Abstract
Concrete undergoes shrinkage regardless of the influence of external forces. The deformation of concrete is crucial for the structural stability of high-rise and large-scale buildings. In this study, the shrinkage and compressive creep of 70–90 MPa high-strength concrete used in high-rise buildings were evaluated based on the curing conditions (sealed/unsealed), and the existing prediction models were examined. It was observed that the curing condition does not significantly affect the mechanical properties of high-strength concrete, but the use of limestone coarse aggregate increases the elastic modulus when compared to granite coarse aggregate. The autogenous shrinkage of high-strength concrete is greater than that of normal-strength concrete owing to self-desiccation, resulting in a large variation from the value predicted by the model. The drying shrinkage was observed to be similar to that predicted by the model. Compressive creep was affected by the curing conditions, compressive strength, loading level, and loading age. The compressive creep of high-strength concrete varied significantly from the prediction results of ACI 209; ACI 209 was modified based on the measured values. The shrinkage and compressive creep characteristics of high-strength concrete must be reflected to predict the deformation of an actual structure exposed to various conditions.
Highlights
IntroductionIt is a nonhomogeneous material owing to its internal pores, which are absent in homogeneous materials such as iron
Concrete is a composite composed of cement, aggregate, water, and admixture
The compressive strength and elastic modulus of high-strength concrete were evaluwhere ated to beultimate approximately 2% higher under the sealed condition than under the unυu 0: modified creep coefficient; sealed condition based on the curing conditions
Summary
It is a nonhomogeneous material owing to its internal pores, which are absent in homogeneous materials such as iron. It may exhibit various deformation characteristics when compared to typical homogeneous materials. It undergoes various deformations based on the presence or absence of an external force. Compressive creep is a physical phenomenon in which the deformation of a member under a continuous load increases over time even without the application of additional loads following the elastic deformation caused by loading; it is typically observed in the presence of an external force [1,2,3,4,5,6]
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