Underground Construction - August 2022 - 27

mitt ees publish several Manuals of Practices
(MOPs). Additionally, we worked
with AWWA and ASTM committ ees to
develop standards for diff erent methods.
Th roughout these eff orts, we have
funded hundreds of graduate students
to complete their theses/dissertations in
pipelines, trenchless technology and underground
infrastructure. We have received
more than $2.8 M in governmental
grants and from industries for research
support. Some of our current activities are
highlighted elsewhere in this newslett er.
Obviously, all these accomplishments
could not be possible without the help
and support of our advisory board members
and friends. Th ey have contributed
their time and resources so we can bett er
serve the industry.
Research
In recent years, we have focused our research
eff orts on the development of
polymeric spray applied pipe linings
(SAPLs), which can combat the issue of
pipe aging and failures. Th is technology is
one of the most cost-eff ective and versatile
trenchless pipeline renewal methods,
due to its minimum access requirements.
SAPL is applied inside a pipe for either
corrosion prevention or to enhance
load bearing capacity of the host pipe
by creating a new interactive polymeric
pipe. CUIRE, in collaboration with various
industry partners, is testing and evaluating
the structural properties of SAPL
liner materials.
Th is testing program will classify the
polymeric SAPL for pressure and gravity
standards in pipes and culverts, as
well as industrial applications requiring
high pressure.
TABLE 1 presents the CUIRE testing
capabilities and equipment list. We have
procured various equipment to improve
our testing and material certifi cation
programs.
Please call us at (817) 272-9177,
email cuire@uta.edu or visit our website
at www.cuire.org with any questions or
comments. You can register for our upcoming
training schools at htt ps://uta.
engineering/cuireschools2023/
We would love to hear from you!
Respectfully,
Mohammad Najafi , CUIRE Director
Table 1. CUIRE Testing Capabilities and Equipment List
Test Method
Flexural Strength
(ASTM D790)
Tensile Strength
(ASTM D638)
Punch Shear
(ASTM D732)
Creep Tensile and Flexural
(Long-term properties) (ASTM D2990)
Fatigue
(ASTM D7791)
Hardness
(ASTM D2240)
Thermal Expansion
(ASTM E831)
Abrasion Resistance (Taber Abraser)
(ASTM D4060)
Adhesion (Metal-ASTM D4541
and Concrete-ASTM 7234)
Water Absorption (ASTM D570)
Glass Transition (ASTM D7426)
Fracture/ Crack Growth (ASTM F1473)
Soil Box Testing
Signifi cance
Mechanical Properties
Determine the fl exural strength of material to resist the impact
due to bending, ground movement, and any temperature changes.
Evaluate the tensile properties to resist the material stretch due to
excessive or continuous loading.
Determine the shear resistance to resist the shear impact due to
handlining and sudden load for shallow depth culverts/pipes,
and impact of any rock (if present) in the embedment.
Predict strength of material and dimensional changes under long-term
loads. Material's long-term performance extrapolated for 50 years.
Provide a guide for material selection for service under condition
of repeated fl exural stress.
Determine material harness, which is inversely related to the
penetration and is dependent on the elastic modulus and viscoelastic
behavior of the material.
Determine coeffi cient of linear thermal expansion by thermal stress
during temperature variations.
Determine abrasion damage during service life. This test evaluates
the abrasion resistance of coatings.
Evaluate the degree of bonding and determines the greatest tensile
force that a surface area can bear before bonded liner material is
detached from the host pipe.
Determine the proportion of water absorbed by liner material
due to its porosity.
Determine changes in specifi c heat capacity in linear material.
Determine the slow crack growth resistance of the liner material.
Gravity Pipes/Culverts
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 diff erential transformers (LVDTs),
cable displacement sensors (CDS), uniaxial strain gauges, earth
pressure cells, and image processing.
Parallel Plate Load
(ASTM D2412)
Ring Stiff ness
(ASTM D2412)
Determine pipe stiff ness, which is a function of pipe dimensions
and physical properties of pipe material.
Measure pipe's deformation resistance to radial forces and
pipe resistance to ring defl ection.
Creep Ratio (Constant Pressure) (ISO 9967) Provide liner defl ection over an extrapolated two-year period.
Pressure Pipes
Fatigue Full-scale Test
Short-term Hydrostatic Burst Test
(ASTM D1599)
Long-term Pipe Burst- Hydrostatic
Design Basis (HDB) (ASTM D2837)
Short-term Hole Spanning
(AWWA Structural Classifi cation)
Long-term Internal Hydrostatic Pressure
(AWWA Structural Classifi cation)
Short-term External Hydrostatic Pressure
(AWWA Structural Classifi cation)
Hydraulic Flow
Determine if liner can withstand cyclic loads that are 1.5 or 2 times
higher than its pressure class for 2 million or more cycles and predict
design service life.
Determine the burst pressure of bare liner pipe.
Determine eff ects of temperature and pressure on the life span
of liner material and long-term hoop tensile strength.
Determine hole spanning capacity of liner in pressure application.
Determine resistance of SAPL for long-term hole spanning.
Determine liner resistance to external hydrostatic pressure.
Test hydraulic fl ow characteristics of the liner material considering
diameter reduction and surface smoothness under high fl ow and
compare with fl ow characteristics of host pipe without liner.
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Underground Construction - August 2022

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