Evaluation of Sulfate Resistance of One-Part Alkali-Activated Materials Prepared by Mechanochemistry
Wenda Wu, Shilong Ma, Yuanda Wang, Xuefang Wang, Liwei Xu, Shichang Ye
Appears on pages(s):
mechanochemistry; one-part alkali-activated materials; sulfate attack
In this paper, the resistance of mechanically prepared one-part alkali-activated materials to external sulfuric acid attack was investigated by simulating realistic erosion environments in terms of sulfate type, concentration, and erosion mode. The macroscopic properties of the specimens were measured at different ages. Microscopic analyses were performed by FTIR, XRD, MIP, and other techniques, to obtain the effect of different erosion environments on the mechanical force of chemically prepared one-part alkali-activated materials against sulfate erosion. The study shows that the mechanical properties of the specimens showed a trend of increasing and then decreasing with the extension of erosion time; Compared with Na2SO4 erosion, the erosion damage was the greatest when the sulfate containing Mg2+ was eroded in a dry and wet cycle; the erosion products of Na2SO4 solution coexist in the form of calcite and gypsum, while the erosion products of MgSO4 solution mainly consist of gypsum.