This specification outlines the requirements for providing and supplying Reinforced Cement Concrete (RCC) pipes manufactured using sulphate resisting cement, conforming to relevant Indian Standards (ISI). The scope includes the supply of pipes in standard lengths, of specified class and diameter, suitable for either collar joints or rubber joints. This supply encompasses all associated costs including taxes, insurance, transportation, loading, unloading, conveyance, storing, and stacking at the designated site.
1. General Requirements:
1.1. Scope of Work: This specification covers the manufacture, testing, supply, transportation, delivery, unloading, handling, storing, and stacking of ISI standard RCC pipes made with sulphate resisting cement, of specified classes and diameters as detailed in the Schedule of Quantities/Bill of Quantities (BOQ).
1.2. Applicable Standards: All RCC pipes, cement, aggregates, steel reinforcement, manufacturing processes, and testing shall conform to the latest editions of the following Indian Standards, unless otherwise specified: * IS 458: Specification for Unreinforced and Reinforced Concrete Pipes (with and without collars). * IS 12330: Sulphate Resisting Portland Cement - Specification. * IS 456: Plain and Reinforced Concrete - Code of Practice. * IS 1489 (Part 2): Portland Pozzolana Cement - Specification (Fly ash based) (if used in conjunction with Sulphate Resisting Cement, specify permissible blends and compliance). * IS 269: Ordinary Portland Cement - Specification (if used in conjunction with Sulphate Resisting Cement, specify permissible blends and compliance). * IS 383: Specification for Coarse and Fine Aggregates from Natural Sources for Concrete. * IS 1786: High Strength Deformed Steel Bars and Wires for Concrete Reinforcement - Specification. * IS 5382: Specification for Rubber Rings for Water Supply Purposes (for rubber jointed pipes). * Relevant IS codes for testing and quality control.
1.3. Quality Assurance: The supplier shall implement a robust Quality Assurance Plan (QAP) ensuring adherence to all specified standards throughout the manufacturing, supply, and delivery process. The QAP shall be submitted for approval prior to commencement of supply.
2. Materials:
2.1. Cement: * The cement used for manufacturing RCC pipes shall be Sulphate Resisting Portland Cement conforming to IS 12330. * The type of Sulphate Resisting Portland Cement (e.g., Type V) shall be specified based on the severity of sulphate attack anticipated at the site. * The cement shall be fresh, of consistent quality, and stored in a dry and weatherproof manner to prevent deterioration. * Cement shall be tested for compliance with IS 12330 before use, and test certificates shall be provided.
2.2. Aggregates: * Aggregates shall conform to IS 383, and shall be clean, hard, strong, dense, durable, and free from deleterious materials, including excessive quantities of silt, clay, and organic impurities. * Fine Aggregates (Sand): Shall be well-graded and of suitable quality as per IS 383. * Coarse Aggregates: Shall be crushed or uncrushed gravel or stone, of appropriate size and grading as per IS 458 and IS 383. The maximum nominal size of coarse aggregate shall be limited to ensure adequate cover to reinforcement and workability.
2.3. Reinforcement: * Steel reinforcement shall be High Strength Deformed (HYSD) steel bars conforming to IS 1786, preferably of grade Fe 500 or as specified. * Reinforcement shall be clean, free from rust, oil, grease, or any other coating that may affect bond with concrete. * Reinforcement shall be accurately bent and placed as per the approved design and drawings and shall be securely tied to maintain position during casting.
2.4. Rubber Rings (for Rubber Jointed Pipes): * Rubber rings, where specified for rubber jointed pipes, shall conform to IS 5382. * The rubber rings shall be of the correct size and profile for the specified pipes, ensuring a watertight joint.
3. Pipe Manufacturing:
3.1. Manufacturing Process: The RCC pipes shall be manufactured using a proven and controlled process ensuring consistent quality and adherence to IS 458. The preferred manufacturing methods include, but are not limited to, vertical casting, spun pipe process, or other approved methods that guarantee pipe integrity and dimensional accuracy.
3.2. Pipe Class and Diameter: * The RCC pipes shall be supplied in the classes and diameters as specified in the Schedule of Quantities/BOQ. * Pipe classes shall be designated as per IS 458 (e.g., NP2, NP3, NP4), indicating their load-bearing capacity and intended application. The specific class will be dictated by the design requirements and site conditions. * Pipe diameters shall be nominal internal diameters as specified in the BOQ and shall conform to standard sizes as per IS 458.
