Repair of cracks using injection grouting in the Crest, Longitudinal and Aeration Galleries of Spillway Civil Structure at RSD-Project

Grinding the surface using electric grinders to remove the dust laitance, any old treatment to reach the original crack or construction joint and to expose any hidden crack to the satisfaction of the Engineer-in-Charge.

Cutting of cracks or construction joints on surface in V shaped groove and to be repaired using fast-setting epoxy putty having Density (EN ISO 2811-1) 1.50 + 0.1 g/cm3, mixing ratio (A:B) 1:1, Pot life (ISO 9514) 40 + 10 minutes, Compressive strength (ASTM C579) 60 Mpa after 1 day, 65 Mpa after 7 days, Pull-off strength (ASTMD4541) = 2 Mpa. to the satisfaction of the Engineer-in-Charge.

Providing & fixing of NRV packers having diametre upto 14 mm to reasonable depth to ensure effective anchorage of packers making it completely air-tight for Injection process at a spacing not more than 250 mm c/c including drilling of holes, fixing packers, removing packers after injection, grinding etc complete in all respects to the satisfaction of the Engineer-in-Charge.

Supplying and Injecting High Strength Polyurethane (PU) Grout For wet cracks based on a polyol component (part A) and a polymeric MDI (part B). When mixed, a hydrophobic polyurethane with high strength is formed which is tough, rigid and resistant to a wide range of chemicals hydrophobic in nature. It bears following properties: Pot life 45-50 min, setting time 60-80 min, Compressive strength (ASTM C 109-2021) > 65 Mpa, Tensile strength (ASTM C 307) > 18 Mpa, Flexural strength (ISO 178) > 29 Mpa. Injection of PU grout under controlled pressure using specialized pump in all respects to the satisfaction of the Engineer in Charge.

Supplying and injecting low viscosity non shrinkable Epoxy Resin having following properties: compressive strength of 1 Day >70 MPa and a compressive strength of >90 Mpa in 7 days using appropriate Grout Pump until refusal, including multiple stages if required for injecting complete in all respects to the satisfaction of the Engineer-in charge.

Supplying and application of 45HB Dual Shrinkage Compensated, Fiber based Cementitious repair mortar, density (Kg/m3) 2200, Compressive strength (ASTM C 109 using 70mm cube) 28 Days = 50 Mpa. It will be used wherever patch repair is used.