👉In building construction, a spacer (also called cover block or concrete spacer) is a small component used to maintain the correct distance between reinforcement bars and the formwork in columns, beams, and slabs.

🚧Meaning of Spacer

🏷A spacer ensures the required concrete cover around steel reinforcement so that steel does not touch the shuttering or ground.

⭐️Why Spacers Are Important
Spacers are used to:

⏺Maintain specified concrete cover
⏺Protect steel from corrosion
Ensure proper bonding between concrete and steel
Improve durability and strength of the structure
⏺Maintain correct bar position during concreting

🔰Spacer in Different Structural Elements

1️⃣ Spacer in Column
Keeps vertical bars away from column formwork
Ensures uniform cover on all sides
Common cover: 25–40 mm (depends on design)

2️⃣ Spacer in Beam
Maintains bottom and side cover of beam reinforcement
Prevents steel from touching shuttering
Common cover:
Bottom: 25 mm
Side: 20–25 mm

3️⃣ Spacer in Slab
Supports bottom reinforcement mesh
Maintains cover from slab shuttering
Common cover: 15–25 mm

🏷Types of Spacers

⏺Concrete spacers (most common, durable)
⏺Plastic spacers (easy to use, light)
⏺Stone or brick pieces (not recommended)

📜Simple Definition

Spacer: A small block used in RCC works to maintain required concrete cover between reinforcement bars and formwork in columns, beams, and slabs.

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