Structural Rehabilitation by Grouting and Surface Treatment for Anjunem Irrigation Dam in Kerim, Sattari-Goa.

Drilling 75 mm dia hole in masonry/rock by diamond drilling from foundation gallery floor / from the top of the dam, vertical / inclined at required depth including flushing the hole, conveying all machinery equipment & necessary dewatering etc complete as directed by Engineer-In-charge.

Providing & injecting cementatious grout as per specification in the drilled holes at required pressure, including supplying, conveying cement, micro silica, fly ash, admixtures (Accelerator, Binder, Superplasticizer, etc), grouting machinery with packer system for stage grouting complete, as directed by Engineer-In-charge. (From dam top / from foundation gallery)

Carrying out water intake test / permiability test at any stage or depth as directed by Engineer Incharge by filling the bore hole with water at specific pressure of specified limit as and where directed by the Engineer Incharge, etc. complete.

Providing and applying suitable cementitious repair mortar of self curing, high abrasion resistant, non shrink, high strength, UV resistant, repair mortar coating on epoxy bond coat for concrete surface, fill the honey combing area etc., upto 10 mm thickness or as per the surface conditions including cleaning the concrete surface by grinding the surface by grinder machine with wire brush / diamond wheel, removing existing loose particles etc. by using grinder, wire brush, breaker machine, water jet (using other mechanical / manual means) also removing of algae fungi by special chemical of clonon. etc., complete with all leads and lifts, Material, Machinery, Labour, Scaffolding etc., as per secification and as per the directions of the Engineer-In-Charge, etc, complete.

Providing and applying rapid-setting cementitious leakage-plugging mortar for active leakages, including surface preparation, chase cutting, mixing, application into active leak passages, holding under pressure until initial set, priming with bond coat, finishing with repair mortar, complete in all respects as per relevent codal provision and direction of Engineer-in-Charge. The application shall include all labour, materials, curing and finishing necessary to complete the work.

Providing and fixing of 12 mm nozzle in the crack portion @ 500mm c/c as per the direction of the engineer in charge, complete, including cost of all materials, machinery, safety equipment, etc. necessary to complete the work as directed by the Engineer-in-charge, etc; complete.

Providing and injecting a two-component, integral crystalline waterproofing injection grout into pre-installed nozzles on concrete surface. The scope encompasses surface preparation, cracks cleaning, packers installation, pressure injecting, final nozzle sealing and all necessary labour, materials and equipment. The grout shall possess low viscosity capable of penetrating cracks up to 0.1mm to seal active water ingress (complying with ACI 212.3R). Prior to execution, grout suitability should be tested and approved strictly as per CWPRS guidelines. The assessment criteria shall include the determination of Engineering properties tested in accordance with relevant ASTM / BIS /EN standards, specifically: Viscosity (≤15 mPa.s as per ASTM D1084), Bond Strength under Tension (≥ 2.0MPa as per ASTM D4541), Bond Strength under Shear (≥ 5.0MPa as per ASTM C882) and Pot life (30-60 mins as per ASTM C881). Complete in all respects as per standard specifications and as per the directions of Engineer in-Charge.

Providing and injecting water-reactive polyurethane (PU) foam injection grout, two component type, consisting of a base and catalyst in a 5:1 ratio, into pre-installed nozzles to arrest active water leakage and fill voids, including surface preparation, packer installation, injection with appropriate equipment, and post-injection sealing of packer holes, complete in all respects as per specifications and direction of Engineer-in-Charge. The product shall be suitable for high-pressure injection in wet conditions and capable of sealing both static and active leaks completely, including all labour, materials, tools, equipment, curing, surface finishing etc.

Providing and injecting semi-rigid polyurethane (PU) resin-based injection grout, two component system comprising a low-viscosity elastic base and catalyst in the ratio of 19:8 by volume, into pre-installed nozzles to seal non moving or hairline cracks and voids in concrete, including surface preparation, installation of packers, injection using suitable equipment and post-injection sealing of ports, complete in all respects as per specifications and as per direction of Engineer in Charge. The work shall include all labour, materials, tools, equipment, curing, surface finishing etc.

Providing pointing to the exposed face of masonry using suitable crystalline repair mortar by mixing in the ratio of 4.5:1 (4.5 parts crystalline mortar : 1 part water) over epoxy bond coat. The crystalline mortar shall have compressive strength > 45 MPa and adhesive bond strength > 1.5 MPa. The work shall be carried out as per specification and the direction of the Engineer-In-Charge, including all cleaning using mechanical / manual means, labour, materials, tools, equipment, scaffolding, curing, surface finishing etc.