Molecular dynamics simulation study of the transport of pairwise coupled ions confined in C-S-H gel nanopores.

[Display omitted] • Transport behaviors and mutual influences of three ionic compounds in C-S-H gel nanopores were studied. • When sulfate and nitrite ions coexist, the transport rate of solution in C-S-H gel nanopores is greatly reduced. • The degree to which anions influence the transport rate of solution is ranked SO 4 2 - > Cl - > NO 2 -. • The relationship between dipole moment and hydrogen bond interaction was verified through current simulation. Ions that penetrate concrete micropores have a significant influence on concrete's properties. Studying the microscopic interaction mechanisms between ions and concrete materials allows the discovery of factors that significantly affect concrete properties from a new perspective. In this study, molecular dynamics techniques were used to simulate the transport processes of different ionic compounds (Na 2 SO 4 , NaCl and NaNO 2) in C-S-H gel nanopores in a pairwise coupled way, so that a detailed investigation into how these ions interact with each other and how they affect C-S-H gel could be carried out. It was found that for anions entering the C-S-H gel nanopores, the order of transport rate is SO 4 2->Cl->NO 2 –. Furthermore, the SO 4 -Na ion pair greatly affects the transport rate of solution due to its strong binding stability. Additionally, this study found that the presence of sulfate ions changed the transport characteristics of nitrite ions, such that nitrite ions aggregated into clusters more easily, thereby disrupting the compatibility between nitrite ions and water molecules. As a result, the presence of sulfate ions reduced the rustproofing effect of nitrite ions. [ABSTRACT FROM AUTHOR]