Abstract: Class F fly ash has the low reaction degree and low strength problems in geopolymer synthesis at ambient temperature. In this study, 20% red mud was added to Class F fly ash to synthesize geopolymer, of which the mechanical properties were investigated. In addition, microstructural change of the geopolymer was explored with SEM, EDS and FT-IR. Furthermore, the effect of n(Si)/n(Al) = 1.8—2.5 and n(Na)/n(Al) = 0.8—1.1, and curing period at 100% relative humidity for 0—7 days on the red mud-fly ash based geopolymer was investigated. It found that the mechanical properties of the ambient temperature cured red mud-fly ash based geopolymer were significantly improved compared to the Class F fly ash based geopolymer. In addition, n(Si)/n(Al)=2.0—2.2 and n(Na)/n(Al)l=1.0 were the optimum chemical composition for the synthesis of red mud-fly ash based geopolymer, and higher curing humidity was beneficial for its early strength. The improving effect of red mud on the ambient condition cured fly ash based geopolymer was found. It also revealed that the more compact microstructure, the more geopolymer gels formed and higher reaction degree of red mud-fly ash based geopolymer than fly ash based geopolymer were the main reasons for the better mechanical properties of the former one.
张默, 王诗彧. 常温制备赤泥-低钙粉煤灰基地聚物的试验和微观研究[J]. 材料导报, 2019, 33(6): 980-985.
ZHANG Mo, WANG Shiyu. Experimental Investigation and Microstructural Analysis of Ambient Temperature Cured Red Mud-Class F Fly Ash Based Geopolymer. Materials Reports, 2019, 33(6): 980-985.
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2019, Vol. 33 
