Simultaneous effect of granite waste dust as partial replacement of cement and magnetized water on the properties of concrete exposed to NaCl and H_2SO_4 solutions

摘要

The aim of this study is to investigate the simultaneous effect of granite waste dust (GWD) as partial replacement of cement (PRC) and magnetized water (MW) on the mechanical and durability properties of concrete specimens exposed to two aggressive environments (NaCl and H2SO4 solutions). For this aim, 10 concrete mixes with different GWD ratios (0%, 5%, 10%, 15% and 20%) were prepared using tap water (TW) and MW. The specimens were first cured in lime-saturated water for a duration of 28 days and then they were exposed to 5% by weight NaCl and H2SO4 solutions for a period of 91 days. A number of tests such as compressive strength, resistance to acid attack, water absorption, open circuit potential (OCP) were performed. The results showed that the mechanical and durability properties of concrete improved by using MW, regardless of the GWD incorporation ratio. It was also found that using high amounts of GWD leads to lower strength and durability performance of the specimens due to the reduction of cement content and a more porous microstructure, regardless of the water type used. (C) 2021 Elsevier Ltd. All rights reserved.