3.3. Pipe Lengths: * Pipes shall be supplied in standard lengths as per IS 458 for the specified diameter and class, unless otherwise specifically requested and agreed upon. Common standard lengths are typically 1 meter, 1.5 meters, 2 meters.
3.4. Joint Type: * Pipes shall be manufactured to be suitable for either collar joints or rubber joints as indicated in the BOQ or project drawings. * Collar Joints: For collar jointed pipes, the collars shall be pre-cast integrally with the pipe or supplied separately as per IS 458. The dimensions and tolerances of the collars shall conform to IS 458. * Rubber Joints: For rubber jointed pipes, the pipes shall be manufactured with grooves or sockets at the ends to accommodate rubber rings conforming to IS 5382. The dimensions and tolerances of the grooves/sockets shall ensure a watertight seal when the rubber ring is fitted and the pipes are jointed.
3.5. Concrete Mix Design: * The concrete mix shall be designed to achieve the required strength and durability for the specified class of pipe and environmental conditions, considering sulphate resistance. * The minimum grade of concrete shall be M-30 or as specified based on design requirements and severity of sulphate exposure. * The mix design shall ensure adequate workability for the chosen manufacturing process and achieve a dense and impermeable concrete structure.
3.6. Curing: * Pipes shall be properly cured as per best practices and IS 456 to achieve the desired strength and durability. Curing methods may include water curing, steam curing, or membrane curing as appropriate and approved.
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4. Testing and Inspection:
4.1. Material Testing: The supplier shall provide test certificates for all materials including cement, aggregates, steel, and rubber rings (if applicable) to demonstrate compliance with the relevant IS standards.
4.2. Pipe Testing: Each batch of manufactured pipes shall be subjected to the following tests as per IS 458: * Crushing Strength Test: To verify the structural capacity of the pipes for the specified class. * Hydrostatic Pressure Test: To check for leakage and water tightness. * Permeability Test: To assess the density and impermeability of the concrete. * Dimensional Checks: To verify dimensions and tolerances as per IS 458. * Visual Inspection: For surface finish, cracks, and other defects.
4.3. Test Certificates: Test certificates for all tests conducted on the pipes shall be provided to the Engineer-in-Charge before dispatch.
4.4. Stage Inspection: The purchaser or their representative shall have the right to inspect the manufacturing process and testing procedures at the supplier's works at any stage.
5. Delivery, Transportation, Storage and Handling:
5.1. Inclusive Rate: The quoted rate shall be inclusive of all costs related to: * Taxes: All applicable taxes including GST or any other levies. * Insurance: Insurance coverage for the pipes during manufacturing, storage, transportation, and delivery until they are properly stacked at the designated site. * Transportation: Cost of transporting pipes from the manufacturing plant to the designated site. * Loading and Unloading: Safe loading at the manufacturing plant and unloading at the designated site. * Conveyance: On-site conveyance of pipes to the designated storage or stacking area. * Storing and Stacking: Proper storing and stacking of pipes at the designated site as per manufacturer’s recommendations and to prevent damage.
5.2. Transportation: Pipes shall be transported in a manner that prevents damage, cracking, or breakage during transit. Suitable packing and securing arrangements shall be used during transportation.
5.3. Loading and Unloading: Loading and unloading shall be carried out carefully using appropriate equipment to avoid impact and damage to the pipes. Pipes shall not be dropped or dragged.
5.4. Storage and Stacking: Pipes shall be stored and stacked on level and firm ground, free from sharp projections or debris. They shall be stacked in a stable manner, ensuring proper support and ventilation to prevent damage and facilitate easy handling. Stacking height shall be limited as per manufacturer’s recommendations and site conditions to ensure safety and prevent pipe failure.
6. Schedule of Quantities/Bill of Quantities (BOQ):
The Schedule of Quantities/BOQ will specify the following details for each item:
- Item Description: (e.g., Providing and supplying ISI standard RCC pipes of sulphate resisting cement)
- Class of Pipe: (e.g., NP2, NP3, NP4)
- Diameter of Pipe: (e.g., 300mm, 450mm, 600mm)
- Joint Type: (Collar Joint / Rubber Joint)
- Unit: (e.g., Meter, Length)
- Quantity: (e.g., in meters or lengths)
7. Payment:
Payment shall be made as per the agreed terms and conditions and based on the actual quantity of pipes supplied and accepted at the site, conforming to this specification and verified by the Engineer-in-Charge.
This detailed specification is intended to provide a comprehensive guideline for the supply of ISI standard RCC pipes using sulphate resisting cement. It is essential to refer to the specific project requirements and consult with relevant engineering professionals for any project-specific modifications or additions to this specification.
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