Experimental study on testing working performance of high strength light weight concrete floors using cenosphere from fly ash

Abstract

The test reinforced concrete floor slabs are made from high-strength lightweight concrete (FAC – HSLWC) with grades of D1400 and D1500 by mass and normal concrete with the same 28-day compressive strength of 45 Mpa. Evaluate the working behavior of the tested reinforced concrete floor slabs through the following parameters: load capacity, crack formation and development, concrete deformation (compression zone, tensile zone), deflection. The results show that the load at the allowable deflection, the load at the crack opening of 0.3 mm and the ultimate load of the FAC-HSLWC slab is equivalent to that of a conventional concrete slab. The different behavior of FAC-HSLWC floor slabs compared to conventional concrete slabs is: the first crack appeared much earlier and appeared many cracks around the mid-span area but the crack opening and The crack development (in length and width) is much smaller than that of ordinary concrete floors. FAC-HSLWC floor slabs have the failure mechanism of splitting and sliding between the light concrete layer below and the heavy concrete layer (compensation) above while the concrete floor slabs often fail due to the destruction of concrete in the compression zone.