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

91 Dy. Executive Engineer
SPECIFICATION FOR ANTICORROSIVE TREATMENT TO MILD/TOR STEEL BAR
REINFORCEMENT CODE OF PRACTICE FOR CORROSION PROTECTION OF REINFORCING
STEEL USING CEMENT - POLYMER COMPOSITE COATING SYSTEM FOREWORD
0.1 This standard covers the code of practice for corrosion protection of reinforcing steel using
cement polymer composite coating system. In this preparation assistance has been derived
from the following.
(A) ASTM A775 / A775M -94d Standard specification for Epoxy coated reinforcing steel
bars.
(B) Test methods specified by Central Electrochemical Research Institute Karaikudi -
630006.
0.2 This practice covers the various test procedures required to ensure the quality of coated
product.
1. SCOPE
This specification covers the code of practice for cement-polymer composite coating system which
will be applicable to reinforcing bars conforming to :
BIS 432 (Part 1) 1982 - Specification for mild steel and medium tensile steel bars and hard drawn
steel wire for concrete reinforcement - Part 1 Mild steel and Medium Tensile steel bars.
BIS 432 (Part 2) 1982 - Specification for mild steel and medium tensile steel bars and hard drawn
steel wire for concrete reinforcement - Part 2 Hard Drawn steel.
BIS 1139 (Part 1) 1966 - Specification for hot rolled mild steel and medium tensile steel and high yield
strength deformed bars for concrete reinforcement.
This standard specifies the recommended practice for surface preparation, method of application,
testing, inspection, handling and stacking of coated reinforcing bars.
2. SURFACE PREPARATION
2.1 Prior to blast cleaning visible deposits of oil, grease or paint shall be removed by suitable
alkaline cleaner ( soak cleaning compound ) as per SSPC - SPCOM, clause 11.1.2
2.2 The surface of the steel reinforcing bars to be cleaned by abrasive blast cleaning using either
sand or grit to the near white metal finish in accordance with SSPC - SP 10 - / NACE
No.2.1994.
2.3 The prepared surface shall meet the visual standards of comparisons as in SSPC - VIS 2
2.4 As per SSPC - VIS 2. The cleaned surface shall conform to the rust grading scale 9-10 ( i.e.
% of area rusted 0.03 % ). 0.2-1994.
3. APPLICATION OF COATING
3.1 The application of the coating shall not be unduly delayed and commence immediately after
completion of surface preparation.
3.2 The coating shall be applied by an appropriate method and fully cured in accordance with the
recommendations of the supplier of the coating material.
3.3 It is advisable that severely rusted and heavily pitted reinforcements are not accepted for
treatment.
4. REQUIREMENTS OF THE COATED RODS
Cement polymer coated rods shall meet the following requirements;
4.1 Uniformity of the coating.
The coated rod when visually examined shall be fairly uniform in thickness and shall be
devoid of any defects such as cracks peeling, bulging etc. No surface area shall be left
uncoated. No rust spots shall be visible with the unaided eye before embedding in concrete.
4.2 Thickness of the coating.
4.2. a) After curing, the minimum dry film thickness of the coated rods shall not be less than 125
microns.
Signature of Contractor No. Of Corrections Executive Engineer