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. 410 (i) Impact Resistance of the Coating: The resistance of the coated rebar to mechanical, damage shall be assessed by standard falling weight test as per the test procedure-F with an impact force of 9Nm. No shattering, cracking or bond-loss of the coating shall be observed except at the impact area. (j) Acceptance/inspection: The coated rods shall be not meet the requirements of the above specification shall be rejected. The manufacturer of the coated rebar, shall submit a certificate from an appropriate testing agency that the coated rebars meet the requirements of the specification. 14.2 QUALITY CONTROL MEASURES TO BE TAKEN AT SITE 1) The application steps are to be supervised strictly as per the specification. 2) Sand-blasting of the surface of reinforcement steel is to be done as per the surface preparation mentioned in application system. 3) Primer coat and sealing coat are to be applied by brush, or by spraying or by dipping under supervision. 4) Coating thickness of the finished bar can be checked frequently by per types alcometer. 5) The 2 V Impressed Current Test (ASTM A-775/775/5M- 90) is to be taken randomly at site laboratory (every 15 days). It is the most critical test for finished product.
CIDCO OF MAHARASHTRA LTD C.A.No.01/CIDCO/SE(KHR)/EE(KHR-I)/2010–11 Pg. No. 411 6) The coated bars bending test can be observed frequently at site. 14.3 GUIDELINES FOR HANDLING, STACKING AND TRANSPORTING OF 14.4 STACKING: COATED REINFORCING BARS The durability of the coated rebars is related to the coating quality. The more damage to the coating is more prone to corrosion. Good, job site practices can minimize the coating damage. For this reason, standards from ASTM, JSC, NACE(USA) have laid down specific procedures for stacking and transporting coated bars. Some important guidelines are referred here. i) It is preferable to store the coated bars on buffer material placed at suitable intervals instead of placing them directly on the ground. ii) It is not desirable to store coated bars by piling them on top of one another they are to be stored by piling buffer materials such as wood, rubber, jute sacks etc., should be used to separate the layers. However, the number of layers allowed shall be limited to a maximum of five. iii) The coated rods shall be stored in yard. iv) If any damage had occur during stacking it should be repaired immediately by the same coating formulation before any rusting occur.
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