particular specifications (road works) - CIDCO Maharashtra Ltd.

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CIDCO OF MAHARASHTRA LTD C.A.No.01/CIDCO/SE(KHR)/EE(KHR-I)/2010–11 Pg. No. 414 14.9 SPECIFICATION FOR THE COATED REBARS Specifications: 1) Bond strength Name of process Cement-polymer composite coating system for the corrosion protection of reinforcing and prestressing steels. (The bend strength of the coated rebar in 7 days cured M20 concrete). 2) Flexibility of the coating (The flexibility of the coated rebar under mandrel test). : 1.2 N/mm² : Not affected 3) Thickness of the coating : 150 + 25 Microns 4) Hardness of the coating (Pencil Hardness) : Passed 7 H 5) Salt spray test : Passed 1000 Hrs. 6) Impressed voltage test : Passed 1 hour critical test. 7) Resistance to sulphate : 10,000 PPM. 8) Resistance to chloride (by anodic polarisation test) : 10,000 PPM. 9) Shelf life of the coated bars : 6 months
CIDCO OF MAHARASHTRA LTD C.A.No.01/CIDCO/SE(KHR)/EE(KHR-I)/2010–11 Pg. No. 415 10) Resistance to UV Rays (As per ASTM D 4060/84) using CS10 wheel 1 kg. load for 1000 cycles. 11) Stress corrosion cracking test (As per FIP 200 hrs. test in 20% NH4CN solution) 14.10 Tests for CPCC: 14.10.1 Test procedure A: : Weight loss 70mg Allowable weight –loss 100mg : Passes Determination of Adhesion of the Coating: Adhesion of the coating is to be tested as per ASTM A775/775 M 94 d. 10mm dia coated rods of length 1m shall be used in this test. The coated rods shall be padded with sponge and bent to 180 0 around a 75mm diameter mandrel. The bending shall be done at an uniform rate and not suddenly. No cracking of the coating shall be visible to the unaided eye on the outside radius of the bar. If the test is to be conducted on other than 10mm diameter rod, then the diameter of the mandrel has to be changed accordingly as tabulated below. 14.10.2 Test Procedure B: Diameter of the Rod (mm) Diameter of the mandrel (mm) 8mm and 10mm 75 Applied Voltage Test: 16 100 25 200 32 250 Two identical coated bars of same size and length shall be used in the test. 14mm gauge copper wire shall be soldered on soldered on the
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