Tenders are hereby invited for the following: Repair wiggins concrete structures (pulsators & filters) using wall thickening jacketing method & Sika methodology. Scope: Concrete Repair Proposal: a) Visually inspect and hammer test the entire concrete surface to identify and mark out defected concrete spalling; b) Cut a 10mm slot the defected concrete spalling and break out concrete to expose all corroded rebar, break 20-25mm behind corroded rebar; c) Where necessary replace rebar as a rule of thumb, replace rebar where 10% of cross section has been lost. Guidance must be given from structural engineering; d) Remove all corrosion from rebar mechanically by means of grit blasting; e) We propose two repair systems: Hand pack repair method using Sika MonoTop 1010 anti-corrosive coating and bonding agent and Sika MonoTop 412NFG repair mortar that can be hand applied and wet sprayed. Shutter and pour method using SikaTop Armatec; f) EpoCem anti-corrosive coating and bonding agent and Sikacrete 214 structural micro concrete; g) Cracks to sealed with Sikadur 31DW and Sikadur 52ZA low viscosity epoxy resin; h) Reseal expansion joints using Sika Primer 3N and Sikaflex PRO3i-cure; i) Apply Sika Ferrogard 903 Plus corrosion inhibitor in 2-3 coats depending porosity of the concrete surface at a total consumption of 0.5Lt/m²; j) Apply Sikalastic 152 polymer protective coating resistant against chlorides and carbonation ingress, the Sikalastic 152 must be applied at 2mm thick. (投標 №96013353cn)