Underground Infrastructure - August 2023 - 24

CURRENTLY @ CUIRE
dition and the suggested liner classification
design, according to the AWWA
structural classification.
Testing, certification
for polymeric SAPL
Polymeric lining system testing can be
categorized into three types:
* material properties testing
* gravity pipes full-scale
laboratory testing
* pressure pipes short-term and
long-term full-scale laboratory testing
Material properties testing is required
to determine the mechanical properties
of the material, which can be useful in
designing the liner material for its application
in different host pipe and environmental
conditions. Material properties
of the liner are required to design lining
systems both in gravity and pressure
pipes. TABLE 3 presents the suggested
material properties tests for the polymeric
material, along with their significance
in the lining system application.
TABLE 3 includes both short- and
long-term material testing. Material
testing such as flexural, tensile and
punch shear tests are commonly performed
on the polymeric material to deTABLE
4 - Full-scale Laboratory Testing for Polymeric SAPL Applications in Gravity Pipelines
and Culverts
Test Method
Soil Box Testing
Significance
Simulate structural capacity of liner to renew the old and deteriorated gravity
pipes and culverts in trench conditions using a 330-kip MTS actuator, data
loggers, linear variable differential transformers (LVDTs), cable displacement
sensors (CDS), uniaxial strain gauges, earth pressure cells, and image processing.
Parallel Plate Load
(ASTM D2412)
Ring Stiffness
(ASTM D2412)
Creep Ratio (Constant Pressure)
(ISO 9967)
Determine liner pipe sample stiffness, which is a function of the liner material's
dimensions and physical properties.
Measure the liner pipe sample's deformation resistance to radial forces and
resistance to ring deflection.
Provide liner pipe sample deflection over an extrapolated two-year period.
Test Method
TABLE 5 - Full-scale Laboratory Testing for Polymeric SAPL Applications in Pressure Pipelines
Significance
Short-Term Testing
Hole Spanning
(AWWA Structural Classification)
External Hydrostatic Pressure
(AWWA Structural Classification)
Hydrostatic Burst Test
(ASTM D1599)
Vacuum Pressure Test
Hydraulic Flow Test
Long-Term Testing
Fatigue Full-scale Test
Hole Spanning Internal
Hydrostatic Pressure
(AWWA Structural Classification)
Pipe Burst- Hydrostatic Design
Basis (HDB) (ASTM D2837)
Fatigue Full-scale
Laboratory Test
Determine hole spanning capacity of liner in pressure application.
Determine liner resistance to external hydrostatic pressure.
Determine the burst pressure of liner pipe samples. Useful in calculating the
short-term hoop strength of liner material.
Determine liner resistance and adhesion strength to negative pressure and
maintain the liner integrity to host pipe in case of negative pressure.
Evaluate the hydraulic flow characteristics of the liner material in comparison
with the host pipe without liner, considering diameter reduction and surface
smoothness under high flow.
Determine if liner can withstand cyclic loads that are 1.5 or 2 times higher than its
pressure class for two million or more cycles and to predict design service life.
Determine resistance of liner for long-term hole spanning.
Determine effects of temperature and pressure on the life span of liner material
and long-term hoop tensile strength.
Determine if liner can withstand cyclic loads that are 1.5 or 2 times higher than
its pressure class for two million or more cycles and predict design service life.
24 AUGUST 2023 | UndergroundInfrastructure.com
termine the tensile and flexural strength
and modulus of elasticity.
In addition, the long-term creep
properties of the material, both tensile
and flexural, are important to determine
the material behavior under long-term
loads, which are required for semi-structural
and structural design of liner systems
for pressure and gravity pipelines.
Full-scale laboratory testing: gravity
pipelines and culverts methods are represented
in TABLE 4 represents the fullscale
laboratory test methods for gravity
pipeline applications.
CUIRE has performed full-scale
laboratory soil box testing on lined and
unlined corrugated metal pipes and investigated
the structural integrity of the
liner. In addition, the parallel plate test
is recommended to determine the pipe
stiffness
and
deformation
resistance
against radial forces and ring deflection.
The creep ratio test will be useful to determine
the long-term deflection of liner
over time under constant pressure.
Full-scale laboratory testing: pressure
pipelines - TABLE 5 presents the full-scale
laboratory test methods for pressure
pipeline applications. The recommended
testing is categorized into two types:
short-term and long-term.
Many researchers have been working
on the testing and certification of the liner
material in pressure pipes application for
different structural classifications. However,
the liner has been certified up to Class
III in pressure pipes application, and the
Class IV certification is still in progress.
Short-term full-scale
laboratory testing
TABLE 5 presents suggested tests that
can be performed on SAPLs to certify
and classify them as Class II, III, or IV
and use it to renew the pressure pipelines.
Short-term testing determines the
resistance of a liner in a short time span.
Short-term hole spanning testing
was performed by CUIRE for a 30-inch
diameter host pipe with hole-spanning
sizes of 0.5, 1, 2, 4, and 6 inches. The pipe
samples with 0.5-, 1- and 2-inch hole
spanning sizes were lined with pure poly

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