the present work has been performed to eliminate sewage dry sludge of alborze city wastewater treatment plant by using them as fine aggregate in concrete. on this basis, at first the selected dry sludge was analyzed for xrd and xrf for crystalline phases and chemical composition, respectively. the results showed that more than 50% of the sludge is formed of sio2 and it had more than 20% organic...

Abstract This study investigates the effect of replacement recycled concrete as coarse aggregates using Densified Mixture Design Algorithm Method (DMDA) in unconfined behavior. DMDA was applied to produce with least void. Compressive strength, flexural strength and split tensile tests were conducted on 7-, 14-, 28- 56-day old specimens. test results showed that specimens 20, 30, 40% RCA replace...