Effect of LiNO3 on expansion of Alkali-Silica reaction in rock prisms and concrete microbars prepared by sandstone

Jinxin Liu, Lanqing Yu, Min Deng

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4 引用 (Scopus)

摘要

The aim of this research is to investigate the effect of LiNO3 on the alkali-silica reaction (ASR) expansion of reactive sandstone and the mechanism through which this occurs. This paper presents the results from tests carried out on rock prisms and concrete microbars prepared by sandstone and LiNO3. The findings show that LiNO3 does not decrease the expansion of these samples unless the molar ratio of [Li]/[Na + K] exceeds 1.66, and the expansion is greatly increased when its concentration is below this critical concentration. The expansion stress test proves that Li2SiO3 is obviously expansive. X-ray diffraction (XRD) and scanning electron microscope (SEM) results indicate that LiNO3 reacts with the microcrystalline quartz inside sandstone, inhibiting the formation of ASR gel, and the formation of Li2SiO3 causes larger expansion. A high concentration of LiNO3 might inhibit the ASR reaction in the early stages, and the formation of Li2SiO3 causes expansion and cracks in concrete after a long period of time.

源语言英语
文章编号1150
期刊Materials
12
7
DOI
出版状态已出版 - 2019

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