Study on Mechanical Properties of Lithium Nitrate in Concrete

Abstract

Alkali aggregate reaction continues to be a very severe problem in terms of concrete durability many despite physical and chemical mitigation techniques that successfully prevent it for extended time, aggregates have been considered inert materials. Alkali silica reaction, many chemicals like lithium, lithium hydroxide, lithium bromide, etc. but lithium nitrate and m-sand are employed during this paper. ASTMC 1260 (mortar-bar-test) and mechanical properties test of concrete is also determined. The mechanical properties of concrete were investigated for a six mix proportion comprising a control mix(0M), lithiumnitrate(0.68M,0.7M,0.72M,0.74M,0.76M) lithiumnitrate not only prevents the ASR gel formation but also has a great influence on mechanical properties of concrete. The results indicate that the concrete with 0.76M lithium nitrate has higher strength values. The compressive strength tests were done on the 7th and 28th days. The maximum compressive strength at 28day of 33.43MPa was achieved for the combination, which contains 0.76M of lithium nitrate. The split tensile strength tests were done on the 7th and 28th days. The maximum split tensile strength at 28day of 2.53MPa was achieved the flexural strength tests were done on the 28th day. The maximum flexural strength at 28day of 6.75MPa was achieved.SEM analysis has to be performed for 0.76M to study the micro characteristics of concrete. If used in concrete, Lithium nitrate controls the cracks due to ASR results in increased strength and durability.