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Canadian Concrete Pipe & Precast Association

   

Non-reinforced concrete pipe
a resilient pipe product for critical infrastructure

Non-reinforced concrete pipe offers the same superior qualities of strength, durability and
versatility as reinforced concrete pipe, but at a significantly lower cost.
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Ontario Concrete Pipe Association

    Just The Facts 1 The NCHRP Project 04-24 tested polyethylene pipe, including
new and installed pipe. Testing of new pipe, which was furnished to the researchers 
by Polyethylene Pipe Manufacturers, resulted in eight of fourteen samples 
failing for the stress crack resistance based on the current standard. For the 
new test procedure proposed by the Geosynthetic Research Institute, 
nine samples failed for stress crack resistance. This study showed that
current polyethylene pipe is subject to cracking. Some new pipe samples
also failed to meet current requirements such as carbon black content,
which provides U.V. protection subject to cracking under the specified
test procedures. Get all the facts. Click here.
     
    Just The Facts 2 All installed drainage systems require inspection and
installed performance testing. For flexible pipe, deflection testing using a 
properly gauged mandrel, must be undertaken to ensure the pipe 
deflection is within design limits. OPSS 410 Construction Specification 
for Pipe Sewer Installation in Open Cut states, “ Ring deflection testing 
shall be performed on all pipe sewers constructed using plastic pipe.” The 
specification also states, “The device shall be pulled manually through the 
pipe not sooner than 30 days after the completion of backfilling and 
installation of service connections.” In order to gain a true perspective on 
deflection, an additional mandrel test, prior to final assumption by the 
owner, will ensure the installation is capable of performing as intended.

Get all the facts. Click here.
     
    Manitoba Addressing Deteriorated Steel Culvert Problem Stories of motorists
having near misses from sudden culvert failures and sinkholes within our highway 
infrastructure system have increasingly gained the attention of Canadians. As
provinces already struggle to keep up with existing infrastructure that is reaching 
a 100 year service life, the premature failure of culverts that are in some cases
less than 25 years old, will continue to hinder the ability for all levels of 
government to balance their budgets. Alternative pipe materials chosen strictly
on low initial cost instead of long-term risk assessments is not only resulting in 
enormous emergency culvert replacement costs, but the unplanned closure of
a highway also poses economic losses for all users who depend on a reliable
highway system, not to mention the serious risk to public safety when these
culverts fail with little warning.

Get the entire article. Click here. 
     
    Addendum Addresses Standard of Care for Plastic Pipe A sanitary sewer project
was released for tender by the City of London in early 2013. The sanitary sewer was 
designed using reinforced concrete pipe. However, the contract also included a
trial section of 65 metres of 900mm polypropylene plastic pipe. The plastic pipe in 
question was offered free of charge by the Ohio based producer of this pipe.
There are major differences between reinforced concrete pipe and plastic pipe.
Drainage systems and sewer systems constructed from concrete pipe and plastic
pipe have to be designed differently and installed differently. The consulting
engineer for the City of London project recognized those differences and issued
a comprehensive addendum to address the design and installation of a 
relatively large plastic pipe.

Get the entire article. Click here



American Concrete Pipe Association


 
  HDPE Pipe Design and Construction: Lessons Learned from the East Texas
Fish Hatchery Incident
 In April 2009, inspectors at the John D. Parker East 
Texas Fish Hatchery discovered that sections of 60-inch and 48-inch diameter
high-density polyethylene (HDPE) drainage pipes had collapsed.
Ultimately, approximately 11,000 linear feet of 30-inch, 48-inch, and
60-inch diameter corrugated HDPE pipe were removed and replaced.
In May 2010, a Compromise and Settlement Agreement (Settlement)
was signed by the Texas Parks and Wildlife Department
(TPWD), HDR Engineering (Engineer), Allco (Contractor), and Travelers
Casualty and Surety Co. of America. Per this Settlement, the
Engineer paid $3.18 million to TPWD and $213,000 to the Contractor.
According to the Settlement, “certain issues arose regarding the
HDPE drainage pipe on the project, which issues included certain
portions of the HDPE pipe experiencing deflections beyond what
should normally be expected.”  It is noteworthy that the HDPE pipe
manufacturer was not a party to the Settlement. The Contractor and
Owner were severely delayed, and the Engineer bore all financial
liability of the Settlement.

Get the entire story. Click here. 
     
    Concerns Surface from Polypropylene Pipe Installations In some U.S. 
markets, contractors and engineers are being solicited to experiment 
using polypropylene (PP) pipe in storm water projects. Generally, 
when compared to reinforced concrete pipe (RCP) and other
flexible materials, there are very few PP storm pipe installations 
nationwide. Civil engineers and underground utility contractors know 
very little about PP storm pipe, and the history book of successful PP 
pipe performance is yet to be written. While consistent, successful 
performance of PP storm pipe remains to be proven, there are
published articles available to engineers that are interested in learning 
more about the PP storm pipe material, design, and installation 
characteristics.1 Recently, some interesting reports – stemming from 
actual installations - have emerged to raise concerns and doubts about PP pipe.

Get the entire story. Click here.
     




Canadian Concrete Pipe & Precast Association

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