不同养护方式下锂渣反应程度和微观形貌

锂渣反应程度对锂渣混凝土性能的影响较大，为此，采用盐酸溶解法测试水泥-锂渣浆体中锂渣的反应程度，通过电镜扫描和能谱研究水泥-锂渣砂浆的孔结构和水化产物，并探讨养护条件(标准养护、热养护、碱激发、碱激发和热养护)对上述指标的影响。结果表明:锂渣复合胶凝材料中锂渣的反应程度随龄期的延长而增大，养护条件的改变也能促进锂渣反应程度的增长，相对而言，碱激发和热养护的促进作用＞碱激发＞热养护＞标准养护；同时，锂渣的掺入或养护条件的改变都会改变砂浆的孔径分布，达到细化孔结构和改变浆体中水化产物含量的目的。因此，养护条件的改变能促进锂渣反应程度的提高和细化浆体的微观结构。

Reaction degree and morphology of cement-lithium slag slurry using different curing methods

Performance of lithium slag concrete is affected greatly by the reaction degree of lithium slag. For this reason, the reaction degree of lithium slag in cement-lithium slag is tested by HCl solution method. The pore structure of mortar at 3 d is tested by scanning electron microscope(SEM), and hydration products of pure cement mortar and cement-lithium slag at 1-3 d for each curing method are tested by energy-dispersive spectrometer(EDS). Four curing methods (standard curing, heat curing, alkali activated, and composite curing of alkali activated and heat curing) are presented, and their impacts on pore structure and hydration products are discussed. The research results suggest that reaction degree of lithium slag in lithium slag composite cement increases over time, which is lower in early hydration period, especially in 1-3 d. Different curing conditions have different promotion in lithium slag reaction degree. Relatively speaking, the effect of four curing conditions is in the order of composite curing> alkali excitation> heat curing> standard curing. Meanwhile, the incorporation of lithium slag or the change of curing condition will change the distribution of pore diameter, and can refine the pore structure and change the content of hydrated products in the paste. Therefore, the change of curing condition can promote the reaction degree of lithium slag and refine the microstructure of the paste.