Canadian Concrete Pipe & Precast Association


Ontario Concrete Pipe Association

    Just The Facts - Concrete Pipe vs. HDPE A recent NCHRP Study indicated stress
cracks and liner tears occur in HDPE pipe with time. The cracks generally occur
at the junction where the liner is welded to the outer corrugations. The main cause
of the cracks is a combination of residual stresses built into the pipe from the
manufacturing process and stresses induced by poor installation and changing soil
conditions. This research has shown that the lack of stress crack resistance of the
polyethylene resin used to manufacture HDPE pipe leads to this long term problem.
The raw materials used to manufacture HDPE pipe can be tested for Environmental
Stress Crack Resistance (ESCR), but many HDPE pipe manufacturers do not choose
to do so. There is no established method of repairing a torn or cracked HDPE pipe.

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    Just The Facts - Concrete Pipe vs. CSP In considering the durability of corrugated 
steel pipe, the designer must address the corrosive and abrasive potential of the
installation. Abrasion is a result of prolonged exposure to coarse materials passing
over the metal surface. Eventually, the abrasion leads to the removal of the protective
coatings, thereby permitting corrosion to occur. Corrosion of metal is defined
as an electro-chemical process, initiated on the surface of the pipe, and propagates
through the movement of electrical currents causing metal ions to go into solution.
This results in a loss of metallic material from the pipe. Abrasion and corrosion
must be considered during the design phase as these characteristics present severe
limitations to the service life of corrugated metal pipe.

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American Concrete Pipe Association

    Underground Storm Water Detention & Retention Systems
Underground storm water detention and retention systems are popular
items on construction sites. Regardless of the necessary volume, the
structural strength requirements, or the need for special fittings,
precast concrete is the solution.

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Canadian Concrete Pipe & Precast Association

447 Frederick St, Second Floor, Kitchener, Ontario N2H 2P4  CANADA
T: 519-489-4488  F: 519-578-6060