B-1 AGREEMENT System Generated e-Tender No ... - e-Tendering

93 Dy. Executive Engineer
6. PROCEDURE FOR HANDLING, STACKING & TRANSPORTING OF COATED
REINFORCING BARS
The durability of the coated rebars is related to the coating quality. The more damage is to the
coating, it is more prone to corrosion. Good jobs site practices can minimise the coating
damage. For this reason, standards, such as ASTM, JSCE, NACE (USA) have laid down
specific procedures for stacking and transporting coated bars. Some important guidelines are
referred here.
6.1 Stacking:
6.1 a) It is preferable to store the coated bars on buffer material placed at suitable intervals instead
of placing them directly on the ground.
6.1 b) It is nor desirable to store coated bars by piling them on top of one another. If they are to be
stored by piling, buffer materials such as wood, rubber, jute sack etc. , should be used to
separate the layers. However, the number of layers allowed shall be limited to a maximum of
five.
6.1 c) The coated rods shall be stored in an enclosed yard.
6.1 d) If any damage had accured during stacking it should be repaired immediately before any
rusting could occur by using the same coating formulation.
6.2 Handling and Transporting
6.2.a) The coated bars shall be securely bound together using a buffer material (Padding) and it
is desirable that the best bars shall be supplied with some canvas cover.
6.2.b) When loading and unloading bundles of coated bars, it shall be preferable to lift them, with a
strong back, spreader bar multiple supports etc. To avoid extreme bending, nylon slings at 2
or 3 points shall be used.
7. SPECIFICATIONS FOR PATCH REPAIRING OF COATING DAMAGES.
7.1 Coating repair is required when peeling off and other damages accur during fabrication or
handling.
7.2 The patch repair shall be done at site using the same coating material as per the
manufacturer’s recommendations.
7.3 It is essential to ensure a minimum coating thickness of 150 microns at all the repaired
portions before embedding in concrete.
REFERENCE DOCUMENTS.
1. ASTM G8 -90 Standard test methods for cathodic disbonding of pipeline coatings (Method A)
2. ASTM G20-88 Standard test method for chemical resistance of pipeline coating.
3. ASTM G12-83 Standard test method for non-destructive measurement of film thickness of
pipeline coating on steel.
4. ASTM D-4060-90 Standard test method for abrasion resistance of organic coating by the
Taber Abraser.
5. ASTM -G14-88 Standard test method for impact resistance of pipeline coating (fallingweight
test)
6. BIS-2770 Part-I-1967 Method of testing bond in Reinforced Concrete part 1 Pullout Test
(1967)
7. SSPC-SP 10-NACE No.2 1994 Near White Blast Cleaning.
8. SSPC-VIS 2 Guide to standard method of evaluating degree of rusting on painted steel
surfaces.
9. SSPC-SP-COM - Surface Preparation Specifications.
Signature of Contractor No. Of Corrections Executive Engineer