What is the minimum grade of concrete for the precast joists?

Grade M20 is the minimum requirement as per Clause 4.2.

What kind of bricks should be used for the prefabricated panels?

Burnt clay solid bricks conforming to IS 1077 with a minimum average compressive strength of 7.5 N/mm² (Clause 4.1).

What is the minimum thickness of the structural topping concrete?

A minimum thickness of 40 mm of in-situ concrete (Grade M15 or higher) is required over the brick panels (Clause 7.4).

How is the system designed?

The composite section (joist, brick panel, and topping) is designed as a T-beam in accordance with the principles of IS 456 (Clause 9.1).

IS 14143

: 1994

prefabricated brick panel and partially precast concrete joist for flooring and roofing

CurrentSpecializedSpecificationBIMStructural Engineering · Planning, Housing and Pre-fabricated Construction

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This standard specifies the requirements for a composite flooring and roofing system using prefabricated brick panels supported on partially precast reinforced concrete joists. It covers the materials, dimensions, manufacturing, erection, and design criteria for this rapid construction technology, suitable for residential and commercial buildings.

prefabricated brick panel and partially precast concrete joist for flooring and roofing

Quick Reference Values

Minimum grade of concrete for precast joistsM20

Minimum grade of concrete for in-situ toppingM15

Minimum compressive strength of bricks7.5 N/mm²

Maximum water absorption for bricks20% by weight

Minimum thickness of in-situ structural topping40 mm

Minimum end bearing for joists on support75 mm

Practical Notes

Proper seating of brick panels on joists and complete filling of joints with mortar/concrete is crucial to achieve the intended composite action.

Care must be taken during handling and transportation of the slender precast joists to avoid damage or flexural cracks before installation.

The quality of bricks is critical as their strength directly contributes to the overall strength and stiffness of the composite slab.