DEVELOPMENT OF A PRACTICAL TENSILE CREEP MODEL BASED ON SIMPLE EXPERIMENTS

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A method to obtain tensile creep coefficient of concrete with W/C=0.5 was investigated, based on measured reinforcement strains in centrically reinforced concrete prisms due to drying and measured drying shrinkage strains in the companion prisms without restraint, in which nominal reinforcement ratios were in 6 levels from 0.1% to 2.4%. As a result, incremental creep coefficients at different loaded ages were obtained andhowever, the dependence of values of creep coefficient on loading age was not shown. Related to this, a method to evaluate creep coefficients of concrete in a prestressed concrete beam was developed by measuring stains in prestressing tendons and shrinkage strain of the companion specimen without prestressing tendons and the method was verified to be valid.