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Drying Shrinkage Updated Model for Hardened Chilean Concretes

Chilean research on Chilean concrete shrinkage behavior is presented. There was analysis of the effects of admixture type, nominal aggregate maximum size, aggregate and cement type, concrete slump, and volume surface ratio. Studies involved 492 test specimens and 82 different concrete mixtures with a mean cylinder compressive strength at 28 days of between 25 and 40 MPa. Drying shrinkage strain evolution was measured up to 1,350 days of drying. There is discussion of six different prediction models' applicabilities in light of measured shrinkage strains. Chilean concretes' measured results were compared with drying shrinkage prediction with Sakata 1993 and 2001 and ACI-209, B3, CEB-MC90, and GL2000 models. Current shrinkage models were shown by results to not be adequate for tested Chilean concrete drying shrinkage prediction. The best result found for Chilean concrete condition, however, was obtained from Sakata models with a coefficient variation under 30% when all concrete testing data was considered in the analysis. An appropriate model updating methodology was developed, based on measured and predicted shrinkage values' comparison and current proposed model calibration. An updated model is proposed as a result for local conditions used in the design phase.