Eco-friendly mix for Roller-Compacted Concrete: Effects of Persian-Gulf-Dredged marine sand on durability and resistance parameters of concrete

Dredged marine sediment (DMS) is a by-product obtained from harbours and dry dock stations harmful to the environment and marine structures. In this study, the effects of replacing sands obtained from quarries with different percentages of DMS (15%, 25%, 35%, 50%, and 100%) dredged from the Persian Gulf on the properties of a roller-compacted concrete pavement (RCCP) were investigated. Three types of Portland cement, i.e. Type II, Type V, and special Portland pozzolanic cement (PC2, PC5, and SPPC) were utilised, along with ground-granulated blast-furnace slag (GGBS_15%) and fibre-reinforced polymer (FRP_1.25%), to improve the resistance and durability properties of RCCP. Compressive strength (CS), special electrical resistance (ER), water absorption (WA), water permeability under pressure, sulphate attack and scanning electron microscopy (SEM) tests were performed after curing the concrete specimens. The maximum CS, and ER, and the minimum water penetration, WA, and weight loss (WL) of concrete in a 5% sodium sulphate solution, were observed for 15% DMS replacement in PC5. Additionally, the maximum sulphate resistance for 25% DMS and 15% GGBS contents was observed in SPPC after one year. (C) 2021 The Authors. Published by Elsevier Ltd.