This article presents the fire resistance of cube compressive strength of cement mortar to ascertain the significance of the treated domestic water and lime concentration in the mixes. The specimens were exposed to different temperatures from 100 to 7000C with an increment of 1000C. The cube specimens were cast with various treated water dosages of 0,25,50,75 and 100% as replacement to potable water and for effective replacement the lime concentrations are varied from 0 to 30% by weight of water added to the mixes. From the results it came to know that 50% of Treated water and 25% of lime concentration provided remarkable results for OPC mix. Few models are generated for evaluation of experimental results.
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