the overall project
construction sequence.
34
Geosynthetics | Summer 2024
tion material that is applied pneumatically,
or with compressed air, onto a
surface at high velocity. It's a method of
Robust safety protocols and
quality programs
The shotcrete work at the Mantua
Boulevard Extension was critical to
completing the project. When specifying
shotcrete, it's important to use labor certified
to the American Concrete Institute's
(ACI) nozzleman certification program,
and to ensure proper control of the work
in the project specifications by using
shotcrete-specific concreting practices
found in ACI's Standard: ACI 506.2-13
Specification for Shotcrete. Proper application
of shotcrete requires special training
to ensure adequate consolidation of
the mix and ensure rebar encapsulation.
It also involves the use of high-pressure
pumps, which are capable of causing

Geosynthetics July/August 2024

Table of Contents for the Digital Edition of Geosynthetics July/August 2024

Geosynthetics July/August 2024 - Cover1
Geosynthetics July/August 2024 - Cover2
Geosynthetics July/August 2024 - 1
Geosynthetics July/August 2024 - 2
Geosynthetics July/August 2024 - 3
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Geosynthetics July/August 2024 - Cover3
Geosynthetics July/August 2024 - Cover4
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