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Effectiveness of LiOH in inhibiting alkali-aggregate reaction and its mechanism

Research paper by I. X. Y. Mo, Z. Z. Xu, K. R. Wu, M. S. Tang

Indexed on: 01 Jan '05Published on: 01 Jan '05Published in: Materials and Structures



Abstract

A practical alkali-reactive aggreagate—Beijing Aggregate—was used to test the long-term effectiveness of LiOH in inhibiting alkali-aggregate reaction expansion. In this paper, not only the most rigorous conditions, such as the mortar bars being cured at 80°C, for 3 years after autoclaved 24 hours at 150°C, but also the 20°C long-term curing condition, were designed. At these conditions, LiOH was also able to inhibit ASR expansion long-term effectively. Not only the relationship between molar ratio of n(Li)/n(Na) and the alkali contents in systems was established, but also the governing mechanism of such effects was also studied by SEM and EDS.