Microstructure and Mechanical Properties of Polymer-Phosphazene Mortar Exposed to Sulfate Attack

This study investigated polymer phosphazene mortars subjected to external sulfate attack for 1 year to examine their resistance to the sulfate effect Then, the mechanical properties and microstructure of polymer phosphazene mortars were studied. The number of experiments was reduced by selecting the L-25 orthogonal array. Samples were produced in sizes of 50 x 50 x 50 mm (1.97 x 1.97 x 1.97 in.) and 25 x 25 x 285 mm (0.98 x 0.98 x 11.22 in.). The samples were dried at 105 +/- 5 degrees C (221 +/- 9 degrees F) for 24 hours after curing for 28 days. Later; the monomer containing phosphazene was impregnated to samples at atmospheric conditions for 1 day. The polymerizations of samples were carried out at 60 degrees C (140 degrees F) for 4 hours. These samples were subjected to sulfate attack for 30, 60, 90, 180, and 365 days.