This paper presents the comparison physical study of solid waste of Bottom Ash Aggregate (BAA) and Washed Bottom Ash Aggregate (WBAA) as fine aggregate in concrete. The BAA is a waste material that is taken from electric coal power plant and the basic source material of WBAA is a treated bottom ash. The BAA is fully submerged in clean and clear water for 3 days to produce a WBAA with low amount of carbon. This WBAA with low carbon composition is utilised to produce concrete with less percentage of carbon usage. Low amount of carbon can reduce energy in building, reduce environmental impact and can be supported to green material in concrete. So that, this two types of bottom ash were studied their physical properties and then compared. The aim of the study is to investigate the physical comparison of BAA and WBAA in producing concrete or concrete applications. The results of the sieve analysis and fineness modulus of BAA and WBAA were discussed. The calculated of fineness modulus of BAA and WBAA are 4.93 and 3.65 respectively, which are more than 3.5 and it is considered very coarse. Finally, it is concluded that this both aggregate is potential for utilise in concrete and mortar or concrete/mortar application.