Density and compressive strength of foamed concrete as an infill material and configuration of embedded components of composite structural assemblies (CSAs) and their interaction significantly affects performance of composite panels when subjected to external loading. This paper aims to investigate the effectiveness of parameters such as density, compressive strength and locking area on bond strength of embedded components of composite panels. In order to evaluate these parameters, foamed concrete with densities ranging from 800 kg/m(3) to 1200 kg/m(3) were prepared and ten forms of locking patterns with variations in locking area and holes diameter were used as embedded parts of composite panel. The results show that increasing the density of foamed concrete results in higher bond strength and a locking system is an improper technique for foamed concrete with a density lower than 1000 kg/m(3). (c) 2016 Elsevier Ltd. All rights reserved.