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Compressive StrengthGeopolymer MortarsUltrasonic Pulse VelocityConstruction IndustrySustainable ConstructionFlexural StrengthFly AshCompressive and Flexural StrengthOrdinary Portland CementWater AbsorptionGeopolymer MortarNatural PozzolanSustainable BuildingsSelf-Compacting ConcreteSustainable BuildingBuilding MaterialsConstruction SectorSupplementary CementitiousRecycled Aggregate ConcreteSustainable Material