锂渣掺量对锂渣-矿渣碱激发低碳胶凝材料的性能影响

The Effect of Lithium Slag Content on the Performance of Lithium Slag-slag Alkali Activated Low-carbon Cementitious Materials

文中以矿渣-锂渣为前驱体,研究不同锂渣掺量对矿渣-锂渣碱激发低碳胶凝材料的力学性能及水化微结构的变化,利用XRD、SEM和压力试验机分别测试碱激发矿渣-锂渣胶凝材料的水化产物、微观形貌和力学性能。结果表明,锂渣由于存在大量二水石膏,矿渣-锂渣碱激发低碳胶凝主要水化产物为钙矾石、非晶态C-(A)-S-H和氢氧化钙;锂渣对矿渣-锂渣碱激发低碳胶凝材料具有缓凝作用,随锂渣掺量增加,矿渣-锂渣碱激发低碳胶凝材料的早期抗压强度呈现先下降后上升的趋势。

The paper studies the mechanical properties and hydration microstructure changes of low-carbon cementitious materials excited by slag lithium-slag alkali with different lithium slag dosages,using slag lithium-slag as the precursor.XRD SEM and pressure testing machine were used to test the hydration products,microstructure,and mechanical properties of alkali activated slag lithium-slag cementitious materials.The results showed that due to the presence of a large amount of dihydrate gypsum in lithium slag,the main hydration products of low-carbon cementation excited by slag lithium-slag alkali were ettringite,amorphous C-(A)-S-H,and calcium hydroxide;Lithium slag has a retarding effect on low-carbon cementitious materials activated by slag lithium-slag alkali.With the increase of lithium slag content,the early compressive strength of low-carbon cementitious materials activated by slag lithium-slag alkali shows a trend of first decreasing and then increasing.