Underground Construction - January 2022 - 40
CAPITAL GROUTING VS INJECTION
PRE-REHABILITATION GROUTING -
WHAT IS THE DIFFERENCE?
By NASSCO Member and ICGC Chair John Manijak, Michels
NASSCO's Infiltration Control Grouting
Committee (ICGC) released two new sewer
specifications, replacing the 2014 Suggested
Standard Specification for Pressure Testing
and Grouting of Sewer Joints, Laterals, and
Lateral Connections Using the Packer Method
with Solution Grouts. Shortly after its release
seven years ago, the suggested standards for
grouting quickly became the choice document
for engineers and municipalities who wished
to include grouting in their projects. Used
as a basis to standardize the execution of
testing and sealing mainline and lateral joints,
and their mainline intersections through the
packer injection method across the industry,
the specification provided direction as to the
calculation of the gel times to be used, how to
address pipe preparation, quality control for the
final product, and a description of typical bid
items.
The traditional practices as described in the
2014 document focused grouting efforts on
reducing the infiltration within the pipeline
and sealing pipe joints that had failed the
joint test criteria and/or sealing the annular
space between liners and host pipes at
lateral connections. By placing a minimum
amount of grout in the gasket space and
immediately outside the defect, it produced the
desired decrease in infiltration by forming an
impermeable seal called a grout/soil matrix on
the exterior or into the annular space.
Many of those involved in the original writing of
the 2014 document remained active in ICGC
efforts over the past seven years to define the
difference between grouting methods to aid in
the installation of other rehabilitation products,
and the use of grouting for the purpose of longterm
infiltration elimination and pipe stabilization.
This resulted in the offering of two separate
specifications, one for Pre-Rehabilitation
Grouting and a second for what is now known
as Capital Grouting.
Early in the discussions of the new specs, it was
determined that to differentiate between the two
distinct methods, testing would be needed to
truly define the proper grouting means for either
situation. Through the efforts of ICGC, an above
ground, full-scale model of a sewer trench and
pipe defects was constructed which allowed for
the observation of injection behaviors and the
ensuing grout formations in different bedding
materials using various gel times. These
findings provided the physical evidence of the
ability of grout to create a pipe cradle within
the sewer trench, supporting and providing
pipe stabilization while effectively sealing the
defects. ICGC plans to release the data and
subsequent analysis of the Test Cell studies in a
full whitepaper in early 2022.
Underground Construction - January 2022
Table of Contents for the Digital Edition of Underground Construction - January 2022
Contents
Underground Construction - January 2022 - Cover1
Underground Construction - January 2022 - Cover2
Underground Construction - January 2022 - Contents
Underground Construction - January 2022 - 4
Underground Construction - January 2022 - 5
Underground Construction - January 2022 - 6
Underground Construction - January 2022 - 7
Underground Construction - January 2022 - 8
Underground Construction - January 2022 - 9
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Underground Construction - January 2022 - 40
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Underground Construction - January 2022 - Cover3
Underground Construction - January 2022 - Cover4
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