WBIW/SDO/TBSDIV/NIT4e/26-27/1

Dismantling of Structures Dismantling of existing structures like culverts, bridges, retaining walls and other structure comprising of masonry, cement concrete, wood work, steel work, including T&P and scaffolding wherever necessary, sorting the dismantled material, disposal of unserviceable material and stacking the serviceable material with all lifts and lead of 1000 metres (Reference to MORT&H's specification clause 202) (i) By Mechanical Means (a) Prestressed / reinforced cement concrete grade M-20 & above

Cleaning the concrete surface by removing dirt and debris, marking defective locations and removing loose concrete by careful stripping untill hard surface is exposed, cutting the concrete to regular shape, wire brushing the exposed surface and removing debris from site complete as per direction of the Engineer - in - Charge.

Supplying, binding, fixing etc. including initial straightening, cutting to requisite length, hooking and bending to correct shape, placing in proper postion of uncoated HYSD reinforcement bar in super-structure complete as per drawing and technical specifications (Reference to MORT&H's specification 1600) .

Epoxy bonding of new concrete to old concrete ( crack/spalling shall be sealed with epoxy injection/grouting coating of epoxy resin @ 0.80kg /sqm should be applied )(Reference to MORT&H's specification 2805).

Supplying. preparing and placement of ready mix non shrink cementious microconcrete having no metalic aggregate or chlorides for repairing and jackting of damaged R.C.C.members. The micro concrete should achieve a compressive strength not less than 10 MPa after 24 hours. 40 Mpa after 7 days and 50 Mpa aftre 28 days at 300C.It should have unrestrained expansion in between 1 to 4%. flexural strength shall not be less than 5MPaafter 28 days. Micro concrete should have a co-efficient of thermal expansion similar to that of the host concrete.