Experimental and theoretical study of precast beam-slab construction

Abstract

The use of partially precast beam elements with shear connectors in slab construction relieves the requirement of extensive use of soffit formwork and props and will have the advantage of faster construction. It also reduces adverse effects associated deforestation.

Experimental and theoretical investigations were conducted to study the strength and deformation characteristics of two types of precast slab systems. Type A slab is with 50 mm topping while type B slab is without topping.

Part of the experimental program was dedicated to the study of mix design for the production of suitable hollow concrete beam tiles which bridge the space between the precast beam elements. The second part of the test program included the study of the precast beam element alone in order to investigate the response under load of the precast slab while the cast in-situ concrete is still in its plastic state. The third part of the experimental program was concerned with fall size slab testing. Theoretical investigations were conducted parallel to the experimental investigations.

Comparison of the results showed very good agreement leading to the conclusion that basic mechanics of reinforced concrete can be used for design and analysis of precast beams and/or precast slab systems.