Small scale testing horizontal shear between composite half-precast and in situ concrete slabs

Abstract

Usage half precast slabs not new in construction industry worldwide generally and Malaysia specifically. However combination lightweight aggregate concrete and normal concrete is something that new in reinforced concrete structural systems. The use of Palm Oil Clinker (POC) as fine aggregates in producing lightweight aggregate concrete give additional values not only for structural application but also environmentally sustainable. One of main concern about half precast slab is horizontal shear mechanism between precast and in-situ concrete. The horizontal shear can be described by stacked layers of material that slide next to each other when the slab/beam bends. In this case, the horizontal shear occurs when the top and bottom layer of prefabricated half-precast slabs slide next to each other. This paper presents an experimental study to investigate the horizontal shear between composite half-precast and in situ concrete slabs. Seven simply supported slabs were prepared and test under flexural test accordance to BS 5950: Part 4. From the experimental carried out, the horizontal shear not occur because there are no slip between both layers of concrete. From the result, found that the plank can carry maximum load of 20kN equivalent to 2000kg. That mean, the slab with 1.5m span can carry the temporary load as much as 2 tones during construction.