Effect of Sodium Stearate on the Microstructure and Hydration Process of Alkali-Activated Material

In response to the high water sorptivity of alkali-activated slag–red mud–steel slag cementitious material (AASRSS), and aggressive ions are easily transferred interior materials, which poses a significant threat their durability. order limit transfer moisture AASRSS, sodium stearate (NaSt) was utilized in this paper reduce its sorptivity. The aim study elucidate role NaSt AASRSS system. changes compressive strength mortar were tested by mixing different amounts into mortar. hydration process microstructure after with analyzed using test methods isothermal calorimetry, resistivity, SEM MIP. results showed that plays an important pore structure characteristics use significantly reduces improvement caused two main mechanisms, namely optimization (reduction defects alteration size distribution) introduction hydrophobic film on surface. addition did not change type product, but it inhibited reaction, leading reduction product. combination increased porosity reduced products mainly accounts for decrease due NaSt.