What is the difference between RB and RBC construction?

RB (Reinforced Brickwork) uses reinforced mortar joints between bricks, while RBC (Reinforced Brick Concrete) involves laying bricks with gaps that are filled with concrete and reinforcement, creating a composite slab.

What is the minimum grade of concrete specified for RBC work?

M15 grade concrete is specified as the minimum for Reinforced Brick Concrete work (Clause 3.3).

What is the main advantage of an RBC slab?

RBC slabs can be more economical where bricks are inexpensive, reduce the overall dead weight compared to a solid concrete slab of the same depth, and provide better thermal insulation.

What type of reinforcement is typically used?

The code primarily refers to mild steel and medium tensile steel bars conforming to IS 432.

IS 10440

: 1983

Code of practice for construction of RB and RBC floors and roofs

CurrentSpecializedCode of PracticeStructural Engineering · Building Construction Practices incl. Painting, Varnishing

Download PDF BIS Portal Google

This code of practice covers the construction of reinforced brick (RB) and reinforced brick concrete (RBC) floors and roofs. It details the requirements for materials, workmanship, formwork, reinforcement placement, and construction procedures for this composite system.

Code of practice for construction of RB and RBC floors and roofs

Quick Reference Values

Minimum grade of concrete for RBC workM15

Minimum cover to reinforcement15 mm or diameter of bar, whichever is greater

Maximum nominal size of aggregate for RBC12.5 mm

Minimum period for striking formwork for slabs (props retained)3 days

Minimum curing period7 days for Ordinary Portland Cement

Practical Notes

RB and RBC construction is a traditional method, largely superseded by modern RCC construction; its use is now specialized, often in areas with abundant and cheap bricks.

The quality of bricks (uniform shape, good strength) and the complete filling of all joints with mortar or concrete are critical for achieving monolithic structural behaviour.

This technique is labour-intensive and requires skilled masons for proper execution compared to conventional RCC.