CE Materials, Portland Cement, Page 1Testing of ConcreteProperties of ConcreteFresh Concrete:WorkabilityAir contentHardened Concrete:Destructive Tests:Compressive StrengthTensile StrengthFlexural StrengthModulus of ElasticityNondestructive Tests:Rebound HardnessUltrasonic Pulse VelocityImpact-Echo MethodWorkabilityWorkability: amount of mechanical work required to achieve full compaction of the concrete without segregationFactors affecting workability:Water content of the mixInfluence of the aggregateTime and temperatureCement CharacteristicsAdmixtures
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CE Materials, Portland Cement, Page 2Slump TestWorkability measured by slump test 12”slump1.Layer 1: Fill 1/3 full. 25stokes2.Layer 2: Fill 2/3 full. 25stokes3.Layer 3: Fill full. 25stokes4.Lift cone and measure slump (typically 2-6 in.)1 2 3 4Slump TestSlump test:Normal (true) slump: general subsidence of the massShear slump: distinct shearing of the concrete from one side of the concreteCollapse slump: a lean or very wet mixWorkability