EFFECT OF LITHIUM BASED ADMIXTURE ON MECHANICAL PROPERTIES AND ALKALI AGGREGATE REACTION IN CONCRETER. Manju
For a long time, aggregates have been considered as inert materials but later on, particularly, after 1940s it was clearly brought out that the aggregates are not fully inert. Lithium, if used in concrete, it controls the cracks due to alkali aggregate reaction. This leads to increase in strength and durability of the concrete. In this paper, a critical review of the research work done so far on the suppression of alkali aggregate reaction in the presence of lithium compounds is provided and the mechanical properties of concrete with various amounts Lithium Nitrate has been studied. The paper also deals with the mechanical properties and alkali aggregate reaction was studied. Lithium based admixtures are effective in suppression of alkali silica reaction and delayed ettringite formation, if the dosage added is appropriate. Among all Lithium based admixtures, LiNO3 proves to be promising one. The aim of this project is to assess the effectiveness of LiNO3 at various dosage levels. To prove the expansive nature of aggregate, accelerated mortar bar expansion test have been done. M- Sand founds to be reactive in nature. In this present investigation, six mix proportions, comprising of control mix, lithium nitrate at 0.6M, 0.65M, 0.7M, 0.75M, 0.8M, were studied. The compressive strength tests, tensile strength tests, flexural strength tests were conducted to assess the strength properties of lithium based admixture concrete. LiNO3 not only prevents the ASR gel formation, but also it has great influence on mechanical properties of concrete. SEM analyses have been performed for 0.75M and control mix to study the micro characteristics of concrete.
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