Page 36 - TT Magazine Feb-Mar 2019
P. 36

INFRASTRUCTURE






























                                            M/s. Maurer AG, Germany in accordance   of  another  metal  to  protect  against
                                            with the design finalized and approved by   corrosion, heat, traction, etc. Aluminum
                                            Ramboll / RITES.                        (Al) provides excellent corrosion

                                            Corrosion Protection Measures           resistance properties..
                                                                                 •  For the Exterior of Bottom Chord,
                                              The superstructure of the Bridge has   Bottom Joint & Bottom Cross Girder,
                                            been constructed using a special grade   Hot zinc spray has been carried out as
                                            copper-bearing steel plates in order to   a primer then Epoxy with MIO & TIO2
                                            reduce corrosion. The average annual    coating on it and Aliphatic Polyurethane
                                            relative humidity in Bogibeel is 90% which   coating has been carried out on the top
                                            goes up to 96% to 97%. To further reduce   of it.
                                            corrosions due to the excessive humidity,
                                            a complex Corrosion Protection System   •  For Surfaces in contact with concrete
                                            specific to different components of the   that is the Top Chord and Top Joint,
                                            bridge has been implemented during the   Metal Spray Zinc Coating of 80uM has
                                            construction of the bridge.             been carried out.
                                            •  Metal Spraying – Aluminum: Thermal   •  For Exterior of Top Chord, Top Joint,
                                               Spray, basically known as Metallizing;   Top  Cross  Girders  and  Diagonals  a
                                               is a process in which metal is melted   primer of Inorganic Zinc Silicate having
                                               and directly sprayed onto the surface   an intermediate coat of Epoxy with MIO
                                                                                    and a top coat of Aliphatic Polyurethane
                                                                                    has been carried out.
                                                                                 •  For Interior of Bottom Chord, Bottom
                                                                                    Joint, Top Chord, Top Joint, Top Cross
                                                                                    Girder and Diagonals, a primer of zinc-
                                                                                    rich epoxy having an intermediate coat
                                                                                    of PVC with MIO and a top coat of
                                                                                    Water-based Polyurethane was applied.
                                                                                 •  And for Surface with concrete that is
                                                                                    Top Cross Girder a final coat of Metal
                                                                                    Spray Aluminum Coating was done
                                                                                    again to  ensure  complete corrosion
                                                                                    protection.
                                                                                 •  Hot Dip Galvanizing: It is the process
                                                                                    of coating iron & steel with zinc, which
                                                                                    alloys with the surface of the base




            36  February - March ’19 / TrafficInfraTech                                                 www.trafficinfratech-com-500653.hostingersite.com
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