The amorphous aluminosilicate gels in the FAGC group subjected to 32-cycle MgS[O.sub.4] attack were much denser in Figure 16 than those in the FAGC 60-day standard curing group in Figure 14.
Based on the observation and analysis in the deterioration of FAGC subjected to magnesium sulfate solution with wetting-drying and heating-cooling cycles, some important parameters such as the compressive strength and microstructure characteristics were studied and analyzed using various analysis tools.
(i) Laboratorial outcomes demonstrated that the compressive strength loss ratio of OPCC and FAGC heating group specimens was 17.8% and 12.7%, respectively, after 32 wetting-drying and heating-cooling cycles.
(iii) The heating-cooling regime enhanced the compressive strength of FAGC samples since polymerization reactions were highly temperature-dependent.
Caption: Figure 2: The visual appearance of OPCC and FAGC specimens before and after sulfate attack.
Caption: Figure 4: Compression strength evolution of FAGC in the standard curing condition and MgS[O.sub.4] attack, respectively.
Caption: Figure 5: Compression strength of OPCC and FAGC specimens in the 32- cycle MgS[O.sub.4] attack and heating group.
Caption: Figure 6: The mass change of OPCC and FAGC samples with the cycle index.
Caption: Figure 10: FTIR of FAGC in the 60-day standard curing condition, heating condition, and 32-cycle MgS[O.sub.4] attack environment, respectively.
Caption: Figure 11: TGA results of OPCC and FAGC in the 60-day standard curing condition and 32-cycle MgS[O.sub.4] attack environment.
Caption: Figure 12: DTG results of OPCC and FAGC in the 60-day standard curing condition and 32-cycle MgS[O.sub.4] attack environment.
Caption: Figure 14: SEM and EDS results of FAGC in the 60-day standard curing group.