ASR与冻融耦合作用下掺锂渣混凝土损伤研究

Study on Damage of Concrete with Lithium Slag Mixed by ASR and Freeze-Thaw Coupling

本文主要研究了掺锂渣混凝土在冻融循环和碱硅酸反应耦合作用下的损伤规律.试验结果表明:混凝土先经碱硅酸反应后进行冻融循环作用时,碱硅酸反应对冻融循环有一定促进作用;混凝土先经冻融循环后进行碱硅酸反应作用时,冻融循环促进了碱硅酸反应的进行,随着冻融循环次数的增加,促进作用增强,加剧了试件的损伤;在耦合作用下,适量的锂渣掺入可以减弱混凝土在耦合作用下的损伤,掺量20%效果最佳.

This paper mainly studies the damage law of concrete with lithium slag under the action of freeze-thaw cycle and alkali silicate reaction(ASR)coupling.The experimental results show that the alkali silicate reaction can promote the freeze-thaw cycle of concrete.When the concrete is subjected to the alkali silicate reaction after the freeze-thaw cycle,the freeze-thaw cycle promotes the alkali silicate reaction.With the increase of the number of freezing-thawing cycles,the promotion effect was enhanced,which aggravated the damage of the specimen.Under the coupling action,the damage of concrete can be weakened by the addition of proper amount of lithium slag,and the content of 20%is the best.