Structural Retrofitting Process and Techniques
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1 Structural Retrofitting Process and Techniques Md. Mostafizur Rahman Sr. Business Consultant Fosroc Chemicals (I) Pvt Ltd
2 Brief over view of FOSROC Construction Products Supplier with Manufacturing facilities in 30 countries and export to another 100 countries. Product Ranges Admixture Protective coating Surface treatments Grouts Waterproofing Joint Sealant Structural Repair and strengthening Concrete Adhesives Flooring Grinding Aids (Plasticisers- Ligno Sulphonates, Super Plasticisers- SNF and SMF and Hypersuper Plasticisers- PCE) Conplast and Structuro series. Epoxy, epoxy tar, polyurethane Polymer coating, epoxy tar, was based surface treatments coating. Cementitious (Conbextra GPI, GP2, HR etc.) ; Epoxy Grout. Proofex Engage, Loose laid Membranes, self adhesive and Polymer coating membrane. Polyurethane, Polysulphide, acrylic, epoxy modified FRP (Carbon, Glass); Repair Mortar, Micro Concrete Epoxy, SBR and Acrylic bonding agent including tiles adhesives Epoxy, polyurethane and Cementitous. Cement performance enhancer.
3 Steps for Structural Retrofitting Diagnosis of existing structure through NDT and DT and identify deficiencies through analysis of structures. Design of structural retrofitting scheme following standard codes of practices Execution of retrofitting work from reputed contracting house
4 Distress of Concrete owing to Fire
5 Distress of Concrete (Two-way ribbed Slab)- Fire Burnt
6 Distress owing to corrosion
7 Strengthening owing to corrosion
8 Strengthening owing to corrosion
9 Section Enlargement owing Under design
10 Section enlargement owing to U/D
11 Restoration of Concrete CONSTRAINTS: Most of the cases, as-built drawing is not readily available Sub structural drawing and Soil test reports are not available Concrete of columns is often inferior than floor slab Stressed structure to be retrofitted with the existing loading pattern
12 Restoration Methodology METHODOLOGY : Surface Preparation: Chipping off the loosely adhered damaged and carbonated concrete, Step-II Repairs with micro concrete: a) Application of anti corrosive epoxy zinccoating (Nito Zinc Primer) to re-bars. b) Anchoring Shear Connectors and Main bars using polyester resin anchor grout LOKFIX P. c) Epoxy Bonding agent (Nitobond EP) in between parent and new micro concrete. d) Core cutting on the top of the slab to facilitate pouring of Free flow Micro Concrete (Renderoc RG) for Slab/ Micro Concrete Encasement for columns/ Beams.
13 Step-1: Surface preparation and Fixing additional Rebar by LOKFIX Anchoring adhesives
14 Step-2 :Nitozinc Primer; Anti corrosion coating in case of corroded and fire damaged structure
15 Step-3 Bonding agent in between parent and Micro concrete
16 Step-4: Fixing form work and Micro Concrete encasement
17 Slab retrofitting: Concrete core cutting of Slab, bonding agent application and pouring micro concrete
18 Pouring of Micro Concrete; Renderoc RG; W/P: 0.16, Grade: M50
19 Pouring of micro Concrete and restoration
20 Pouring Micro Concrete and Restoration
21 Cabon Laminates (Nitowrap CFP 50) Installation
22 CFRP Plate installation; Nitowrap CFP 50: 1.2 mm x 50 mm x 100 M
23 Carbon Fiber Wrapping to Column bean joint
24 Carbon Fiber ; Nitowrap EP (CF)
25 Joist Installation and GAP filling in between Joist and slab
26 Basement and Footing Load bearing capacity increment- Installation of Temporary Support
27 Basement Thickness Increment
28 Footing size increment
29 THANK YOU VERY MUCH FOR YOUR NICE PATIENCE
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