Open AccessDOI
Design Provisions for Shrinkage and Creep of ConcreteDesign Provisions for Shrinkage and Creep of ConcreteDesign Provisions for Shrinkage and Creep of Concrete
N. J. Gardner
- Vol. 194, pp 101-134
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The article was published on 2000-05-01 and is currently open access. It has received 10 citations till now. The article focuses on the topics: Shrinkage & Creep.read more
Citations
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Journal ArticleDOI
Experimental and numerical study of the relative humidity effect on drying shrinkage and cracking of self-consolidating concrete
TL;DR: In this paper, free and restrained shrinkages were measured on self-consolidating concrete for three different relative humidities: 30, 50% and 70%. A maximum value of drying shrinkage was observed for the intermediate relative humidity.
Dissertation
Investigation of Long-Term Prestress Losses in Pretensioned High Performance Concrete Girders
Abstract: Effective determination of long-term prestress losses is important in the design of prestressed concrete bridges. Over-predicting prestress losses results in an overly conservative design for service load stresses, and under-predicting prestress losses, can result in cracking at service loads. Creep and shrinkage produce the most significant time-dependent effect on prestress losses, and research has shown that high performance and high strength concretes (HPC and HSC) exhibit less creep and shrinkage than conventional concrete. For this reason, the majority of traditional creep and shrinkage models and methods for estimating prestress losses, over-predict the prestress losses of HPC and HSC girders. Nine HPC girders, with design compressive strengths ranging from 8,000 psi to 10,000 psi, and three 8,000 psi lightweight HPC (HPLWC) girders were instrumented to determine the changes in strain and prestress losses. Several creep and shrinkage models were used to model the instrumented girders. For the HPLWC, each model over-predicted the long-term strains, and the Shams and Kahn model was the best predictor of the measured strains. For the normal weight HPC, the models under-estimated the measured strains at early ages and over-estimated the measured strains at later ages, and the B3 model was the best-predictor of the measured strains. The PCI-BDM model was the most consistent model across all of the instrumented
Journal ArticleDOI
Coupled Creep-Damage-Plasticity Model for Concrete under Long-Term Loading
TL;DR: In this paper, a damage-plasticity model was extended to account for the effects of simultaneously occurring stiffness degradation, residual deformation, and creep, assuming the additivity of small strains.
Journal ArticleDOI
Shape effect on drying behavior of cement-based materials: Mechanisms and numerical analysis
TL;DR: In this paper, the authors used nonlinear moisture diffusion analysis to determine the shape effect on the shrinkage rate of cylinders and showed that the mass loss and drying shrinkage of cylinders showed higher rate and ultimate values than the prisms, for the same effective cross section thickness.
Journal ArticleDOI
Time-Dependent Strains in Axially Loaded Reinforced Concrete Columns
TL;DR: In this article, an exact method for estimating the time-dependent strain in reinforced concrete (RC) members is presented, which can be used to estimate the time dependence of reinforced concrete members.
References
More filters
Journal ArticleDOI
Experimental and numerical study of the relative humidity effect on drying shrinkage and cracking of self-consolidating concrete
TL;DR: In this paper, free and restrained shrinkages were measured on self-consolidating concrete for three different relative humidities: 30, 50% and 70%. A maximum value of drying shrinkage was observed for the intermediate relative humidity.
Dissertation
Investigation of Long-Term Prestress Losses in Pretensioned High Performance Concrete Girders
Abstract: Effective determination of long-term prestress losses is important in the design of prestressed concrete bridges. Over-predicting prestress losses results in an overly conservative design for service load stresses, and under-predicting prestress losses, can result in cracking at service loads. Creep and shrinkage produce the most significant time-dependent effect on prestress losses, and research has shown that high performance and high strength concretes (HPC and HSC) exhibit less creep and shrinkage than conventional concrete. For this reason, the majority of traditional creep and shrinkage models and methods for estimating prestress losses, over-predict the prestress losses of HPC and HSC girders. Nine HPC girders, with design compressive strengths ranging from 8,000 psi to 10,000 psi, and three 8,000 psi lightweight HPC (HPLWC) girders were instrumented to determine the changes in strain and prestress losses. Several creep and shrinkage models were used to model the instrumented girders. For the HPLWC, each model over-predicted the long-term strains, and the Shams and Kahn model was the best predictor of the measured strains. For the normal weight HPC, the models under-estimated the measured strains at early ages and over-estimated the measured strains at later ages, and the B3 model was the best-predictor of the measured strains. The PCI-BDM model was the most consistent model across all of the instrumented
Journal ArticleDOI
Coupled Creep-Damage-Plasticity Model for Concrete under Long-Term Loading
TL;DR: In this paper, a damage-plasticity model was extended to account for the effects of simultaneously occurring stiffness degradation, residual deformation, and creep, assuming the additivity of small strains.
Journal ArticleDOI
Shape effect on drying behavior of cement-based materials: Mechanisms and numerical analysis
TL;DR: In this paper, the authors used nonlinear moisture diffusion analysis to determine the shape effect on the shrinkage rate of cylinders and showed that the mass loss and drying shrinkage of cylinders showed higher rate and ultimate values than the prisms, for the same effective cross section thickness.
Journal ArticleDOI
Time-Dependent Strains in Axially Loaded Reinforced Concrete Columns
TL;DR: In this article, an exact method for estimating the time-dependent strain in reinforced concrete (RC) members is presented, which can be used to estimate the time dependence of reinforced concrete members.