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Subhead 5.0 covers the specifications and requirements for Reinforced Cement Concrete (RCC) work. Below is a detailed explanation of each section along with examples.
Reinforced cement concrete work may be cast-in-situ or precast as directed by the Engineer-in-Charge. The work comprises formwork, reinforcement, and concreting.
These materials must comply with the specifications provided in Chapter 03 (Mortars) and Chapter 04 (Concrete Work).
Example: Using M-30 grade fly ash admixed concrete for a multi-story building to improve durability and sustainability.
Example: Using Fe-500D TMT bars for the reinforcement of a high-rise building to ensure high tensile strength and durability.
Formwork should be designed to safely support the concrete and any construction loads. It should prevent deformation and be treated with a release agent to ensure easy removal.
Formwork should be designed to maintain the dimensions and shapes of the concrete within specified tolerances.
Example: Using steel formwork for casting columns to achieve a smooth finish and precise dimensions.
Formwork should be properly supported and braced to prevent movement during concreting.
The surface of the formwork in contact with concrete should be treated with a release agent to prevent adhesion.
Formwork should be inspected before pouring concrete to ensure it is clean, properly aligned, and adequately supported.
Example: Inspecting the formwork for a slab to ensure it is free of debris and securely braced before pouring concrete.
Formwork should be measured by area in square meters.
The rate includes the cost of materials and labor for providing and removing the formwork.
Reinforcement bars should be placed as per the drawings or as directed by the Engineer-in-Charge. Bars crossing one another should be tied with steel wire.
Welding of reinforcement bars should comply with IS 2751 and 9417.
Example: Welding steel bars for a bridge deck to ensure strong joints and structural integrity.
Reinforcement bars should be placed and secured in the correct position using cover blocks, spacers, and templates.
Example: Using pre-cast cover blocks to maintain the correct cover of concrete over reinforcement in a beam.
Reinforcement should be measured in kilograms.
The rate includes the cost of steel, labor for cutting, bending, binding, and placing reinforcement in position.
The consistency of the concrete should be such that it can be properly placed and compacted without segregation.
Concrete should be placed in its final position and compacted before it starts to set.
Concrete should be compacted using mechanical vibrators to remove air pockets and ensure density.
Example: Using a mechanical vibrator to compact concrete for a retaining wall to ensure strength and durability.
Construction joints should be properly prepared and located to minimize cracking.
Expansion joints should be provided to accommodate thermal expansion and contraction.
Concrete should be cured for a minimum of 7 days to ensure proper hydration and strength development.
Example: Covering a concrete slab with wet hessian cloth for curing to maintain moisture and achieve desired strength.
Minor surface defects should be rectified to ensure a smooth and uniform finish.
Example: Patching small voids in a concrete column to improve the appearance and durability.
The strength of concrete should be tested as per the requirements.
Example: Conducting a cube test to measure the compressive strength of concrete used in a foundation.
Concrete should be tested for slump, compressive strength, and other parameters as specified.
Example: Performing a slump test on-site to ensure the workability of fresh concrete.
Concrete should meet the specified acceptance criteria for strength and quality.
Concrete work should be measured in cubic meters.
Tolerances for concrete work should be within the specified limits.
The rate includes the cost of materials, labor, and equipment for mixing, placing, compacting, and curing the concrete.
Rolled steel sections should be encased in concrete as specified.
Steel sections should be wrapped with specified materials before encasing in concrete.
Formwork for encasing steel sections should be designed to hold the concrete in place until it sets.
Concrete should be placed around the steel sections and compacted to ensure proper encasement.
Encasing steel sections should be measured by length and dimensions.
The rate includes the cost of materials and labor for encasing steel sections in concrete.
Precast concrete units should be cast in forms or molds and meet the specified quality standards.
Concrete used for precasting should be well-proportioned, mixed, and compacted.
Precast units should have a dense surface finish, free from defects.
Reinforcement in precast units should have the specified cover to ensure durability.
Precast units should be properly cured to achieve the required strength.
Precast units should be marked for identification and placement.
Example: Using precast concrete panels for the facade of a building to ensure high-quality finish and faster construction.
Precast jali should be fixed as per the specifications.
Precast jali should be measured in square meters.
The rate includes the cost of materials and labor for providing and fixing the precast jali.
Design mix concrete is prepared with specified proportions to achieve the desired strength and durability.
Concrete mix design should be done as per IS 456 guidelines.
Standard deviation should be calculated based on test results to determine the quality of concrete.
Concrete should meet the specified acceptance criteria for strength and quality.
The cement content in concrete should be as per the specified limits.
The water-cement ratio should be kept as low as possible, and the slump should be controlled for proper workability.
The design mix should be approved by the Engineer-in-Charge before use.
Example: Designing a concrete mix for an M40 grade concrete with specific proportions of cement, sand, aggregate, and water to achieve the desired strength for a high-rise building.
Thu Jul 18, 2024
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