Effects of Sulfate Attack on Phase Composition and Pore Structure of Cement-Based Materials
WEN Yong
SUN Xiaoyan
ZHAO Ruixiang
XING Wenze
LIANG Jingyan
Abstract：The effects of sulfate attack on the mechanical properties,phase compositions,and pore structure of cement-based materials were investigated using X-ray diffraction,mercury intrusion porosimetry,and thermodynamic simulation.The results indicate that after 120 d of sulfate attack,the formation of expansive corrosion products such as ettringite is accelerated,leading to significant changes in both macro-and micro-properties.The compressive strength coefficient under erosion shifts from an increasing trend to a decreasing one,accompanied by aggravated mass loss.A higher water-to-cement ratio results in more corrosion products,primarily accumulating in the 10-100 nm transitional pores.The expansion of these corrosion products damages the pore structure,reducing the number of transitional pores while increasing the average pore size from 45.31 nm at 120 d to 78.79 nm at 180 d,ultimately causing severe deterioration of the cement-based materials after 180 d.
Keywords：sulphate attackcement-based materialpore structurethermodynamic simulation
Publication Date：2025-10-30
Online Publishing Date：2025-11-10(First online date of this platform, not the publication date of the document)
Pages：8( 966-973 )