Abstract
Autogenous shrinkage, significant primarily in concretes with a low water-cementitious material ratio (w/cm), has received more attention in recent years due to increasing use of high-performance concretes (HPCs). In this study, autogenous shrinkage was quantified in both unrestrained and restrained concrete. The specimens were sealed and kept at a constant isothermal temperature of 20°C (68°F) to prevent deformation due to temperature change or moisture loss. Various materials were evaluated to compare their effectiveness in reducing autogenous deformation and stress development, including saturated lightweight aggregates, shrinkage-reducing admixtures, and a shrinkage-compensating additive (based on calcium sulfoaluminate). The data obtained also provides insight into mechanisms behind autogenous shrinkage and the resulting stress development in restrained members and quantify effects of methods used to reduce autogenous shrinkage and resultant stresses.
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