Study on the Influence Mechanism of Polyaluminum Chloride on the Hydration and Microstructure of Slag-lithium Slag Alkali-activated Cementitious Materials
In order to improve the comprehensive utilization rate of lithium slag,the effects of polyaluminium chloride content on the mechanical properties,hydration properties and microstructure of slag-lithium slag alkali-activated cementitious material paste test block were investigated.The hydration products,microstructure,pore structure and hydration heat release of slag-lithium slag alkali-activated cementitious material paste test block with different polyaluminium chloride content were test-ed by XRD,SEM,MIP and hydration calorimeter,and its mechanism was analyzed.The results show that the addition of poly-aluminium chloride can improve the degree of hydration reaction of slag-lithium slag alkali-activated cementitious material paste test block,especially the improvement of early hydration reaction degree is more obvious,and shorten the end time of hydration induction period of slag-lithium slag alkali-activated cementitious material paste test block.The time of the temperature peak in the acceleration period is gradually advanced.Compared with SL-0,the exothermic peak of SL-3 in the acceleration period is increased by 46.1%.A large amount of ettringite(AFt)and C-(A)-S-H are mainly generated during the hydration process of the slag-lithium slag alkali-activated cementitious material paste test block.With the increase of polyaluminium chloride con-tent,the porosity and average pore size of the paste test block decrease,and the structure of the paste test block become dense.Compared with SL-0,the average pore size and porosity of SL-3 decrease by 16.1%and 8.9%,respectively,this is because the aluminum hydroxyl complex produced by the hydrolysis of polyaluminium chloride plays a role of electrical neutralization and bonding bridging with higher charge and larger molecular weight,which can adsorb liquid ions,thus promoting the hydration of the slag-lithium slag alkali-activated cementitious material paste test block,generating more hydration products,making the structure of the paste test block more compact.
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