Short Answer:

Shuttering in RCC construction is the temporary structure or mold used to hold and shape freshly poured concrete until it sets and gains enough strength. It supports the weight of concrete and reinforcement during casting and ensures the desired dimensions and surface finish of structural elements like beams, slabs, and columns.

Shuttering is usually made of materials like timber, plywood, steel, or plastic and must be strong, stable, and leak-proof. Properly installed shuttering prevents concrete leakage, maintains alignment, and plays a key role in achieving quality construction.

Detailed Explanation:

Shuttering in RCC construction

Shuttering is the formwork used in RCC (Reinforced Cement Concrete) construction to provide the desired shape and support to the fresh concrete until it becomes hard and strong. It acts as a mold for structural members like columns, beams, slabs, and walls. Without shuttering, concrete would flow and lose its shape before setting.

Good shuttering ensures correct size, alignment, and surface finish of the RCC element. It must be rigid enough to resist the pressure from wet concrete and vibrations during compaction. Shuttering is removed after a specific period known as stripping time, depending on the type of concrete element and temperature conditions.

Key Features and Functions of Shuttering

1. Shape and Support
   • Shuttering defines the shape and size of the RCC member being cast.
   • It supports the weight of wet concrete and reinforcement bars until concrete sets.
2. Material of Shuttering
   • Timber/Plywood: Commonly used for small-scale work. Easy to handle and modify.
   • Steel: Durable, gives smooth finish, suitable for repeated use in large projects.
   • Aluminum/Plastic: Lightweight, corrosion-resistant, often used for modern systems.
   • Choice of material depends on project size, cost, and required finish.
3. Leakage Prevention and Surface Finish
   • Properly sealed shuttering prevents cement slurry from leaking.
   • Tight joints and oiled surfaces ensure smooth and uniform concrete finish.
4. Proper Alignment and Stability
   • Shuttering must be aligned correctly to maintain the exact dimensions.
   • Braces and props are used to keep it stable during concreting and vibration.
5. Reusability and Cost-Efficiency
   • Materials like steel and plastic are reusable and cost-effective for large projects.
   • Timber is used less frequently as it wears out faster.

Shuttering Procedure

1. Planning and Layout
   • Drawings are prepared showing shuttering dimensions, positions, and support points.
2. Assembly and Erection
   • Panels and supports are fixed according to layout. Oil or releasing agent is applied inside to ease removal.
3. Inspection Before Concreting
   • All joints and supports are checked for gaps or weak spots. Proper alignment is confirmed.
4. Concrete Placement
   • Concrete is poured carefully into the shuttering. Vibrators are used for compaction.
5. Stripping or Removal
   • After curing for the required time (1–2 days for vertical faces, 5–7 days for slabs), shuttering is removed gently to avoid damage.
6. Cleaning and Storage
   • Reusable panels are cleaned, repaired if needed, and stored for next use.

Conclusion:

Shuttering in RCC construction is a temporary but essential support system that shapes and holds the concrete until it sets. Good shuttering ensures accurate dimensions, smooth surfaces, and structural safety. Its quality directly affects the strength, finish, and durability of the RCC work. Proper planning, material selection, and workmanship in shuttering lead to better construction results.