Compressive and Tensile Behavior of Lime Added Geopolymer Concrete.

Abstract

Concrete is the most used material, which required large quantities of Ordinary Portland Cement (OPC). OPC production is held responsible for some of the CO₂ emissions, which polluted the atmosphere. Hence, it is inevitable to find an alternative material to OPC. Geopolymer concrete is a best alternative which shall be produced by the chemical action of inorganic molecules. This paper focuses fly-ash based Geopolymer concrete with addition of lime. In the geopolymer concrete, cement is completely replaced by fly ash (P60). Sodium Hydroxide (NaOH) and Sodium Silicate (Na₂SiO₃) of 13 moles was initially used as an alkaline solution with Na₂SiO₃: NaOH ratio 2.5. Three type of lime samples is used i.e. Quick, Hydrated and Slaked with variation in lime percentiles as 5%, 10%, 15% and 20%. Also 10, 13, 16 and 19 molarity are used along with optimum lime percentage for comparative and tensile behavior study. After specified period samples are remolded and cured at natural sun shade for 24 hours. After natural curing hours, optimum rest period is taken as 7 days. Sample having size 150 X 150 X 150 mm was tested for compressive strength and split tensile strength. Slump cone test and flow table test on fresh mix sample is also performed.