Rightvision
present you with a world-class plastic product
known as Cover Blocks (Chair Type, Circular Type and
Locking Type) used in place of Concrete Cover Blocks
(In RCC Construction). These blocks not only help to
keep the reinforcement bars at the specified place,
they also offer convenience of use. Cover blocks is
available in various sizes, and avoids the time
consuming procedure of casting plain cement Concrete
Cover Blocks.
The
sizes of cover are always accurate as it is made in
factory where moulds have already been designed with
higher accuracy and the final HDPE blocks are made in
injection moldings machine. In comparison to
conventional type of covers the strength of HDPE cover
blocks are much more higher and it hardly gets broken
inside cement concrete during placing of heavy steel
shutters or during using of heavy vibrators for
settling down of concrete/ compaction of concrete.
Cover
Blocks made of High Density Polyethylene (HDPE) are
approved with International Metro Civil Contractors
and are being used in New Delhi Metro Project. Also
these Cover Blocks are tested with Government Quality
Marking Center for Plastic & Rubber Goods,
Faridabad for compressive Loads and Ash Content.
After
lot of research and interaction with Government and
Private Construction Groups specification for Cover
Blocks has been fixed as follows:
·
Cover Block
must be made of High Density Polyethylene (HDPE) &
Low Density Polyethylene (LDPE)
·
Melting
Point of Cover Block should be in between 140 to 165
C.
·
Density
should be between 0.90 g/cc to 1.10 g/cc.
·
Chloride
Content (%) must not be more than than 0.100
·
Ash Content
must not be more than 1.5%
As
per IS456 : 2000 Section 12.3.2 the details for Cover
are as follows:
Section
12.3.2 Page 26
Tolerance
for Cover:
Unless
Specified otherwise, actual concrete cover should not
deviate from the required nominal cover by +10mm
Spacers,
cover blocks should be made of concrete of same
strength or PVC.
Accurate
Reinforcement Cover means right protection to the
steel Reinforcement and less Maintenance.
In
place of concrete cover blocks, High-Density Poly
Ethylene (HDPE) cover block is used because of the
main reasons:
·
Our ready
to use HDPE cover blocks (chair, circular and locking
type) is ready to use for quick installation.
·
Cover
Blocks are cost effective compared to conventional
type (considering material cost, time involvement and
labor cost).
·
Good
Bonding with Concrete.
·
Unaffected
by vibrations or tampering.
·
High
Strength.
·
Chemically
inert.
· Accurate, Precise
and Stable.