Economical in comparison of conventional sheathing ducts
Lower values of wobble co-efficient (k) & friction co-efficient (µ) than metallic ducts.
Better bonding with the concrete due to higher - close corrugations.
All required Accessories are available with us in-house.
Also available in long lengths and hence minimum joints
Easy handling & speed installation due to fewer joints
Good weathering resistance.
Corrosion monitoring of tendons is possible
Helps electrical monitoring of tendons.
Enhances fatigue life of concrete ( bridges & Flyovers )
Good impact and compression strength
High stiffness and flexibility
Joining is very easy
Even when bend cross section of ducts retains its circularity
Therefore these ducts are strongly recommended in all mega projects especially in marine climatic conditions and corrosion prone area.
It is to be noted that all over the world HDPE ducts are preferred over metallic ducts.
There is no difference in the basic prices of HDPE & Metallic Sheathing ducts.
In overall cost of the structure, approx. 10% of the total project cost is spent on prestressing work including material. The amount spent towards actual cost of sheathing duct is about 10% of the prestressing work and if HDPE ducts are costlier by few percentage over metallic, the over all cost impact is negligible.
It is also to be noted that if the lesser values of m & k in PE ducts are considered right from the designing stage, there would be substantial saving in steel.