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Volume change of concrete resulting from structural and environmental factors is an acceptable phenomenon. In the majority of cases this volume change, or shrinkage, is assumed to begin at the time of loading or drying. In reality, a volume change commences immediately after the cement and water come in contact during concrete mixing. These early age volume changes are typically ignored in design of concrete structures since their magnitude can be much less than shrinkage resulting from drying. But even when the concrete curing conditions are ideal, the first day shrinkage can significantly contribute to the ultimate shrinkage and thus the cracking risk. The goal of this work was to establish a clearer understanding of the mechanisms causing autogenous shrinkage of concrete during the early ages. Autogenous shrinkage is a volume change resulting when there is no moisture transfer to the surrounding environment. It is most prominent in high strength, or high performance concrete where the water-to-cement ratio is under approximately 0.42. Autogenous shrinkage at later ages has been well documented and explained by self-desiccation behavior but the presence of autogenous shrinkage during the first day of concrete hardening has not been theoretically explained.
Volume change of concrete resulting from structural and environmental factors is an acceptable phenomenon. In the majority of cases this volume change, or shrinkage, is assumed to begin at the time of loading or drying. In reality, a volume change commences immediately after the cement and water come in contact during concrete mixing. These early age volume changes are typically ignored in design of concrete structures since their magnitude can be much less than shrinkage resulting from drying. But even when the concrete curing conditions are ideal, the first day shrinkage can significantly contribute to the ultimate shrinkage and thus the cracking risk. The goal of this work was to establish a clearer understanding of the mechanisms causing autogenous shrinkage of concrete during the early ages. Autogenous shrinkage is a volume change resulting when there is no moisture transfer to the surrounding environment. It is most prominent in high strength, or high performance concrete where the water-to-cement ratio is under approximately 0.42. Autogenous shrinkage at later ages has been well documented and explained by self-desiccation behavior but the presence of autogenous shrinkage during the first day of concrete hardening has not been theoretically explained.
Early Age Autogenous Shrinkage of Concrete
E. E. Holt (author)
2001
204 pages
Report
No indication
English
Construction Equipment, Materials, & Supplies , Highway Engineering , Concrete structures , Shrinkage , Bridge decks , Measuring methods , Cracking , Drying , Test methods , Bridge surfaces , Volume changes , Concretes , Cements , Mortars , Durability , Deterioration , Infrastructure , Construction , Foreign technology
Early age autogenous shrinkage of concrete
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