SprayWall® Defines Infrastructure Rehabilitation Strength:
UTA SAPL Study
Structural Design Methodology for Spray Applied Pipe Liners in Gravity Storm Water Conveyance Conduits, University of Texas at Arlington
There was no standard design/testing methodology for spray applied pipe liners. SprayWall® was chosen to help create them.
SprayWall®’s Performance Results:
SprayWall® was an effective method of structural rehabilitation, increasing pipe strength and reducing operating times.
SprayWall®’s performance helped to develop testing and application standards for spray applied pipe liners in DOT markets across the U.S.
SprayWall® was recently featured in an industry-defining academic study that proves what we’ve known about SprayWall® for decades: it truly makes infrastructure stronger.
SprayWall® was chosen by the University of Texas at Arlington in a 2020 study to create testing and application standards for spray applied pipe rehabilitation liners in Department of Transportation markets.
The Testing Process/Methodology
Previously, there was no standard structural design methodology for spray applied pipe liners.
This study aimed to create:
- A design methodology for spray applied pipe liners used for structural rehabilitation of gravity storm water conveyance conduits
- A structural design lab testing method for pipes that were treated using spray applied pipe liners
- An accelerated lab methodology to test liner durability
SprayWall® was the only polymeric material to participate in this innovative test. The other test material was a cementitious spray applied liner.
Both were applied to invert-less corrugated metal pipe culverts that were put through stringent ring compression testing in the UTA’s Civil Engineering Lab’s Soil Prism Test Bed.
The invert-less corrugated metal pipe culverts were designed to simulate deteriorated pipes that failed at the invert, where ring compression forces are the strongest. The compression forces would show how well each liner would perform in realistic underground conditions.
The results speak for themselves.
SprayWall® makes infrastructure stronger.
The control pipe, with no spray applied treatment, was not able to resist the applied pressure from the test on its own. When treated with SprayWall®, the pipe’s load-carrying capacity was increased by 471.7% at 250 mils of application, 484.8% at 500 mils of application, and 802.7% at 1000 mils of application.
So, when a deteriorated pipe is at risk of failing, SprayWall® can make its load-bearing capacity up to 8 times stronger.
SprayWall® was the better option, in multiple facets.
SprayWall® was approximately four times stronger than the cementitious mixture when it came to ring compression forces, and cured much faster.
Additionally, the cementitious liner required filling in the corrugations of the test pipes in order for it to work properly. SprayWall® could be applied directly onto the conduits without filling the gaps, potentially saving construction crews a lot of time in the field.
As stated in the report:
“…Since the polymeric SAPL did not crack at the invert-cut location, even at the ultimate loading stage, it can be concluded that the polymeric liner was structurally capable to perform as a new pipe inside the host pipe (i.e., pipe-in pipe) and could solely resist the applied ring compression.”
SprayWall® was so effective that it was deemed structurally capable to function as its own pipe inside of the unit being tested.
SprayWall® met AND exceeded AASHTO’s LRFD (bridge) strict design requirements, widely accepted in the United States Department of Transportation market, especially as a prerequisite for acceptance into state DOT’s culvert rehabilitation programs.
With a service life of over 50 years, these results will hold up for decades to come.
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