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Effect of sulphate content of cement upon heat evolution and slump loss of concretes containing high-range water-reducers (superplasticizers)
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References
1980
Year
EngineeringCement ManufactureOrdinary Portland CementConduction CalorimeterMaterials ScienceSo 3Slump LossCementationConcrete TechnologyReinforced ConcreteCementitious MaterialsHeat EvolutionPlasticityCement-based Construction MaterialConcrete StructuresHigh Temperature MaterialsMechanical PropertiesEnvironmental EngineeringCivil EngineeringSulphate ContentConstruction Engineering
Synopsis At normal temperatures (25°C), concretes containing superplasticizers lose much of their initial high workability within approximately 45 minutes from initial mixing. When the concrete is hot (40°C), the effect is more severe with significant workability (slump) loss occurring within 30 minutes. In this study, the optimum range of SO 3 , contents for an ordinary Portland cement, with and without superplasticizer addition, has been determined at these two temperatures by using a conduction calorimeter and Lerch's criteria for optimum SO 3 content. Concretes were manufactured at both temperatures using cements with the as received and modified SO 3 contents, identified in the calorimeter study. It is concluded that there is an optimum range of SO 3 content for which workability loss is minimized for concretes containing the superplasticizer, both at the normal and at the elevated temperature. In addition, short- and long-term strengths are improved.