首页|Influence of crystal-transforming agent on the performance and mechanism of a-high-strength gypsum prepared from FGD gypsum
Influence of crystal-transforming agent on the performance and mechanism of a-high-strength gypsum prepared from FGD gypsum
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This paper investigates the impact of flue gas desulfurization(FGD)gypsum's crystal modifier on the characteristics and microcosmic mechanism of α-high strength gypsum.The results demonstrate that all three crystal modifiers can convert FGD gypsum to α-high-strength gypsum.Citric acid(CA)has the most significant influence on α-high-strength gypsum,and the prepared α-high-strength gypsum is short columnar,with an aspect ratio in the range of 1-3,and has a faster setting time,a larger specific surface area,and a smaller standard consistency,higher compressive strength,greater surface hardness,and smaller crystal particle size.The initial setting time of the α-high-strength gypsum manufactured with CA crystal modifier was decreased by 36％compared to the blank sample,the final setting time was lowered by 37.5％,and the water consumption of the standard consistency was reduced by 8％.The maximum strength is 32 MPa after 2 h,the absolute dry compressive strength is up to 38 MPa,and the surface hardness is improved by 24.43％.
Flue gas desulfurization gypsumCrystal modifierMicroscopic mechanismα-high-strength gypsum
Zhuoyue Xu、Xiao Wang、Biao Jin、Dawang Zhang、Hui Li
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College of Materials Science and Engineering,Xi'an University of Architecture and Technology,Xi'an,710055,China
School of Materials and Chemical Engineering,Henan University of Urban Construction,Pingdingshan,467036,China
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